Title

Inverse-Catalyst-Effect Observed For Nanocrystalline-Doped Tin Oxide Sensor At Lower Operating Temperatures

Keywords

Hydrogen; Indium oxide; Inverse-catalyst-effect; Lower operating temperatures; Sensor; Sol-gel; Thin films; Tin oxide

Abstract

Nanocrystalline In2O3doped SnO2 thin film sensor is synthesized via sol-gel dip-coating technique. This nanocrystalline thin film is successfully utilized to sense hydrogen (H2) gas with the concentration as low as 50 ppm at lower operating temperatures (25-100°C). For short test-duration (30 min), the H2 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 H2 gas sensitivity of the Pt-sputtered sensors, relative to that of non-Pt-sputtered sensors, at lower operating temperatures (25-100°C). © 2004 Elsevier B.V. All rights reserved.

Publication Date

1-24-2005

Publication Title

Sensors and Actuators, B: Chemical

Volume

104

Issue

2

Number of Pages

223-231

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.snb.2004.05.008

Socpus ID

10644267838 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/10644267838

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