In:
Journal of the American Ceramic Society, Wiley, Vol. 74, No. 6 ( 1991-06), p. 1325-1330
Abstract:
α‐Alumina films formed by anodic spark deposition in the melt of NaHSO 4 ‐KHSO 4 mixture (200°C) exhibited a porous structure. It has been found that the porosity and amount of α‐phase varied with anodic current density. By electrical measurements, films were found to exhibit a continuous open‐pore structure, causing failure of humidity sensors. This problem can be overcome by reanodization of the anodicspark‐deposited alumina films in either borax aqueous solution or sulfuric acid solution for a short time to form an effective barrier layer at the pore base. The modified anodic‐spark‐deposited alumina films showed highly sensitive response to water vapor change in the range of −76° to +20°C dew point with much improved long‐term stability. The humidity characteristics of the α‐alumina films were qualitatively explained in terms of the BET theory and condensation theory.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.1991.74.issue-6
DOI:
10.1111/j.1151-2916.1991.tb04106.x
Language:
English
Publisher:
Wiley
Publication Date:
1991
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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