Controllable Fabrication and Photocatalytic Activity of ZnO Nanobelt Arrays

详细信息    查看全文

• 作者：Tianjun Sun ; Jieshan Qiu ; Changhai Liang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：January 24, 2008
• 年：2008
• 卷：112
• 期：3
• 页码：715 - 721
• 全文大小：966K
• 年卷期：v.112,no.3(January 24, 2008)
• ISSN：1932-7455

文摘

Well-aligned single-crystalline ZnO nanobelt arrays were fabricated on a Si wafer by a carbothermal reductionroute with the assistance of a SnO₂/Sn species. The as-prepared ZnO nanobelt arrays were characterized byX-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electronmicroscopy, UV-vis spectroscopy, and photoluminescence spectroscopy. The photocatalytic activity for methylorange on the ZnO nanobelt arrays was also investigated under UV irradiation. The ZnO nanobelts are severaltens of nanometers in thickness, 100-500 nm in width, and have a length of up to several micrometers. Ithas been found that the ZnO nanobelt arrays form on a substrate only when the thickness of the SnO₂ coatingis less than 100 nm. The rod-/comb-like ZnO nanostructures and the ZnO film can be obtained by increasingthe SnO₂ loading or the temperature, respectively. The ZnO nanobelts grow from the active surface at thenanobelt root via a vapor-liquid-solid mechanism. The ZnO nanobelt arrays show strong emission both inthe UV and in the green region. The as-prepared ZnO nanobelt arrays have a good photocatalytic property,as evidenced by the result that over 94% of the methyl orange decomposed over the ZnO nanobelt arrays,which is better than the as-prepared ZnO film and the rod-/comb-like ZnO nanostructures under identicalconditions.