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Polytetrafluorethylene-Au as a substrate for surface-enhanced Raman spectroscopy.

Zvátora P, Rezanka P, Prokopec V, Siegel J, Svorčík V, Král V - Nanoscale Res Lett (2011)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Analytical Chemistry, Institute of Chemical Technology Prague, Technická 5, 16628, Prague 6, Czech Republic. vladimir.kral@vscht.cz.

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.

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(a) Raman spectrum of pure BFD; (b) SERS spectrum of immobilized BFD (c = 10-2 mol/l) on the PTFE-Au; (c) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AgNP (prepared by Figure 2b); (d) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AuNP (prepared by Figure 2b); (e) Raman spectrum of pure PTFE.
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Figure 4: (a) Raman spectrum of pure BFD; (b) SERS spectrum of immobilized BFD (c = 10-2 mol/l) on the PTFE-Au; (c) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AgNP (prepared by Figure 2b); (d) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AuNP (prepared by Figure 2b); (e) Raman spectrum of pure PTFE.

Mentions: We have chosen biphenyl-4,4'-dithiol (BFD; Figure 4a) as compound for the immobilization on the PTFE foil with gold layer (PTFE-Au) due to possibility of linking it into sandwich structures. In contrast to other commercially available dithiols (i.e., ethan-1,2-dithiol, hexan-1,6-dithiol), BFD has a rigid structure that provides such orientation on the surface that the possibility of binding by both of sulfonyl groups is very improbable.


Polytetrafluorethylene-Au as a substrate for surface-enhanced Raman spectroscopy.

Zvátora P, Rezanka P, Prokopec V, Siegel J, Svorčík V, Král V - Nanoscale Res Lett (2011)

(a) Raman spectrum of pure BFD; (b) SERS spectrum of immobilized BFD (c = 10-2 mol/l) on the PTFE-Au; (c) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AgNP (prepared by Figure 2b); (d) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AuNP (prepared by Figure 2b); (e) Raman spectrum of pure PTFE.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211456&req=5

Figure 4: (a) Raman spectrum of pure BFD; (b) SERS spectrum of immobilized BFD (c = 10-2 mol/l) on the PTFE-Au; (c) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AgNP (prepared by Figure 2b); (d) SERS spectrum of immobilized BFD (c = 10-8 mol/l) on the PTFE-Au with AuNP (prepared by Figure 2b); (e) Raman spectrum of pure PTFE.
Mentions: We have chosen biphenyl-4,4'-dithiol (BFD; Figure 4a) as compound for the immobilization on the PTFE foil with gold layer (PTFE-Au) due to possibility of linking it into sandwich structures. In contrast to other commercially available dithiols (i.e., ethan-1,2-dithiol, hexan-1,6-dithiol), BFD has a rigid structure that provides such orientation on the surface that the possibility of binding by both of sulfonyl groups is very improbable.

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Analytical Chemistry, Institute of Chemical Technology Prague, Technická 5, 16628, Prague 6, Czech Republic. vladimir.kral@vscht.cz.

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.

No MeSH data available.


Related in: MedlinePlus