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Indium-doped ZnO nanowires with infrequent growth orientation, rough surfaces and low-density surface traps.

Duan H, He H, Sun L, Song S, Ye Z - Nanoscale Res Lett (2013)

Bottom Line: With increasing In content, the growth orientation of the nanowires switches from [101_0] to infrequent [022_3] and the surface becomes rough.No surface-related exciton emission is observed in these nanowires.These unique properties make In-doped ZnO nanowire a potential material for photocatalysis application, which is demonstrated by the enhanced photocatalytic degradation of Rhodamine B.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, People's Republic of China. hphe@zju.edu.cn.

ABSTRACT
Indium-doped ZnO nanowires have been prepared by vapor transport deposition. With increasing In content, the growth orientation of the nanowires switches from [101_0] to infrequent [022_3] and the surface becomes rough. No surface-related exciton emission is observed in these nanowires. The results indicate that large surface-to-volume ratio, high free electron concentration, and low density of surface traps can be achieved simultaneously in ZnO nanowires via In doping. These unique properties make In-doped ZnO nanowire a potential material for photocatalysis application, which is demonstrated by the enhanced photocatalytic degradation of Rhodamine B.

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UV–vis absorption spectra of ZnO NWs. UV–vis absorption spectral variations of RhB solution over (a) undoped and (b) In-doped ZnO NWs. (c) Degradation rate of RhB solutions over undoped and In-doped ZnO NWs under irradiation.
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Figure 5: UV–vis absorption spectra of ZnO NWs. UV–vis absorption spectral variations of RhB solution over (a) undoped and (b) In-doped ZnO NWs. (c) Degradation rate of RhB solutions over undoped and In-doped ZnO NWs under irradiation.

Mentions: The realization of ZnO nanostructures with large surface-to-volume ratio and low density of surface traps may enhance the photocatalytic performance. To evaluate the photocatalytic activities of In-doped ZnO NWs, degradation of RhB in aqueous solution was investigated. Figure 5 shows the results of RhB photo-degradation over undoped and In-doped ZnO NWs. It was evident that the ZnO NWs with high In doping content (#3) exhibited much better photocatalytic performance than the undoped one. After illuminating for 100 min, sample #3 was found to degrade nearly 73% of the initial RhB dye, while the degradation over undoped ZnO NWs was less effective, only 20% within the same irradiation time. It is well known that the photocatalytic activities of semiconductor materials are closely related to their morphology, structure and surface properties [25]. Therefore, the much improved photocatalytic performance of In-doped ZnO NWs is probably associated with their large surface-to-volume ratio and low density of surface traps.


Indium-doped ZnO nanowires with infrequent growth orientation, rough surfaces and low-density surface traps.

Duan H, He H, Sun L, Song S, Ye Z - Nanoscale Res Lett (2013)

UV–vis absorption spectra of ZnO NWs. UV–vis absorption spectral variations of RhB solution over (a) undoped and (b) In-doped ZnO NWs. (c) Degradation rate of RhB solutions over undoped and In-doped ZnO NWs under irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3842743&req=5

Figure 5: UV–vis absorption spectra of ZnO NWs. UV–vis absorption spectral variations of RhB solution over (a) undoped and (b) In-doped ZnO NWs. (c) Degradation rate of RhB solutions over undoped and In-doped ZnO NWs under irradiation.
Mentions: The realization of ZnO nanostructures with large surface-to-volume ratio and low density of surface traps may enhance the photocatalytic performance. To evaluate the photocatalytic activities of In-doped ZnO NWs, degradation of RhB in aqueous solution was investigated. Figure 5 shows the results of RhB photo-degradation over undoped and In-doped ZnO NWs. It was evident that the ZnO NWs with high In doping content (#3) exhibited much better photocatalytic performance than the undoped one. After illuminating for 100 min, sample #3 was found to degrade nearly 73% of the initial RhB dye, while the degradation over undoped ZnO NWs was less effective, only 20% within the same irradiation time. It is well known that the photocatalytic activities of semiconductor materials are closely related to their morphology, structure and surface properties [25]. Therefore, the much improved photocatalytic performance of In-doped ZnO NWs is probably associated with their large surface-to-volume ratio and low density of surface traps.

Bottom Line: With increasing In content, the growth orientation of the nanowires switches from [101_0] to infrequent [022_3] and the surface becomes rough.No surface-related exciton emission is observed in these nanowires.These unique properties make In-doped ZnO nanowire a potential material for photocatalysis application, which is demonstrated by the enhanced photocatalytic degradation of Rhodamine B.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, People's Republic of China. hphe@zju.edu.cn.

ABSTRACT
Indium-doped ZnO nanowires have been prepared by vapor transport deposition. With increasing In content, the growth orientation of the nanowires switches from [101_0] to infrequent [022_3] and the surface becomes rough. No surface-related exciton emission is observed in these nanowires. The results indicate that large surface-to-volume ratio, high free electron concentration, and low density of surface traps can be achieved simultaneously in ZnO nanowires via In doping. These unique properties make In-doped ZnO nanowire a potential material for photocatalysis application, which is demonstrated by the enhanced photocatalytic degradation of Rhodamine B.

No MeSH data available.


Related in: MedlinePlus