| Hierarchical assembly of ultrathin hexagonal SnS(2) nanosheets onto electrospun TiO(2) nanofibers: enhanced photocatalytic activity based on photoinduced interfacial charge transfer. | |
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MedLine Citation:
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PMID: 23202888 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Well-designed hierarchical nanostructures with one dimensional (1D) TiO(2) nanofibers (120-350 nm in diameter and several micrometers in length) and ultrathin hexagonal SnS(2) nanosheets (40-70 nm in lateral size and 4-8 nm in thickness) were successfully synthesized by combining the electrospinning technique (for TiO(2) nanofibers) and a hydrothermal growth method (for SnS(2) nanosheets). The single-crystalline SnS(2) nanosheets with a 2D layered structure were uniformly grown onto the electrospun TiO(2) nanofibers consisted of either anatase (A) phase or anatase-rutile (AR) mixed phase TiO(2) nanoparticles. The definite heterojunction interface between SnS(2) nanosheets and TiO(2) (A or R) nanoparticles were investigated by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Moreover, the as-prepared SnS(2)/TiO(2) hierarchical nanostructures as nanoheterojunction photocatalysts exhibited excellent UV and visible light photocatalytic activities for the degradation of organic dyes (rhodamine B and methyl orange) and phenols (4-nitrophenol), remarkably superior to the TiO(2) nanofibers and the SnS(2) nanosheets, mainly owing to the photoinduced interfacial charge transfer based on the photosynergistic effect of the SnS(2)/TiO(2) heterojunction. Significantly, the SnS(2)/TiO(2) (AR) hierarchical nanostructures as the tricomponent heterojunction system possessed stronger photocatalytic activity than the bicomponent heterojunction system of SnS(2)/TiO(2) (A) hierarchical nanostructures or TiO(2) (AR) nanofibers, which was discussed in terms of the three-way photosynergistic effect between SnS(2), TiO(2) (A) and TiO(2) (R) component in the SnS(2)/TiO(2) (AR) heterojunction resulting in the high separation efficiency of photoinduced electron-hole pairs, as evidenced by photoluminescence (PL) and surface photovoltage spectra (SPS). |
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Authors:
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Zhenyi Zhang; Changlu Shao; Xinghua Li; Yangyang Sun; Mingyi Zhang; Jingbo Mu; Peng Zhang; Zengcai Guo; Yichun Liu |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-12-3 |
Journal Detail:
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Title: Nanoscale Volume: - ISSN: 2040-3372 ISO Abbreviation: Nanoscale Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-12-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101525249 Medline TA: Nanoscale Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, People's Republic of China. clshao@nenu.edu.cn. |
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