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Fabrication and characterization and biosensor application of gold nanoparticles on the carbon nanotubes

Ghodselahi, T ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2015.07.092
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. Gold nanoparticles (Au NPs) were synthesized by co-deposition of RF-sputtering and RF-PECVD from acetylene gas and Au target on the carbon nanotubes (CNTs). The CNTs were prepared by thermal chemical vapor deposition (TCVD) and Pd nanoparticles catalyst. TEM image shows that high-density and uniform distribution of Au NPs were grown on the CNTs. XRD analysis indicates that Au NPs have fcc crystal structure and CNTs have a good graphite structure. Raman spectroscopy results suggest that our sample includes double-walled CNTs. It is resulted that intensity of D-band reduces and G-band intensity raises and radial breathing mode (RBM) is changed by immobilizing of Au NPs on the CNTs. Raman results that the free electrons on the CNTs increase by immobilizing of Au NPs. Also localized surface plasmon resonance (LSPR) peak of Au NPs has red-shift and broadens when it is immobilized on the CNTs. The change in LSPR peak rises from decreasing of local electrons density on the Au NPs surface. Raman and LSPR spectroscopy suggest that there are charge transferring and chemical bonds between Au NPs and CNTs. We applied the prepared sensor chips of Au NPs
  6. Keywords:
  7. Localized surface plasmon resonance (LSPR) ; Bond strength (chemical) ; Carbon ; Carbon nanotubes ; Chemical vapor deposition ; Crystal structure ; Deposition ; Fiber optic sensors ; Gold alloys ; Metal nanoparticles ; Nanoparticles ; Nanotubes ; Plasmons ; Surface plasmon resonance ; Synthesis (chemical) ; Vapor deposition ; Yarn ; Biosensor applications ; Fabrication and characterizations ; Femtomolar concentration ; Gold Nanoparticles ; Radial breathing mode ; Thermal chemical vapor deposition ; Uniform distribution ; Gold ; Palladium
  8. Source: Applied Surface Science ; Volume 355 , November , 2015 , Pages 1175-1179 ; 01694332 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0169433215016591