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

Xiao Liu; Ye Sun; Miao Yu; Yongqi Yin; Baosheng Du; Wei Tang; Tingting Jiang; Bin Yang; Wenwu Cao; Michael N.R. Ashfold

doi:10.1016/j.snb.2017.09.165

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

Xiao Liu, Ye Sun^*, Miao Yu, Yongqi Yin, Baosheng Du, Wei Tang, Tingting Jiang, Bin Yang, Wenwu Cao, Michael N.R. Ashfold

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal)

30 Citations (Scopus)

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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.

Original language	English
Pages (from-to)	3384-3390
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	255
Early online date	1 Feb 2018
DOIs	https://doi.org/10.1016/j.snb.2017.09.165
Publication status	Published - 1 Feb 2018

Keywords

Copper oxide
Gas sensing
Nanosheet
p-n junction
Zinc oxide

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Liu, X., Sun, Y., Yu, M., Yin, Y., Du, B., Tang, W., Jiang, T., Yang, B., Cao, W., & Ashfold, M. N. R. (2018). Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles. Sensors and Actuators, B: Chemical, 255, 3384-3390. https://doi.org/10.1016/j.snb.2017.09.165

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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.",

keywords = "Copper oxide, Gas sensing, Nanosheet, p-n junction, Zinc oxide",

author = "Xiao Liu and Ye Sun and Miao Yu and Yongqi Yin and Baosheng Du and Wei Tang and Tingting Jiang and Bin Yang and Wenwu Cao and Ashfold, {Michael N.R.}",

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Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles. / Liu, Xiao; Sun, Ye; Yu, Miao; Yin, Yongqi; Du, Baosheng; Tang, Wei; Jiang, Tingting; Yang, Bin; Cao, Wenwu; Ashfold, Michael N.R.

In: Sensors and Actuators, B: Chemical, Vol. 255, 01.02.2018, p. 3384-3390.

Research output: Contribution to journal › Article (Academic Journal)

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AU - Yu, Miao

AU - Yin, Yongqi

AU - Du, Baosheng

AU - Tang, Wei

AU - Jiang, Tingting

AU - Yang, Bin

AU - Cao, Wenwu

AU - Ashfold, Michael N.R.

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AB - 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.

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