Ag Nanoparticle/Au@Ag Nanorod Sandwich Structures for SERS-Based Detection of Perfluoroalkyl Substances

作者：Feng, Yating; Dai, Jiaxue; Wang, Chuyun; Zhou, Hongyang; Li, Jianhua; Ni, Gang; Zhang, Maofeng^*; Huang, Youju^*

来源：ACS Applied Nano Materials, 2023, 6(15): 13974-13983.

DOI：10.1021/acsanm.3c01815

• surface-enhanced Raman scattering (SERS)
• perfluoro-and polyfluoroalkyl substances
• sandwich structure
• self-assembly
• sensitive identification
• quantitativedetection

Perfluoro- and polyfluoroalkyl substances (PFAS) arewidely usedthroughout the world and are extensively found in the environment.The detection of PFAS has become essential to ensuring environmentalsustainability and human health. Herein, AuNRs were synthesized bythe seed growth method and then the samples were coated with silvershells to form Au@Ag core-shell nanorods (Au@AgNRs). Au@AgNRsmonolayer was prepared by oil-water self-assembly on a siliconwafer and then was constructed as a plasmonic AgNPs/Au@AgNRs sandwichstructure for surface-enhanced Raman scattering (SERS) detection ofPFAS. The shell thickness of Au@AgNRs was optimized and displayeda 11.9-fold SERS intensity higher than the pristine AuNRs. Moreover,the hotspots generated by the electromagnetic field coupling betweenthe interlayer gap achieved 3.6-fold SERS signal enhancement comparedto that of the Au@AgNRs monolayer. Besides, the excellent structuraluniformity (RSD & SIM; 8.0%) makes it ideal for quantitative SERSdetection applications. More importantly, the use of the AgNPs/Au@AgNRssandwich structure sensor enables the highly sensitive detection ofmodel molecules (10(-11) M) and quantitative detectionof a wide range of fluorinated alkyl substances of perfluorooctanoicacid (PFOA), perfluorohexanoic acid (PFHxA), and potassium perfluoro-butanesulfonate(PPFBS), even with a portable Raman device. And the detection concentrationcan be down to 0.1 ppm for PFAS. This sensitive and quantitative SERStechnique has promising prospects in the monitoring of fluorinatedalkyl substance contaminations.

• 单位
  杭州师范大学