ZnO Nanotubes Grown at Low Temperature Using Ga as Catalysts and Their Enhanced Photocatalytic Activities
ZnO Nanotubes Grown at Low Temperature Using Ga as Catalysts and Their Enhanced Photocatalytic Activities
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DOI：
10.1021/jp901011u
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发表时间：
2009-06-18
影响因子：
3.7
通讯作者：
Wang, Zhong Lin
中科院分区：
文献类型：
--
作者：
Bae, Joonho;Bin Han, Jing;Wang, Zhong Lin
本文报道了低温气相输运法合成氧化锌纳米管及其光催化活性。Ga的低熔点（29℃）导致ZnO纳米管在80℃的低温下生长，使我们能够使用Kapton薄膜或ITO玻璃作为衬底。结构分析表明，该纳米管为单晶，具有中空结构，壁厚约为2 nm，长几十微米，直径为60-300 nm。通过测定光诱导降解罗丹明B （RB）和含偶氮苯的聚合物聚{1-4[4-（3-羧基-4-羟基苯基-偶氮）苯磺胺]- 1,2-乙二基钠盐}（PAZO）溶液来测定ZnO纳米管的光催化活性。测定结果表明，RB和PAZO的光分解反应符合一阶速率规律，速率常数分别为0.018和0.004 s（-1）。与ZnO薄膜和ZnO纳米线相比，ZnO纳米管的光催化活性大大增强。因此，本工作展示了一种在柔性衬底上合成ZnO纳米管的新颖而简单的方法，它可以作为降解水中有机污染物的优良光催化剂。
We report the synthesis of ZnO nanotubes grown via the Ga-catalyzed vapor transport method at low temperature and their photocatalytic activity. The low melting point of Ga (29 degrees C) resulted in the growth of ZnO nanotubes at a low temperature of 80 degrees C, enabling us to use Kapton film or ITO glass as substrates. Structure analysis shows that the nanotube is single crystal and has a hollow structure with a wall thickness of similar to 2 nm, is several tens of micrometers long, and has a diameter of 60-300 nm. Photocatalytic activity of ZnO nanotubes was determined by measuring the photoinduced degradation of rhodamine B (RB) and an azobenzene-containing polymer poly{1-4[4-(3-carboxy-4-hydroxyphenyl-azo)benzenesulfonamido]- 1,2-ethanediyl sodium salt} (PAZO) solution, respectively. The measurement reveals that the photodecomposition reactions of both RB and PAZO follow the first-order rate law with the rate constant of 0.018 and 0.004 s(-1), respectively. The photocatalytic activity of ZnO nanotubes was shown to be much enhanced compared with ZnO thin films and ZnO nanowires. Therefore, this work demonstrates a novel and simple way to synthesize ZnO nanotubes on flexible substrates, which can potentially serve as excellent photocatalysts for the degradation of organic pollutants in water.