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Author Lin, Der-Hwa ♦ Chang, Kao-Shuo
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ AMMONIA ♦ AUGER ELECTRON SPECTROSCOPY ♦ ELECTRON DIFFRACTION ♦ ELECTRON PROBES ♦ ELECTRONS ♦ FILMS ♦ IRRADIATION ♦ MORPHOLOGY ♦ PERFORMANCE ♦ PHOTOCATALYSIS ♦ PHOTONS ♦ REACTION KINETICS ♦ SPUTTERING ♦ STOICHIOMETRY ♦ TANTALUM NITRIDES ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ TUNING ♦ X-RAY PHOTOELECTRON SPECTROSCOPY
Abstract This paper presents the photocatalytic and photoelectrochemical (PEC) properties of Ta{sub 3}N{sub 5} microcolumn films. The highlights include (1) overcoming the fundamental barrier of standard reactive sputtering for fabricating microcolumns; (2) preventing unnecessary complexity from complicating facile sputtering; (3) an alternative but effective approach for fabricating Ta{sub 3}N{sub 5} without using caustic NH{sub 3} gases; (4) investigating morphology tuning for favorable photocatalysis and PEC reactions; and (5) elucidating the relationships of the structures, morphologies, and properties of Ta{sub 3}N{sub 5} microcolumns. High-resolution transmission electron microscopy and selective-area electron diffraction verified the polycrystallinity of Ta{sub 3}N{sub 5} microcolumns, of which the elemental compositions and stoichiometry were measured using electron-probe energy dispersive spectroscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy. The corresponding band gap was determined to be approximately 2.1 eV. The sample exhibited a superior photodegradation capability; the photodegradation rate constant k was determined to be approximately 1.4 times higher than that of P25 under UV irradiation. A photocatalytic and PEC cycling test indicated the photodegradation reusability and photostability of the Ta{sub 3}N{sub 5} microcolumns. The incident photon-to-current efficiency performance reached 6%, suggesting that these microcolumns hold potential for application in PEC devices.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-21
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 120
Issue Number 7


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