In this work, we report a facile synthesis method for NDs-Au@AgNPs surface-enhanced Raman scattering(SERS) substrate using Au seeds prepared by nitrogen-rich quantum dots(NDs). As a new member of quantum-dots family, ...In this work, we report a facile synthesis method for NDs-Au@AgNPs surface-enhanced Raman scattering(SERS) substrate using Au seeds prepared by nitrogen-rich quantum dots(NDs). As a new member of quantum-dots family, NDs are rich in nitrogen and oxygen-containing functional groups and therefore can be used as an efficient reducing and stabilizing agent for the synthesis of AuNPs. The NDs-Au@AgNPs with core-shell structures was synthesized by seed-mediated growth method in presence of NDs-AuNPs seeds and exhibited high SERS activity with a high SERS enhancement factor of 10~7. The NDs-Au@AgNPs SERS substrate was effectively used for the recognition and detection of isomers of meta, ortho and para nitroanilines, while commercial SERS substrate cannot. In addition, the possible adsorption behavior was further studied, which is of great significance for the related work about differentiation of isomers and the mechanism of SERS enhancement.展开更多
基金supported by the National Natural Science Foundation of China(Nos. 21675178, 21475153 and 21575167)the Natural Science Foundation of Guangdong Province, China (No. 2016A030313358)+1 种基金the Special Funds for Public Welfare Research and Capacity Building in Guangdong Province of China (No. 2015A030401036)the Guangzhou Science and Technology Program of China (No. 201604020165),respectively
文摘In this work, we report a facile synthesis method for NDs-Au@AgNPs surface-enhanced Raman scattering(SERS) substrate using Au seeds prepared by nitrogen-rich quantum dots(NDs). As a new member of quantum-dots family, NDs are rich in nitrogen and oxygen-containing functional groups and therefore can be used as an efficient reducing and stabilizing agent for the synthesis of AuNPs. The NDs-Au@AgNPs with core-shell structures was synthesized by seed-mediated growth method in presence of NDs-AuNPs seeds and exhibited high SERS activity with a high SERS enhancement factor of 10~7. The NDs-Au@AgNPs SERS substrate was effectively used for the recognition and detection of isomers of meta, ortho and para nitroanilines, while commercial SERS substrate cannot. In addition, the possible adsorption behavior was further studied, which is of great significance for the related work about differentiation of isomers and the mechanism of SERS enhancement.
