Design of gold nanoparticles-decorated SiO2@TiO2 core/shell nanostructures for visible light-activated photocatalysis. Issue 13 (23rd January 2017)

• Record Type: Journal Article
• Authors: Lee, Ryeri; Kumaresan, Yogeenth; Yoon, Sei Young; Um, Soong Ho; Kwon, Il Keun; Jung, Gun Young
• Is Part Of: RSC advances. Volume 7:Issue 13(2017)
• Page Start: 7469
• Page End: 7475
• Publication Date: 2017-01-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra27591e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this study, we designed core/shell nanostructures (CSNs) of silicon dioxide (SiO2 )/titanium dioxide (TiO2 ), which were decorated with gold (Au) nanoparticles (NPs), to activate the visible light-driven photocatalytic reaction. Abstract : In this study, we designed core/shell nanostructures (CSNs) of silicon dioxide (SiO2 )/titanium dioxide (TiO2 ), which were decorated with gold (Au) nanoparticles (NPs), to activate the visible light-driven photocatalytic reaction that is not feasible with only the SiO2 @TiO2 CSN because there is no absorption in the visible wavelengths. The CSNs were simply synthesized by hydrothermal method. In the core/shell structure, TiO2 covered the SiO2 core surface, which acts as a template. The attachment of additional Au NPs inside or outside the core/shell led to absorbance in visible wavelengths of light from the Sun, from which most radiation comes with a spectrum peak at yellow wavelength, owing to the localized surface plasmon resonance (LSPR) peak at approximately 550 nm. The SiO2 @Au@TiO2 @Au CSN (0.01 g) decomposed 1% of methyl orange (MO) solution in 15 mL deionized water in 1 h under the visible light. The visible light-driven photocatalytic reaction was ascribed to the LSPR around the Au NPs that were deposited inner or outer the mesoporous TiO2 shell.