Thin sputtered platinum films on porous membranes as working electrodes in gas sensors

In sensors with porous gas diffusion membranes, the major control of mass transport often occurs at the three phase boundary between the gas, the electrolyte and the electrocatalyst [1]. This interphase is poorly defined and difficult to control. An attempt has been made using sputter deposition to...

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Bibliographic Details
Published in:	Electrochimica acta Vol. 43; no. 21; pp. 3285 - 3291
Main Authors:	Simmonds, Michael C., Hitchman, Michael L., Kheyrandish, Hamid, Colligon, John S., Cade, Nigel J., Iredale, P.Julian
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-01-1998 Elsevier
Subjects:	Chemistry diffusion membranes Electrochemistry Electrodes: preparations and properties Exact sciences and technology General and physical chemistry Ion selective electrodes sputtered electrodes toxic gas sensors diffusion membranes sputtered electrodes toxic gas sensors Hydrogen Sulfides Porous electrode Chlorine Tetrafluoroethylene polymer Transition metal Experimental study Grain size distribution Sputtering Sulfur dioxide Thin film Ion selective electrode Pore size Platinum Carbon monoxide Gas detector Modified material
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Summary:	In sensors with porous gas diffusion membranes, the major control of mass transport often occurs at the three phase boundary between the gas, the electrolyte and the electrocatalyst [1]. This interphase is poorly defined and difficult to control. An attempt has been made using sputter deposition to make a more reproducible and controlled working electrode–gas environment. The electrodes have been tested in commercial sensors for ppm levels of CO, H 2S, SO 2 and Cl 2. All sensors showed the unexpected result of two response maxima as a function of thickness of platinum deposited. The electrochemical area of the film also showed a similar two maxima relationship. Cross-sectional SEM has been used for the analysis of the pore size distribution and the sensor response time and electrode resistance have also been measured, also as a function of electrode thickness. A simple model is proposed to explain the observed relationship. From a practical viewpoint, there is evidence that sputter deposition does allow better control of electrode structure than more traditional methods of production.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0013-4686 1873-3859
DOI:	10.1016/S0013-4686(98)00009-7