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I did doctoral research at the Indian Association for the Cultivation of Sciences, Kolkata in the Dept. of Materials Science under the supervision of Prof. Narayan Pradhan. I have been working on materials chemistry, especially on colloidal nanochemistry and nanotechnology, which covers design and synthesis of different colloidal quantum dots (QDs), doping, halide perovskite QDs, and self-assembly. After my Ph.D graduation, I spent 11 month in Singapore Bio Imaging Consortium as a research fellow. After that, I have moved to Laboratoire de Physique des Solides (LPS), France as CNRS post-doctoral research fellow and Marie Curie individual research fellow on the self-assembly of 2D CdSe nanoplatelets. In 2015, I have received Marie Skodowska-Curie Individual Fellowship from EU Horizon 2020 (DECAGON, 661199), for carried out his postdoctoral research work in LPS, France. From January 1, 2018 I was working as Post-doctoral fellow under Prof. Elvira Fortunato in CENIMAT-i3N, Universidade Nova de Lisboa, where my main work is based on the design of different inorganic semiconductors for electronic applications. In 2019, he won the individual call to scientific employment stimulus (CEEC - 2nd Edition) as a senior researcher. His work mainly involvs colloidal semiconductor chemistry and application in electronics. He has published 34 international high impact journal (ACS Nano, Nano Letter, J Mater.Chem. A, ACS Photonics, ACS Applied Mater. Int. ;Science Advances ) with H-index 19 and total citation now 1723. I am part of three different PRR project BeNeutral, R2U and Fossils to For-ests, where I am leading the development of QD ink displays and fluorescent paint, for different industries, including TMG Automotive, BySteel, Displax, and CITEVE, a textile industry, to develop fluorescent textiles. I've actively contributed to shaping scientific discourse and promoting excellence in research. Where My career profile reflects a commitment to pushing the boundaries of scientific understanding and driving technological innovation for the betterment of society.
Identificação

Identificação pessoal

Nome completo
Santanu Jana

Nomes de citação

  • Jana, Santanu

Identificadores de autor

Ciência ID
6B12-FB66-5AFC
ORCID iD
0000-0002-4136-1852
Google Scholar ID
https://scholar.google.com/citations?user=Fyg6g9gAAAAJ&hl=en

Endereços de correio eletrónico

  • s.jana@fct.unl.pt (Profissional)
  • sjchem@gmail.com (Pessoal)

Telefones

Telemóvel
  • 920598312 (Pessoal)

Moradas

  • CENIMAT/i3N. Faculdade de Ciências e Tecnologia–Universidade NOVA de Lisboa, 2829-516 , Caparica, Almada, Portugal (Profissional)
  • Rua São Lourenço Poente, No. 37- 5B, 2825-023, Monte de Caparica, Almada, Portugal (Pessoal)

Websites

Domínios de atuação

  • Ciências da Engenharia e Tecnologias - Engenharia dos Materiais
  • Ciências da Engenharia e Tecnologias - Nanotecnologia - Nanomateriais
  • Ciências da Engenharia e Tecnologias - Nanotecnologia - Nanoprocessos
  • Ciências da Engenharia e Tecnologias - Nanotecnologia - Nanoprocessos

Idiomas

Idioma Conversação Leitura Escrita Compreensão Peer-review
Inglês Utilizador proficiente (C1) Utilizador proficiente (C1) Utilizador proficiente (C1) Utilizador proficiente (C1)
Formação
Grau Classificação
2013
Concluído
Ph.D (Doutoramento)
Indian Association for the Cultivation of Science, Índia

University of Calcutta, Índia
"Synthesis, Photo-physical Studies and Applications of Doped and Undoped Semiconductor Nanocrystals" (TESE/DISSERTAÇÃO)
Doctorate
2007
Concluído
Masters of Science (Mestrado)
Presidency University Kolkata, Índia
"Synthesis of Cu-Amine based Co-ordinating Molecule and their Characterisation" (TESE/DISSERTAÇÃO)
1st
2005
Concluído
Bachelor of Science (Hons.) (Licenciatura)
University of Calcutta, Índia
"N/A" (TESE/DISSERTAÇÃO)
1st Class
Percurso profissional

Ciência

Categoria Profissional
Instituição de acolhimento
Empregador
2020/07/01 - Atual Investigador Auxiliar (carreira) (Investigação) Fundação para a Ciência e a Tecnologia, Portugal
Universidade Nova de Lisboa Centro de Investigação em Materiais, Portugal
2018/01/02 - 2020/06/30 Pós-doutorado (Investigação) Universidade Nova de Lisboa Centro de Investigação em Materiais, Portugal
Universidade Nova de Lisboa Centro de Investigação em Materiais, Portugal

Outros

Categoria Profissional
Instituição de acolhimento
Empregador
2016/01/11 - 2018/01/31 Marie Sklodowska-Curie Individual Fellow Laboratoire de Physique des Solides, França
2014/01/11 - 2016/01/10 CNRS Post-Doctoral Research Associate Laboratoire de Physique des Solides, França
2013/02/13 - 2013/12/31 Research Fellow (Post-Doctoral) Agency for Science Technology and Research, Singapura
2008/01/07 - 2013/01/07 Ph.D student conducted by Council of Scientific and Industrial Research, New Delhi, India. Qualified National Eligibility Test (NET), 2008 for PhD program Indian Association for the Cultivation of Science, Índia
Projetos

Bolsa

Designação Financiadores
2022/06/01 - 2025/05/31 Cellulose based Bio-foam for Interactive Energy Harvester
M-ERA.NET3/0004/2021
Investigador
Em curso
2019 - 2023/12/31 Multifunctional Digital Materials Platform for Smart Integrated Applications
Investigador
Universidade Nova de Lisboa Departamento de Ciência dos Materiais, Portugal
European Commission
2016/01/11 - 2018/01/10 Doping Colloidal Nanoplatelets: Synthesis, Self-assembly and Spectroscopy
Bolseiro de Pós-Doutoramento
Laboratoire de Physique des Solides, França

École normale supérieure de Lyon, França
EU Framework Programme for Research and Innovation Marie Sklodowska-Curie Actions
Concluído

Projeto

Designação Financiadores
2021/01/01 - 2025/12/31 Institute of Nanostructures, Nanomodelling and Nanofabrication
LA/P/0037/2020
Universidade NOVA de Lisboa, Portugal

Instituto de Nanoestruturas Nanomodelação e Nanofabricação, Portugal

UNINOVA Instituto de Desenvolvimento de Novas Tecnologias, Portugal

Universidade de Aveiro, Portugal

Associação para a Inovação e Desenvolvimento da FCT, Portugal
Fundação para a Ciência e a Tecnologia
Em curso
2021/01/01 - 2025/12/31 Institute of Nanostructures, Nanomodelling and Nanofabrication
LA/P/0037/2020
Universidade Nova de Lisboa, Portugal

Instituto de Nanoestruturas Nanomodelação e Nanofabricação, Portugal

UNINOVA Instituto de Desenvolvimento de Novas Tecnologias, Portugal

Universidade de Aveiro, Portugal

Universidade Nova de Lisboa Associação para a Inovação e Desenvolvimento da FCT, Portugal
Fundação para a Ciência e a Tecnologia
Em curso
2021/01/01 - 2025/12/31 Instituto de Nanoestruturas, Nanomodelação e Nanofabricação
LA/P/0037/2020
Universidade Nova de Lisboa, Portugal
Fundação para a Ciência e a Tecnologia
Em curso
2020/10/01 - 2024/03/31 SYmbiosis for eNERGY harversting concepts for smart platforms on foils
952169
Investigador
European Commission
Em curso
Produções

Publicações

Artigo em conferência
  1. Jana, S.; Srivastava, B.B.; Sarma, D.D.; Pradhan, N.. "Highly emissive transition metal ion doped semiconducting nanocrystals". 2011.
    10.1063/1.3605846
Artigo em revista
  1. Shrabani Panigrahi; Santanu Jana; Tomás Calmeiro; Elvira Fortunato; Manuel J. Mendes; Rodrigo Martins. "MXene-Enhanced Nanoscale Photoconduction in Perovskite Solar Cells Revealed by Conductive Atomic Force Microscopy". ACS Applied Materials & Interfaces (2023): https://doi.org/10.1021/acsami.3c16245.
    10.1021/acsami.3c16245
  2. Ugur D. Menda; Guilherme Ribeiro; Jonas Deuermeier; Esther López; Daniela Nunes; Santanu Jana; Irene Artacho; et al. "Thermal-Carrier-Escape Mitigation in a Quantum-Dot-In-Perovskite Intermediate Band Solar Cell via Bandgap Engineering". ACS Photonics (2023): https://doi.org/10.1021/acsphotonics.3c00738.
    10.1021/acsphotonics.3c00738
  3. Ribeiro, G.; Ferreira, G.; Menda, U. D.; Alexandre, M.; Brites, M. J.; Barreiros, M. A.; Jana, S.; et al. "Sub-Bandgap Sensitization of Perovskite Semiconductors via Colloidal Quantum Dots Incorporation". Nanomaterials (2023): https://publons.com/wos-op/publon/62308155/.
    10.3390/NANO13172447
  4. Rodrigo Ferreira; Monirul Shaikh; Suresh Kumar Jakka; Jonas Deuermeier; Pedro Barquinha; Saurabh Ghosh; Elvira Fortunato; Rodrigo Martins; Santanu Jana. "Bandlike Transport in FaPbBr3 Quantum Dot Phototransistor with High Hole Mobility and Ultrahigh Photodetectivity". Nano Letters (2022): https://doi.org/10.1021/acs.nanolett.2c03317.
    10.1021/acs.nanolett.2c03317
  5. Shrabani Panigrahi; Mukaddar SK; Santanu Jana; Saurabh Ghosh; Jonas Deuermeier; Rodrigo Martins; Elvira Fortunato. "Tailoring the Interface in High Performance Planar Perovskite Solar Cell by ZnOS Thin Film". ACS Applied Energy Materials (2022): https://doi.org/10.1021/acsaem.1c04064.
    10.1021/acsaem.1c04064
  6. Santanu Jana; Rodrigo Martins; Elvira Fortunato. "Stacking-Dependent Electrical Transport in a Colloidal CdSe Nanoplatelet Thin-Film Transistor". Nano Letters (2022): https://doi.org/10.1021/acs.nanolett.1c04822.
    10.1021/acs.nanolett.1c04822
  7. Santanu Jana; Emanuel Carlos; Shrabani Panigrahi; Rodrigo Martins; Elvira Fortunato. "Toward Stable Solution-Processed High-Mobility p-Type Thin Film Transistors Based on Halide Perovskites". ACS Nano (2020): https://doi.org/10.1021/acsnano.0c02862.
    10.1021/acsnano.0c02862
  8. Shrabani Panigrahi; Santanu Jana; Tomás Calmeiro; D. Nunes; Jonas Deuermeier; Rodrigo Martins; Elvira Fortunato. "Mapping the space charge carrier dynamics in plasmon-based perovskite solar cells". Journal of Materials Chemistry A 7 34 (2019): 19811-19819. https://novaresearch.unl.pt/en/publications/b004f219-565c-4ee5-8f6f-b24622641653.
    10.1039/c9ta02852h
  9. Shrabani Panigrahi; Santanu Jana; Tomás Calmeiro; Daniela Nunes; Jonas Deuermeier; Rodrigo Martins; Elvira Fortunato. "Mapping the space charge carrier dynamics in plasmon-based perovskite solar cells". Journal of Materials Chemistry A (2019): https://doi.org/10.1039/C9TA02852H.
    10.1039/C9TA02852H
  10. Shrabani Panigrahi; Santanu Jana; Tomás Calmeiro; Daniela Nunes; Rodrigo Martins; Elvira Fortunato. "Imaging the Anomalous Charge Distribution Inside CsPbBr3 Perovskite Quantum Dots Sensitized Solar Cells". ACS Nano 11 10 (2017): 10214-10221. https://doi.org/10.1021/acsnano.7b04762.
    10.1021/acsnano.7b04762
  11. Santanu Jana; Marta de Frutos; Patrick Davidson; Benjamin Abécassis. "Ligand-induced twisting of nanoplatelets and their self-assembly into chiral ribbons". Science Advances (2017): https://doi.org/10.1126/sciadv.1701483.
    10.1126/sciadv.1701483
  12. Santanu Jana; Patrick Davidson; Benjamin Abécassis. "CdSe Nanoplatelets: Living Polymers". Angewandte Chemie 128 32 (2016): 9517-9520. https://doi.org/10.1002%2Fange.201603880.
    10.1002/ange.201603880
  13. Santanu Jana; Patrick Davidson; Benjamin Abécassis. "CdSe Nanoplatelets: Living Polymers". Angewandte Chemie International Edition 55 32 (2016): 9371-9374. https://doi.org/10.1002%2Fanie.201603880.
    10.1002/anie.201603880
  14. Santanu Jana; Trang N. T. Phan; Cécile Bouet; Mickael D. Tessier; Patrick Davidson; Benoit Dubertret; Benjamin Abécassis. "Stacking and Colloidal Stability of CdSe Nanoplatelets". Langmuir 31 38 (2015): 10532-10539. http://dx.doi.org/10.1021/acs.langmuir.5b02152.
    10.1021/acs.langmuir.5b02152
  15. Liyun Zhang; Jun Cheng Er; Wang Xu; Xian Qin; Animesh Samanta; Santanu Jana; Chi-Lik Ken Lee; Young-Tae Chang. "“Orange alert”: A fluorescent detector for bisphenol A in water environments". Analytica Chimica Acta 815 (2014): 51-56. http://dx.doi.org/10.1016/j.aca.2014.01.038.
    10.1016/j.aca.2014.01.038
  16. Animesh Samanta; Santanu Jana; Raj Kumar Das; Young Tae Chang. "Biocompatible surface-enhanced Raman scattering nanotags for in vivo cancer detection". Nanomedicine 9 3 (2014): 523-535. http://dx.doi.org/10.2217/nnm.13.222.
    10.2217/nnm.13.222
  17. Animesh Samanta; Santanu Jana; Raj Kumar Das; Young-Tae Chang. "Wavelength and shape dependent SERS study to develop ultrasensitive nanotags for imaging of cancer cells". RSC Adv. 4 24 (2014): 12415-12415. http://dx.doi.org/10.1039/c3ra46208k.
    10.1039/c3ra46208k
  18. Riya Bose; Goutam Manna; Santanu Jana; Narayan Pradhan. "Ag2S–AgInS2: p–n junction heteronanostructures with quasi type-II band alignment". Chem. Commun. 50 23 (2014): 3074-3074. http://dx.doi.org/10.1039/c3cc48903e.
    10.1039/c3cc48903e
  19. Santanu Jana; Goutam Manna; Bhupendra B. Srivastava; Narayan Pradhan. "Doped Nanocrystals: Tuning the Emission Colors of Semiconductor Nanocrystals Beyond their Bandgap Tunability: All in the Dope (Small 22/2013)". Small 9 22 (2013): 3904-3904. http://dx.doi.org/10.1002/smll.201370136.
    10.1002/smll.201370136
  20. Riya Bose; Santanu Jana; Goutam Manna; Supriya Chakraborty; Narayan Pradhan. "Rate of Cation Exchange and Change in Optical Properties during Transformation of Ternary to Doped Binary Nanocrystals". J. Phys. Chem. C 117 30 (2013): 15835-15841. http://dx.doi.org/10.1021/jp403218g.
    10.1021/jp403218g
  21. Santanu Jana; Goutam Manna; Bhupendra B. Srivastava; Narayan Pradhan. "Tuning the Emission Colors of Semiconductor Nanocrystals Beyond their Bandgap Tunability: All in the Dope". Small 9 22 (2013): 3753-3758. http://dx.doi.org/10.1002/smll.201300635.
    10.1002/smll.201300635
  22. Santanu Jana; Bhupendra B. Srivastava; Narayan Pradhan. "A Controlled Growth Process To Design Relatively Larger Size Semiconductor Nanocrystals". J. Phys. Chem. C 117 2 (2013): 1183-1188. http://dx.doi.org/10.1021/jp310783a.
    10.1021/jp310783a
  23. Sibasish Paul; Santanu Jana; Jhuma Bhadra; Surajit Sinha. "Photophysical studies and submicron ring formation of morpholino U-nucleoside monomers". Chem. Commun. 49 96 (2013): 11278-11278. http://dx.doi.org/10.1039/c3cc45082a.
    10.1039/c3cc45082a
  24. Goutam Manna; Santanu Jana; Riya Bose; Narayan Pradhan. "Mn-Doped Multinary CIZS and AIZS Nanocrystals". J. Phys. Chem. Lett. 3 18 (2012): 2528-2534. http://dx.doi.org/10.1021/jz300978r.
    10.1021/jz300978r
  25. Santanu Jana; Bhupendra B. Srivastava; Somnath Jana; Riya Bose; Narayan Pradhan. "Multifunctional Doped Semiconductor Nanocrystals". J. Phys. Chem. Lett. 3 18 (2012): 2535-2540. http://dx.doi.org/10.1021/jz3010877.
    10.1021/jz3010877
  26. Chattopadhyay, S.; Jana, S.; Giri, S.; Majumdar, S.. "An agglomeration induced glassy magnetic state in a carbon nanotube/NiO nanocomposite system". Journal of Physics Condensed Matter 24 43 (2012): http://www.scopus.com/inward/record.url?eid=2-s2.0-84867279511&partnerID=MN8TOARS.
    10.1088/0953-8984/24/43/436005
  27. Santanu Jana; Bhupendra B. Srivastava; Narayan Pradhan. "Correlation of Dopant States and Host Bandgap in Dual-Doped Semiconductor Nanocrystals". J. Phys. Chem. Lett. 2 14 (2011): 1747-1752. http://dx.doi.org/10.1021/jz200673q.
    10.1021/jz200673q
  28. Bhupendra B. Srivastava; Santanu Jana; Narayan Pradhan. "Doping Cu in Semiconductor Nanocrystals: Some Old and Some New Physical Insights". J. Am. Chem. Soc. 133 4 (2011): 1007-1015. http://dx.doi.org/10.1021/ja1089809.
    10.1021/ja1089809
  29. Srivastava, B.B.; Jana, S.; Pradhan, N.. "Doping Cu in semiconductor nanocrystals: Some old and some new physical insights". Journal of the American Chemical Society 133 4 (2011): 1007-1015. http://www.scopus.com/inward/record.url?eid=2-s2.0-79851481000&partnerID=MN8TOARS.
    10.1021/jal089809
  30. Bhupendra B. Srivastava; Santanu Jana; D. D. Sarma; Narayan Pradhan. "Surface Ligand Population Controlled Oriented Attachment: A Case of CdS Nanowires". J. Phys. Chem. Lett. 1 13 (2010): 1932-1935. http://dx.doi.org/10.1021/jz1006077.
    10.1021/jz1006077
  31. Bhupendra B. Srivastava; Santanu Jana; Niladri S. Karan; Sayantan Paria; Nikhil R. Jana; D. D. Sarma; Narayan Pradhan. "Highly Luminescent Mn-Doped ZnS Nanocrystals: Gram-Scale Synthesis". J. Phys. Chem. Lett. 1 9 (2010): 1454-1458. http://dx.doi.org/10.1021/jz100378w.
    10.1021/jz100378w
  32. Mrinal Dutta; Santanu Jana; Durga Basak. "Quenching of Photoluminescence in ZnO QDs Decorating Multiwalled Carbon Nanotubes". ChemPhysChem 11 8 (2010): 1774-1779. http://dx.doi.org/10.1002/cphc.200900960.
    10.1002/cphc.200900960
  33. Suresh Sarkar; Riya Bose; Santanu Jana; Nikhil R Jana; Narayan Pradhan. "Doped Semiconductor Nanocrystals and Organic Dyes: An Efficient and Greener FRET System". J. Phys. Chem. Lett. 1 3 (2010): 636-640. http://dx.doi.org/10.1021/jz9004015.
    10.1021/jz9004015
  34. Santanu Jana; Bhupendra B. Srivastava; Shinjita Acharya; Pralay K. Santra; Nikhil R. Jana; D. D. Sarma; Narayan Pradhan. "Prevention of photooxidation in blue–green emitting Cu doped ZnSe nanocrystals". Chem. Commun. 46 16 (2010): 2853-2853. http://dx.doi.org/10.1039/b925980e.
    10.1039/b925980e
Atividades

Apresentação oral de trabalho

Título da apresentação Nome do evento
Anfitrião (Local do evento)
2017/05/22 Self Assembly of CdSe Nanoplatelets" Materials Science Centre
Indian Institute of Science (Bengaluru, Índia)
2010/10/14 Highly Emissive Transition Metal Doped Semiconducting Nanocrystals 55th DAE solid state physics symposium
University of Manipal (Mangalore, Índia)
2009/10/30 Prevention of photo-oxidation of Cu2+ ion Doped Semiconducting Nanocrystals" Young Scientist Award
IEEE (Kolkata, Índia)

Orientação

Título / Tema
Papel desempenhado
Curso (Tipo)
Instituição / Organização
2024/02/14 - Atual Quantum dots in Halide perovskite: a novel semiconductor for highly efficient Intermediate Band solar cells
Orientador
MASTER IN MICRO AND NANOTECHNOLOGIES ENGINEERING (Mestrado)
Universidade Nova de Lisboa Departamento de Ciência dos Materiais, Portugal
2024/01/16 - Atual Low-cost Paper-based Humidity Sensor Tag for Intelligent Packaging
Coorientador
MASTER IN MICRO AND NANOTECHNOLOGIES ENGINEERING (Mestrado)
Universidade Nova de Lisboa Departamento de Ciência dos Materiais, Portugal
2021/02/07 - 2022/02/05 Metal Halide Perovskite Quantum Dots for Thin-Film Transistors
Orientador
MASTER IN MICRO AND NANOTECHNOLOGIES ENGINEERING (Mestrado)
Universidade Nova de Lisboa Departamento de Ciência dos Materiais, Portugal

Participação em evento

Descrição da atividade
Tipo de evento
Nome do evento
Instituição / Organização
2012/07/06 - Atual Poster Presentation on “Correlation of Dopant States and Host Bandgap in Dual Doped Semiconductor Nanocrystals” at International Conference of Young Researchers on Advanced Materials (ICYRAM 2012)-Materials Research Society Singapore, July1-6, 2012, Bioplis, Singapore.
Conferência
International Conference of Young Researchers on Advanced Materials (ICYRAM 2012)-Materials Research Society Singapore
2010/02/17 - Atual Poster Presentation on “Highly Emittive Transition Metal Doped Semiconducting Nanocrystals” at International Conference on Nano Science and Technology (ICONSAT 2010), February 17-20, 2010, IIT Bombay,Mumbai, India.
Conferência
International Conference on Nano Science and Technology (ICONSAT 2010)
Indian Institute of Technology Bombay, Índia
2016/07/31 - 2019/08/05 Poster Presentation on “CdSe Nanoplatelets Twisted Threads” at Colloidal Semiconductor Nanocrystals,
Conferência
Gordon Research Conference, Mount Snow, West Dover, USA
2017/09/22 - 2017/09/24 Poster Presentation on “CdSe Nanoplatelets: Self Assembly and Living Polymerization”
Conferência
Nano Ge September Meeting, Barcelona, Spain.
2016/07/18 - 2016/07/22 Attended for diploma 16th TEM-UCA European Summer Workshop,
Conferência
Transmission Electron Microscopy of Nanomaterials at Cadiz, Spain.
2015/09/15 - 2015/09/18 Poster Presentation on “CdSe Nanoplatelets Living Polymer” at E-MRS Fall Meeting, September 15-18, 2015, Warsaw University of Technology, Warsaw, Poland.
Conferência
E-MRS Fall Meeting
2014/05/26 - 2014/05/28 Poster Presentation on “Tuning the Emission Colors of Semiconductor Nanocrystals Beyond their Bandgap Tunability: All in the Dope”
Conferência
30 years of colloidal quantum dots (30-years-qds)
ESPCI Paris, França

Júri de grau académico

Tema
Tipo de participação
Nome do candidato (Tipo de grau)
Instituição / Organização
2022/12/15 Masters Thesis defence
Arguente
Guilherme Ferreira (Mestrado)
Universidade Nova de Lisboa Departamento de Ciência dos Materiais, Portugal

Arbitragem científica em revista

Nome da revista (ISSN) Editora
2023/01/01 - 2023/12/31 Journal of Energy Chemistry (2096-885X) Elsvier
Distinções

Prémio

2012 Best Poster Award
Materials Research Society Singapore, Singapura
2009 Young Scientist Award
Material Research Society of India (MRSI), Kolkata chapter, Índia

Outra distinção

2014 Marie Sklodowska-Curie Individual Fellowship
European Commission, Bélgica
2010 Senior Research Fellow
CSIR-UGC, Ministry of HRD, Govt. of India, Índia
2007 Junior Research fellow
CSIR-UGC, Ministry of HRD, Govt. of India, Índia