Epitaxial TiO 2/SnO 2 core-shell heterostructure by atomic layer deposition

Handle URI:
http://hdl.handle.net/10754/561992
Title:
Epitaxial TiO 2/SnO 2 core-shell heterostructure by atomic layer deposition
Authors:
Nie, Anmin; Liu, Jiabin; Li, Qianqian; Cheng, Yingchun; Dong, Cezhou; Zhou, Wu; Wang, Pengfei; Wang, Qingxiao; Yang, Yang; Zhu, Yihan; Zeng, Yuewu; Wang, Hongtao
Abstract:
Taking 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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Advanced Nanofabrication, Imaging and Characterization Core Lab; Advanced Membranes and Porous Materials Research Center; Core Labs
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Journal of Materials Chemistry
Issue Date:
2012
DOI:
10.1039/c2jm30690e
Type:
Article
ISSN:
09599428
Sponsors:
This 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).
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorNie, Anminen
dc.contributor.authorLiu, Jiabinen
dc.contributor.authorLi, Qianqianen
dc.contributor.authorCheng, Yingchunen
dc.contributor.authorDong, Cezhouen
dc.contributor.authorZhou, Wuen
dc.contributor.authorWang, Pengfeien
dc.contributor.authorWang, Qingxiaoen
dc.contributor.authorYang, Yangen
dc.contributor.authorZhu, Yihanen
dc.contributor.authorZeng, Yuewuen
dc.contributor.authorWang, Hongtaoen
dc.date.accessioned2015-08-03T09:35:47Zen
dc.date.available2015-08-03T09:35:47Zen
dc.date.issued2012en
dc.identifier.issn09599428en
dc.identifier.doi10.1039/c2jm30690een
dc.identifier.urihttp://hdl.handle.net/10754/561992en
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.en
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).en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleEpitaxial TiO 2/SnO 2 core-shell heterostructure by atomic layer depositionen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentCore Labsen
dc.identifier.journalJournal of Materials Chemistryen
dc.contributor.institutionInstitute of Applied Mechanics, Zhejiang University, Hangzhou 310027, Chinaen
kaust.authorCheng, Yingchunen
kaust.authorWang, Qingxiaoen
kaust.authorYang, Yangen
kaust.authorZhu, Yihanen
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