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Carbonaceous ZnO nanocomposite for sensing of H2S at sub-ppm concentrations

Umesh, S and Usha, A and Varadharajaperumal, S and Shivashankar, SA and Srinidhi Raghavan, M (2021) Carbonaceous ZnO nanocomposite for sensing of H2S at sub-ppm concentrations. In: Fullerenes Nanotubes and Carbon Nanostructures .

Full text not available from this repository.
Official URL: https://doi.org/10.1080/1536383X.2021.1900127


The present work describes the pyrolysis of zinc acetylacetonate carried out at 700 °C in a sealed quartz tube under inert ambient conditions. The resulting carbonaceous powder material was characterised by XRD and Raman analysis, electron microscopy, X-ray photoelectron spectroscopy, and elemental analysis. These analyses reveal that nanometre-sized hexagonal wurtzite ZnO is embedded in graphitic carbon and graphite oxide, forming a nanocomposite, designated ZnO/C/GO. A pellet of ZnO/C/GO was tested as a conductometric gas sensor for detecting hydrogen sulphide (H2S). The composite shows a rapid and significant response of 220 at 150 °C to 5 ppm of H2S gas, with response and recovery time of 20 s and 30 s, respectively. The detection limit is found to be 250 ppb of H2S, with good selectivity over SO2, NO2, CH4 and ammonia. The novel way to synthesise a carbonaceous nanocomposite, its sensitivity to H2S at a relatively low temperature (implying low power consumption), and its selectivity, promise a cost-effective carbonaceous oxide composite-based sensor for H2S at ppm concentrations. © 2021 Taylor & Francis Group, LLC.

Item Type: Journal Article
Publication: Fullerenes Nanotubes and Carbon Nanostructures
Publisher: Bellwether Publishing, Ltd.
Additional Information: The copyright for this article belongs to Bellwether Publishing, Ltd.
Keywords: Ammonia; Cost effectiveness; Graphene oxide; II-VI semiconductors; Nanocomposites; Oxide minerals; Sulfur dioxide; Temperature; X ray photoelectron spectroscopy; Zinc oxide; Zinc sulfide, Ambient conditions; Conductometric gas sensors; Graphitic carbons; Hexagonal wurtzite; Low-power consumption; Oxide composites; Response and recovery time; Zinc acetylacetonate, Hydrogen sulfide
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 29 Mar 2021 05:02
Last Modified: 29 Mar 2021 05:02
URI: http://eprints.iisc.ac.in/id/eprint/68601

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