Facile fabrication of hierarchical diamond-based AuNPs-modified nanocomposites via layer-by-layer assembly with enhanced catalytic capacities

The diamond-based hierarchical AuNPs-modified nanocomposites materials were prepared via the synthesis of diamond@graphite building block and polyallylamine hydrochloride (PAH)/polyacrylic acid (PAA) layer-by-layer (LbL) assembled strategy. And the modified gold nanoparticles were carried out by the reduction of aqueous HAuCl 4 solution using the reductant NaBH 4 . The obtained layer-by-layer nanocomposites demonstrate obvious advantages such as high specific surface area, pore diameter and pore volume, providing a higher chance of gold nanoparticles accessible to the reactants. Thus the core–shell nanostructures from of LbL-assembled and diamond-based composite materials are beneficial to improve the catalytic capacity of gold nanoparticles and separation rate from the reactants. In order to testify the enhancement of hierarchical diamond-based AuNPs-modified nanocomposites catalytic activity and utility, the catalytic experiments of 4-nitrophenol solution were well accomplished. The prepared nanocomposites exhibited high activity and demonstrated high recyclability without less weight of gold nanoparticles after eight runs of catalysis reduction of 4-nitrophenolm showing potential application in composite catalytic materials.