Polytetrafluorethylene-Au as a substrate for surface-enhanced Raman spectroscopy
1 Department of Analytical Chemistry, Institute of Chemical Technology Prague, Technická 5, 16628, Prague 6, Czech Republic
2 Department of Solid State Engineering, Institute of Chemical Technology Prague, Technická 5, 16628 Prague 6, Czech Republic
Nanoscale Research Letters 2011, 6:366 doi:10.1186/1556-276X-6-366Published: 28 April 2011
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.