Issue 37, 2020, Issue in Progress
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RSC Advances

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

Ravindra Kumar Jha, ORCID logo ab   Aman Nanda ORCID logo a  and  Navakanta Bhat*a  

* Corresponding authors

a Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, India
E-mail: navakant@iisc.ac.in

b Nano-Bio Sensors Group, CSIR-Central Electronics Engineering Research Institute, Pilani, Rajasthan, India-333031

Abstract

A heterostructure of WS2/WO3·H2O has been prepared by partial oxidation of WS2 nanosheets by exposing bulk WS2 micron 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.

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

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Article information

DOI
https://doi.org/10.1039/D0RA02553D
Article type
Paper
Submitted
19 Mar 2020
Accepted
26 May 2020
First published
09 Jun 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 21993-22001

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

R. K. Jha, A. Nanda and N. Bhat, RSC Adv., 2020, 10, 21993 DOI: 10.1039/D0RA02553D

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