A facile route to the hierarchical assembly of Au nanoparticles on carbon nanotubes through Cu2+ coordination for surface-enhanced Raman scattering

摘要

We report the hierarchical assembly of Au nanoparticles on carboxylized carbon nanotubes (c-CNTs) through Cu2+ coordination.This route is facile and green,and can easily control the loading density of Au nanoparticles.The c-CNT matrix ensures uniform distribution ofAu nanoparticles,which is particularly important for the enrichment of hot spots while preventing their serious agglomeration.Moreover,the c-CNT matrix also contributes to the electromagnetic enhancement due to its surface plasmon resonance,and the chemical enhancement due to the adsorption of the target molecules.The resulting Au@c-CNT nanohybrids exhibit a remarkable synergy in SERS compared to neat Au nanoparticles.