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Comparison of different strategies for the assembly of gold colloids onto Fe3O4@SiO2 nanocomposite particles

Mohammad Beigi, H ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physe.2013.01.004
  3. Publisher: 2013
  4. Abstract:
  5. Three strategies were employed for the assembly of gold nanoparticles on silica-coated magnetite particles (SCMPs). In strategy I, citrate-coated gold nanoparticles were attached on the surface of amine-SCMPs. In strategy II, amine-SCMPs were coated with carboxylated gold nanoparticles via amide bond formation. In strategy III, the thiol-SCMPs surface was coated with gold nanoparticles. Among the above examined strategies, coating amine-SCMPs with gold nanoparticles via strategy I resulted in a better coverage and stronger intensity of absorption bands. Furthermore, results obtained through strategy I showed that decreasing the pH of the solution from 7 to 3 leads to a further red-shift of the plasmon absorption peak for the prepared particles. Moreover, the effect of amine-SCMPs' zeta potential on the coverage with citrate-coated gold nanoparticles was studied. The results revealed that increasing the EDS concentration from 25 to 90 mM results in a higher coverage of gold nanoparticles on the SCMPs surface
  6. Keywords:
  7. Plasmon absorption ; Core/shell/shell structure ; Magnetite nanoparticles ; Silica ; Amide bond formation ; Gold colloid ; Magnetite particles ; Nano-composite particle ; Gold nanoparticles ; Red shift ; Amides ; Magnetite nanoparticles ; Metal nanoparticles ; Organic compounds ; Zeta potential ; Gold
  8. Source: Physica E: Low-Dimensional Systems and Nanostructures ; Volume 49 , 2013 , Pages 30-38 ; 13869477 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1386947713000064