writer：Rui Xu, Ruilong Li, Liyang Jia, Zhuo Zheng, and Tao Zhou*
keywords：Laser-induced; selective metallization; polymer; SERS; ultra-high sensitivity; R6G
source：期刊
specific source：ACS Sustainable Chemistry & Engineering, 2021, 9, 5038?5049
Issue time：2021年

A simple, low-cost, and reliable strategy

was developed to prepare SERS substrates with ultra-high sensitivity using laser-induced selective metallization of polymers combined

with an improved galvanic replacement reaction. To verify the SERS activity,

organic analytes, such as Rhodamine 6G (R6G), crystal violet (CV), and methylene

blue (MB), were selected as the probe molecules. Surprisingly, the detection

limit of R6G reached as low as 1×10-17 M in SERS tests with the

excitation wavelength of 532 nm, which was superior to the data reported in

most literature, indicating an ultra-high SERS sensitivity. XPS, WAXD, SEM, and

EDS revealed that evenly distributed nanoparticles with 203 nm based on the

Cu-Ag alloy were successfully formed on the Cu layer of the polymer. Besides, the

RSD values of the main characteristic peaks of R6G were less than 0.20, showing

a good reproducibility of the prepared SERS substrate. This SERS substrate also

demonstrated good stability because it still kept a high SERS sensitivity after

35 days of air storage. Moreover, this new substrate showed the potential for

reuse and probably addressed the problem that the traditional SERS substrate

can only be used once. We believe this facile and reliable approach to preparing

new SERS substrate will have prospects for large-scale production and

applications in the field of analytics.