The incorporation of gold nanoparticles (Au NPs) on graphene (G) is as valuable strategy to produce plasmonic effects that lead to the enhancement of optical absorption, resulting in improved performance of optoelectronic devices. The decoration of G layers by direct reduction of Au3+ to Au NPs using the chemical functionalities on G surface is preferred since it can result in a huge number of interactions stabilizing Au NPs. The combination of G with polymeric matrices able to act as reducing and capping agents is a successful strategy to achieve this objective. Herein, we demonstrate that both a polymeric cationic cyclodextrin (PolyCD) and the cyclodextrin units grafted on graphene layers (GCD) can be bridged, in a supramolecular assembly, through the new synthesized pegylated bis-adamantane carboxamide (BisAda) that acts as a “guest bridge”. Moreover, the cyclodextrin functionalities, such as hydroxyl groups, amino groups, hemiacetal groups, act as reductant and stabilizer for the synthesis of Au NPs in an eco-friendly way, alternative to the traditional chemical-reducing methods. Accordingly, the PolyCD@Bis-Ada@GCD assembly was decorated in situ with Au NPs by simple addition of PolyCD@BisAda@GCD to a boiling aqueous solution of Tetrachloro-auric(III) acid.
Giulia Neri, Annalaura Cordaro, Angela Scala, Massimiliano Cordaro, Antonino Mazzaglia, Anna Piperno,
PEGylated bis-adamantane carboxamide as guest bridge for Graphene poly-Cyclodextrin Gold Nanoassemblies, Journal of Molecular Structure, 2021, 130519,