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Author Karbalaei Akbari, Mohammad ♦ Hai, Zhenyin ♦ Wei, Zihan ♦ Hu, Jie ♦ Zhuiykov, Serge
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ABSORPTION SPECTROSCOPY ♦ CATALYSTS ♦ CURRENT DENSITY ♦ DEPOSITION ♦ ELECTRON BEAM INJECTION ♦ FILMS ♦ HEXADECANOIC ACID ♦ ILLUMINANCE ♦ INFRARED SPECTRA ♦ OXIDATION ♦ PALLADIUM ♦ PHOTOCATALYSIS ♦ PHOTOVOLTAIC EFFECT ♦ SILICA ♦ TITANIUM OXIDES ♦ TWO-DIMENSIONAL CALCULATIONS ♦ ULTRAVIOLET RADIATION ♦ VISIBLE RADIATION
Abstract Highlights: • Successful wafer-scale atomic layer deposition of 2D Au-TiO{sub 2} bilayer photocatalyst films. • The efficient degradation of fatty acid by tailoring 2D TiO{sub 2} films under UV and visible light illumination. • Improved visible light photocatalytic activity and photocurrent density of 2D Au-TiO{sub 2} bilayer films. • Comparable photocatalytic performance of ultra-thin 2D TiO{sub 2} and thick TiO{sub 2} films under UV light illumination. - Abstract: Bilayer Au-TiO{sub 2} configuration with two-dimensional (2D) TiO{sub 2} films enabled sensible improvement in photocatalytic degradation of Palmitic Acid (PA) and also the enhancement of current density under visible light illumination. The improved visible light photocatalytic and photocurrent properties were attained when 35 nm thick 2D TiO{sub 2} film was developed by atomic layer deposition (ALD) on Si/SiO{sub 2}-Au substrate. The Au-TiO{sub 2} bilayer demonstrated the improved photocatalytic and photovoltaic performances compared with those TiO{sub 2} films developed on Si/SiO{sub 2} bare substrate. These improvements can be attributed to the plasmonic effects of Au film acting as antenna for visible light and also serving as hole acceptor during photocatalysis process. The proposed mechanisms for enhanced visible light performance of bilayer films are hot electron injection and the formation of hot spots at Au-TiO{sub 2} interface which contributed to the electron injection to conduction band of TiO{sub 2} or facilitated the separation of generated electron-hole pairs at Au-TiO{sub 2} Schottky junction.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-11-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 95


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