中国物理B ›› 2016, Vol. 25 ›› Issue (2): 27307-027307.doi: 10.1088/1674-1056/25/2/027307

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Controllable synthesis of ultrathin vanadium oxide nanobelts via an EDTA-mediated hydrothermal process

Yu-Xiang Qin(秦玉香), Cheng Liu(刘成), Wei-Wei Xie(谢威威), Meng-Yang Cui(崔梦阳)   

  1. School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China
  • 收稿日期:2015-08-08 修回日期:2015-10-01 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Yu-Xiang Qin E-mail:qinyuxiang@tju.edu.cn,qyxtj@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61274074, 61271070, and 61574100).

Controllable synthesis of ultrathin vanadium oxide nanobelts via an EDTA-mediated hydrothermal process

Yu-Xiang Qin(秦玉香), Cheng Liu(刘成), Wei-Wei Xie(谢威威), Meng-Yang Cui(崔梦阳)   

  1. School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China
  • Received:2015-08-08 Revised:2015-10-01 Online:2016-02-05 Published:2016-02-05
  • Contact: Yu-Xiang Qin E-mail:qinyuxiang@tju.edu.cn,qyxtj@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61274074, 61271070, and 61574100).

摘要: Ultrathin VO2 nanobelts with rough alignment features are prepared on the induction layer-coated substrates by an ethylenediaminetetraacetic acid (EDTA)-mediated hydrothermal process. EDTA acts as a chelating reagent and capping agent to facilitate the one-dimensional (1D) preferential growth of ultrathin VO2 nanobelts with high crystallinities and good uniformities. The annealed induction layer and concentration of EDTA are found to play crucial roles in the formation of aligned and ultrathin nanobelts. Variation in EDTA concentration can change the VO2 morphology of ultrathin nanobelts into that of thick nanoplates. Mild annealing of ultrathin VO2 nanobelts at 350 ℃ in air results in the formation of V2O5 nanobelts with a nearly unchanged ultrathin structure. The nucleation and growth mechanism involved in the formations of nanobelts and nanoplates are proposed. The ethanol gas sensing properties of the V2O5 nanobelt networks-based sensor are investigated in a temperature range from 100 ℃ to 300 ℃ over ethanol concentrations ranging from 3 ppm to 500 ppm. The results indicate that the V2O5 nanobelt network sensor exhibits high sensitivity, good reversibility, and fast response-recovery characteristics with an optimal working temperature of 250 ℃.

关键词: semiconductors, nanobelt, crystal growth, gas sensor

Abstract: Ultrathin VO2 nanobelts with rough alignment features are prepared on the induction layer-coated substrates by an ethylenediaminetetraacetic acid (EDTA)-mediated hydrothermal process. EDTA acts as a chelating reagent and capping agent to facilitate the one-dimensional (1D) preferential growth of ultrathin VO2 nanobelts with high crystallinities and good uniformities. The annealed induction layer and concentration of EDTA are found to play crucial roles in the formation of aligned and ultrathin nanobelts. Variation in EDTA concentration can change the VO2 morphology of ultrathin nanobelts into that of thick nanoplates. Mild annealing of ultrathin VO2 nanobelts at 350 ℃ in air results in the formation of V2O5 nanobelts with a nearly unchanged ultrathin structure. The nucleation and growth mechanism involved in the formations of nanobelts and nanoplates are proposed. The ethanol gas sensing properties of the V2O5 nanobelt networks-based sensor are investigated in a temperature range from 100 ℃ to 300 ℃ over ethanol concentrations ranging from 3 ppm to 500 ppm. The results indicate that the V2O5 nanobelt network sensor exhibits high sensitivity, good reversibility, and fast response-recovery characteristics with an optimal working temperature of 250 ℃.

Key words: semiconductors, nanobelt, crystal growth, gas sensor

中图分类号:  (Elemental semiconductors)

  • 73.61.Cw
91.67.Jk (Geochemistry of hydrothermal systems) 68.35.B- (Structure of clean surfaces (and surface reconstruction)) 61.72.up (Other materials)