Metallic and bi-metallic nanoparticles like gold, platinum, palladium, Au-Pt and Au-Pd of specific size immobilized on solid support has seen remarkable growth due to their different potential applications. Thus, there is a considerable interest for investigating a general preparative route to engineer aggregation-resistant metallic nanoparticles for various applications. The present study deals with in situ formation of two-dimensional assemblies of metallic and bi-metallic nanoparticles on functionalized surfaces. Electrochemical investigations of these nanoparticles revealed a highly efficient catalytic activity for many long-chain and poly alcohols including methanol, ethanol, 1-propanol, 2-propanol, ethylene glycol, and glycerol. In another application of this in situ metal nanoparticle synthesis, gold and palladium nanoshells have been synthesized successfully by reducing surface bound palladium and gold ions onto ~200 nm diameter silica core. The method for generating such nanoshells is based on seed-mediated growth technique. This present method reports the first time synthesis of palladium nanoshell from surface bound palladium nanoparticles seeds compare to earlier reports that use gold nanoparticles as seed to generate final palladium shell. In addition, the current study also involves synthesis of gold nanoshells on silica cores that are less than 100 nm diameter. Previous work has shown the successful synthesis of gold nanoshell on a ~200 nm silica core using the present seed mediated synthesis procedure. Gold nanoshells with a smaller core may find increased application in photo-thermal therapeutic studies. Finally, palladium nanoparticle assemblies generated on indium tin oxide (ITO) coated glass surfaces are applied towards detection of Dopamine (DA), an important neurotransmitter in the mammalian central nervous system. The sensing performance of the present biosensor is measured electrochemically using differential pulse voltammetry (DPV) and impedance spectroscopy, at different concentrations of dopamine in solution. The biosensor has shown a remarkably low detection limit for DA and a linear response over a wide concentration range. In addition, specificity of this biosensor for DA detection is also explored in presence of ascorbic acid (AA).

In situ generated metal nanoparticles as two-dimensional assemblies, core-shell structure and biosensor

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.