Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform

Nanomaterials

卷:9

VoThi Nhat Linh¹  Sung-Gyu Park¹  Dong-Ho Kim¹  HoSang Jung¹  ChaeWon Mun¹  Jung-Dae Kwon¹ 

[1] Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon 51508, Korea;

关键词: hotspots;    localized surface plasmon resonance;    molecular filtration;    surface-enhanced Raman spectroscopy;    sensors;   

DOI  :  10.3390/nano9040619

来源: DOAJ

【 摘 要 】

This paper reports a highly sensitive and selective surface-enhanced Raman spectroscopy (SERS) sensing platform. We used a simple fabrication method to generate plasmonic hotspots through a direct maskless plasma etching of a polymer surface and the surface tension-driven assembly of high aspect ratio Ag/polymer nanopillars. These collapsed plasmonic nanopillars produced an enhanced near-field interaction via coupled localized surface plasmon resonance. The high density of the small nanogaps yielded a high plasmonic detection performance, with an average SERS enhancement factor of 1.5 × 10⁷. More importantly, we demonstrated that the encapsulation of plasmonic nanostructures within nanofiltration membranes allowed the selective filtration of small molecules based on the degree of membrane swelling in organic solvents and molecular size. Nanofiltration membrane-encapsulated SERS substrates do not require pretreatments. Therefore, they provide a simple and fast detection of toxic molecules using portable Raman spectroscopy.

【 授权许可】

Unknown