▎ 摘　　要

NOVELTY - Method for detecting dopamine on acidified graphene nanotube/short multi-wall carbon nanotube modified electrode, comprises (i) dispersing multi-walled carbon nanotubes in mixed concentrated acid, performing ultrasonic treatment in hot water bath, immediately cooling, centrifuging, washing and drying to obtain short multi-walled carbon nanotubes, (ii) dispersing graphene nanotubes in mixed concentrated acid, performing reflux heating, immediately cooling with ice water, separating, then washing and drying to obtain acidified graphene nanotubes, (iii) dispersing certain amount of short multi-walled carbon nanotubes and acidified graphene nanotubes in a suitable solvent respectively, ultrasonically mixing, stirring uniformly to obtain a mixed solution after cooling, taking certain amount of mixed solution to modify glassy carbon electrode and drying to obtain acidified graphene nanotube/short multi-wall carbon nanotube modified electrode, and (iv) recording volt-ampere response signal. USE - The method is useful for detecting dopamine on acidified graphene nanotube/short multi-wall carbon nanotube modified electrode. ADVANTAGE - The method improves the selectivity of the sensor interface to dopamine. DETAILED DESCRIPTION - Method for detecting dopamine on acidified graphene nanotube/short multi-wall carbon nanotube modified electrode, comprises (i) dispersing multi-walled carbon nanotubes in mixed concentrated acid, performing ultrasonic treatment in a hot water bath, immediately cooling, centrifuging, washing and drying to obtain short multi-walled carbon nanotubes, (ii) dispersing graphene nanotubes in mixed concentrated acid, performing reflux heating, immediately cooling with ice water, separating, then washing and drying to obtain acidified graphene nanotubes, (iii) dispersing certain amount of short multi-walled carbon nanotubes and acidified graphene nanotubes in a suitable solvent respectively, ultrasonically mixing the dispersed short multi-walled carbon nanotubes and dispersed acidified graphene nanotubes, stirring uniformly to obtain a mixed solution after cooling, taking certain amount of mixed solution to modify the glassy carbon electrode and drying to obtain acidified graphene nanotube/short multi-wall carbon nanotube modified electrode, and (iv) utilizing conventional three-electrode system in different concentrations of dopamine standard solutions, taking glassy carbon electrode modified with graphene nanotubes/short multi-wall carbon nanotubes as a working electrode, platinum wire as a counter electrode, and saturated calomel electrode as a reference electrode, enriching for certain period of time, recording the volt-ampere response signal, drawing a current-concentration standard curve, and comparing the sample response signal with the standard curve when testing samples to obtain dopamine concentration of the corresponding sample.