Issue 98, 2015

Anatase TiO2 nanoparticles with controllable crystallinity as a substrate for SERS: improved charge-transfer contribution

Abstract

In this paper, TiO2 nanoparticles (NPs) in the anatase phase were synthesized by a very simple sol-hydrothermal method with the assistance of H2SO4. And importantly, the crystallinity and the surface defects (surface state) of anatase TiO2 NPs can be regulated and controlled by this means for improving their SERS performances. The 4-MBA molecule adsorbed on 0.14 mL-H2SO4–TiO2 NPs exhibits the highest SERS enhancement, as compared with the native enhancement on unmodified TiO2 NPs. The introduction of H2SO4 not only enriches the surface defects of anatase TiO2 and the adsorption site, but also improves the separation efficiency of photo-generated carriers, which all can promote the TiO2-to-molecule charge transfer and are mainly responsible for the improved SERS performances.

Graphical abstract: Anatase TiO2 nanoparticles with controllable crystallinity as a substrate for SERS: improved charge-transfer contribution

Article information

Article type
Paper
Submitted
25 aug 2015
Accepted
17 sep 2015
First published
17 sep 2015

RSC Adv., 2015,5, 80269-80275

Anatase TiO2 nanoparticles with controllable crystallinity as a substrate for SERS: improved charge-transfer contribution

M. Gong, X. Jiang, J. Du, X. Li, X. Han, L. Yang and B. Zhao, RSC Adv., 2015, 5, 80269 DOI: 10.1039/C5RA17176H

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