Microdroplet Based Organic Vapour Sensor on a Disposable GO-Chitosan Flexible Substrate

Bhattacharjee, M. , Vilouras, A. and Dahiya, R. (2019) Microdroplet Based Organic Vapour Sensor on a Disposable GO-Chitosan Flexible Substrate. In: IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS 2019), Glasgow, UK, 7-10 July 2019, ISBN 9781538693049 (doi:10.1109/FLEPS.2019.8792237)

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Abstract

With rising hazardous organic vapours in the environment, the detection of volatile organic vapour compounds (VOCs) is important for human safety. To this end, this paper presents a conductive droplet-based disposable sensor. Unlike conventional sensors, the droplet system is easily replaceable and is capable of detecting multiple vapours based on surface tension gradient. The response time for the presented sensing arrangement was found to be 3-4 seconds which is better than the solid-state counterparts. The chemiresistive sensor used in this work, is fabricated on 2.5 μm thick ultra-flexible graphene oxide-chitosan (GOC) bioresorbable substrate with Pt electrodes which are 60 μm apart. The presence of GO in the GOC substrate provides optimum hydrophobicity to the droplet for efficient operation. The electrostatic interaction and strong hydrogen bonds between GO and polysaccharide groups in chitosan provides tunable hydrophobicity and stability to the droplet. Moreover, biocompatibility, low-toxicity and bioresorbability of GOC substrate are highly desirable in the disposable sensing applications. With a conductive droplet of ~10 μL of aq. NaCl as an active sensing material, dispensed in-between the Pt electrodes, it was observed that the droplet shows 14-21% change in resistance in presence of VOCs.

Item Type:Conference Proceedings
Additional Information:This work was supported in part by EPSRC Centre for Doctoral Training in Intelligent Sensing and Measurement (EP/L016753/1) and European Commission through North West Centre for Advanced Manufacturing (H2020-Intereg-IVA5055).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Vilouras, Anastasios and Dahiya, Professor Ravinder and Bhattacharjee, Mr Mitradip
Authors: Bhattacharjee, M., Vilouras, A., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
ISBN:9781538693049
Copyright Holders:Copyright © 2019 IEEE
First Published:First published in Proceedings of the IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS 2019)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190828EPSRC Centre for Doctoral Training in Sensing and MeasurementAndrew HarveyEngineering and Physical Sciences Research Council (EPSRC)EP/L016753/1P&S - Physics & Astronomy

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