High-sensitivity hydrocarbon sensors based on tungsten oxide nanowires

被引：85

作者：

Rout, Chandra Sekhar

Govindaraj, A.

Rao, C. N. R.

机构：

[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, DST Unit Nanosci, Bangalore 560064, Karnataka, India

[2] Jawaharlal Nehru Ctr Adv Sci Res, CSIR, Ctr Excellence Chem, Bangalore 560064, Karnataka, India

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2006年 / 16卷 / 40期

关键词：

D O I：

10.1039/b607012b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydrocarbon ( LPG) sensors based on the nanostructures of V2O5 do not exhibit satisfactory characteristics, while sensors based on WO2.72 nanowires show high sensitivity ( similar to 1800) for 2000 ppm of LPG at 200 degrees C as well as relatively short recovery and response times. Impregnation of WO2.72 nanowires with Pt in the 0.1 - 1.0 at% range, significantly improves the sensor characteristics, the sensitivity increasing with Pt concentration and reaching a value of similar to 10(6) for 2000 ppm of LPG in the 100 - 200 degrees C range with 1 at% Pt. The sensitivity remains high even for 50 ppm of LPG, and is not affected significantly by repeated cycles or humidity. The mechanism of sensing of hydrocarbons by WO2.72 nanowires is explained on the basis of adsorbed oxygen species.

引用

页码：3936 / 3941

页数：6

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