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Journal of Chemical Sciences

, 130:138 | Cite as

Probing the bilayer-monolayer switching of capping agents on Au nanorods and its interaction with guest molecules\(^{\S }\)

  • Jatish Kumar
  • K George Thomas
Regular Article
  • 57 Downloads

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 gold nanorods 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.

Graphical Abstract:

SYNOPSIS Cetyltrimethylammonium bromide on Au nanorod exists as a bilayer in water and as a monolayer in aqueous-organic medium, which in turn influences the surface charge and plays a crucial role in driving the substrate-analyte interactions.

Keywords

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

Notes

Acknowledgements

JK acknowledges the Council of Scientific & Industrial Research (CSIR), India, for the fellowship. KGT acknowledges the Department of Science and Technology (DST Nanomission Project; SR/NM/NS-23/2016), Government of India for financial support and the J. C. Bose National Fellowship of DST.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)Vithura, ThiruvananthapuramIndia
  2. 2.CSIR –National Institute for Interdisciplinary Science and TechnologyThiruvananthapuramIndia

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