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Title: Characterisation and humidity-sensing properties of aluminium (oxy)-hydroxide films prepared by cathodically induced precipitation
Authors: Mortimer, Roger J.
Mayes, Russell J.
Keywords: Humidity sensor
Aluminium (oxy)-hydroxide
Sensing properties
Issue Date: 2007
Publisher: © Elsevier B.V.
Citation: MORTIMER, R.J. and MAYES, R.J., 2007. Characterisation and humidity-sensing properties of aluminium (oxy)-hydroxide films prepared by cathodically induced precipitation. Sensors and Actuators B: Chemical, 128 (1), pp. 124 - 132.
Abstract: Cathodically-induced precipitated aluminium (oxy)-hydroxide films, prepared using hydrogen-sorbing palladium electrodes, have been characterised and their humidity-sensing electrical properties studied. Infrared (IR) spectroscopy demonstrated that the films are hygroscopic, and this property allows their use as the active component in a humidity sensor. Films formed as bridging precipitates between twin palladium electrodes were tested for electrical parameter response to relative humidity changes. A linear correlation with impedance is obtained on application of a 100 mV applied ac signal amplitude at 1 kHz. The linearity of response is comparable to commercial sensors. Cathodically-induced precipitate films contain 24 wt% aluminium and 10 wt% sulfate, the balance being oxygen and hydrogen. As-deposited films are amorphous, but change to a crystalline form after heat treatment at high temperature. XRD patterns taken as films are heated reveal transformation into γ- Al2O3, followed by production of α-Al2O3 at temperatures greater than 1100°C. An electrochemical quartz crystal nanobalance (EQCN) study demonstrated that dissolution of the precipitate is possible at positive potentials, cycling to which allows film compaction.
Description: This article was published in the journal, Sensors and Actuators B: Chemical [© Elsevier B.V.] and the definitive version is available at: http://dx.doi.org/10.1016/j.snb.2007.05.040
Version: Accepted for publication
DOI: 10.1016/j.snb.2007.05.040
URI: https://dspace.lboro.ac.uk/2134/11425
Publisher Link: http://dx.doi.org/10.1016/j.snb.2007.05.040
ISSN: 0925-4005
Appears in Collections:Published Articles (Chemistry)

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