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Title: Microfluidic reactors for plasmonic photocatalysis using gold nanoparticles
Authors: Jia, HP 
Wong, YL 
Jian, AQ
Tsoi, CC 
Wang, ML
Li, WH
Zhang, WD
Sang, SB
Zhang, XM 
Issue Date: 2019
Source: Micromachines, 11 Dec. 2019, v. 10, no. 12, 869, p. 1-11
Abstract: This work reports a microfluidic reactor that utilizes gold nanoparticles (AuNPs) for the highly efficient photocatalytic degradation of organic pollutants under visible light. The bottom of microchamber has a TiO2 film covering a layer of AuNPs (namely, TiO2/AuNP film) deposited on the F-doped SnO2 (FTO) substrate. The rough surface of FTO helps to increase the surface area and the AuNPs enables the strong absorption of visible light to excite electron/hole pairs, which are then transferred to the TiO2 film for photodegradation. The TiO2 film also isolates the AuNPs from the solution to avoid detachment and photocorrosion. Experiments show that the TiO2/AuNP film has a strong absorption over 400-800 nm and enhances the reaction rate constant by 13 times with respect to the bare TiO2 film for the photodegradation of methylene blue. In addition, the TiO2/AuNP microreactor exhibits a negligible reduction of photoactivity after five cycles of repeated tests, which verifies the protective function of the TiO2 layer. This plasmonic photocatalytic microreactor draws the strengths of microfluidics and plasmonics, and may find potential applications in continuous photocatalytic water treatment and photosynthesis. The fabrication of the microreactor uses manual operation and requires no photolithography, making it simple, easy, and of low cost for real laboratory and field tests.
Keywords: Microfluidics
Gold nanoparticles
Localized surface plasmon resonance
Visible light photocatalysis
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Micromachines 
ISSN: 2072-666X
EISSN: 2072-666X
DOI: 10.3390/mi10120869
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
The following publication Jia, H.; Wong, Y.L.; Jian, A.; Tsoi, C.C.; Wang, M.; Li, W.; Zhang, W.; Sang, S.; Zhang, X. Microfluidic Reactors for Plasmonic Photocatalysis Using Gold Nanoparticles. Micromachines 2019, 10, 869, 1-11 is available at
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