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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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SERS spectra of BFD on PTFE-Au for (a) 30 s, (b) 20 s, (c) 50 s, (d) 80 s, (e) 150 s, (f) 10 s sputtering time. Spectra were shifted in y-axis.
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Figure 5: SERS spectra of BFD on PTFE-Au for (a) 30 s, (b) 20 s, (c) 50 s, (d) 80 s, (e) 150 s, (f) 10 s sputtering time. Spectra were shifted in y-axis.

Mentions: For the evaluation of the dependence of sputtering time on the quality of SERS spectra we choose the band at 1078 cm-1 due to its high intensity and the possibility of easy baseline correction. The dependence of area of this signal on the sputtering time (Figure 5) showed that the maximal intensity of SERS signal was achieved using 30 s of the sputtering time (Figure 4b). According to Figure 1, at this time the layer is changing from discontinuous to continuous (see resistance). Due to this fact, when time of sputtering shorter than this is applied, the surface of gold layer is so much discontinuous that surface enhancement of Raman signals is very small and, on the contrary, after the application of longer sputtering time, the surface of gold layer is too much continuous, which leads to small enhancement because the surface has not got an optimal roughness. The analytical enhancement factor was calculated from the ratio of band intensity (1078 cm-1) of pure BFD solution (c = 1 × 10-2 mol/l) in CHCl3 and BFD (c = 1 × 10-8 mol/l) immobilized on PTFE-Au without and with nanoparticles (Table 1).


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)

SERS spectra of BFD on PTFE-Au for (a) 30 s, (b) 20 s, (c) 50 s, (d) 80 s, (e) 150 s, (f) 10 s sputtering time. Spectra were shifted in y-axis.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: SERS spectra of BFD on PTFE-Au for (a) 30 s, (b) 20 s, (c) 50 s, (d) 80 s, (e) 150 s, (f) 10 s sputtering time. Spectra were shifted in y-axis.
Mentions: For the evaluation of the dependence of sputtering time on the quality of SERS spectra we choose the band at 1078 cm-1 due to its high intensity and the possibility of easy baseline correction. The dependence of area of this signal on the sputtering time (Figure 5) showed that the maximal intensity of SERS signal was achieved using 30 s of the sputtering time (Figure 4b). According to Figure 1, at this time the layer is changing from discontinuous to continuous (see resistance). Due to this fact, when time of sputtering shorter than this is applied, the surface of gold layer is so much discontinuous that surface enhancement of Raman signals is very small and, on the contrary, after the application of longer sputtering time, the surface of gold layer is too much continuous, which leads to small enhancement because the surface has not got an optimal roughness. The analytical enhancement factor was calculated from the ratio of band intensity (1078 cm-1) of pure BFD solution (c = 1 × 10-2 mol/l) in CHCl3 and BFD (c = 1 × 10-8 mol/l) immobilized on PTFE-Au without and with nanoparticles (Table 1).

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