Doping and metallic-support effect evidenced on SERS spectra of polyaniline thin films

Baibarac, M.; Mihuţ, L.; Louarn, G.; Lefrant, S.; Baltog, I.

doi:10.1002/1099-0488(20001001)38:19<2599::aid-polb120>3.0.co;2-y

Cited by 28 publications

(29 citation statements)

References 28 publications

(32 reference statements)

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“…Both groups of spectra recorded on Ag and Au substrates exhibit two bands at 1330 and 1370 cm À1 that grow with the SWNT content. As was noticed in early papers, this is the Raman signature of the PANI salt [218]. Great similarities are observed in Figure 5.15 between FTIR spectra of PANI/ SWNTs (curves S 1 -S 3 ) and PANI/C 60 composites (F 1 -F 3 ), and those of the polyaniline-binding of voluminous carbon particles as nanotubes and large fragments of nanotubes to the polymer chain.…”

Section: Conducting Polymers Doped With Carbon Nanotubessupporting

confidence: 77%

“…The G band, associated with tangential vibrational modes, reveals, in this case, the sum of contributions coming from SWNTs, nanotube fragments, and polymer/CNT (whole units and fragments) composites. The differences between SERS spectra of PANI deposited on Au and Ag substrates originates in the different reducing properties of the metal substrates [218]. A significant change in shape and Raman line positions is noted in the SERS spectra of composites of the S type in Figure 5.14.…”

Section: Conducting Polymers Doped With Carbon Nanotubesmentioning

confidence: 95%

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Composites Based on Conducting Polymers and Carbon Nanotubes

Baibarac

Baltog

Lefrant

2010

Nanostructured Conductive Polymers

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Section: Conducting Polymers Doped With Carbon Nanotubessupporting

confidence: 77%

Section: Conducting Polymers Doped With Carbon Nanotubesmentioning

confidence: 95%

Composites Based on Conducting Polymers and Carbon Nanotubes

Baibarac

Baltog

Lefrant

2010

Nanostructured Conductive Polymers

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“…An enhanced Raman signal can still be observed with films of 150 nm thickness. 23,29,54,55 The chemical transformation of the nanotubes is well illustrated in Fig. 9 by the changes in the radial and tangential bands as a function of the excitation wavelength and the concentration of sulfuric acid.…”

Section: Sers Studies On Chemically Transformed Swnts Sers Studies Onmentioning

confidence: 84%

Surface‐enhanced Raman scattering studies on chemically transformed carbon nanotube thin films

Lefrant

Baltog

Baibarac

2005

J Raman Spectroscopy

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We review our experimental data obtained by Raman spectroscopy on single-walled carbon nanotubes (SWNTs) using surface-enhanced Raman scattering (SERS). We focused on the study of the dependence of the SERS spectra of SWNTs on both the rough metallic substrate type and the film thickness. In particular, we show that degradation of the nanotubes, mainly metallic, occurs for very thin films with the formation of graphitic, fullerene-like or amorphous carbon particles. We show also that SWNTs reacting with H 2 SO 4 form a salt of the hydrogensulfate type similar to that resulting from graphite-H 2 SO 4 interaction. SWNTs exhibit a complicated spectroelectrochemical behavior in aqueous and non-aqueous H 2 SO 4 solutions that depends also on the sweep potential range. We demonstrate that the oxidation-reduction processes have a quasi-reversible or irreversible character. Finally, SERS studies on compressed SWNTs in different host matrices, inorganic and organic, reveal nanotube breaking and that tube fragments may react or not with the host matrix used.

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“…In parallel, many approaches were proposed to optimize and control the surface-enhanced Raman scattering efficiency of colloidal AuNPs assembled on substrates into 2D nanostructures [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

et al. 2013

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Surface-enhanced Raman spectroscopy (SERS) has enormous potential for a range of applications where high sensitivity needs to be combined with good discrimination between molecular targets. However, the SERS technique has trouble finding its industrial development, as was the case with the surface plasmon resonance technology. The main reason is the difficulty to produce stable, reproducible, and highly efficient substrates for quantitative measurements. In this paper, we report a method to obtain two-dimensional regular nanopatterns of gold nanoparticles (AuNPs). The resulting patterns were evaluated by SERS. Our bottom-up strategy was divided into two steps: (a) nanopatterning of the substrate by e-beam lithography and (b) electrostatic adsorption of AuNPs on functionalized substrates. This approach enabled us to highlight the optimal conditions to obtain monolayer, rows, or ring of AuNPs, with homogeneous distribution and high density (800 AuNPs/μm 2 ). The nanostructure distributions on the substrates were displayed by scanning electron microscopy and atomic force microscopy images. Optical properties of our nanostructures were characterized by visible extinction spectra and by the measured enhancements of Raman scattering. Finally, we tried to demonstrate experimentally that, to observe a significant enhancement of SERS, the gold diffusers must be extremely closer. If electron beam lithography is a very attractive technique to perform reproducible SERS substrates, the realization of pattern needs a very high resolution, with distances between nanostructures probably of less than 20 nm.

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Doping and metallic-support effect evidenced on SERS spectra of polyaniline thin films

Cited by 28 publications

References 28 publications

Composites Based on Conducting Polymers and Carbon Nanotubes

Composites Based on Conducting Polymers and Carbon Nanotubes

Surface‐enhanced Raman scattering studies on chemically transformed carbon nanotube thin films

Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

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