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Hydrothermal; UV illumination; ZnO nanoplate; ethanol vapour sensing.

ZnO nanoplates with hexagonal wurtzite structure were synthesized by hydrothermal treatment. The averagedimension and average thickness of the plates were $\sim 200 \times 400$ and 40 nm, respectively. ZnO nanoplates were deposited on Pt-interdigitated electrodes for the fabrication of gas-sensing devices. The ethanol-sensing properties of the devices were investigated in the dark vs. ultraviolet (UV) illumination. Under the UV illumination, the optimal operating temperature of the devices can be reduced from 237 to 164$^{\circ}$C and the response of the device was increased from 2.8 to 8.5 towards 1500 ppm ethanol vapour.

LUONG HUU PHUOC¹ DO DUC THO¹ NGUYEN TIEN DUNG¹ VU XUAN HIEN¹ DANG DUC VUONG¹ NGUYEN DUC CHIEN¹

1. School of Engineering Physics, Hanoi University of Science and Technology, Hanoi 112 400, Vietnam

Published

15 April 2019

Manuscript received

28 March 2018

Accepted

5 September 2018