Raman spectroscopy for probing covalent functionalization of single-wall carbon nanotubes bundles with gold nanoparticles

A hybrid system made of single-wall carbon nanotube bundles (average diameter of approximately 20 nm and length of several tens of nanometers) highly covered with gold nanoparticles (average diameter of 5 nm) was prepared through the functionalization of the nanotube surface with 4,4′-thiobisbenzene...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2014-05, Vol.16 (5), p.1-12, Article 2415
Main Authors: Otubo, Larissa, Ferreira, Odair Pastor, Filho, Antonio Gomes Souza, Alves, Oswaldo Luiz
Format: Article
Language:English
Subjects:
Bundles
Carbon nanotubes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Decoration
Exact sciences and technology
Fullerenes and related materials
Gold
Infrared and raman spectra and scattering
Inorganic Chemistry
Lasers
Materials Science
Nanocrystalline materials
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Nanotechnology
Nanotubes
Optical Devices
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optics
Photonics
Physical Chemistry
Physics
Raman spectroscopy
Research Paper
Single wall carbon nanotubes
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Summary:A hybrid system made of single-wall carbon nanotube bundles (average diameter of approximately 20 nm and length of several tens of nanometers) highly covered with gold nanoparticles (average diameter of 5 nm) was prepared through the functionalization of the nanotube surface with 4,4′-thiobisbenzenethiol molecules followed by the anchoring of gold nanoparticles. The decoration of single wall carbon nanotubes with gold nanoparticles was performed using two different methods, named as ex situ and in situ, which refer to the gold reduction before or during the contact with the nanotubes, respectively. Transmission electron microscopy images showed that both methods lead to a successful decoration of the single wall carbon nanotube bundles, although different density of gold nanoparticles covering the bundles was observed to depend on the reaction methods. Resonance Raman spectroscopy data were used to follow the electronic changes of the carbon nanotubes after gold nanoparticles loading and confirmed the strong interactions of the gold nanoparticles with the 4,4′-thiobisbenzenethiol molecules and the carbon nanotubes. This interaction was probed in the Raman spectrum which unveiled a surface enhancement Raman effect of the thiol molecule Raman signals, not observed before the attachment of metallic nanoparticles onto 4,4′-thiobisbenzenethiol functionalized carbon nanotubes.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-014-2415-1