Piezopotential-Induced Schottky Behavior of Zn1−xSnO3 Nanowire Arrays and Piezophotocatalytic Applications

Ya Ting Wang, Kao Shuo Chang

研究成果: Article同行評審

35 引文 斯高帕斯(Scopus)

摘要

This article presents the piezotronic- and piezophototronic effect-enhanced photocatalysis (piezophotocatalysis) of Zn1−xSnO3 (ZTO) nanowires fabricated through a two-step hydrothermal reaction. The highlights of this research include (1) tailoring hydrothermal synthesis parameters to obtain well-aligned LN-type single-crystalline ZTO nanowire arrays; (2) exploring the piezopotential-driven piezotronic and piezophototronic effects of ZTO nanowires; (3) identifying Schottky barrier height variations; and (4) exploiting synergistic piezophotocatalysis for decomposing methylene blue (MB). Transmission electron microscopy, electron probe energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy analyses reveal highly crystalline Zn-deficient ZTO nanowires. The band gap is estimated to be approximately 3.8 eV. The ZTO nanowires exhibit piezopotential-modulated piezotronic and piezophototronic effects. The corresponding Schottky barrier height variation is calculated using thermionic emission-diffusion theory. The calculated photodegradation rate constant k of the sample, under pressure from ultrasonic vibration and a piece of glass, is approximately 1.5 × 10−2 min−1, approximately four times higher than that of ZTO nanowires in the absence of stress. The observed synergistic piezophotocatalysis is attributed to (1) band bending of ZTO nanowires; (2) application of alternating ultrasonic vibration; (3) MB mass transfer enhancement; and (4) abundant active reaction sites generated from ZTO nanowire surface sweeping.

原文English
頁(從 - 到)2593-2600
頁數8
期刊Journal of the American Ceramic Society
99
發行號8
DOIs
出版狀態Published - 2016

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 材料化學

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