TiO2 coated CuO nanowire array: Ultrathin p-n heterojunction to modulate cationic/anionic dye photo-degradation in water

被引：38

作者：

Scuderi, Viviana ^{[1
]}

Amiard, Guillaume ^{[2
]}

Sanz, Ruy ^{[1
]}

Boninelli, Simona ^{[1
]}

Impellizzeri, Giuliana ^{[1
]}

Privitera, Vittorio ^{[1
]}

机构：

[1] CNR IMM, Via S Sofia 64, I-195123 Catania, Italy

[2] Univ Poitiers, Inst Pprime, UPR 3346, CNRS,ISAE ENSMA, Blvd Marie & Pierre Curie, F-86962 Futuroscope, France

来源：

APPLIED SURFACE SCIENCE | 2017年 / 416卷

关键词：

TiO2; CuO; Photocatalysis; Nanostructures; Heterojunction; PHOTOCATALYTIC ACTIVITY; EFFICIENT; FILMS;

D O I：

10.1016/j.apsusc.2017.04.229

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：

We report the photocatalytic efficiency of CuO nanowires covered with a thin TiO2 film, studied by dyes degradation in water. The CuO nanowires were synthesized on Cu foils by thermal oxidation. A subsequent TiO2 deposition (7, 15, 30, 50 nm thick) was performed by atomic layer deposition, developing an ultrathin p-n heterojunction. A structural characterization was obtained by X-ray diffraction analysis, scanning and transmission electron microscopies equipped with energy dispersive x-ray analysis. The photocatalytic activity of the investigated materials was tested by the degradation of a cationic (methylene blue) or anionic (methyl orange). The relevance of the reported results was discussed in relation with the effects of the ultrathin p-n TiO2/CuO heterojunction. The two semiconductors are in intimate connection increasing the exposed surface and only TiO2 is directly in contact with water. This allowed to study systematically the effect of the electric filed generated by the p-n junction on the interface TiO2/liquid and therefore to modulate cationic/anionic dyes photo-degradation in water. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：885 / 890

页数：6

共 34 条

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