Rutile TiO2 nanowires on anatase TiO2 nanofibers: A branched heterostructured photocatalysts via interface-assisted fabrication approach

被引:53
作者
Wang, Changhua [1 ,2 ]
Zhang, Xintong [1 ]
Shao, Changlu [1 ]
Zhang, Yanli [1 ]
Yang, Jikai [1 ]
Sun, Panpan [1 ]
Liu, Xueping [1 ]
Liu, Hong [1 ]
Liu, Yichun [1 ]
Xie, Tengfeng [3 ]
Wang, Dejun [3 ]
机构
[1] NE Normal Univ, Minist Educ, Key Lab UV Emitting Mat & Technol, Ctr Adv Optoelect Funct Mat Res, Changchun 130024, Peoples R China
[2] Beihua Univ, Coll Chem & Biol, Beijing 132013, Jilin, Peoples R China
[3] Jinlin Univ, Coll Chem, Changchun 130012, Peoples R China
基金
中国国家自然科学基金;
关键词
Branched heterostructures; Interface-assisted preparation; Titanium dioxide; Photocatalysis; Synergistic effect; NANOPARTICLES; NANOSTRUCTURES; TRANSPORT; NANORODS;
D O I
10.1016/j.jcis.2011.07.035
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A water-dichloromethane interface-assisted hydrothermal method was employed to grow rutile TiO2 nanowires (NWs) on electrospun anatase TiO2 nanofibers (NFs), using highly reactive TiCl4 as precursor. The water-dichloromethane interface inhibited the formation of rutile NWs in water phase, but promoted the selective radial growth of densely packed rutile NWs on anatase NFs to form a branched heterojunction. The density and length of rutile NWs could be readily controlled by varying reaction parameters. A formation mechanism for the branched heterojunction was proposed which involved (1) the entrapment of rutile precursor nanoparticles at water-dichloromethane interface, (2) the growth of rutile NWs on anatase NFs via Ostwald ripening through the scavengering of interface-entrapped rutile nanoparticles. The heterojunction formed at anatase NF and rutile NW enhanced the charge separation of both under ultraviolet excitation, as evidenced by photoluminescence and surface photovoltage spectra. The branched TiO2 heterostructures showed higher photocatalytic activity in degradation of rodamine B dye solution than anatase NFs, and the mixture of anatase NFs, and P25 powders, which was discussed in terms of the synergistic effect of enhanced charge separation by anatase-rutile heterojunction, high activity of rutile NWs, and increased specific area of branched heterostructures. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:157 / 164
页数:8
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