Metal organic framework and the bamboo charcoal composite for sensitive and selective detection of dopamine

Abstract

The nanocomposite (BC@Cu-BTC) composed of copper-based organic skeleton (Cu-BTC) and bamboo charcoal (BC) was successfully fabricated. The large specific surface area of Cu-BTC (1245.25 m2/g) and the synergistic effect with BC are beneficial for enhancing the current signal used to detect dopamine in aqueous solution. Additionally, cyclic voltammetry studies have shown that diffusion regulates the kinetic process of dopamine on the surface of the BC@Cu-BTC electrode, which is confirmed by the Warburg impedance in the low frequency region. The results show that the sensor has a very low detection limit (1.572 μmol/L at S/N = 3) and a wide detection range (1 ∼ 100 μmol/L). Based on excellent selectivity, stability, repeatability and reproducibility, the analytical performance of dopamine detection is evaluated. Finally, when BC@Cu-BTC is used as the electrode material, dopamine is detected in the urine, and the results are satisfactory.

Keywords

• Electrochemical sensor
• Metal organic framework
• Bamboo charcoal
• Dopamine