The role of stoichiometry of indium and oxygen on gas sensing properties of indium oxide nanostructures

被引：14

作者：

Kumar, Mukesh ^{[1
]}

Mehta, B. R. ^{[1
]}

Singh, V. N. ^{[1
]}

Chatterjee, R. ^{[2
]}

Milikisiyants, S. ^{[2
]}

Lakshmi, K. V. ^{[2
]}

Singh, J. P. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys, New Delhi 110016, India

[2] Rensselaer Polytech Inst, Dept Chem & Chem Biol, Baruch Ctr Biochem Solar Energy Res 60, Troy, NY 12180 USA

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 12期

关键词：

crystal growth from vapour; Debye temperature; evaporation; gas sensors; indium compounds; nanotubes; nanowires; stoichiometry; IN2O3; SIZE;

D O I：

10.1063/1.3371717

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report direct evidence of the role of stoichiometry of one-dimensional indium oxide (IO) nanostructures grown by vapor-phase evaporation method on the ethanol gas sensing properties. The stoichiometric crystalline In2O3 nanowires grown under oxidizing (water) ambient exhibit about two orders of magnitude higher sensor response value of 281 in comparison to nonstoichiometric (In/O similar to 0.75) nanotubes grown under reducing (ethanol) ambient in presence of 1000 ppm ethanol gas at 300 degrees C. We propose that for a stoichiometric IO nanowire, Debye region completely depletes the nanowire from free charge carriers which results in a significant increase in the sensor response.

引用

页数：3

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