High-Quality ZnCdS Nanosheets Prepared Using Solvothermal Synthesis

M A Mahdi,J J Hassan,Z Hassan,S S Ng

doi:10.1155/2013/897638

M A Mahdi, J J Hassan + Show 2 more

Open Access

https://doi.org/10.1155/2013/897638

Copy DOI

Abstract

For the first time, ZnxCd1-xS nanosheets with different Zn and Cd ion concentrations were prepared using solvothermal synthesis at 200°C for 4 and 24 h. The crystalline structure of the nanosheets was wurtzite. The optical band gaps of the nanosheets increased with increasing Zn ratio; this increase is consistent with the band gaps estimated using Vegard’s formula. The photoluminescence spectra for the 24 h nanosheets had higher emission intensities than those for the 4 h nanosheets. The emission band corresponding to intrinsic near-band-edge emission and a broad peak associated with extrinsic deep-level emission were observed in the photoluminescence spectra.

Highlights

One-dimensional (1D) semiconductor nanostructures have recently become widely used because of their special properties: quantum confinement, high surface-to-volume ratio, high optical gain, fast response, and specific crystalline orientation [1,2,3]
Analysis of the crystalline structures indicated that the sheets had a hexagonal phase and that crystallinity increased as the reaction time was increased from 4 to 24 h
The preferred growth orientation of the nanosheets depended on the Zn ratio and the reaction time

Summary

Introduction

One-dimensional (1D) semiconductor nanostructures have recently become widely used because of their special properties: quantum confinement, high surface-to-volume ratio, high optical gain, fast response, and specific crystalline orientation [1,2,3]. Ternary II–VI semiconductor materials have attracted more interest than binary compounds because some of their properties, such as their tunable optical properties, are better than those of binary compounds. The tunable optical properties of ternary II–VI semiconductor materials can be controlled by appropriately adjusting the constituent mole fractions, particle sizes, and morphologies of the materials [4]. Solvothermal synthesis has received considerable attention because of the possibility of preparing high-crystallinity 1D nanostructured materials. The solvothermal method can produce high-purity nanocrystalline materials with a high degree of crystallinity compared with other solution-based methods [16]. The effect that reaction time and Zn ratio had on the morphologies, crystalline structures, and optical properties of the nanosheets was investigated

Experimental Section

Results and Discussions

Conclusions