2026-10-15T03:49:07Z https://www.scidb.cn/oai

10.57760/sciencedb.05523 2022-10-27T16:09:39Z

2022-10-27 Assembling PVP-Au NPs as portable chip for sensitive detection of cyanide with surface-enhanced Raman spectroscopy doi:10.57760/sciencedb.05523 en Cyanide (C≡N) can lead to blood, cardiovascular system, and nervous system disorders owing to the acute and chronic toxicity; thus, aiming at the group or individual poisoning incidents, it is necessary to develop the sensitive and credible method for rapid on-site detection of poisons cyanide. Surface-enhanced Raman spectroscopy (SERS) with the advantages of providing fingerprint information of target molecules and single-molecules sensitivity has been widely used in on-site analysis; however, the SERS measurements always suffer from the problem of the stability of substrates. Here, the polyvinylpyrrolidone (PVP)-stabilized Au NPs (PVP-Au NPs) have been assembled through the simple, convenient evaporation-induced strategy with the large-scale hotspots substrates. The presence of PVP can not only facilitate the assembly of Au NPs but also prevent the corrosion of CN− towards the Au NPs with the formation of [Au (CN)2]−1, providing high stable and reproducible SERS signals. Moreover, the PVP-Au NPs have been assembled on the Si wafer to fabricate the portable SERS chip for rapid on-site detection of CN− with an RSD of 5.8% and limitation of 100 ppb. Furthermore, by coupling a portable Raman spectrometer, the SERS spectra of CN− spiked into different specimens to simulate the poison samples have been collected and analyzed on SERS chips with the recovery of 89–103% and RSD not higher than 11.3%. Consequently, the fabricated SERS chip with assembled PVP-Au NPs can provide sensitive and credible detection for CN− in different specimens, and then would satisfy the rapid on-site evaluation of CN− in poisoning incidents with the portable Raman spectrometer. PVP-Au NPs; Evaporation-induced assembly; Cyanide; Public security Li Penghui Li Pan Tan Xuecai Wang Junping Zhang Yunfeng Han Heyou Yang Liangbao PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1007/s00216-020-02517-8 Science Data Bank