Silver Nanopartical over AuFON Substrate for Enhanced Raman Readout and Their Application in Pesticide Monitoring

Molecules

卷:20

Suhong Chen¹  Zhen Rong¹  Rui Xiao¹  Kun Guo¹  Qiqi Liu¹  Chaoguang Wang²  Lin Ye³  Xiaoye Zhang⁴ 

[1] Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases,Beijing Institute of Radiation Medicine, Beijing 100850, China;

[2] College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China;

[3] Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun 130021, China;

[4] School of Pharmaceutical Sciences, Jilin University, Changchun 130021, China;

关键词: SERS;    Ag NPs;    Au film over nanosphere;    hybrid substrate;    trace chemical detection;   

DOI  :  10.3390/molecules20046299

来源: DOAJ

【 摘 要 】

Surface-enhanced Raman detection of thiram is demonstrated by usingAg-nanoparticles (Ag NPs) on Au film over nanosphere (AuFON) substrate as the hybrid substrate. The SERS signal of the Ag NPs attached to solid supports is studied. The close coupling together of thousands of Ag NPs on AuFON leads to the generation of hot spots for SERS. The Ag NPs on AuFON can be applied to detect rhodamine-6G (R6G) with the detection limitation of 10−11 M and the pesticide thiram in acetone with a detection limit of as low as 0.24 ppm, which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). The hybrid substrates are shown to be highly sensitive for the detection of thriam, which produce highly enhanced Raman signals with good uniformity and reproducibility due to having plenty of hot spots on its surface.

【 授权许可】

Unknown