Raman properties of gold nanoparticle-decorated individual carbon nanotubes

Assmus, Tilman; Balasubramanian, Kannan; Burghard, Marko; Kern, Klaus; Scolari, Matteo; Fu, Nan; Myalitsin, Anton; Mews, Alf

doi:10.1063/1.2731662

Cited by 30 publications

(29 citation statements)

References 24 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 13,14,47,48 ] The spatial variation in Raman intensity may be partly attributed to the presence of such hot spots. [ 13,14,47,48 ] The spatial variation in Raman intensity may be partly attributed to the presence of such hot spots.…”

Section: Resultsmentioning

confidence: 99%

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Balasubramanian

Zuccaro

Kern

2014

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

The realization of graphene‐gold‐nanoparticle (G‐AuNP) hybrids is presented here through a versatile electrochemical approach, which allows the continuous tuning of the size and density of the particles obtainable on the graphene surface. Raman scattering from graphene, which is significantly enhanced in such hybrids, is systematically investigated as a function of the size and density of particles at the same location. In agreement with theory, it is shown that the Raman enhancement is tunable by varying predominantly the density of the nanoparticles. Furthermore, it is observed that the increase in Raman cross‐section and the strength of Raman enhancement varies as a function of the frequency of the vibrational mode, which may be correlated with the plasmonic fingerprint of the deposited AuNPs. In addition to this electromagnetic enhancement, support is found for a chemical contribution through the occurrence of charge transfer from the AuNPs onto graphene. Finally, G‐AuNP hybrids can be efficiently utilized as SERS substrates for the detection of specifically bound non‐resonant molecules, whose vibrational modes can be unambiguously identified. With the possibility to tune the degree of Raman enhancement, this is a platform to design and engineer SERS substrates to optimize the detection of trace levels of analyte molecules.

show abstract

Section: Resultsmentioning

confidence: 99%

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Balasubramanian

Zuccaro

Kern

2014

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…38 This effect was also observed on the present SWNTs decorated with gold NP aggregates, which is the subject of a separate study. 39 None of the Raman spectra recorded from the SWNT/NP hybrids displayed sizable shifts (exceeding (3 cm -1 ) in the energetic position of the D-and G′-bands of the nanotubes. This result is in contrast to earlier investigations of SWNTs deposited onto rough silver colloid substrates, 40 in which shifts of up to 8 and 24 cm -1 were detected for the D-and G′-bands, respectively.…”

Section: Resultsmentioning

confidence: 99%

Surface Enhanced Raman Scattering of Carbon Nanotubes Decorated by Individual Fluorescent Gold Particles

Scolari

Mews

et al. 2007

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Confocal optical microscopy was employed to study the effect of surface-enhanced Raman scattering on individual single-walled carbon nanotubes covered with isolated gold particles. The gold particles with diameters between 10 and 120 nm were deposited in low densities on the tubes' sidewalls by an electrochemical method. In the spectra, Raman peaks associated with the nanotubes were found to be superimposed on a broad luminescence background originating from the metal particles. With increasing particle size, both the luminescence intensity as well as the Raman enhancement increased at longer wavelengths. This finding is consistent with a size-dependent broadening of the gold plasmon frequency and a corresponding extension of the energetic range for local field enhancement on the particle surface. In addition, wavelength-dependent experiments revealed a maximum Raman intensity when both nanotube and metal particle were in optical resonance.

show abstract

“…The underlying principles of SERS in conjunction with CNTs can give rise to interesting observations. CNTs interacting with metallic nanoparticles have revealed intriguing phenomena like metal-insulator transition with visible fluorescence, [25] polarization dependent enhancement, [8] etc. However, until now, most of the SERS studies on CNTs have utilized either Ag or Au nanoparticles as substrates.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

Kumar

2009

J Raman Spectroscopy

View full text Add to dashboard Cite

Surface-enhanced Raman scattering from carbon nanotube bundles adsorbed with plasmon-tunable Ag-core Au-shell nanoparticles (Ag@Au nps) was carried out for the first time. By utilizing nanoparticles whose plasmon resonance peak (541, 642 nm) closely matches the commonly used Raman excitation sources (532, 632.81 nm), we can observe a large enhancement in the Raman signatures of carbon nanotubes. We obtain greater enhancement in the Raman signal for the above case when compared to nanotubes adsorbed with conventional Ag, Au or other 'off resonant' Ag@Au nps. The power-dependent SERS experiment on single-walled nanotubes (SWNTs) with resonant Ag@Au nps reveals a linear behavior between the G-band intensity and the photon flux density, which is in agreement with the vibrational pumping model of SERS. The observed enhancement by resonance matching is pronounced for carbon nanotubes and may lead to insights into understanding nanotube-nanoparticle interaction.

show abstract

Raman properties of gold nanoparticle-decorated individual carbon nanotubes

Cited by 30 publications

References 24 publications

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Surface Enhanced Raman Scattering of Carbon Nanotubes Decorated by Individual Fluorescent Gold Particles

Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

Contact Info

Product

Resources

About