Covalently attached multilayer assemblies of citrate-capped colloidal gold nanoparticles and diazo-resins

By using an ionic layer-by-layer self-assembly technique, the fabrication of highly stable diazo-resins/colloidal gold nanoparticles multilayer films on quartz wafer, Si slide and glassy carbon electrodes (GCEs) was achieved by the UV irradiation of layer-by-layer self-assemble multilayer films consisting of diazo-resins (DAR) and citrate-capped colloidal gold nanoparticles. UV irradiation converted the electrostatic interaction into covalent bonds at the interfaces. These fabricating processes were followed and further confirmed by UV–vis spectrometry, Fourier transform infrared spectrometer (FTIR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The obtained thin films were also characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM). The results show that these assemblies of colloidal gold nanoparticles multilayer films are highly stable and can be kept for a long time, only being removed by physical scrape.