钴酞菁与碳纳米管共修饰碳纤维织物传感器的制备及其电化学性能

为探索钴酞菁(CoPc)/碳纳米管(CNT)柔性葡萄糖传感器在葡萄糖检测中的应用,制备了一种CoPc和CNT共修饰的柔性碳纤维织物(CFT)修饰电极,并利用电化学工作站的银/氯化银参比电极和铂对电极与其共同组成三电极体系的葡萄糖传感器。借助扫描电子显微镜对修饰电极进行表征,采用循环伏安法、电化学阻抗图谱法、时间-电流曲线法研究葡萄糖传感器的电化学性能。结果表明:该修饰电极具有良好的导电性和电子转移能力,葡萄糖检测线性范围为4×10^-3~2.6 mmol/L,检测限为1.4 μmol/L (信噪比为3),灵敏度为231 μA·L/mmol;该修饰电极在检测葡萄糖时具有较好的重复性,测试10次后其响应电流仍可达到初始值的94.6%,且对果糖、蔗糖、乳糖、半乳糖、抗坏血酸、多巴胺、尿酸等物质具有较强的抗干扰性能。

Preparation and electrochemical properties of carbon fiber fabric sensors co-modified by cobalt phthalocyanine and carbon nanotubes

In order to explore the application of cobalt phthalocyanine(CoPc)/carbon nanotube(CNT)flexible glucose sensors for glucose detection,a flexible carbon fiber fabric(CFT)glucose sensor based on CoPc and CNT modification were prepared.The Ag/AgCl reference electrode and platinum counter electrode of electrochemical workstation were used to form the three-electrode glucose sensor.The modified electrode was characterized by scanning electron microscope,and the electrochemical properties of the glucose sensor was studied by cyclic voltammetry,electrochemical impedance spectroscopy and time-current curve.The results show that the modified electrode has good conductivity and fast electron transfer capability,and its linear range for glucose detection is found to be 4×10^-3-2.6 mmol/L,the detection limit can be as low as 1.4μmol/L(signal-noise ratio is 3),and the sensitivity is as high as 231μA·L/mmol.In addition,the modified electrode has good repeatability in detecting glucose,and the responsive current could still reach 94.6%of the initial value after ten cyclic measurements.It show strong anti-interference performance against fructose,sucrose,lactose,galactose,ascorbic acid,dopamine,uric acid and other substances.