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Freeze-drying synthesis and optical properties of nanocrystalline ZnO/SnO2 composites

HUAMING YANG1,* , SHA NIE1

Affiliation

  1. Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract

Freeze-drying is a convenient cryochemical powder processing method. In this paper, a novel freeze-drying process was employed to prepare nanosized ZnO/SnO2 composites with different Zn/Sn molar ratio. X-ray diffraction (XRD) and transmission electronic microscopy (TEM) were used to characterize structure and morphology of the samples. Phases of the Z2S1 (Zn/Sn=2) sample calcined at 700°C are ZnO and SnO2, while Z1S1 (Zn/Sn=1) and Z1S2 (Zn/Sn=0.5) samples showed peak characteristic of Zn2SnO4, which means that excessive SnO2 is favorable for the formation of Zn2SnO4. The band gap observed by ultraviolet-visible (UV-vis) spectroscopy showed that ZnO/SnO2 composites can be excited by the photons with the wavelength under 418 nm and produces the electron/hole pairs. The ZnO/SnO2 composites indicated enhanced room-temperature photoluminescence (PL) property with about 4 times of pure ZnO nanoparticles, indicating potential application in optoelectronic devices..

Keywords

ZnO/SnO2 nanocomposites, Freeze-drying synthesis, Microstructure, Optical property.

Submitted at: Nov. 26, 2007
Accepted at: Jan. 18, 2008

Citation

HUAMING YANG, SHA NIE, Freeze-drying synthesis and optical properties of nanocrystalline ZnO/SnO2 composites, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 1, pp. 197-200 (2008)