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dc.contributor.authorNie, Anmin
dc.contributor.authorLiu, Jiabin
dc.contributor.authorLi, Qianqian
dc.contributor.authorCheng, Yingchun
dc.contributor.authorDong, Cezhou
dc.contributor.authorZhou, Wu
dc.contributor.authorWang, Pengfei
dc.contributor.authorWang, Qingxiao
dc.contributor.authorYang, Yang
dc.contributor.authorZhu, Yihan
dc.contributor.authorZeng, Yuewu
dc.contributor.authorWang, Hongtao
dc.date.accessioned2015-08-03T09:35:47Z
dc.date.available2015-08-03T09:35:47Z
dc.date.issued2012
dc.identifier.issn09599428
dc.identifier.doi10.1039/c2jm30690e
dc.identifier.urihttp://hdl.handle.net/10754/561992
dc.description.abstractTaking TiO 2/SnO 2 core-shell nanowires (NWs) as a model system, we systematically investigate the structure and the morphological evolution of this heterostructure synthesized by atomic layer deposition/epitaxy (ALD/ALE). All characterizations, by X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction and Raman spectra, reveal that single crystalline rutile TiO 2 shells can be epitaxially grown on SnO 2 NWs with an atomically sharp interface at low temperature (250 °C). The growth behavior of the TiO 2 shells highly depends on the surface orientations and the geometrical shape of the core SnO 2 NW cross-section. Atomically smooth surfaces are found for growth on the {110} surface. Rough surfaces develop on {100} surfaces due to (100) - (1 × 3) reconstruction, by introducing steps in the [010] direction as a continuation of {110} facets. Lattice mismatch induces superlattice structures in the TiO 2 shell and misfit dislocations along the interface. Conformal epitaxial growth has been observed for SnO 2 NW cores with an octagonal cross-section ({100} and {110} surfaces). However, for a rectangular core ({101} and {010} surfaces), the shell also derives an octagonal shape from the epitaxial growth, which was explained by a proposed model based on ALD kinetics. The surface steps and defects induced by the lattice mismatch likely lead to improved photoluminescence (PL) performance for the yellow emission. Compared to the pure SnO 2 NWs, the PL spectrum of the core-shell nanostructures exhibits a stronger emission peak, which suggests potential applications in optoelectronics. © The Royal Society of Chemistry 2012.
dc.description.sponsorshipThis work has been supported by the National Science Foundation of China (Grant No. 11002124 and No. 11090333) and the Science Foundation of Chinese University (Grant No. 2011QNA4038).
dc.publisherRoyal Society of Chemistry (RSC)
dc.titleEpitaxial TiO 2/SnO 2 core-shell heterostructure by atomic layer deposition
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
dc.contributor.departmentCore Labs
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Materials Chemistry
dc.contributor.institutionInstitute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China
kaust.personCheng, Yingchun
kaust.personWang, Qingxiao
kaust.personYang, Yang
kaust.personZhu, Yihan


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