Surface-Enhanced Raman Spectroscopy on Amorphous Semiconducting Rhodium Sulfide Microbowl Substrates.

ABSTRACT: Exploring highly surface-enhanced Raman scattering (SERS)-active semiconductors is urgently required for practical applications. Here, with the guidance of theoretical calculations, amorphous rhodium sulfide microbowls with high enhancement factor (1 × 10⁵) and low limit of detection (10^-7 M) for rhodamine 6G are successfully developed. This remarkable sensitivity is attributed to quasi-resonance Raman effect and multiple light scattering. The first-principles calculations show that the energy gap of 4-nitrobenzenethiol adsorbed on Rh₃S₆ is greatly decreased by shifting its lowest unoccupied molecular orbital (LUMO) energy level close to the LUMO of Rh₃S₆, enabling quasi-resonance Raman effect by visible light. The finite-di

SUBMITTER: Li A 

PROVIDER: S-EPMC6260454 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature