Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (04): 874-880.doi: 10.3866/PKU.WHXB201302045

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Porous ZnO Sheets Transformed from Zinc Sulfate Hydroxide Hydrate and Their Photoluminescence Performance

HE Peng1,2, GAO Xiang-Dong1, WU Li-Bin3, JIANG Zheng-Wu4, WANG Cai-Lu1,2, LI Xiao-Min1   

  1. 1 State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;
    2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    3 Shanghai Research Institute of Petrochemical Technology, Shanghai 200137, P. R. China;
    4 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, P. R. China
  • Received:2012-11-07 Revised:2013-02-04 Published:2013-03-25
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2009CB623304, 2011CB013805) and National Natural Science Foundation of China (51072214, 51002174).

Abstract:

Highly crystalline, porous ZnO sheets were prepared from chemically-deposited zinc sulfate hydroxide hydrate (ZSH) sheets by sintering at 1000 ℃. The formation mechanism of ZSH in Zn2+- hexamethyltetramine (HMT) precursor system, the transformation process of ZSH to ZnO, and the crystalline, microstructural and optical properties of the ZnO sheets were investigated. The porous ZnO sheets possessed a well-defined hexagonal shape with controllable size (10-50 μm) and thickness (200-500 nm), high crystallinity, and strong ultraviolet photoluminescence without detectable defectrelated visible emission. Submicron-sized pores (100-500 nm) and polygonal or irregular ZnO particles resulting from the limited mass transport during high temperature sintering were observed in the ZnO sheets. Analysis of the formation mechanism indicated that the high affinity of SO42- for Zn2+ was responsible for the formation of ZSH in the Zn2+-HMT precursor system, and the thermolysis of ZSH affected the morphology and microstructure of the ZnO sheets. This work reveals a facile route to porous ZnO nanostructures with good crystallinity and optical properties, which make them suitable for application in catalysis, and photo and/or electrical devices.

Key words: ZnO, Porous sheet, Zinc sulfate hydroxide hydrate, Photoluminescence

MSC2000: 

  • O649