TY - JOUR
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 - 2018/2/1
Y1 - 2018/2/1
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.
KW - Copper oxide
KW - Gas sensing
KW - Nanosheet
KW - p-n junction
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=85030570081&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2017.09.165
DO - 10.1016/j.snb.2017.09.165
M3 - Article (Academic Journal)
AN - SCOPUS:85030570081
VL - 255
SP - 3384
EP - 3390
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
SN - 0925-4005
ER -