Electrochemical detection of dopamine via assisted ion transfer at nanopipet electrode using cyclic voltammetry

Michelle L. Colombo, Swami McNeil, Nicholas Iwai, Albert Chang, Mei Shen

Research output: Contribution to journalArticle

Abstract

We present here the detection of dopamine (DA) at nanopipet electrodes with radii of hundreds of nanometers ranging from 160 nm to 480 nm. Dibenzo-18-crown-6 (DB18C6) was employed as an ionophore to facilitate DA transfer, resulting in a half-wave transfer potential, E1/2, DA, of -0.322 (±0.020) V vs. E1/2, TBA. Well-defined steady-state sigmoidal cyclic voltammograms were observed for the transfer of DA. High resolution scanning electron microscopy was used to measure the size and taper angle of the nanopipet electrodes. The detection is linear with concentration of DA ranging from 0.25 mM to 2 mM; calculated diffusion coefficient at nanopipet electrodes with above mentioned sizes is 4.87 (±0.28) × 10-10 m2/s. The effect of the common interferent ascorbic acid on DA detection with nanopipet electrodes was evaluated, where DA detection still shows linear behavior with well-defined sigmoidal CVs with E1/2, DA being -0.328 (±0.029) V vs. E1/2, TBA. The diffusion coefficient for DA transfer in MgCl2 with the presence of 2 mM AA was measured to be 1.93 (±0.59) × 10-10 m2/s on nanoelectrodes with radii from 161 nm to 263 nm, but the physiological concentration of 0.1 mM AA had no effect on DA's diffusion coefficient.

Original languageEnglish (US)
Pages (from-to)H3072-H3076
JournalJournal of the Electrochemical Society
Volume163
Issue number4
DOIs
StatePublished - Jan 1 2016

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dopamine
Cyclic voltammetry
Dopamine
Ions
Electrodes
electrodes
ions
diffusion coefficient
Ionophores
Magnesium Chloride
radii
ascorbic acid
High resolution electron microscopy
Ascorbic acid
tapering
Ascorbic Acid
Scanning electron microscopy
scanning electron microscopy
high resolution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Electrochemical detection of dopamine via assisted ion transfer at nanopipet electrode using cyclic voltammetry. / Colombo, Michelle L.; McNeil, Swami; Iwai, Nicholas; Chang, Albert; Shen, Mei.

In: Journal of the Electrochemical Society, Vol. 163, No. 4, 01.01.2016, p. H3072-H3076.

Research output: Contribution to journalArticle

Colombo, Michelle L. ; McNeil, Swami ; Iwai, Nicholas ; Chang, Albert ; Shen, Mei. / Electrochemical detection of dopamine via assisted ion transfer at nanopipet electrode using cyclic voltammetry. In: Journal of the Electrochemical Society. 2016 ; Vol. 163, No. 4. pp. H3072-H3076.
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