Ultra-high response ethanol sensors from fully-printed co-continuous and mesoporous tin oxide thin films

Devabharathi, N and Parasuraman, R and Umarji, AM and Dasgupta, S (2021) Ultra-high response ethanol sensors from fully-printed co-continuous and mesoporous tin oxide thin films. In: Journal of Alloys and Compounds, 865 .

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Abstract

Printed vapor and moisture sensors are essential components of the multi-sensor platforms that the pharmaceutical and food safety industries require in large quantities; however, fully-printed gas or volatile organic compounds (VOCs) sensors have rarely been reported in the literature. In this regard, we demonstrate the fabrication of high surface-to-volume ratio co-continuous mesoporous tin oxide based fully-printed chemiresistive-type ethanol gas sensors. Herein, a soft templating method that mimic evaporation induced self-assembly (EISA) process has been utilized with amphiphilic triblock co-polymer pluronic F127 (PEO106-PPO70-PEO106) as the templating agent and a low-cost swelling agent ´xylene´ as the micelle expander to obtain pore diameter in the range of 10�25 nm. The tuned pore size at this range is found optimal for high surface area and high pore volumes, at the same time. The fully-printed ethanol sensors fabricated with such mesoporous SnO2 active elements show highly selective sensitivity towards ethanol with an average response of 1050 for 100 ppm and a very short response and recovery time of 9 and 129 s, respectively. The observed high response can be attributed to the high density and easily accessible active sites and simultaneous high mobility electron transport through the well-crystalline and co-connected tin oxide ligaments. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	24 Feb 2021 10:47
Last Modified:	24 Feb 2021 10:47
URI:	http://eprints.iisc.ac.in/id/eprint/67990

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