Sameer Sapra




Sameer Sapra



Associate Professor


Born: Oct 1974, New Delhi
Ph.D. (Prof. D. D. Sarma), IISc Bangalore, 2004
Post Doctoral Fellow: LMU Munich, Prof. Andrey Rogach, May 05 - Apr 06
Post Doctoral Fellow: TU Dresden, Prof. Dr. Alexander Eychmueller, May 06 - Jan 08
Assistant Professor: Indian Institute of Technology Bombay, Jan 08-Jun 08
Assistant Professor: Indian Institute of Technology Delhi, Jul 08-Dec 12
Associate Professor: Indian Institute of Technology Delhi, Dec 12-present


Group Webpage



Research Interests


Our research focuses on the synthesis and applications of nanocrystals: in particular semiconductor nanocrystals or quantum dots. The interest in nanocrystals stems from the fact that these tiny fragments of matter exhibit properties dependent on the size of the crystals. Semiconductors offer the possibility of obtaining fluorescence owing to excitation decay across the band gap. The band gap of a semiconductor, and therefore the energy of emission, can be tuned by changing the size of the nanocrystals in accordance with the quantum confinement effects. Our group concentrates mainly on the group II-VI chalcogenides, namely that of cadmium and zinc for the visible region of the electromagnetic spectrum, group IV-VI semiconductors such as PbS and PbSe for the infra-red region. Also, we are actively engaged in designing new materials with the possibility of charge separation across interfaces. These materials are highly desirable for applications such as photocatalysis, photovoltaics and photoconductivity.



Selected Publications


  1. A. Pal, I. Ghosh, S. Sapra, B. Koenig, Quantum dots in visible light photoredox catalysis: Reductive dehalogenations and C-H arylation reactions using aryl bromides, Chem. Mater. 29, 5225 (2017).
  2. S. Yadav, B. Adhikary, P. Tripathy, S. Sapra, Efficient Charge Extraction from CdSe/ZnSe Dots-on-Plates Nanoheterostructures, ACS Omega 2, 2231 (2017).
  3. R. Ahmad, R. Srivastava, S. Yadav, D. Singh, G. Gupta, S. Chand, S. Sapra, Functionalized MoS2 Nanosheets for 0D-2D Hybrid Nanostructure: Photoinduced Charge Transfer and Enhanced Photoresponse, J. Phys. Chem. Lett. 8, 1729 (2017).
  4. A. Jana, M. Mittal, A. Singla, S. Sapra, Solvent-free, mechanochemical syntheses of bulk trihalide perovskites and their nanoparticles, Chem. Commun. 53, 3046 (2017).
  5. M. Mittal, A. Jana, S. Sarkar, P. Mahadevan, S. Sapra, Size of the Organic Cation Tunes the Band Gap of Colloidal Organolead Bromide Perovskite Nanocrystals, J. Phys. Chem. Lett. 7, 3270 (2016).





Group

      Group Members


    Post-docs
  • Dr. Atanu Jana
  • Dr. Priya Kush
  • Dr. Susnata Bera
  • Dr. Arkajyoti Chakrabarty
    Ph.D. students
  • Sushma Yadav (M. Sc. IIT Delhi)
  • Mona Mittal (M. Sc. IIT Delhi)
  • Md Samim Hassan (M. Tech. Aligarh)
  • Satya Prakash Rai (M. Sc. Allahabad)
    M.Tech. students
  • Astita Dubey
  • Sowmya Vaddadi
    M.Sc. students