Multilayered Chemically Modified Electrode Based on Carbon Nanotubes Conglutinated by Polydopamine: A New Strategy for the Electrochemical Signal Enhancement for the Determination of Catechol

Abstract

A new strategy was developed for the construction of a multilayered chemical modified electrode. The electrode was modified with two layers of carbon nanotubes conglutinated by polydopamine embedded with β-cyclodextrin. The practicability of the designed electrode was validated by the determination of catechol as a model molecule. Using the multilayered electrode, the redox peak currents in cyclic voltammetry for catechol were enhanced significantly compared with an electrode modified with single-layer carbon nanotubes. With the amount of added β-cyclodextrin and pH optimized, the peak currents showed good linear relationship with concentrations of catechol in the range from 2.50 × 10⁻⁷ to 4.00 × 10⁻³mol·L⁻¹ with a detection limit of 4.00 × 10⁻⁸mol·L⁻¹ based on a signal-to-noise ratio equal to three. The recovery values for spiked tap water and lake water were also satisfactory.

Keywords:

• Carbon nanotubes
• β-cyclodextrin
• Catechol
• Cyclic voltammetry
• Multilayered electrode
• Polydopamine

Additional information

Funding

The authors gratefully acknowledge the financial support by the Fundamental Research Funds for the Central Universities (No. 2018NQN45).