Hydrothermal Preparation and Optical Absorption of ZnSe Nanocrystals

Abstract

ZnSe nanocrystals were prepared directly by a hydrothermal method in with Zn and Se powders were taken as the starting materials. The formation reactions of ZnSe nanocrystals is a reductive process by hydrogen in the alkaline solutions in an autoclave. The ZnSe nanoparticles were the pure cubic phase with the molar ratio of Zn : Se being close to unity. The optical absorption of ZnSe nanoparticles was measured by UV-vis spectrometer. The band edge was a steep at wavelength below 446 nm, and the energy gap was estimated 2.66 eV higher than bulk ZnSe for the quantum size effect.

Keywords:

• Hydrothermal method
• ZnSe
• nanocrystals

Acknowledgments

This work was supported by the Ministry of Sciences and Technology of China through the 973-project under grant 2002CB613305, the Nature Science Foundation of Shannxi Province (2003E110) and Xi'an Science and Technology developing Project (GG05040).