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Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)3384-3390
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume255
DOIs
DateAccepted/In press - 24 Sep 2017
DatePublished (current) - 1 Feb 2018

Abstract

Ultrathin two-dimensional ZnO nanosheets (NSs) with thicknesses of just a few nanometers have been fabricated by a solvothermal method. The very large surface area to volume ratio of this material translates into outstanding electrical sensing responses to ethanol (as high as S ∼ 97 to 200 ppm of ethanol at a working temperature of 320 °C). Decorating these ZnO NSs with CuO nanoparticles (NPs), by pulsed laser ablation of a CuO target at room temperature and then post-annealing at 400 °C, yields CuO-ZnO NSs that display a further up to 2-fold enhanced response to ethanol vapour, reduced sensor response and recovery times, high sensing repeatability and high selectivity. Mechanisms underpinning the enhanced sensing properties of the CuO-ZnO NSs are discussed in terms of CuO NP-induced p-n junction depletion regions and increases in the density of active sites for ethanol adsorption and for reaction with adsorbed oxygen species.

    Research areas

  • Copper oxide, Gas sensing, Nanosheet, p-n junction, Zinc oxide

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0925400517318312?via%3Dihub#! . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 684 KB, PDF-document

    Embargo ends: 1/02/19

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    Licence: CC BY-NC-ND

DOI

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