title: Recyclable Au-TiO2nanocomposite SERS-active substrates contributed by synergistic charge-transfer effect.
abstract: In this study, Au deposited TiO2(Au-TiO2) nanocomposites were prepared by photocatalytic reduction of Au species (HAuCl4) on TiO2nanoparticles (NPs) and served as efficient SERS-active substrates. The observed considerable SERS enhancement of 4-MBA molecules on Au-TiO2NPs compared with that on pure TiO2NPs can be attributed to the synergistic contribution of semiconductors and metals by the charge-transfer mechanism from the substrate to the molecule. In the preparation of Au-TiO2nanocomposites, the photo-reduction time and concentration of HAuCl4have an important influence on the SERS enhancement effect of the composite substrate. Moreover, for the recycle of substrates, the photocatalytic experiment of Au-TiO2nanocomposites was carried out. The results show that these nanocomposite substrates are characterized by a self-cleaning property and can be repeatedly used in SERS experiments without losing their activity and with high stability.
authors.affiliation: College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China. ylb76@163.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Sun
authors.forename: Di
authors.initials: D
authors.lastname: Yin
authors.forename: Xiuling
authors.initials: X
authors.lastname: Li
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Han
authors.forename: Libin
authors.initials: L
authors.lastname: Yang
authors.forename: Bing
authors.initials: B
authors.lastname: Zhao