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	Tunable photocurrent spectrum in well-oriented zinc oxide nanorod arrays with enhanced photocatalytic activity
	Geng Wang ; Da Chen ; Hao Zhang ; Zhang, J.Z. ; Jinghong Li
	2010-10-12 ; 2010-10-12
关键词	Experimental/ catalysts charge exchange conduction bands crystal growth from solution electrochemical electrodes field emission electron microscopy II-VI semiconductors impurity states nanoparticles nanotechnology photoconductivity photoelectrochemistry photoelectron spectra scanning electron microscopy semiconductor growth surface states wide band gap semiconductors X-ray diffraction zinc compounds/ tunable photocurrent spectrum zinc oxide nanorod arrays enhanced photocatalytic activity seed growth method catalyst-free hydrothermal synthesis field emission scanning electron microscopy optical spectroscopy photoelectrochemistry X-ray diffraction techniques electrode photodegradation rhodamine B nanoparticles electron-hole pairs electron transfer surface states electron donor states negative shift conduction band electronic properties wavelength 345 nm to 385 nm ZnO/ A8116 Methods of nanofabrication and processing A8250 Photochemistry and radiation chemistry A8265J Heterogeneous catalysis at surfaces and other surface reactions A8110D Crystal growth from solution A6146 Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials A8245 Electrochemistry and electrophoresis A8160C Surface treatment and degradation in semiconductor technology A8230F Ion-molecule, ion-ion, and charge-transfer reactions A7155G Impurity and defect levels in II-VI and III-V semiconductors A7125T Electronic structure of crystalline semiconductor compounds and insulators A7865K Optical properties of II-VI and III-V semiconductors (thin films/low-dimensional structures) A7320A Surface states, band structure, electron density of states A7240 Photoconduction and photovoltaic effects photodielectric effects A7960E Photoelectron spectra of semiconductors and insulators B0510 Crystal growth B2520D II-VI and III-V semiconductors/ wavelength 3.45E-07 to 3.85E-07 m/ ZnO/bin Zn/bin O/bin
中文摘要	Well-oriented ZnO nanorod arrays were successfully prepared using a seed growth method based on catalyst- free hydrothermal synthesis and characterized by field emission scanning electron microscopy, optical spectroscopy, photoelectrochemistry, and X-ray diffraction techniques. Compared to ZnO nanoparticles or randomly distributed ZnO nanorods, the well-oriented ZnO nanorod arrays exhibited significantly different electronic and photoelectrochemical properties. The generated photocurrent of the well-oriented ZnO nanorod array electrode was enhanced with several orders of magnitude higher intensities than that of the ZnO nanoparticle or the randomly distributed ZnO nanorod electrodes with the maximum wavelength of the photocurrent spectrum tunable from 345 to 385 nm. The photocatalytic activity of the well-oriented ZnO nanorod arrays, evaluated using the photodegradation of Rhodamine B as a probe reaction, was also significantly enhanced in comparison to that of ZnO nanoparticles or TiO/sub 2/ P25 nanoparticles. The enhancement of the photocurrent and photocatalytic activity is suggested to arise from the tunable photoresponse that enhances the light harvesting and thereby generation of a larger number of photoinduced electron-hole pairs at active sites. Other possible causes include favorable electron transfer and electronic properties of the well-oriented ZnO nanorod arrays, for example, high densities of surface states and electron donor states as well as negative shift of the conduction band. The results are important for understanding the unique electronic and photoelectrochemical properties of well-oriented arrayed nanostructures and for designing novel arrayed nanostructures with advanced functionalities for photocatalytic and photoelectrochemical applications.
语种	英语
出版者	American Chemical Society ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80853]
专题	清华大学
推荐引用方式 GB/T 7714	Geng Wang,Da Chen,Hao Zhang,et al. Tunable photocurrent spectrum in well-oriented zinc oxide nanorod arrays with enhanced photocatalytic activity[J],2010, 2010.
APA	Geng Wang,Da Chen,Hao Zhang,Zhang, J.Z.,&Jinghong Li.(2010).Tunable photocurrent spectrum in well-oriented zinc oxide nanorod arrays with enhanced photocatalytic activity..
MLA	Geng Wang,et al."Tunable photocurrent spectrum in well-oriented zinc oxide nanorod arrays with enhanced photocatalytic activity".(2010).

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