文献类型：期刊文献

英文题名：Surface-enhanced Raman scattering on gold quasi-3D nanostructure and 2D nanohole arrays

作者：Yu, Qiuming[1];Braswell, Scott[1];Christin, Brian[1];Xu, Jiajie[1,2];Wallace, Paul M.[1];Gong, Heng[2];Kaminsky, Dmitry[1]

机构：[1]Univ Washington, Dept Chem Engn, Ctr Nanotechnol, Seattle, WA 98195 USA;[2]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：21

期号：35

外文期刊名：NANOTECHNOLOGY

收录：;EI(收录号：20104213297175);WOS:【SCI-EXPANDED(收录号:WOS:000280742000005)】；

基金：This work was supported in part by the University of Washington (UW) faculty start-up funds. JJX acknowledges a fellowship from the China Scholarship Council. DK was partially supported by the Research Experience for Undergraduate (REU) fellowship through the National Nanotechnology Infrastructure Network (NNIN) supported by the NSF. Nanofabrication and SERS studies were performed at the Nanotech User Facility, the NNIN UW site.

语种：英文

外文关键词：Molecules - Plasmonics - Substrates - Gold - Surface scattering - Raman scattering - Finite difference time domain method - Microchannels - Electric fields - Nanostructures

摘要：A new method was developed to fabricate unique gold quasi-3D plasmonic nanostructures on poly(dimethylsiloxane) PDMS and 2D nanohole arrays on silicon as surface-enhanced Raman scattering (SERS) substrates using electron beam lithography (EBL) with negative tone resist Ma-N 2403 and soft lithography. The size and shape of nanopillars fabricated by EBL were well controlled via different beam conditions. An enhancement factor (EF) as high as 6.4 x 10(5) was obtained for 4-mercaptopyridine molecules adsorbed on the gold quasi-3D nanostructure array on PDMS with 400 nm diameter, 100 nm spacing and 300 nm depth, while no enhancement was observed for the gold 2D nanohole array on silicon with the same diameter and spacing. The experimental results were confirmed by finite-difference time-domain (FDTD) calculations. Furthermore, the calculated total electric fields showed that the strong SERS exhibited by the gold quasi-3D nanostructure arrays on PDMS is due to the strong localized electric fields at the gold-air interface of the bottom gold nanodisc. The strong and reproducible SERS spectroscopy for molecules adsorbed on precisely controlled gold quasi-3D nanostructure arrays on PDMS makes it possible for the integration of SERS-active nanopatterns into microfluidic devices as chemical and biological sensors with molecular specificity.