Synthesis of CdS nanocrystals using cadmium dichloride and trioctylphosphine sulfide

Abstract

The synthesis of CdS nanocrystals has been carried out by the thermolysis of cadmium dichloride with trioctylphosphine sulfide as the sulfur source, in tri-n-octylphosphine oxide at 250 °C. The material shows quantum size effects in the optical spectrum. The onset of absorption for CdS is at ≈480 nm (bulk CdS, 515 nm), a blue shift in the absorption edge. The spectrum also shows a second excitonic peak at 379 nm (S. Modes and P. Lianos, J. Phys. Chem., 1989, 93, 5854). The sample is composed of particles of diameter ca. 4.5 nm.

References

1. D. Dounghong, J. Ramsden and M. Grätzel, 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. B. O. Dabbousi, M. G. Bawendi, O. Onitsuka and M. F. Rubner, Appl. Phys. Lett., 1995, 66, 1316.
8. V. L. Colvin, M. C. Schlamp and A. P. Alivisatos, Nature, 1994, 370, 354.
9. F. Hakimi, M. G. Bawendi, R. Tumminelli and J. R. Haavisto, US Patent 5,260,957, 1993.
10. C. K. Grätzel and M. Grätzel, J. Am. Chem. Soc., 1979, 101, 7741.
11. A. Hagfeldt and M. Grätzel, Chem. Rev., 1995, 95, 49.
12. M. L. Steigerwald, A. P. Alivisatos, J. M. Gibson, T. D. Harris, R. Kortan, A. J. Muller, A. M. Thayer, T. M. Duncan, D. C. Douglass and L. E. Brus, J. Am. Chem. Soc., 1988, 110, 3046.
13. T. Trindade, P. O'Brien and X.-M. Zhang, Chem. Mater., 1997, 9, 523.
14. M. Green and P. O'Brien, Adv. Mater. Opt. Electron., 1997, 7, 277.
15. B. Ludolph, M. A. Malik, P. O'Brien and N. Revaprasadu, Chem. Commun., 1998, 1849.
16. C. B. Murray, D. J. Norris and M. G. Bawendi, J. Am. Chem. Soc., 1993, 115, 8706.
17. J. E. B. Katari, V. L. Colvin and A. P. Alivisatos, J. Phys. Chem., 1994, 98, 4109.