| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 601072 | Colloids and Surfaces B: Biointerfaces | 2011 | 5 Pages |
A simple, sensitive, and reliable method based on a multi-walled carbon nanotubes (MWNTs) modified carbon ionic liquid electrode (CILE) has been successfully developed for determination of dopamine (DA) in the presence of ascorbic acid (AA). The acid-treated MWNTs with carboxylic acid functional groups could promote the electron-transfer reaction of DA and inhibit the voltammetric response of AA. Due to the good performance of the ionic liquid, the electrochemical response of DA on the MWNTs/CILE was better than that of other MWNTs modified electrodes. Under the optimum conditions a linear calibration plot was obtained in the range 5.0 × 10−8 to 2.0 × 10−4 mol L−1 and the detection limit was 1.0 × 10−8 mol L−1.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► DA, AA and UA can be well separated at the CILE, and cannot interfere with each other. ► The acid-treated MWNTs are chosen for modifying the CILE. ► The modifier MWNTs offer improved voltammetric response and selectivity towards DA. ► Square-wave voltammetry is used for DA determination.
