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Low power gas sensor array on flexible acetate substrate

Benedict, Samatha and Basu, Palash Kumar and Bhat, Navakanta (2017) Low power gas sensor array on flexible acetate substrate. In: JOURNAL OF MICROMECHANICS AND MICROENGINEERING, 27 (7).

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Official URL: http://doi.org/10.1088/1361-6439/aa71de


In this paper, we present a novel approach of fabricating a low-cost and low power gas sensor array on flexible acetate sheets for sensing CO, SO2, H-2 and NO2 gases. The array has four sensor elements with an integrated microheater which can be individually controlled enabling the monitoring of four gases. The thermal properties of the microheater characterized by IR imaging are presented. The microheater with an active area of 15 mu m x 5 mu m reaches a temperature of 300 degrees C, consuming 2 mW power, the lowest reported on flexible substrates. A sensing electrode is patterned on top of the microheater, and a nanogap (100 nm) is created by an electromigration process. This nanogap is bridged by four sensing materials doped with platinum, deposited using a solution dispensing technique. The sensing material characterization is completed using energy dispersive x-ray analysis. The sensing characteristics of ZnO for CO, V2O5 for SO2, SnO2 for H-2 and WO3 for NO2 gases are studied at different microheater voltages. The sensing characteristics of ZnO at different bending angles is also studied, which shows that the microheater and the sensing material are intact without any breaking upto a bending angle of 20 degrees. The ZnO CO sensor shows sensitivity of 146.2% at 1 ppm with good selectivity.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 07 Dec 2017 09:38
Last Modified: 07 Dec 2017 09:38
URI: http://eprints.iisc.ac.in/id/eprint/58401

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