CYCLIC VOLTAMMETRY STUDY OF SELF-ASSEMBLED LAYER ON SILVER

Self-assembled monolayer(SAM) of 3-mercaptopropyltrimethoxysilane(MPS) absorbed on the surface of silver was constructed and electrochemical characteristics and compact extent of the monolayer was studied by cyclic voltammetry(CV) and contact angle.The results indicated that SAM by MPS can be obtained and can inhibit electrons from transferring across the thin film according to the decrease of peak current,the negative-moving reductive peak potential and the increase of peak potential difference of CV on the modified electrode.MPS assembled concentration and assembled time can affect compact extent of the monolayer and the best efficacious MPS assembled concentration in ethanol was 0.1 mmol/L for 6 h.An analysis of contact angle of the monolayer showed that self-polymeric extent of the end-group in MPS can increase with the increase of hydrolysis time and the compact extent of the monolayer can be markedly improved by prolonging hydrolysis time.