Dopamine Sensor Based on a Boron-Doped Diamond Electrode Modified with a Polyaniline/Au Nanocomposites in the Presence of Ascorbic Acid
- Authors
- Song, Min-Jung; Lee, Seung-Koo; Kim, Jong-Hoon; Lim, Dae-Soon
- Issue Date
- Jun-2012
- Publisher
- JAPAN SOC ANALYTICAL CHEMISTRY
- Citation
- ANALYTICAL SCIENCES, v.28, no.6, pp.583 - 587
- Indexed
- SCIE
SCOPUS
- Journal Title
- ANALYTICAL SCIENCES
- Volume
- 28
- Number
- 6
- Start Page
- 583
- End Page
- 587
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/108307
- DOI
- 10.2116/analsci.28.583
- ISSN
- 0910-6340
- Abstract
- 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. PANE nanocomposites were directly synthesized on the BDD electrode and overoxidized using 0.5 M H2SO4 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.
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