Immobilization of biogenic gold nanoparticles in thermally evaporated fatty acid and amine thin films

S. Shiv Shankar, Absar Ahmad, Renu Pasricha, M. Islam Khan, Rajiv Kumar, Murali Sastry

Research output: Contribution to journalArticlepeer-review


We have recently demonstrated the biological synthesis of gold nanoparticles by the reduction of aqueous chloroaurate ions by the fungus Fusarium oxysporum and with extract of geranium (Pelargonium graveolens) leaf. In this paper, we demonstrate the immobilization of biogenic gold nanoparticles in lipid thin films deposited by thermal evaporation. The charge on the gold nanoparticles synthesized by both the fungus and the geranium plant extract is used to facilitate their immobilization in both anionic and cationic lipid thin films. A rough estimate of the isoelectric point of the proteins capping the gold nanoparticles synthesized using the fungus could be made by pH-dependent microgravimetry studies of the immobilization process. An interesting size and shape selectivity in the immobilized gold nanoparticles is observed in the lipid thin films. The biogenic gold nanoparticle-lipid composite films were characterized using quartz crystal microgravimetry, UV-vis absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and transmission electron microscopy.

Original languageEnglish (US)
Pages (from-to)69-75
Number of pages7
JournalJournal of Colloid And Interface Science
Issue number1
StatePublished - Jun 1 2004


  • Capped nanoparticles
  • Gold
  • Immobilization
  • Lipid films
  • Shape selectivity
  • Size selectivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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