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Publication - Miss Xiao Liu

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

    Citation

    Liu, X, Sun, Y, Yu, M, Yin, Y, Du, B, Tang, W, Jiang, T, Yang, B, Cao, W & Ashfold, MN, 2018, ‘Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles’. Sensors and Actuators, B: Chemical, vol 255., pp. 3384-3390

    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.

    Full details in the University publications repository