Title

Inverse-catalyst-effect observed for nanocrystalline-doped tin oxide sensor at lower operating temperatures

Authors

Authors

S. Shukla; L. Ludwig; C. Parrish;S. Seal

Comments

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Abbreviated Journal Title

Sens. Actuator B-Chem.

Keywords

hydrogen; indium oxide; inverse-catalyst-effect; lower operating; temperatures; sensor; sol-gel; thin films; tin oxide; GAS SENSOR; THIN-FILMS; PERFORMANCES; THICKNESS; H-2; CO; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

Abstract

Nanocrystalline In2O3-doped SnO2 thin film sensor is synthesized via sol-gel dip-coating technique. This nanocrystalline thin film is successfully utilized to sense hydrogen (H-2) gas with the concentration as low as 50 ppm at lower operating temperatures (25-100 degreesC). For short test-duration (30 min), the H-2 sensitivity of the Pt-sputtered sensor is observed to be higher than that of the non-Pt-sputtered film. An "inverse-catalyst-effect" on the H-2) gas sensitivity is, however, newly observed when the test-duration is increased to 24 h. The presence of H2O molecules, which remain adsorbed and get accumulated on the sensor surface, during the long test-duration, are primarily attributed to the reduced H-2 gas sensitivity of the Pt-sputtered sensors, relative to that of non-Pt- sputtered sensors, at lower operating temperatures (25-100 degreesC). (C) 2004 Elsevier B.V. All rights reserved.

Journal Title

Sensors and Actuators B-Chemical

Volume

104

Issue/Number

2

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

223

Last Page

231

WOS Identifier

WOS:000225384200008

ISSN

0925-4005

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