中空介孔碳球修饰的丝网印刷碳电极用于尼古丁的电化学检测

摘要

将一步法合成的中空介孔碳球(HMCS)修饰在丝网印刷碳电极(SPCE)上,得到了用于尼古丁电化学检测的新型电极(HMCS/SPCE).通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、粉末X射线衍射(XRD)、X射线光电子能谱(XPS)以及拉曼光谱等方法对HMCS及修饰电极HMCS/SPCE进行表征.由于HMCS具有较大的电化学活性面积和良好的导电性,修饰电极HMCS/SPCE对尼古丁表现出良好的电催化活性.在优化实验条件下,电极HMCS/SPCE对尼古丁的检测线性范围为0～ 500 μmol/L,灵敏度为0.850 mA/(cm2· mmol·L-1),检出限为0.058 μmol/L.制备的传感器具有重复性好、稳定性高等特点,可用于实际烟草样品中尼古丁的检测.%A novel modified electrode(HMCS/SPCE) was developed to electrochemically detect nicotine based on screen-printed carbon electrodes (SPCE) modified with hollow mesoporous carbon spheres(HMCS) synthesized through one step process.HMCS and HMCS/SPCE were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and Raman spectrometry.Due to the superior electrical conductivity and high electrochemical active sites of HMCS,nicotine was significantly electro-oxidized on the interface of HMCS/SPCE.The proposed sensor provided linear responses upon nicotine in the concentration range of 0-500 μmol/L.The sensitivity was 0.850 mA/(cm2 · mmol · L),and the limit of detection was calculated to be 0.058 μmol/L.With a favourable reproducibility and a good stability,the sensor could be used to detect nicotine in cigarette samples accurately.