« Previous AbstractMultilocus Phylogeography of the Tuber mesentericum Complex Unearths Three Highly Divergent Cryptic Species    Next AbstractAerobic granulation utilizing fermented municipal wastewater under low pH and alkalinity conditions in a sequencing batch reactor »

Sensors (Basel)

Title:		A Langasite Crystal Microbalance Coated with Graphene Oxide-Platinum Nanocomposite as a Volatile Organic Compound Sensor: Detection and Discrimination Characteristics
Author(s):		Leong A; Saha T; Swamy V; Ramakrishnan N;
Address:		"Discipline of Electrical and Computer Systems Engineering, School of Engineering, Monash University Malaysia, Bandar Sunway 47500, Selangor, Malaysia. Discipline of Mechanical Engineering, School of Engineering, Monash University Malaysia, Bandar Sunway 47500, Selangor, Malaysia"
Journal Title:		Sensors (Basel)
Year:		2020
Volume:		20200107
Issue:		2
Page Number:		-
DOI:		10.3390/s20020334
ISSN/ISBN:		1424-8220 (Electronic) 1424-8220 (Linking)
Abstract:		"We propose a novel langasite crystal microbalance (LCM) sensor with a graphene-based sensing medium to detect and discriminate volatile organic compounds (VOCs) at room temperature. A thin film of graphene oxide embedded with Pt nanostructures (GO-Pt nanocomposite) was deposited on the electrode surface of the LCM, a thickness-shear acoustic wave resonator. Ethyl acetate, acetic acid, and ethanol were chosen as typical VOCs for this study. Sensitivity and selectivity of coated LCM were investigated for different concentrations of the VOCs by analysing the resonant properties of the sensor. When exposed to VOCs, a negative shift in series resonance frequency was observed due to the mass loading of VOC molecules. Simultaneously, changes in equivalent resistance and parallel resonance frequency of the sensor were also observed due to the interaction of VOCs with charge carriers on the GO-Pt nanocomposite film surface. This dual measurement of both series and parallel resonance frequencies allowed for detection and discrimination of VOCs. Moreover, the high thermal stability of langasite makes the proposed sensor suitable even for harsh environmental conditions"
Keywords:		VOCs acoustic sensor gas sensor graphene oxide thickness shear mode resonator;
Notes:		"PubMed-not-MEDLINELeong, Ainan Saha, Tridib Swamy, Varghese Ramakrishnan, Narayanan eng FRGS/1/2017/STG02/MUSM/02/5/Ministry of Higher Education (MOHE), Malaysia under Fundamental Research Grant Scheme (FRGS) Grant/ Switzerland 2020/01/16 Sensors (Basel). 2020 Jan 7; 20(2):334. doi: 10.3390/s20020334"