voltammetric determination of dopamine using au nanoparticles decorated on multi-walled carbon nanotubes and β-cyclodextrin modified glassy carbon electrode

In the present study, a glassy carbon electrode (gce) was modified with a nanocomposite of multi-walled carbon nanotubes (mwcnts) and β -cyclodextrin (cd) and then decorated with gold nanoparticles to achieve the aunps- mwcnts@β-cd/gce electrode. the aunps- mwcnts@β-cd/gce electrode was distinguished via field emission scanning electron microscopy (fe- sem) and cyclic voltammetry (cv). on the one hand, interaction between mwcnts and β-cd increased electro-active surface area. on the other hand, decorating aunps on mwcnts@β-cd caused excellent electrical conductivity modified electrode. further, the synergistic effect between mwcnts@β-cd and aunps notably increments dp oxidation. differential pulse voltammetry (dpv) was utilized as a method to determine the amount of dopamine (dp). using the aunps-mwcnts@β-cd/gce electrode led to a 26-fold increase in the dp current response compared to the untreated electrode. under the optimized situation, the prepared sensor exhibited good sensitivity for detection dp in two linear ranges of 3.0–26.0 and 32.0–270.0 μm, with a detection limit of 0.85 μm.