| Band gap narrowing of titanium oxide semiconductors by noncompensated anion-cation codoping for enhanced visible-light photoactivity. | |
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MedLine Citation:
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PMID: 20366114 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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"Noncompensated n-p codoping" is established as an enabling concept for enhancing the visible-light photoactivity of TiO2 by narrowing its band gap. The concept embodies two crucial ingredients: the electrostatic attraction within the n-p dopant pair enhances both the thermodynamic and kinetic solubilities, and the noncompensated nature ensures the creation of tunable intermediate bands that effectively narrow the band gap. The concept is demonstrated using first-principles calculations, and is validated by direct measurements of band gap narrowing using scanning tunneling spectroscopy, dramatically redshifted optical absorbance, and enhanced photoactivity manifested by efficient electron-hole separation in the visible-light region. This concept is broadly applicable to the synthesis of other advanced functional materials that demand optimal dopant control. |
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Authors:
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Wenguang Zhu; Xiaofeng Qiu; Violeta Iancu; Xing-Qiu Chen; Hui Pan; Wei Wang; Nada M Dimitrijevic; Tijana Rajh; Harry M Meyer; M Parans Paranthaman; G M Stocks; Hanno H Weitering; Baohua Gu; Gyula Eres; Zhenyu Zhang |
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Publication Detail:
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Type: Journal Article Date: 2009-11-23 |
Journal Detail:
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Title: Physical review letters Volume: 103 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2009 Nov |
Date Detail:
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Created Date: 2010-04-06 Completed Date: 2010-06-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 226401 Citation Subset: - |
Affiliation:
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Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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