High spin Fe³⁺-related bonding strength and electron transfer for sensitive and stable SERS detection.

ABSTRACT: The intrinsic electronic states of transition metal-containing SERS substrates, especially the effect of spin state on the detection sensitivity, still remain unknown. Herein, we propose a simple co-precipitation approach to form trimetallic MIL-101(FeNiTi) with high-spin (HS) Fe³⁺ as a result of geometric distortion of the octahedral symmetry. Using methylene blue as a demonstration, the trimetallic MIL-101(FeNiTi) shows a high enhancement factor (EF) of 6.1 × 10⁶, a low detection limit of 10^-9 M and excellent detection stability after long-term preservation. X-ray absorption fine structure and photoelectron spectra demonstrate that coupling between high-spin Fe³⁺ and aliovalent transition metals Ni²⁺ and Ti⁴⁺ with differen

SUBMITTER: Zheng X 

PROVIDER: S-EPMC9629176 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature