Construction of Two-Dimensional Arrays Gold Nanoparticles Monolayer onto Boron-Doped Diamond Electrode Surfaces

A novel method has been developed to immobilize macroscopic two-dimensional arrays of Au nanoparticles (AuNPs) onto the surfaces of boron-doped diamond (BDD) electrodes. These AuNP-modified surfaces are prepared by self-assembly of differently sized colloidal Au particles onto the BDD surfaces. A dense and well-distributed AuNP monolayer onto the BDD surfaces was obtained by pretreating the BDD surface with allylamine by photochemical reaction. These modified surfaces have been characterized by XPS, SEM, and electrochemical cyclic voltammetry (CVs). SEM data indicated that the AuNPs are immobilized and well-dispersed, forming a uniform monolayer on the amine-terminated activated BDD surfaces in two dimensions. Cyclic voltammtric (CV) results indicate that the immobilized AuNPs monolayer onto BDD electrode shows excellent electrochemical properties, implying facile electrochemical communication between the AuNPs monolayer and BDD substrate through the amine linkers.