In this study, silver/silver sulfide (Ag/Ag2S) was applied on an electrochemical system for the simultaneous determination of dopamine (DA) and ascorbic acid (AA) in phosphate buffer solution (pH 7.0). The Ag/Ag2S nanoparticles were dispersed with carbon nanotube (CNT) in Nafion to be an Ag/Ag2S-immobilized CNT electrode. The electrochemical behaviors of DA and AA were examined using the differential pulse voltammetry (DPV) technique. The characteristic peaks of DA and AA in the differential pulse votammogram were well separated. Without Ag/Ag2S, CNT electrode cannot detect AA. When Ag/Ag2S nanoparticles were immobilized on the CNT electrode, the sensitivity to DA increased from 0.637 to 1.000μAμM-1cm-2, and the sensitivity to AA became 0.020μAμM-1cm-2 in the linear concentration range of 250-2000μM.
|Number of pages||7|
|Journal||Journal of the Taiwan Institute of Chemical Engineers|
|Publication status||Published - 2014 May|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)