Bismuth oxybromide based novel substrate for surface enhanced Raman spectroscopy

Abstract

Bi24O31Br10 powders were prepared through calcination at 500 ⁰C by chemical precipitation method. Relative Raman peak intensity enhancement after annealing at different temperature was observed along with new characteristic feature that confirm the phase stability of Bi24O31Br10 powders. The as-synthesized sample exhibited excellent SERS activity with rhodamine B (RhB), 4-nitrophenol (4-NP) and methyl orange (MO) as probe molecules. The minimum detectable concentration was 20 µM for RhB, 100 µM for 4-NP and 100 µM for MO. Moreover, the remarkable enhancement was obtained with the ethanol solvent as compared to water for the SERS detection of RhB with 785 nm laser excitation. Multi-molecular detection was also successfully carried out. © 2022 Elsevier B.V.