TiN in work function type sensors: a stable ammonia sensitive material forroom temperature operation with low humidity cross sensitivity

Citation
B. Ostrick et al., TiN in work function type sensors: a stable ammonia sensitive material forroom temperature operation with low humidity cross sensitivity, SENS ACTU-B, 68(1-3), 2000, pp. 234-239
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
SENSORS AND ACTUATORS B-CHEMICAL
ISSN journal
0925-4005 → ACNP
Volume
68
Issue
1-3
Year of publication
2000
Pages
234 - 239
Database
ISI
SICI code
0925-4005(20000825)68:1-3<234:TIWFTS>2.0.ZU;2-G
Abstract
In this work, it was found that exposure of TIN to ammonia (400 ppb-100 ppm ) in wet synthetic air at room temperature leads to a reversible decrease o f Delta Phi. Then is a change of the work function of -30 meV/decade of inc reasing ammonia concentration at room temperature. The response time (t(90) ) to 1 ppm is less than or equal to 1 min. The sensitivity is a typical roo m temperature effect as it decreases at higher temperatures up to 100 degre es C. The reaction has a low cross sensitivity to humidity, as - first - th e sensitivity to ammonia does not depend on the relative humidity and - sec ond - the work function change due to humidity changes is as low as -2 meV for an increase of 10% in relative humidity. The Diffuse Reflectance Infrar ed Fourier Transform Spectra (DRIFT-spectra) indicate that the adsorption o f ammonia is correlated with a decrease of OH species on the surface. All d ata are compared to the gas reactions of TiO2. (C) 2000 Elsevier Science S. A. All rights reserved.