期刊
MATERIALS EXPRESS
卷 10, 期 5, 页码 687-693出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/mex.2020.1683
关键词
Cu-Ag Core-Shell Nanostructure; Surface Enhanced Raman Spectroscopy; Caffeic Acid; 4-Mercaptophenylboronic Acid (4-MPBA); SERS Probe
Core-shell nano-metal structures as SERS probes have drawn attention and have been applied to detecting analytes at low concentrations. Here, we have developed a novel SERS probe composed of Cu-Ag for the quantitative, rapid and ultrasensitive detection of caffeic acid. The surface of Cu-Ag was modified with 4-mercaptophenylboronic acid (4-MPBA) to allow the probe to detect caffeic acid, wherein 4-MPBA specifically binds to caffeic acid by an esterification reaction. The results obtained in this work show that the SERS performance of the 4-MPBA substrate is better than that of the Cu-Ag substrate. To determine the binding of caffeic acid to 4-MPBA, the B-OH stretching vibration at 1170 cm(-1) was selected as the representative signal. It was found that there is a linear relationship between the intensity of the peak at 1170 cm(-1) and the concentration of caffeic acid.
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