Alignment Growth Mechanisms of Rod-like ZnO on Zinc Substrates

doi:10.3724/SP.J.1077.2013.12225

Abstract

Abstract: Discontinuous films of ZnO particles were prepared on zinc substrates by air pre-oxidation process. The arrays of rod-like ZnO nano-/micro- crystals on zinc substrates were synthesized through hydrothermal processing with N₂H₄·H₂O solution. It is found that the rod-like ZnO nano-/micro-crystals align well on the substrate surface with a unique crystallographic orientation. The experimental results suggest a free alignment growth mechanism for rod-like ZnO nano-/micro-crystals on zinc substrates. The crystallization habit of ZnO nano-/micro-crystals is to grow along with the c axis fast under hydrothermal conditions, thus the well alignment of rod-like ZnO nano-/micro-crystals only depends on the state of ZnO nuclei on the substrate surface. The states of ZnO nuclei on the substrate surface with a unique crystallographic orientation well agree with others, which regulates the alignment of rod-like ZnO nano-/micro-crystals. In temperature-dependent photoluminescence spectra, the "negative thermal quenching" phenomenon of near band-gap edge excitons is observed in the temperature ranging from 30 K to 60 K, which identify two non-radiative processes and one negative thermal quenching process.

Key words: zinc oxide, zinc substrate, alignment growth mechanism, photoluminescence

CLC Number:

LIU Chang-You, WANG Jin-Fang, SUN Xiao-Yan, WANG Ze-Wen, JIE Wan-Qi. Alignment Growth Mechanisms of Rod-like ZnO on Zinc Substrates[J]. Journal of Inorganic Materials, 2013, 28(3): 301-306.

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