拉曼散射
离子
稀土
物理
散射
原子物理学
拉曼光谱
材料科学
化学
矿物学
光学
量子力学
作者
Hao Jin,Tamitake Itoh,Yuko S. Yamamoto
标识
DOI:10.1021/acs.jpcc.3c05225
摘要
In this study, surface-enhanced Raman scattering (SERS) spectra of different rare earth (RE) ion-citrate complexes were investigated for the first time for the qualitative classification of RE3+ ions. With the addition of RE3+ ions to citrate-capped silver nanoparticles in aqueous solutions, the Raman signals of RE-citrate complexes were enhanced, and characteristic peaks appeared near 1065 and 1315 cm–1. The I1065/I1315 ratios of La-citrate and Gd-citrate were approximately 1 and 0.55, respectively. Thus, different RE3+ ions were classified based on the ratio of characteristic SERS peaks near 1065 and 1315 cm–1. In addition, the effects of RE3+ ions in the RE-citrate complexes were analyzed based on density functional theory (DFT) calculations. Calculation results show that these characteristic peaks are attributed to the coordination of the C–O bond and COO– groups of citrates with the RE3+ ions, suggesting that these are spin-related bands of the RE-citrate complexes.
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