Dopamine sensor based on a boron-doped diamond electrode modified with a polyaniline/Au nanocomposites in the presence of ascorbic acid.
A selective dopamine (DA) sensor was developed using gold nanoparticles (Au-NPs) dispersed overoxidized-polyaniline (PANI(ox)) based on a boron-doped diamond (BDD) thin-film electrode. The concentration of the DA was determined using voltammetry as a non-enzymatic sensor. BDD thin film has a high signal-to-noise ratio, a long-term stability, a high sensitivity, and a good reproducibility. PANI nanocomposites were directly synthesized on the BDD electrode and overoxidized using 0.5 M H(2)SO(4) solution. The overoxidized PANI film enhances selectivity and sensitivity toward DA. The Au-NPs were dispersed on the PANI nanocomposite by electrochemical deposition. The nanometer-sized Au-NPs favor the sensing of DA in the presence of ascorbic acid (AA). The combination of the PANI with the Au-NPs and the BDD electrode can create synergetic effects for the performance of the biosensor, such as a fast response time, a lower detection limit, a wider linear range, enhanced selectivity, and higher sensitivity for the determination of DA.
Department of Materials Science and Engineering, Korea University, Seoul, Korea.
Min-Jung
MJ
Song
Seung-Koo
SK
Lee
Jong-Hoon
JH
Kim
Dae-Soon
DS
Lim
D000814:Aniline Compounds / Q000737:chemistry*; D001205:Ascorbic Acid / Q000737:chemistry*; D001895:Boron / Q000737:chemistry*; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D008567:Membranes, Artificial; D053761:Nanocomposites / Q000737:chemistry*
D000814:Aniline Compounds; D008567:Membranes, Artificial; C416807:polyaniline; D006046:Gold; D001895:Boron; D001205:Ascorbic Acid; D004298:Dopamine