Wafer-scale two-dimensional Au-TiO{sub 2} bilayer films for photocatalytic degradation of Palmitic acid under UV and visible light illumination

Journal Article · Wed Nov 15 00:00:00 EST 2017 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.08.001· OSTI ID:22730461

Hai, Zhenyin; Wei, Zihan ^[1]; Hu, Jie ^[2]; Zhuiykov, Serge ^[1]

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1. Ghent University Global Campus, Department of Applied Analytical & Physical Chemistry, Faculty of Bioscience Engineering, 119 Songdomunhwa-ro, Yeonsu-gu, Incheon (Korea, Republic of)
2. Micro and Nano System Research Center, Taiyuan University of Technology, Taiyuan 030024, Shanxi (China)

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.

• OSTI ID: 22730461
• Journal Information: Materials Research Bulletin, Vol. 95; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 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