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Ajay Singh

Dr. Ajay Singh

Dr. Ajay Singh

Name: Ajay Singh

Education

2012 Ph.D., Inorganic chemistry, University of Limerick

2008 M.Sc., Chemistry, NIT Jalandhar, India

2006 B.Sc., Punjab University Chandigarh, India

Contact information: ajay18march@gmail.com,  ajay.singh@ul.ie

Research interests:

The objective of my research is mainly focused on the development of series of inorganic colloidal semiconductor nanocrystals (II-VI, Cu2ZnSn(SxSe1-x)4, CuInGa(S/Se)2, Cu2Zn(Ge1-xSnx )(SySe1-y)4 and its metal semiconductor heterojunction .I am also interested in the development of novel synthesis  strategies to control the shape, composition and crystal structure of these multicomponent nanocrystal. A key feature of my research is to develop assembly approaches to assemble particularly anisotropic structure (Nanorod) of these functional nanocrystals into high density 1D, 2D and 3D superlattice structures using various Self-assembly techniques such as drop casting, controlled solvent evaporation under an electric field, and electrophoresis. I am also looking on the possibilities of integrating these assembled nanocrystal architectures in low cost application such as solution processed solar cells.

 

LRTEM image shows highly monodisperse nanorod in (a) and a HRTEM of single nanorod in (b). (c) Top down TEM image shows close-packed vertical aligned nanorods with inset shows HRTEM image of single nanorod. (d) Cross-sectional SEM image of multilayer nanorod assembly by electrophoreses.

LRTEM image shows highly monodisperse nanorod in (a) and a HRTEM of single nanorod in (b). (c) Top down TEM image shows close-packed vertical aligned nanorods with inset shows HRTEM image of single nanorod. (d) Cross-sectional SEM image of multilayer nanorod assembly by electrophoreses.

 

(a)Angular dark-field STEM (DF-STEM) images shows different Moiré interference patterns arising from rotational offsets between respective monolayer sheets. (b) & (c) DF-STEM image with SAED pattern shows 12-fold quasicrystalline-like Moiré pattern revealed when the misorientation angle between two CdS nanorod layers is close to 30°.

(a) Angular dark-field STEM (DF-STEM) images shows different Moiré interference patterns arising from rotational offsets between respective monolayer sheets. (b) & (c) DF-STEM image with SAED pattern shows 12-fold quasicrystalline-like Moiré pattern revealed when the misorientation angle between two CdS nanorod layers is close to 30°.

Publications:

  1. A. Singh, H. Geaney, F. Laffir K. M. Ryan. J. Am. Chem. Soc. 2012 134, 2910.
  2. A. Singh, C. Coughlan, F. Laffir, K. M Ryan. ACS Nano 2012, 6, 6977.
  3. A. Singh, C. Dickinson, K. M. Ryan. ACS Nano 2012, 6, 3339.
  4. A. Singh, N. J. English, K. M. Ryan. J. Phys. Chem. B 2012, DOI: 10.1021/jp305184n (Featured as Editor’s Choice in Science Magazine)
  5. A. Singh, R. D. Gunning, S. Ahmed, C. A. Barrett, N. J. English, J. -A. Garate, K. M. Ryan.J. Mater. Chem. 2012, 22, 1562.
  6. A. Singh, R. D. Gunning, A. Sanyal, K. M. Ryan. Chem Commun. 2010, 46, 7193.
  7. T. Bala, A. Singh, A. Sanyal, C. O’Sullivan, F. Laffir, C. Coughlan, K. M. Ryan. Nano Res. DOI: 10.1007/s12274-013-0287-9
  8. D. Kelly, A. Singh, C. A. Barrett, C. O’Sullivan, C. Coughlan, F. R. Laffir, C. O’Dwyer, K. M. Ryan. Nanoscale 2011, 3, 4580.
  9. C. Barrett, A. Singh, J. Murphy, C. O’Sullivan, D. N. Buckley, K. M. Ryan. Langmuir 2011, 27, 11166.
  10. H. Geaney, C. Dickinson, C. O’Dwyer, E. Mullane, A. Singh, K. M. Ryan. . Chem. Mater. 2012,
  11. H. Geaney, T. Kennedy, C. Dickinson, E. Mullane, A. Singh,  K. M. Ryan. Chem. Mater. 2012, 24, 2204.
  12. T. Bala, A. Sanyal, A. Singh, D. Kelly, C. O’Sullivan, F. Laffir, K. M. Ryan. J. Mater. Chem. 2011, 21, 6815.
  13. J. –A. Garate, N. J. English, A. Singh, K. M. Ryan, D. A. Mooney, J. M. D. MacElroy. Langmuir 2011, 27, 13506.
  14. C. O’Sullivan, S. Crilly, F. R. Laffir, A. Singh, E. Magner, K. M. Ryan Chem Commun. 2011, 47, 2655.
  15. C. O’Sullivan, R. D. Gunning, C. Barrett, A. Singh, Kevin M Ryan. J. Mater. Chem.  2010, 20, 7875.
  16. A. Sanyal, T. Bala, S. Ahmed, A. Singh, F. Laffir, A. Pitterina, K. M. Ryan. J. Mater. Chem. 2009, 19, 8974.