期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 281, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2022.121643
关键词
Multiple energy levels; Ce-doped; Semiconductor; SERS
类别
资金
- National Natural Science Foundation of China [21804054, 21773080]
- Natural Science Foundation of Hei- longjiang Province of China for Distinguished Young Scholars [JQ2019B002]
- Excellent Discipline Team Project of Jiamusi University [JDXKTD-2019007]
- Open Project of State Key Laboratory of Su- pramolecular Structure and Materials [sklssm2021026]
Doping rare earth element Ce into TiO2 generates multiple energy levels, which enhances the SERS performance of TiO2 semiconductor substrate by improving the separation of photogenerated carriers and charge transfer efficiency.
Considering the variable valence characteristics of rare earth elements, they can be in a variety of valence forms coexistence. Doping of rare earth element with different valence states may produce different energy levels to tune the semiconductor energy band structure. We utilize rare earth element Ce doping TiO2 for the development of high-performance semiconductor surface-enhanced Raman scattering (SERS) substrates based on an energylevel tuning strategy. Ce doping not only forms multiple energy levels including Ce3+ and Ce4+ metal doping energy levels in the bandgap of TiO2, but also enriches the surface state level of TiO2 itself, which together promote the separation of photogenerated carriers and improve charge transfer efficiency between substrates and absorbed molecules. This endows TiO2 semiconductor substrate with a higher SERS enhancement factor, which can reach 2.2 x 106. The detectable concentration of methylene blue can be as low as 10-10 mol/L. Moreover, the semiconductor substrate exhibits excellent uniformity and stability. This study not only provides a new strategy to develop excellent semiconductor SERS substrate with multiple energy levels, but also lays the foundation for promising practical application of semiconductor substrate.
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