Surface enhanced Raman spectroscopy of the liquid crystal 8CB using chip structures

被引：0

作者：

Plank, W. ^{[1
]}

Hulman, M. ^{[1
,2
]}

Kuzmany, H. ^{[1
]}

Koeck, A. ^{[2
]}

Roppert, K. ^{[2
]}

Kukovecz, A. ^{[3
]}

Krenn, J. R. ^{[4
]}

Bischof, R. ^{[4
]}

机构：

[1] Univ Vienna, Fak Phys, A-1090 Vienna, Austria

[2] Austrian Res Ctr, A-2444 Seibersdorf, Austria

[3] Appl & Environm Chem Dept, H-6720 Szeged, Hungary

[4] Karl Franzens Univ Graz, Inst Phys, A-8010 Graz, Austria

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2008年 / 245卷 / 10期

关键词：

D O I：

10.1002/pssb.200879653

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Molecular nanostructures are excellent systems to study surface enhanced Raman scattering (SERS), since monolayers or sub-monolayers are expected to provide maximum scattering enhancement. The SERS enhancement is due to a plasma induced field enhancement by metallic nanoparticles. By this effect the Raman response of molecules in the immediate neighborhood of the particles can be dramatically increased. We investigated the SERS effect of Ag colloids on glass substrates and on lithographically produced nanostructures of gold and aluminum on silicon and ITO-glass. For testing extremely thin layers (monolayers and sub-monolayers) of 4-octyl-4'-cyanobiphenyl (liquid crystal 8CB) were prepared. The observed enhancement for 8CB on Ag colloids was about 10(3). Enhancement factors for the lithographic structures were initially below 100. To increase the enhacement the Au nanostructures were coated with a 20 nm thick Ag-layer. Optimisation of the Ag nanoparticle geometry was investigated as an alternative SERS improvement routine. The viability of the chip structures for multiple usage was tested. The experimental analysis was supported by calculations of the SERS cross-section for difference structure geiometries. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2193 / 2196

页数：4

共 11 条

[1] ANOMALOUSLY INTENSE RAMAN-SPECTRA OF PYRIDINE AT A SILVER ELECTRODE [J].