Growth, Characterization and Gas Sensing Properties of Nanotetrapod ZnO

被引：3

作者：

Kaur, Manmeet ^{[1
]}

Bhattacharya, Shovit ^{[1
]}

Saxena, Vibha ^{[1
]}

Aswal, D. K. ^{[1
]}

Roy, Mainak ^{[2
]}

Deshpande, S. K. ^{[3
]}

Gupta, S. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Tech Phys & Prototype Engn Div, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Div Chem, Bombay 400085, Maharashtra, India

[3] Bhabha Atom Res Ctr, Univ Grant Commiss DAE Consortium Sci Res, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2008年 / 8卷 / 08期

关键词：

Zinc Oxide; Nanotetrapods; Optical Measurements; Gas Sensor;

D O I：

10.1166/jnn.2008.AN45

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

ZnO nanotetrapods have been obtained in large quantities by carbothermal reduction of ZnO powder. These were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, UV-visible spectroscopy and photoluminescence. Electron microscopy revealed that the overall size of the tetrapods is 1.5-2 mu m and legs are 30-50 nm in diameter. The size of tetrapods as well as diameter of the legs was found to increase with deposition temperature. Photoluminescence spectra revealed that green emission originating from oxygen vacancies overwhelmed that of the near-band-edge ultraviolet peak. A band gap of 3.27 eV was calculated from optical absorption spectra which agreed well with that estimated from PL spectra. Gas sensing properties of tetrapods were investigated and these were found to be 5 times more sensitive to H2S gas at room temperature in comparison to ZnO bulk polycrystalline material.

引用

页码：4106 / 4110

页数：5

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