Dr. A.P. Uthirakumar
Associate Professor and Head of Nanoscience Centre for Optoelectronics and Energy Devices [Nano-COED],
Department of Chemistry
Sona College of Technology, Salem – 636 005. India
Email: uthirakumar@sonatech.ac.in, uthirakumar@gmail.com
ACADEMIC QUALIFICATION
| University Degree |
Subject |
University |
Year |
| Ph.D. |
Chemical Engineering –“Polymer/Clay Nanocomposites” |
Chonbuk National University, South Korea |
2005 |
| M.Sc |
Chemistry |
S.V.N College, Madurai Kamaraj University |
1995 |
| B.Sc |
Chemistry (Physics & Zoology as allied subjects) |
S.V.N College, Madurai Kamaraj University |
1993 |
Personal Data
| Date of Birth |
: |
20th June 1972 |
| Sex |
: |
Male |
| Nationality |
: |
Indian |
| Marital Status |
: |
Married |
DETAILS OF PREVIOUS AND PRESENT EMPLOYMENT
| Position held |
Organization |
Month and year of Entry |
Month and year of Completion |
Subject of Research |
| Junior executive(Chemist) |
Orchid Chemicals and Pharmaceuticals Ltd,Chennai, India |
Feb 1996 |
May 1999 |
Process development of cephalosporin drugs |
| Assistant Manager |
Aurobindo Pharmaceutical Ltd, Hyderabad, India |
July 1999 |
February 2002 |
Research and Process development of Antibiotic drugs |
| Post Doctoral Researcher (Supervisor: Prof. Youn-Sik Lee) |
Department of Environmental and Chemical Engineering , Chonbuk National University |
May 2005 |
April 2006 |
Development of yellow light emitting polymers for white light emitting diodes |
| Post Doctoral Researcher (Supervisor: Prof. Chang-Hee Hong) |
Semiconductor Physics Research Center, Chonbuk National University |
May 2006 |
November 2008 |
Synthesis of nanomaterials (ZnO, GaN, InN and InGaN for fabrication of light emitting diodes and solar cells |
| Researcher Professor (Supervisor: Prof. Chang-Hee Hong) |
School of Semiconductor and Chemical Technology, Semiconductor Physics Research Center, Chonbuk National University |
December 2008 |
June 2010 |
Surface functionalization of GaN based light emitting diodes (LEDs) by using ZnO and Ag nanomaterials to improve the light extraction efficiency of the LEDs |
| Assistant Professor |
Department of Chemistry, Sona College of Technology, Salem, Tamilnadu, India |
August 2010 |
November 2011 |
Design and development of specifically designed nano-structured materials for the application of Solar Cells and LEDs |
| Associate Professor |
Department of Chemistry, Sona College of Technology,Salem, Tamilnadu, India |
December 2011 |
Till date |
Design and development of specifically designed nano-structured materials and Natural dyes for Solar Cells and LEDs Development of Nano-techniques to remove textile organic dyes from the industrial waste water |
EXPERIENCE
- Teaching Experience (at Sona college of Technology) - 2 Years and 7 Months
- In the field of Synthetic Organic Chemistry – 6 years
- In the field of Nano technology – 5 years and 1 month
- Post-doctoral Experience (in South Korea) – 3 years and 6 months
- Research Professor Experience (in South Korea) – 1 year and 7 months
Awards/Fellowships
- Received “University Seventh Rank” in M.Sc among 22 colleges under Madurai Kamaraj University (1995).
- Awarded “Brain Korea 21 Fellowship” (BK-21) throughout my PhD course by Korean Government (2003).
- Awarded “University Post-doctoral Fellowship” by Chonbuk National University, South Korea (2005).
- Awarded “Korean Research Foundation Fellowship” (KRF) by Korean Government, South Korea (2006).
- Received a “Best poster award” in GJ-NST 2007 international conference on Nano Science and Nano Technology in Kwangju, South Korea (2007).
- Included my biography in the 25th Anniversary Edition of Who's Who in the World is an achievement worth cherishing and commemorating (2008).
Membership in Scientific Organization
-
Member of Korean Physical Society
- Member of Korean Chemical Societ
- Signed MoU with Chonbuk National University, Jeonju, South Korea for graphene based research
Honors Recived
- Editorial board member in ISRN-Nanomaterials journal, http://www.isrn.com/43253967/.
- Editorial member in Journal of Chemical Engineering and Material Science, -Academic journals.
- Editorial member in Journal of Chemistry and Chemical Engineering, ISSN 1934-7375, David Publishing Company, Chicago, IL, USA
- Editorial member in International Journal of Chemical Science Review and Letters (CSRL), http://www.chesci.com.
- Editorial member in International Journal of Polymer Science, - Hindawi group.
- Member in American Nano Society, http://members.nanosociety.us/uthirakumar
Field of Specialization
- Development of Hybrid and Nanomaterials
- Material science and Nanomaterials Research
- Solution Chemistry Approach for Nanomaterials Synthesis
- Surface Functionalization for the Light Conversion in LEDs
- Metal Oxide Nanomaterials and Natural organic dyes for Dye Sensitized Solar cell Applications
- Surface Texturing on LEDs to improve the light extraction efficiency using Nanomaterials
Technical Skills
- Synthesis of characterization of Polymers and Nanomaterials
- Ability to perform wild range of Nanomaterials reactions
- Fabrication of dye sensitized solar cells
- Capability to modify the LED structures with embedded nanomaterials
- Electrical and Optical characterization of LED and Solar cells
Hands on Sophisticated Instruments
- X-ray Diffraction (Rigaku, Japan)
- Scanning Electron Microscopy (S-4300SE, Hitachi)
- Chemical Vapor Deposition system (Optowall, South Korea)
- Differential Scanning Calorimeter (TA instruments)
- Thermo Gravimetric Analyzer (TA instruments)
- Fourier Transform Infra Red Spectrophotometer (Perkin Elmer & Nicolet)
- Ultraviolet-Visible Spectrophotometer (Perkin Elmer)
- Photoluminescence spectrophotometer (LS55, Perkin Elmer)
- High Performance Liquid Chromatography-Mass analyzer (Shimadzu, waters)
- Room Temperature Micro Raman Spectrophotometer (Ranishaw, South Korea)
- Transmission Electron Microscopy (TEM, JEOL-2010)
Experience in characterization technique
- X-ray Diffraction
- Scanning Electron Microscopy
- Nuclear Magnetic Resonance
- Fourier Transform Infra Red Spectroscopy
- Chemical Vapor Deposition
- Ultraviolet-Visible Spectroscopy
- Photoluminescence Spectroscopy
- Mass Spectrometry
- Tranmission Electron Microscopy
- High-speed LED tester with Keithley current source
- Differential Scanning Calorimetery
- Thermo Gravimetry
- RAMAN spectroscopy
- Polarimetry
- Elemental analysis
- Atomic Force Microscopy
- I-V and L-I-V characterization
- Spin coating technique
Collaborators:
Optoelectronic Lab, School of Semiconductor and Chemical Technology, SPRC, Chonbuk National University, Jeonju, South Korea
Scientific contributions
| Papers published in International Journals |
: |
47 |
| Papers published in National Journals |
: |
--- |
| Papers Published in proceedings of International conference/Technical meeting |
: |
29 |
| Papers presented/accepted in International conference |
: |
4 |
| Papers presented/accepted in National conference |
: |
--- |
| National/International school/ workshop/conferences attended |
: |
33 |
List of papers published in international Journals
- Periyayya Uthirakumar, Beo Deul Ryu, Ji Hye Kang, Mi So Lee and Chang-Hee Hong, “Natural Light Source Assisted Synthesis of Self-decorated Ag/TiO2 Nanoparticles for Enhanced Photocatalytic Degradation of Fluorescein” Current Nanoscience 8 (6) (December 2012), 896-901. [SCI impact factor (2011) =1.776].
- Joo Jin, Beo Deul Ryu, Min Han, R. Saravana Kumar, Periyayya Uthirakumar, Hyun Kyu Kim, Yang Jong Han, Kyu Han Lee, and Chang-Hee Hong, “Beam Divergence and Thermal Transient Characteristics of InGaN/GaN Light Emitting Diodes with Rear Side Grown ZnO Nanorods” Japanese Journal of Applied Physics, 51 (2012) (24th September 2012), 102101-102104. [SCI impact factor (2011) =1.058].
- J.H. Kang, Periyayya Uthirakumar, Y.S. Katharria, J.H. Ryu, H.K. Kim, H.Y. Kim, N. Han, Y.J. Park, Y.S. Beak, S.M. Kim, C.-H. Hong, “Coalescence driven size-controlled synthesis of ITO nanospheres”, Applied Surface Science 258 (22) (1 September 2012) 8996-9004. [SCI impact factor (2011) =2.103].
- Periyayya Uthirakumar, Beo Deul Ryu, Ji Hye Kang, and Chang-Hee Hong. “Impact of Nano-texturing in GaN-based Light Emitting Diodes by Self-assembled Silver Microspheres as etch mask”, Current Nanoscience 7 (6) (December 2011), 1000-1003. [SCI impact factor (2011) =1.776].
- Periyayya Uthirakumar, Ji Hye Kang, Jae Hyoung Ryu, and Chang-Hee Hong “Synthesis and Improved Luminescence Properties of OLED/ZnO Hybrid Materials”, vacuum- 86 (October - 2011) 254-260. [SCI impact factor (2011) =1.317].
- Ji Hye Kang, Jae Hyoung Ryu, Hyun Kyu Kim, Hee Yun Kim, Nam Han, Mi So Lee, Young Jae Park, Periyayya Uthirakumar, Volodymyr V. Lysak, Chang-Hee Hong, “Enhancement of light output power in GaN-based light-emitting diodes using indium tin oxide films with nanoporous structures” Thin Solid Films, 520 (1), (October 2011), 437-441.[SCI impact factor (2011) = 1.890].
- Periyayya Uthirakumar, Ji Hye Kang, S. Senthilarasu, Chang-Hee Hong, “The different types of ZnO materials on the performance of dye-sensitized solar” Physica E: Low-dimensional Systems and Nanostructures, 43 (9) (July 2011) 1746-1750, [SCI impact factor (2011) =1.532].
- Periyayya Uthirakumar, Ji Hye Kang, Beo Deul Ryu, and Chang-Hee Hong. “Improved Light Extraction Efficiency of GaN-based Light Emitting Diodes using One and Two Interfaces of ITO/ZnO Layer Texturing”, Materials Science in Semiconductor Processing, 13 (5-6) (December 2010), pp. 329-332. [SCI impact factor (2011) = 0.753].
- Hyun Kyu Kim, Hyung Gu Kim, Kim, H.Y., Ryu, J.H., Ji Hye Kang, Nam Han, Kwon, B.J., Periyayya Uthirakumar, Han, M.S., Kang, S.H., Chang-Hee Hong, “Light output power enhancement of GaN-based light emitting diodes with periodic deflector embedded on the wet etch patterned sapphire substrate” Japanese Journal of Applied Physics, 50 (4 PART 1), (April 2011) 042102. [SCI impact factor (2011) =1.058].
- Beo Deul Ryu, Periyayya Uthirakumar, Ji Hye Kang, Bong Jun Kwon, S. Chandramohan, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Hyung Gu Kim, and Chang-Hee Hong, “Enhanced light output power of GaN-based light-emitting diodes by nano-rough indium tin oxide film using ZnO nanoparticles” Journal of Applied Physics, 109 (May 2011), 093116-093120. [Times Cited: 1] [SCI impact factor (2011) =2.168].
[News archived in semiconductor-today magazine: http://www.semiconductor-today.com/news_items/2011/MAY/CNU_300511.html].
- Ji Hye Kang, Jae Ryu Park, Hyun Kyu Kim, Hee Yun Kim, Nam Han, Young Jae Park, Periyayya Uthirakumar, and Chang-Hee Hong, “Comparison of various surface textured layer in InGaN LEDs for high light extraction efficiency” Optics Express, 19 (4) (February 2011) 3637-3646. [Times Cited: 3] [SCI impact factor (2011) =3.587].
- S. Chandramohan, Beo Deul Ryu, Periyayya Uthirakumar, Ji Hye Kang, Hyun Kyu Kim, Hyung Gu Kim, Chang-Hee Hong “Tuning the spectrometric properties of white light by surface plasmon effect using Ag nanoparticles in a colour converting light-emitting diode” Solid-State Electronics, 57 (1) (March 2011), 90-92. [SCI impact factor (2011) =1.397].
- Mi So Lee, Hyung Gu Kim, Ji Hye Kang, Jae Hyoung Ryu, Hyun Kyu Kim, Hee Yun Kim, Periyayya Uthirakumar, and Chang-Hee Hong “Enhancement of light output power and modification of beam profile in InGaN/GaN light emitting diodes with micro polygon column shaped transparent” Japanese Journal of Applied Physics, 49 (11) (November 2010) 112101. [SCI impact factor (2011) =1.058].
- Hyung Gu Kim, Hyun Kyu Kim, Hee Yun Kim, Hyun Jeong, S. Chandramohan, Periyayya Uthirakumar, Mun Seok Jeong, Jeong-Sik Lee, Eun-Kyung Suh and Chang-Hee Hong, “Enhanced air-cavity effect of periodically oriented embedded air protrusions for high-efficiency InGaN/GaN light-emitting diodes” Optics Letters, 35 (18) (August 2010) 3012-3014. [Times Cited: 4] [SCI impact factor (2011) =3.399].
- Periyayya Uthirakumar, Ji Hye Kang, Hyung Gu Kim, and Chang-Hee Hong. “Impact of Layer Thickness and Light Transmission of ZnO Nanomaterials on GaN-Based Light Emitting Diodes”, Vacuum, 85 (August 2010) 198-202. Top 25 (15th) Hottest Articles in Physics and Astronomy-Vacuum in Science direct: October - December 2010, [Times Cited: 2] [SCI impact factor (2011) = 1.317].
- P.Michael S.L. Shanthi, R.V. Mangalaraja, Periyayya Uthirakumar, S. Velmathi, T. Balasubramanian, M. Ashok “Synthesis and characterization of porous shell-like nano hydroxyapatite using cetrimide as template”, Journal of Colloid and Interface Science, 350 (1) (October 2010) 39-43. [Times Cited: 5] [SCI impact factor (2011) =3.070].
- Jae Hyoung Ryu, S. Chandramohan, Hyung Gu Kim, Hee Yun Kim, Hyun Kyu Kim, Nam Han, Ji Hye Kang, Periyayya Uthirakumar, Chang -Hee Hong, Hyun Kyong Cho, Hyun Don Song, Ho-Ki Kwon, “Effect of Ridge growth on water bowing and light extraction efficiency of vertical GaN-based light emitting diodes”, Japanese Journal of Applied Physics, 49 (July 2010) 072102-05. [SCI impact factor (2011) =1.058].
- Hyun Kyu Kim, Hyung Gu Kim, Hee Yun Kim, Jae Hyoung Ryu, Ji Hye Kang, Nam Han, Periyayya Uthirakumar and Chang-Hee Hong: “Enhanced Light Output Power of GaN-based Light Emitting Diodes with Overcut Sideholes formatted by Wet Etching”, Solid State Electronics, 54 (5) (May 2010) 575-578. [Times Cited: 2] [SCI impact factor (2011) =1.397].
- Periyayya Uthirakumar, Ji Hye Kang, Beo Deul Ryu, Hyung Gu Kim, Hyun Kyu Kim, and Chang-Hee Hong. “Nanoscale ITO/ZnO Layer-Texturing for High-Efficiency InGaN/GaN Light Emitting Diodes”, Journal of Materials Science and Engineering B, 166 (February 2010) 230-234, [Times Cited: 4] [SCI impact factor (2011) =1.518].
- Hyung Gu Kim, Hee Yun Kim, Hyun Kyu Kim, Jae Hyoung Ryu, Ji Hye Kang, Nam Han, Periyayya Uthirakumar and Chang-Hee Hong: “Impact of two-floor air prism arrays as an embedded reflector for enhancing the output power of InGaN/GaN light emitting diodes”, Applied Physics Letters, 95 (December 2009) 221110-221113. [Times Cited: 12] [SCI impact factor (2011) = 3.844].
- Hyung Gu Kim, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Ji hae Kang, Nam Han, Periyayya Uthirakumar and Chang-Hee Hong: “Enhanced Light Output Power of InGaN/GaN Light Emitting Diodes with Embedded Air Prisms”, Electrochemical and Solid-State Letters, 13 (2) (January 2010) H42-H44. [Times Cited: 10] [SCI impact factor (2011) =1.995].
- Ji Hye Kang, Hyung Gu Kim, Jae Ryu Park, Hyun Kyu Kim, Hee Yun Kim, Mi So Lee, Young Jae Park, Periyayya Uthirakumar, and Chang-Hee Hong, “Enhancement of light output power in InGaN/GaN LEDs with nanoroughed hemispherical Indium Tin Oxide transparent ohmic contacts”, Electrochemical and Solid-State Letters,13 (2) (January 2010) D1-D3. [Times Cited: 6] [SCI impact factor (2011) =1.995].
- Periyayya Uthirakumar, Hyung Gu Kim, and Chang-Hee Hong “Zinc Oxide Nanostructures Derived from a Simple Solution Method for Solar Cells and LEDs”, Chemical Engineering Journal, 155 (December 2009) 910-915. [Times Cited: 5, SCI impact factor (2011)= 3.461]
- Ji Hye Kang, Hyung Gu Kim, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Periyayya Uthirakumar, Nam Han, and Chang-Hee Hong, “Improvement of light output power in InGaN/GaN Light-Emitting Diodes with a nanotextured GaN surface using Indium Tin Oxide nanospheres”, Japanese Journal of Applied Physics, 48 (October 2009) 102104-102108. [Times Cited: 9, ] [SCI impact factor (2011) =1.058].
- Periyayya Uthirakumar and Chang-Hee Hong, “Effect of Annealing Temperature and pH on the Morphology and Optical Properties of Highly Dispersible ZnO nanoparticles”, Material Characterization, 60(11) (November 2009) 1305-1310, [Times Cited: 2] [SCI impact factor (2011) =1.572].
- Periyayya Uthirakumar, H-Nam, Seung Hee Woo, Eun-Kyung Suh and Chang-Hee Hong “A Catalyst Free Approach to Prepare Nano to Microstructures of GaN from a Single Molecular Complex Precursor”, Journal of Korean Physical Society, 55 (July 2009) 59-63. [SCI impact factor (2011) =0.447].
- yung Gu Kim, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Ji hye Kang, Nam Han, Periyayya Uthirakumar, Dong Hyun Yu, and Chang-Hee Hong “InGaN/GaN Light-Emitting Diodes with Overcut-Shaped Periodic Microstructures Formed by Wet Etching Process” Electrochemical and Solid-State Letters, 12 (8) (May 2009) H299-H301. [Times Cited: 3] [SCI impact factor (2011) =1.995].
- Seung Hun Eom, S. Senthilarasu, Periyayya Uthirakumar, Sung Cheol Yoon, Jongsun Lim, Changjin Lee, Hyun Seok Lim, J. Lee, Soo-Hyoung Lee “ Polymer solar cells based on inkjet-printed PEDOT:PSS layer”, Organic Electronics, 10 (3) (May 2009) 536-542. [Times Cited: 31] [SCI impact factor (2011) = 4.047].
- G. Gnana Kumar, Periyayya Uthirakumar, Kee Suk Nahm and R. Nimma Elizabeth: “Fabrication and electro chemical properties of poly vinyl alcohol/para toluene sulfonic acid membranes for the applications of DMFC”, Solid State Ionics, 180 (2-3) (March 2009) 282-287. [Times Cited: 2] [SCI impact factor (2011) =2.646].
- Periyayya Uthirakumar, H-Nam, Seung Hee Woo, Eun-Kyung Suh and Chang-Hee Hong “Synthesis and Optical Properties of Sword-like GaN nanorods clusters”, Current Applied Physics, 9(1)Supplement 1 (January 2009) S114-S117. [Times Cited: 3] [SCI impact factor (2011) =1.900].
- Periyayya Uthirakumar, Eun-Kyung Suh, and Chang-Hee Hong: “The Impact of ZnO interlayer on the Growth and Morphology of Broom-like Single Crystalline GaN”, Journal of Nanoscience and Nanotechnology, 8 (October 2008) 5351–5355. [Times Cited: 1] [SCI impact factor (2011) =1.557].
- Periyayya Uthirakumar, Eun-Kyung Suh, and Chang-Hee Hong: “Growth, Morphology and Optical properties of Tris(8-hydroxyquinoline)aluminum/Zinc oxide Hybrid Nanowires”, Journal of Luminescence, 128 (10) (October 2008) 1629-1634. [Times Cited: 3, SCI impact factor (2011) =2.102].
- Seung Hun Eom, S. Senthilarasu, Periyayya Uthirakumar, Chang-Hee Hong, Youn-Sik Lee, Jongsun Lim, Sung Cheol Yoon, Changjin Lee and Soo-Hyoung Lee: “Preparation and characterization of nano-scale ZnO as a buffer layer for inkjet printing of silver cathode in polymer solar cells”, Solar Energy Materials and Solar Cells, 92 (5)(May 2008) 564-570.Top 25 (4th) Hottest Articles in Science Direct: January - March 2008 [Times Cited: 17] [SCI impact factor (2011) = 4.542].
- Periyayya Uthirakumar, Youn-Sik Lee, Eun-Kyung Suh, and Chang-Hee Hong: “Hybrid Fluorescent Polymer-Zinc oxide Nanoparticles: Improved Efficiency for Luminescence Conversion LED”, Journal of Luminescence, 128 (3) (March 2008) 287-296. Top 25 (1st) Hottest Articles in Physics and Astronomy-Journal of Luminescence in Science direct: January - March 2008 [Times Cited: 18, SCI impact factor (2011) =2.102].
- Periyayya Uthirakumar, Eun-Kyung Suh, and Chang-Hee Hong: “Effect of Zinc oxide Incorporation on the Morphology of Tris(8-hydroxyquinoline)aluminum / Zinc oxide Hybrid Nanomaterials”, Thin solid films, 516 (21)(September 2008, 7299-7305. [SCI impact factor (2011) = 1.890].
- Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong and Youn-Sik Lee: “Preparation of exfoliated high-impact polystyrene/MMT nanocomposites via in situ polymerization under controlling viscosity of the reaction medium”, Polymer Composites, 29 (2) (February 2008), 142-148. [Times Cited: 4] [SCI impact factor (2011) = 1.231].
- B. Karunagaran, Periyayya Uthirakumar, S.J. Chung, S. Velumani and E.-K. Suh: “TiO2 thin film gas sensor for monitoring ammonia”, Materials Characterization, 58 (8-9) (Aug-Sep 2007), 680-684. Top 25 (1st) Hottest Articles in Materials science-Materials Characterization in Science direct: July - September 2007. [Times Cited: 42] [SCI impact factor (2011) =1.572].
- Periyayya Uthirakumar, Chang-Hee Hong, Eun-Kyung Suh, and Youn-Sik Lee: “A Yellow Light-Emitting Polymer Bearing Fluorescein Dye Units: Photophysical Property and Application as Luminescence Converter of a Hybrid LED”, Reactive and functional polymer, 67 (4) (April 2007) 341-347. [Times Cited: 7] [SCI impact factor (2011) = 2.479].
- Periyayya Uthirakumar, Youn-Sik Lee, Eun-Kyung Suh, and Chang-Hee Hong: “Nano crystalline ZnO particles: Low temperature solution approach from a single molecular precursor”, Journal of Crystal Growth, 304 (1) (June 2007), 150-157.Top 25 (3rd ) Hottest Articles in Science direct: April - June 2007 [Times Cited: 13] [SCI impact factor (2011) =1.726].
- Periyayya Uthirakumar, Chang-Hee Hong, Eun-Kyung Suh, and Youn-Sik Lee: “Novel Fluorescent Polymer-Zinc oxide hybrids for Bright and Efficient White Light Emitting Diodes”, Chemistry of Materials, 18 (October 2006) 4990-4992. Most-Accessed Articles: October-December, 2006. [Times Cited: 12] [SCI impact factor (2011) = 7.286].
- Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong and Youn-Sik Lee: “Preparation and Photophysical Properties of Organic Fluorescent Polymer and their Nanoparticles”, Journal of Applied Polymer Science, 102 (December 2006) 5344-5350. [Times Cited: 7] [SCI impact factor (2011) =1.289].
- Periyayya Uthirakumar, Youn-Sik Lee, Eun-Kyung Suh, and Chang-Hee Hong: “ZnO Nanoballs Synthesized from a Single Molecular Precursor via Non-Hydrolytic Solution Route Without Assistance of Base, Surfactant, and Template etc”, Physics Letters A, 359 (3) (November 2006) 223-226. [Times Cited: 15] [SCI impact factor (2011) = 1.632].
- Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong and Youn-Sik Lee: “Synthesis and Characterization of Polyesters Containing Fluorescein Dye Units”, Polymer, 46 (June 2005) 4640-4646. [Times Cited: 13] [SCI impact factor (2011) = 3.438].
- Periyayya Uthirakumar, Yoon Bong Hahn, Kee Suk Nahm, and Youn-Sik Lee: “Exfoliated High Impact Polystyrene/MMT Nanocomposites using Anchored Cationic Radical Initiator-MMT Hybrid”, European Polymer Journal, 41 (July 2005) 1582-1588. [Times Cited: 27, SCI impact factor (2011)= 2.737]
- Periyayya Uthirakumar, Song Ming Ki, Chang Woon Nah, and Youn-Sik Lee: “Preparation and Characterization of Exfoliated Polystyrene/Clay Nanocomposites using a Cationic Radical Initiator-MMT Hybrid”, European Polymer Journal, 41(2) (February 2005) 211-217. [Times Cited: 35, SCI impact factor (2011)=2. 2.737]
- Periyayya Uthirakumar, Kee Suk Nahm, Yoon Bong Hahn, and Youn-Sik Lee: “Preparation of Polystyrene/Montmorillonite Nanocomposites using a New Radical Initiator-Montmorillonite Hybrid via in-situ Intercalative Polymerization”, European Polymer Journal, 40(11) (November 2004) 2437-2444. Top 25 (6th) Hottest Articles in Chemistry-European Polymer Journal in Science direct: October - December 2004. [Times Cited: 53, SCI impact factor (2011)=2.737]
- Periyayya Uthirakumar, Cheol-Ju Kim, Kee Suk Nahm, Yoon Bong Hahn, and Youn-Sik Lee: “Preparation and Characterization of New Difunctional Cationic Radical Initiator-Montmorillonite Hybrids”, Colloids and Surfaces, A: Physiochem and Eng. Aspects, 247(1-3) (October 2004) 69-75. [Times Cited: 15] [SCI impact factor (2011) = 2.236].
Book Chapters
Book Title: Polymer Nanocomposites: Advances in Filler Surface Modification Techniques
Editor : Dr. Vikas Mittal, Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Switzerland.
Title: Polymer Nanocomposites: Advances in Filler Surface Modification Techniques
Editor : Dr. Vikas Mittal, Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Switzerland.
Chapter title: “Role of monocationic and bicationic initiators on the grafting of polymer chains ‘from’ the clay surface”
Page: pp 61-90.
Series: Nanotechnology Science and Technology
Publisher: Nova Science Publishers, New York, USA.
Pub. Date: 2009, 4th quarter
ISBN: 978-1-60876-125-8
02. Book Title: Polymer Initiators
Editor : Whitney J. Ackrine.
Chapter title: “Role of monocationic and bicationic initiators on the grafting of polymer chains from the clay surface”
Page: pp 247-275
Series: Biochemistry Research Trends, Polymer Science and Technology
Publisher: Nova Science Publishers, New York, USA.
Pub. Date: May,2011
ISBN: 978-1-61761-304-3
03. Book Title: Solar Cells
Chapter title: “Fabrication of Zinc oxide based dye sensitized solar cells”
Publisher: InTech - an Open Access publisher covering the fields of Science, Technology and Medicine.
Page: Submitted
Pub. Date: 2011
ISBN: 978-953-307-316-3.
04. Book Title: Engineering Chemistry - I
- Co-Authored a Book – Engineering Chemistry - I with CD Rom - animations (CBT), Sonaversity, Sona College of Technology, Salem – 2011
List of Conference Publications
- Periyayya Uthirakumar, Ji Hye Kang, Beo Deul Ryu, and Chang-Hee Hong. “Impact of hybrid ITO/ZnO Texturing on the High Efficiency GaN based Light Emitting Diodes”, Proc. International Conference on Nanoscience and Nanotechnology (ICONN-2010), 139-140 (2010).
- P.M. Shanthi, M.Ashok, T.Balasubramanian, and Periyayya Uthirakumar, “Synthesis and Characterization of Nano Spherical Hydroxyapatite for Drug Delivery and Tissue Engineering” Proc. SPIE, 7403-21, (2009)
- Periyayya Uthirakumar and Chang-Hee Hong,“Zinc Oxide Nanostructures Derived from a Simple Solution Method for Solar Cells and LEDs”,Applied Science Innovations Pvt. Ltd., India. Proceeding of ICNM - 2009, Pages: 327 - 332.
- Periyayya Uthirakumar, Youn-Sik Lee, and Chang-Hee Hong: “Novel Fluorescent Polymer-Zinc oxide hybrids for Bright and Efficient White Light Emitting Diodes”, Proc. SPIE, 6355, (2006) 63550Z.
List of Conference Presentation
- Delivered an invited speech on “Organic fluorescent polymer/ZnO hybrid nanomaterials for light emitting diodes” at Future Energy Materials and Devices Center, Chonbuk National University. 664-14, Dickjin-done 1 Ga, Jeonju 561-756, Republic of Korea on June 22nd , 2012.
- Delivered an invited speech on “Preparation of silver spheres for high power light emitting diodes” at Semiconductor Physics Research Center, Chonbuk National University. 664-14, Dickjin-done 1 Ga, Jeonju 561-756, Republic of Korea on June 22nd , 2012.
- Offered to deliver an “Invited talk” at Third International multicomponent polymer conference (IMPC-2012) at Mahatma Gandhi University, Kottayam, Kerala, on Mar 23-25, 2012.
- Invited to deliver a special lecture on “Basic information on Nanomaterials and Nanofluids” at CSIR sponsored seminar on “Emerging application of Nanofulids in Mechanical Engineering” at K.S. Rangasamy College of Technology, KSR Kalvi nagar, Tiruchengode, India, March 15-16, 2011.
- Delivered an invited speech on “Impact of Surface texturing on High Performance GaN-based Light Emitting Diodes” at First International Conference on Composites and Nanocomposites (ICNC-2011), at Mahatma Gandhi University, Athirampuzha-Kottayam, Kerala, India, Jan 7-9, 2011.
- Delivered an invited talk on “Preparation of silver particles for high power light emitting diodes” at International Conference on Recent Trends in Material Science and Technology (ICMST-2010) Organized by Indian Institute of Space Science and Technology (IIST), Trivandrum jointly with Materials Research Society of India (MRSI), Trivandrum, October 28 - 31, 2010.
- Delivered an oral talk on “Impact of hybrid ITO/ZnO Texturing on the High Efficiency GaN based Light Emitting Diodes”, at International Conference on Nanoscience and Nanotechnology (ICONN-2010), organized by SRM University, Kattankulathur, February 24-26, 2010.
- Presented “A Solution Chemistry Approach to Prepare Ag/ZnO Heterostructure Nanoparticles and their Photocatalytic activities”, at International Conference of Nano Science and Nano Technology, GJ-NST 2009, organized by Mokpo National University, Mokpo, South Korea, November 5-6, 2009.
- Presented “Improved light extraction efficiency of GaN-based light emitting diodes using ITO/ZnO layer texturing”, at 8th International Conference on Nitride Semiconductor (ICNS-8), organized by ICC Jeju, Korea, October 18~23, 2009.
- Presented “Enhancement of light output power in GaN based LEDs with a nano-textured GaN surface using ITO nanospheres”, at 8th International Conference on Nitride Semiconductor (ICNS-8), organized by ICC Jeju, Korea, October 18~23, 2009.
- Presented “Enhanced light output power of InGaN/GaN LEDs with Overcut Sideholes formed by wet etching”, at 8th International Conference on Nitride Semiconductor (ICNS-8), organized by ICC Jeju, Korea, October 18~23, 2009.
- Delivered an invited talk on “ZnO nanostructures derived from solution method for solar cell and LEDs” at International Conference on Nanostructured Materials and Nanocomposites (ICNM-2009), organized by Mahatma Gandhi University, Kottyam, India, April 6 ~ 8, 2009.
- Presented “Improved light extraction efficiency of GaN based LEDs using ZnO nanomaterials”, at International Conference of Nano Science and Nano Technology, GJ-NST 2008, organized by Chonnam National University, Gwangju, South Korea, November 6-7, 2008.
- Presented “A Catalyst Free Approach to prepare Nano to Microstructures of GaN from a Single Molecular Complex Precursor”, at 14th International symposium on the Physics of Semiconductors and Applications (ISPSA2008), organized by Ramada Plaza Hotel, Jeju island, South Korea, August 26-29, 2008.
- Presented “Growth and Morphology of Less Populated ZnO Nanorods Prepared from a Simple Solution Method”, at XVI International Materials Research Congress, August 19-23, 2007. Cancún, México.
- Presented “Synthesis and Improved Luminescence Properties of OLED/ZnO Hybrid Materials via Chemical Bath Deposition”, at XVI International Materials Research Congress, August 19-23, 2007. Cancún, México.
- Presented “Nano to Microstructures of Single Crystalline GaN Particles: Catalyst Free Synthesis from a Single Molecular Complex Precursor”, at International conference on Nano Science and Nano Technology, GJ-NST 2007, Kimdaejung convention center, Gwangju, South Korea, November 8-9, 2007.
- Presented “The Impact of ZnO interlayer on the Growth and Morphology of Broom-like Single Crystalline GaN”, at International Conference on Nano Science and Nano Technology, GJ-NST 2007, Kimdaejung convention center, Gwangju, South Korea, November 8-9, 2007.
- Presented “Synthesis and Optical Properties of Sword-like GaN nanorods Clusters”, at “The 5th International Nanotech Symposium and Exhibition in Korea, NanoKorea2007”, KINTEX, South Korea, August 29-31, 2007.
- Presented “Low Temperature Solution Approach for Nano/Micron Sized ZnO particles: Free from Catalyst, Surfactant, Base, and Template etc” at “The 3rd Aria-Pacific Workshop on Widegap Semiconductors” (APWS2007), Jeonju Core Riviera Hotel, Jeonju, South Korea, March 11-14, 2007.
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Presented “Novel Fluorescent Polymer-Zinc oxide hybrids for Bright and Efficient White Light Emitting Diodes” at “The Asia Pacific Optical Communications” (APOC2006), Kimdaejung Convention Center, Gwangju, South Korea, 3-7 September 2006.
- Presented “Synthesis and Characterization of Fluorescent Polymers for White Light Emitting Diodes, as LUCO material” at “The Polymer Society of Korea”, International Conference Center, Jeju island, South Korea, October 13~14, 2005.
- Presented “Preparation of High Impact Polystyrene/Clay Nanocomposite using Cationic Azo-initiator/MMT hybrid” at “The Korean Society of Industrial and Engineering Chemistry”, Korea University, Seoul, South Korea, August 26~28, 2005.
- Presented “New Difunctional Radical Initiators for Polystyrene/Clay Nanocomposites” at 3rd Asia Pacific Nanotechnology Forum (APNF), Shanghai Nanotechnology Promotion Center (SNPC), Shanghai, P.R. China, December 9~12, 2004.
- Presented “High Impact Polystyrene–Graft-Polybutadiene Nanocomposites Prepared from a Difunctional Cationic Azo-Initiator/MMT Hybrid” at The Korean Society of Industrial and Engineering Chemistry, Kangnung National University, Kangnung, South Korea, May 7~8, 2004.
- Presented “Mechanical Properties of Polystyrene/MMT nanocomposites prepared using a Cationic Radical Initiator/MMT Hybrid” at The Korean Society of Industrial and Engineering Chemistry, Kangnung National University, Kangnung, South Korea, May 7~8, 2004.
- Presented an oral talk on “New Difunctional Radical Initiators for Polystyrene/Clay Nanocomposites” at The Korean Society of Industrial and Engineering Chemistry, Hoeso University, Aasan, South Korea. October 29 ~ 30, 2004.
- Presented an oral talk on “Synthesis of Difunctional Cationic Azo-Initiator/MMT Hybrids for in-situ Polymerization of Styrene” at The Korean Society of Industrial and Engineering Chemistry, Seoul National University, Seoul, South Korea. October 31~November 1, 2003.
- Presented “Preparation of Radical Initiator-clay Hybrids for Polymer Nanocomposites” at 8th Pacific Polymer Conference, Bangkok, Thailand, November 24~27, 2003.
REFERENCES
1) Prof. Youn-Sik Lee (yosklear@jbnu.ac.kr)
Professor,
Fine Chemistry Lab,
Division of Environmental and Chemical Engineering,
Chonbuk National University, Chonju,
Chonbuk, South Korea
2) Prof. Chang-Hee Hong, Ph.D (chhong@jbnu.ac.kr)
Professor, School of Semiconductor and Chemical Technology,
Semiconductor Physics Research Center,
Chonbuk National University,
SouthKorea.