Affiliation:
1. Stake Key Laboratory of Supramolecular Structure and Materials Jilin University Changchun 130012 China
2. Department of Chemistry and Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Chemistry for Energy Materials (2011‐iChEM) College of Chemistry and Materials Fudan University Shanghai 200433 China
3. Femtosecond Laser Laboratory Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics Jilin University Changchun 130012 China
Abstract
AbstractWhile the Lithium ion modification strategy is widely adopted in tuning the bandgap of semiconductors in dye‐sensitized solar cells (DSSCs), such strategy is yet to be applied to semiconductor‐based surface enhanced Raman scattering (SERS), which is also a photo‐induced charge‐transfer (CT) process. Here, a new DSSCs‐inspired modification method is proposed for TiO2 nanoparticles (NPs): through the adsorption of Li+, the surface states of TiO2 NPs are more abundant, so that the SERS intensity and charge transfer of the adsorbed molecule are significantly enhanced. Similar to DSSCs systems, it is found that the conduction band edge and surface state energy level of TiO2 NPs shift downward with increasing Li+ concentration, which facilitates the CT interaction between the molecules and the SERS substrates. The EF can reach to 104, 1–2 degrees higher than previously reported pure semiconductors. This is the first time to use the DSSCs‐inspired Li+ adsorption strategy on TiO2 NPs as SERS substrate to investigate its SERS enhancement effect, which may provide new ideas for the development of semiconductor nanomaterials in the research of SERS substrates.
Funder
National Key Research and Development Program of China
Shanghai Rising-Star Program
Jilin Provincial Scientific and Technological Development Program
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials