Ultrasonication assisted fabrication of a tungsten sulfide/tungstite heterostructure for ppb-level ammonia detection at room temperature

Jha, RK and Nanda, A and Bhat, N (2020) Ultrasonication assisted fabrication of a tungsten sulfide/tungstite heterostructure for ppb-level ammonia detection at room temperature. In: RSC Advances, 10 (37). pp. 21993-22001.

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Abstract

A heterostructure of WS2/WO3·H2O has been prepared by partial oxidation of WS2nanosheets by exposing bulk WS2micron powder to ultrasonic waves in a bath sonicator. The as-prepared nanomaterial was used as a sensing film in an interdigitated electrode-based gas detecting device. The device was found to be specific towards ammonia gas among a group oxidizing and reducing gases. In particular, a response of as high as 11.36-254.66 was recorded for ammonia concentrations of 50 ppb to 2 ppm with excellent repeatability and reproducibility at room temperature. The response time and recovery time of the device was found to be a few tens of seconds suggesting its practicability. A plausible mechanism based on different active sites present in the receptor film is proposed and a logical reason behind its specificity towards ammonia gas is also inferred based on the Lewis acidic centers on the nano-surfaces. Overall, this proposed nanomaterial has very high potential for practical use as a room temperature ammonia sensor. © The Royal Society of Chemistry 2020.

Item Type:	Journal Article
Publication:	RSC Advances
Publisher:	Royal Society of Chemistry
Additional Information:	Copy right for this article belongs to Royal Society of Chemistry
Keywords:	Film preparation; Nanostructured materials; Sulfur compounds; Tungsten compounds; Ultrasonic applications, Ammonia concentrations; Ammonia detection; Inter-digitated electrodes; Lewis acidic centers; Partial oxidations; Plausible mechanisms; Reproducibilities; Ultra-sonication, Ammonia
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Dec 2020 09:55
Last Modified:	03 Dec 2020 09:55
URI:	http://eprints.iisc.ac.in/id/eprint/65926

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