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

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

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 (US)
Pages (from-to)	3384-3390
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	255
DOIs	https://doi.org/10.1016/j.snb.2017.09.165
State	Published - Feb 2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1016/j.snb.2017.09.165

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@article{b3d9968ddcd34f56b81e8d06dd931ae7,

title = "Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles",

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.",

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.\}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = feb,

doi = "10.1016/j.snb.2017.09.165",

language = "English (US)",

volume = "255",

pages = "3384--3390",

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T1 - Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles

AU - Liu, Xiao

AU - Sun, Ye

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.

PY - 2018/2

Y1 - 2018/2

N2 - 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.

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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SN - 0925-4005

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JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

ER -

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

Abstract

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