Single-source molecular precursors for the deposition of zinc selenide quantum dots

Abstract

TOPO (tri-n-octylphosphine oxide)-capped ZnSe (in the form of close to mono-dispersed nanoparticles) has been prepared by a single source route using ethyl(diethyldiselenocarbamato)zinc(ii) as a precursor. The nanoparticles obtained show quantum size effects in their optical spectra and exhibit near band-edge luminescence. A blue shift of 0.25eV in relation to the bulk material is observed. The selected area electron diffraction (SAED) and X-ray diffraction (XRD) patterns show the material to be hexagonal. The crystallinity of the material was also evident from high-resolution transmission electron microscopy (HRTEM) which gave well defined images of nanosize particles with clear lattice fringes.

References

1. D. Duongong, J. Ramsden and M. Gratzel, J. Am. Chem. Soc., 1982, 104, 2977.
2. R. Rossetti, J. L. Ellison, J. M. Gibson and L. E. Brus, J. Chem. Phys., 1984, 80, 4464.
3. A. Henglein, Chem. Rev., 1989, 89, 1861.
4. M. L. Steigerwald and L. E. Brus, Acc. Chem. Res., 1990, 23, 183.
5. Y. Wang and N. Herron, J. Phys. Chem., 1991, 95, 525.
6. H. Weller, Adv. Mater., 1993, 5, 88.
7. V. L. Leppert, S. H. Risbud and M. J. Fendorf, Philos. Mag. Lett., 1997, 75, 29.
8. N. Chestnoy, R. Hull and L. E. Brus, J. Chem. Phys., 1986, 85, 2237.
9. G. Li and M. Nogami, J. Appl. Phys., 1994, 75, 4276.
10. T. Trindade and P. O'Brien, Adv. Mater., 1996, 8, 161.
11. T. Trindade and P. O'Brien, Chem. Mater., 1997, 9, 523.
12. R. A. Zingaro and J. C. White, J. Inorg. Nucl. Chem., 1960, 12, 315.
13. L. Henrikson and E. S. S. Kristansen, Int. J. Sulfur Chem., Part A, 1972, 2, 133.
14. L. Henriksen, Int. J. Sulfur Chem., 1973, 8, 389.
15. M. A. Malik and P. O'Brien, Mater. Chem., 1991, 3, 999.
16. M. B. Hursthouse, M. A. Malik, M. Motevalli and P. O'Brien, J. Mater. Chem., 1992, 2, 949.
17. C. B. Murray, D. J. Norris and M. G. Bawendi, J. Am. Chem. Soc., 1993, 115, 8706.
18. D. Duonghong, J. Ramsden and M. Gratzell, J. Am. Chem. Soc., 1982, 104, 2977.
19. A. Hagfeldt and M. Gratzell, Chem. Rev., 1995, 95, 49.
20. L. E. Brus, J. Chem. Phys., 1984, 80, 4403.
21. L. E. Brus, J. Phys. Chem., 1986, 90, 2555.
22. J. I. Pankove, Optical Processes in Semiconductors, Dover Publications, Inc., New York, 1970.
23. J. E. B. Katari, V. L. Colvin and A. P. Alivisatos, J. Phys. Chem., 1994, 98, 4109.
24. L. E. Brus, J. Chem. Phys., 1983, 79, 5566.
25. M.-A. Hines and P. Guyot-Sinnest, J. Phys. Chem. B, 1998, 102, 3655.