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Research Article | Open Access

Polymer optimization for the development of low-cost moisture sensor based on nanoporous alumina thin film

Manju PANDEYa, Prabhash MISHRAa, Debdulal SAHAb, S. S. ISLAMa,*( )
Nano-Sensor Research Laboratory, F/O Engineering and Technology, Jamia Millia Islamia (Central University), New Delhi, India
Sensors and Actuators Division, Central Glass & Ceramic Research Institute, 196 Raja S. C. Mullick Road, Kolkata 700032, India
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Abstract

Sol–gel processed alumina (Al2O3) thin film has been investigated for sensing moisture. The sensor was based on ordered nanoporous Al2O3 thin film, which consisted of gold electrodes on both sides of the film forming parallel plate capacitor. Alumina substrate was used for supporting thin film moisture sensor. Hydrophilicity was achieved by controlling the surface energy of the substrate and polymer (polyvinyl alcohol (PVA)) optimization was done for developing rigid thin film over it. A high change in capacitance was observed as the moisture level increased from 5 ppmV to 500 ppmV. Scanning electron microscopy (SEM) results revealed that pores were distributed uniformly throughout the sample, which enhanced the adsorption of water molecule over the film. X-ray diffraction (XRD) study clearly confirmed the gamma (γ) phase of alumina thin film. It was found that the sensitivity of our sensor was suitable for commercial application.

Keywords

sol–geldip-coatingnanoporouspolyvinyl alcohol (PVA)hydrophilicitymoisture sensor

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Journal of Advanced Ceramics
Volume 2 Issue 4,
December 2013
Pages 341-346
DOI: 10.1007/s40145-013-0081-x
Cite this article:
PANDEY M, MISHRA P, SAHA D, et al. Polymer optimization for the development of low-cost moisture sensor based on nanoporous alumina thin film. Journal of Advanced Ceramics, 2013, 2(4): 341-346. https://doi.org/10.1007/s40145-013-0081-x

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Received: 18 July 2013
Revised: 16 August 2013
Accepted: 26 August 2013
Published: 04 December 2013
© The author(s) 2013

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
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