高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (6): 1152.doi: 10.7503/cjcu20170517

• 研究论文: 无机化学 • 上一篇    下一篇

Pt修饰TiO2纳米管的接触势与光电性能

翁晴1, 李静玲1(), 廖薇1, 余华梁2, 余巧莺1   

  1. 1. 福建工程学院生态环境与城市建设学院, 福州 350108
    2. 闽江学院物理学与电子信息工程系, 福州 350108
  • 收稿日期:2017-07-31 出版日期:2018-06-10 发布日期:2018-05-24
  • 基金资助:
    福建省科技项目(批准号: 2016H6003, 2017J01770)、 福建省自然基金和福州市自然基金项目(批准号: 2016G71)和福建工程学院科研项目(批准号: GY-Z16041, GY-Z16042, GY-H17064)资助.

Contact Potential Barriers and Photoelectric Properties of Pt-TiO2 Nanotubes

WENG Qing1, LI Jingling1,*(), LIAO Wei1, YU Hualiang2, YU Qiaoying1   

  1. 1. College of Eco-environment and Urban-construction, Fujian University of Technology, Fuzhou 350108, China
    2. Department of Physics and Electronic, Minjiang University, Fuzhou 350108, China
  • Received:2017-07-31 Online:2018-06-10 Published:2018-05-24
  • Contact: LI Jingling E-mail:ljl118@163.com
  • Supported by:
    † Supported by the Natural Science Foundation of Fujian Province, China(Nos. 2016H6003, 2017J01770), the Natural Science Foundation of Fuzhou, China(No. 2016G71) and the Science and Research Project of Fujian University of Technology, China(Nos. GY-Z16041, GY-Z16042, GY-H17064).

摘要:

采用碱熔-水热法在常压下制备了Pt修饰TiO2复合纳米管(Pt-TNT), 并对其微观组织形貌和性能进行了表征. 结果表明, Pt-TNT 主要由锐钛矿相和金红石相TiO2组成, 铂和氧化铂(Pt, PtO, PtO2, 记作PtOxδ+)分散在TiO2纳米管表面. Pt-TNT表面接触势为PtOxδ+-锐钛矿-金红石-PtOxδ+类型, Pt-TNT比表面积(BET)由原料的9.0 m2/g增至41 m2/g, 增加3.55倍. 傅里叶变换红外(FTIR)光谱中1047与1641 cm-1处的OH弯曲振动峰是由Pt-TNT样品表面吸附δ-H2O所致. 表面光电压分析显示TiO2表面光伏响应红移, 在外电场作用下深能级上的束缚激子由带-带跃迁变为亚带隙跃迁.

关键词: Pt修饰, TiO2纳米管, 光电特性, 接触势

Abstract:

Composite TiO2 nanotubes of Pt-modified(Pt-TNT) were synthesized via alkaline fusion-hydrothermal method under ambient atmosphere pressure. The microstructure morphology and properties of Pt-TNT were characterized. Composition analysis showed that the particulate matters on surface of Pt-TNT were composed of platinum and platinum oxides(Pt, PtO and PtO2, PtOxδ+). Contact potential barriers consisting of PtOxδ+-anatase-rutile-PtOxδ+ are presumed to form upon PtOxδ+ particle that deposited on the surface of Pt-TNT. The result of XRD indicated that a mixture of anatase and rutile phases prevailed in Pt-TNT. The 1047 and 1641 cm-1(OH bending vibration) of FTIR were caused by the adsorption of δ-H2O on the surface of Pt-TNT. Surface photovoltage spectroscopy(SPS) and electric field-induced surface photovoltage spectroscopy(FISPS) demonstrated that the bound exciton which showed sub-band gap transition characteristics with the asymmetric changes of photoelectric property corresponding to changes in polarity and strength of the external electric field. Compared with TiO2, BET of Pt-TNT increased more than 3.55 times and was 41 m2/g by nitrogen adsorption.

Key words: Pt-modified, TiO2 nanotubes, Photoelectric property, Contact potential barrier

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