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Žvátora et al. Nanoscale Research Letters 2011, 6:366 http://www.nanoscalereslett.com/content/6/1/366 NANO EXPRESS Open Access Polytetrafluorethylene-Au as a substrate for surface-enhanced Raman spectroscopy Pavel Žvátora1, Pavel Řezanka1, Vadym Prokopec1, Jakub Siegel2, Václav Švorčík2 and Vladimír Král1* Abstract This study deals with preparation of substrates suitable for surface-enhanced Raman spectroscopy (SERS) applications by sputtering deposition of gold layer on the polytetrafluorethylene (PTFE) foil. Time of sputtering was investigated with respect to the surface properties. The ability of PTFE-Au substrates to enhance Raman signals was investigated by immobilization of biphenyl-4,4’-dithiol (BFD) from the solutions with various concentrations. BFD was also used for preparation of sandwich structures with Au or. | Zvatora et al. Nanoscale Research Letters 2011 6 366 http www.nanoscalereslett.eom content 6 1 366 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Polytetrafluorethylene-Au as a substrate for surface-enhanced Raman spectroscopy 1 1 1 2 2 1 Pavel Zvatora Pavel Rezanka Vadym Prokopec Jakub Siegel Václav Svorcík and Vladimir Král Abstract This study deals with preparation of substrates suitable for surface-enhanced Raman spectroscopy SERS applications by sputtering deposition of gold layer on the polytetrafluorethylene PTFE foil. Time of sputtering was investigated with respect to the surface properties. The ability of PTFE-Au substrates to enhance Raman signals was investigated by immobilization of biphenyl-4 4 -dithiol BFD from the solutions with various concentrations. BFD was also used for preparation of sandwich structures with Au or Ag nanoparticles by two different procedures. Results showed that PTFE can be used for fabrication of SERS active substrate with easy handle properties at low cost. This substrate was sufficient for the measurement of SERS spectrum of BFD even at 10-8 mol l concentration. Introduction Surface-enhanced Raman scattering SERS has great potential as an analytical technique based on the surface enhancement of Raman signals of the molecule situated on the metal surface which is nowadays currently used for the detection of various analytes at low concentration 1 . In general there are two traditional operational mechanisms to describe the overall SERS effect electromagnetic 2 and chemical 1 2 enhancement mechanism. Electromagnetic mechanism lies in the enhancement of local electromagnetic field of incident radiation applied on the molecule which is adsorbed on or situated in the close proximity to rough metal surface. In order to obtain optimal enhancement of Raman signals of the molecule it is necessary to use nanostructured surfaces or nanoparticles of noble metals with suitable physical parameters such as .
