基于碳纳米笼直接修饰电极的多巴胺电化学传感器

采用模板法制备了直径约100 nm的碳纳米笼(CNCs),透射电镜表征表明制备的CNCs呈空心笼状结构.利用滴涂法将CNCs直接修饰在玻碳电极(GCE)表面,构建了多巴胺电化学传感器(CNCs/GCE).研究表明,CNCs/GCE对多巴胺的电化学氧化具有良好的催化性.最优实验条件下,CNCs/GCE对多巴胺检测的线性范围是8×10~(-8)~2×10~(-4)mol/L,检出限为6×10~(-9)mol/L(S/N=3).结果表明,该多巴胺电化学传感器具有良好的稳定性、重现性和选择性,用于实际样品多巴胺注射液中多巴胺含量的测定,结果令人满意.

A novel dopamine electrochemical sensor with CNCs directly modified on the glassy carbon electrode

Carbon nanocages( CNCs) with a diameter of about 100 nm are synthesized by the template method.Characterization of transmission electron microscopy shows that the obtained CNCs display a hollow cage structure.A novel dopamine electrochemical sensor is constructed with CNCs directly modified on the glassy carbon electrode( CNCs/GCE) by using a simple drop-coating method. The results show that CNCs/GCE displays excellent catalysis to the electrochemical oxidation of dopamine. Under optimum conditions,the peak current of CNCs/GCE is linear with the concentration of dopamine in the range of 8 × 10~(-8)~ 2 × 10~(-4) mol/L,with a detection limit of 6 ×10~(-9) mol/L( S/N = 3). The results show that the proposed electrochemical sensor exhibits good stability,reproducibility and selectivity. The sensor is successfully applied to the detection of dopamine in real injection samples,with satisfactory results.