Search

Abstract: A novel architecture was designed by controllable electrodeposition of silver nanoparticles doped chitosan hydrogel film for electrochemical sensing of trichloroacetic acid. The as prepared hydrogel film presents excellent ability to facilitate the diffusion and electron transfer process of the negatively charged redox couple [Fe(CN)6]3−/[Fe(CN)6]4− benefitting from positively charged chitosan in acidic solutions. Based on this, by combining the excellent electrocatalytic properties toward trichloroacetic acid, a sensitive amperometric sensor for trichloroacetic acid is constructed with a low detection limit. [Copyright &y& Elsevier]

Abstract: Silver nanoparticle coated multi-walled carbon nanotubes (Ag/MWCNT) were prepared and used to fabricate a modified electrode. The Ag/MWCNT composites were observed by a transmission electron microscope (TEM), and the electrochemical properties of the Ag/MWCNT composite modified glassy carbon electrode were characterized by electrochemical measurements. The results showed that these composites had a favorable catalytic ability for the reduction of trichloroacetic acid (TCAA). Square wave voltammetric (SWV) technique was applied to detect TCAA. Under optimum conditions, the voltammetric determination of TCAA was performed with a linear range of 5.0×10−6–1.2×10−4 mol L−1 and a detection limit of 1.9×10−6 mol L−1 (S/N=3). [ABSTRACT FROM AUTHOR]