A two-dimensional (2D) WSe2-based binary composite for ultrasensitive trace level room temperature NH3sensing for non-invasive diagnosis

Sharma, D and Pal, A and Bhat, N (2023) A two-dimensional (2D) WSe2-based binary composite for ultrasensitive trace level room temperature NH3sensing for non-invasive diagnosis. In: 2023 IEEE Applied Sensing Conference, APSCON 2023, 23 - 25 January 2023, Bengaluru.

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Abstract

In this study, we report the synthesis of a novel WSe2-Fe3O4 hetero nanostructure (HNS) for the ultrahigh responsive ammonia (NH3) gas sensing at ambient conditions. Herein, the facile synthesis of the as-reported HNS was associated with the liquid phase exfoliation of the bulk WSe2 nanosheets followed by decoration of Fe3O4 nanoparticles (NPs) over the two-dimensional (2D) nanosheet by using the wet chemistry technique. Subsequently, the structural and chemical integrity of the HNS was investigated by using various spectroscopic and microscopic techniques, including XPS characterization and TEM analysis. After the synthesis, the heterostructure was deposited over the Inter-digitated electrode (IDE) of 5μm minimum feature size. An ultra-high response of 300,000 was achieved at 4ppmNH3 gas concentration, with a limit of detection down to lppb (response 5 at lppb), at room temperature conditions, indicating an improved device performance as compared to previous reports. Simultaneously, we recorded 283 and 519 sec of the response and recovery time, respectively, at 100 ppb gas concentration. Sensor current was stable when subjected to a repeatability test with seven cycles of 3ppmNH3 exposure. The excellent performance, demonstrated by the 2D WSe2 HNS reported here, makes it the best candidate for a low-cost sensor for a variety of applications including pollution monitoring and non-invasive disease detection.

Item Type:	Conference Paper
Publication:	APSCON 2023 - IEEE Applied Sensing Conference, Symposium Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Ammonia; Diagnosis; Nanoparticles; Nanosheets; Selenium compounds; Spectroscopic analysis; Synthesis (chemical), Ambient conditions; Binary composites; Chemiresistive; Gas concentration; Gas sensing; Hetero-nanostructures; Non-invasive diagnosis; Trace level; Two-dimensional; Ultrasensitive, Magnetite
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	15 Jun 2023 08:44
Last Modified:	15 Jun 2023 08:44
URI:	https://eprints.iisc.ac.in/id/eprint/81992

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