Facile green synthesis of 2D hexagonal MoO3 for selective detection of ammonia at room temperature

Sakhuja, N and Jha, R and Bhat, N (2021) Facile green synthesis of 2D hexagonal MoO3 for selective detection of ammonia at room temperature. In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 271 .

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Abstract

A facile green synthesis of 2D MoO3 has been demonstrated for detection of ammonia at room temperature. The bulk MoO3 was exfoliated in water via ultrasonication assisted liquid exfoliation technique. Interestingly, the resulting MoO3 nanosheets exhibited metastable hexagonal phase unlike the base material (orthorhombic (α) MoO3), as confirmed by different characterization techniques. The phase stability has been confirmed by annealing studies and Thermo-gravimetric analysis (TGA) and the complete transformation back to α-MoO3 was observed at 300 °C. The phase transformation has been attributed to the intercalation of water molecules in the 2D layers of MoO3. The dispersion in organic solvents like ethanol further proves this argument as no phase transformation was observed in the later. The exfoliated hexagonal MoO3 based devices responded fairly well towards ammonia in the concentration range of 0.3 ppm to 5 ppm at room temperature and also superior to the ones prepared in Ethanol medium. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Chemical sensors; Ethanol; Exfoliation (materials science); Gas detectors; Molecules; Molybdenum oxide; Organic solvents; Phase transitions; Thermogravimetric analysis, 2d; 2D-hexagonal; Gas-sensors; Green synthesis; Liquid exfoliations; Metastables; MoO-3; Phases transformation; Selective detection; Ultra-sonication, Ammonia
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	07 Oct 2021 15:54
Last Modified:	07 Oct 2021 15:54
URI:	http://eprints.iisc.ac.in/id/eprint/69652

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