Quick single-step mechanosynthesis of ZnO nanorods and their optical characterization: milling time dependence

被引：23

作者：

Dhara S. ^{[1
]}

Giri P.K. ^{[1
,2
]}

机构：

[1] Department of Physics, Indian Institute of Technology Guwahati, Guwahati

[2] Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati

来源：

Applied Nanoscience | 2011年 / 1卷 / 4期

关键词：

Photoluminescence; Raman; Single-step mechanosynthesis; ZnO Nanorods;

D O I：

10.1007/s13204-011-0026-z

中图分类号：

学科分类号：

摘要：

We report on the growth of ZnO nanorods (NRs) by a quick single-step mechanochemical process and investigated the milling time dependence on the structural and optical properties of the ZnO NRs. Mechanochemical reactions are carried out in a planetary ball mill for the time durations ranging from 30 min to 5 h. XRD and TEM studies revealed wurtzite structure of the as-grown ZnO NRs with length of several hundreds of nanometers to few micrometers after 30 min of reaction. Average diameter of the as-grown ZnO NRs decreases from 40 to 15 nm with increasing reaction time. Micro-Raman spectra show redshift in the characteristic Raman modes, indicating presence of milling induced strain. As-grown NRs show blueshift in the excitonic absorption peak with increasing milling time due to decrease in size and induced strain. Room temperature photoluminescence (PL) spectra show strong band-edge related UV emission and other three major emission peaks, two in the UV-blue region and one at the visible region. Post-growth annealing of the as-grown ZnO NRs completely eliminates the defect related visible PL band. Low-temperature PL studies show an additional sharp peak related to donor-bound excitonic transition, revealing the n-type nature of the as-grown NRs. © 2011, The Author(s).

引用

页码：165 / 171

页数：6

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