摘要
Recently,various semiconductor/metal composites have been developed to fabricate surfaceenhanced Raman spectroscopy substrates.However,low metal loading on semiconductors is still a challenge.In this study,cystine was introduced to increase the accumulation of gold nanoparticles on zinc oxide,owing to the biomineralization_property of_cystine.Morphological analysis revealed that the obtained ZnO/Au/cystine composite not only had a higher metal loading but also formed a porous structure,which is beneficial for Raman performance.Compared with ZnO/Au,the ZnO/Au/cystine substrate displayed a 40-fold enhancement in the Raman signal and a lower limit of detection(10^(-11) mol·L^(-1))in the detection of rhodamine 6G.Moreover,the substrate has favorable homogeneity and stability.Finally,ZnO/Au/cystine displayed excellent performance toward crystal violet and methylene blue in a test based on river water samples.This study provided a promising method to fabricate sensitive semiconductor/noblemetal-based surface-enhanced Ramans spectroscopy substrates for Raman detection.
基金
the National Natural Science Foundation of China(Grant Nos.21621004 and 22178260)
the Tianjin Development Program for Innovation and Entrepreneurship(2018)
the Cooperative Program of Technical Center of Gongbei Customs District of China(Grant No.2020GKF-0281).
