• Probing the bilayer-monolayer switching of capping agents on Au nanorods and its interaction with guest molecules

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      https://www.ias.ac.in/article/fulltext/jcsc/130/10/0138

    • Keywords

       

      Isothermal titration calorimetry; surface-enhanced Raman scattering; gold nanorods; electrostatic interactions.

    • Abstract

       

      The anisotropic features of Au nanorods make them an attractive nanoscale precursor for the design of higher order nanostructured materials. However, the mode of interaction of various molecular systems on Au nanorods is not well-understood. In the present study, we have employed isothermal titration calorimetry and surface-enhanced Raman scattering for understanding various types of interactions of functional molecules on the surface of gold nanorods. The binding of thiol-bearing analyte molecules is effective with the surface of goldnanorods in acetonitrile-rich solvents and found to be weak in an aqueous medium. The effective interaction of thiol-bearing analyte molecules on nanorods is facilitated by the breakdown of cetyltrimethylammonium bromide bilayer to a monolayer in organic-rich solvent systems, thereby resulting in appreciable signals in isothermal titration calorimetry and surface-enhanced Raman spectra. The electrostatic interaction of analyte molecule is mainly driven by the charge reversal on the surface of Au nanorods on switching the solvent from aqueous to organic medium. Thus, based on isothermal titration calorimetry and surface-enhanced Raman scattering investigations, it is established that the microheterogeneous environment around the Au nanorods plays a crucial role in driving the interaction of analyte molecules.

    • Author Affiliations

       

      JATISH KUMAR1 2 K GEORGE THOMAS1

      1. School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram, Kerala 695 551, India
      2. CSIR –National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala 695 019, India
    • Dates

       
  • Journal of Chemical Sciences | News

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