Open Access Nano Express

Enhanced band-edge photoluminescence from ZnO-passivated ZnO nanoflowers by atomic layer deposition

Zhi Wei Ai, Yun Wu, Hao Wu*, Ti Wang, Chao Chen, Yang Xu and Chang Liu*

Author Affiliations

Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, People’s Republic of China

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Nanoscale Research Letters 2013, 8:105  doi:10.1186/1556-276X-8-105

Published: 25 February 2013

Abstract

The ZnO nanoflowers were synthesized by reactive vapor deposition. A secondary nucleation in the stalk/leaves interface was suggested. The photoluminescence revealed that there were many oxygen vacancies in the nanoflowers. To tune the optical properties of ZnO nanoflowers, ZnO thin films with varying thicknesses were coated on the nanoflowers by atomic layer deposition, which can distinctly improve the band-edge photoluminescence properties.

Keywords:
ZnO nanoflowers; Atomic layer deposition; Photoluminescence; 77.55.hf; 73.63.Bd; 73.40.Kp