本文采用电化学性能独特的联吡啶钌（Ru（bpy）32＋）、氮掺杂石墨烯（NG）和Nafion膜构建了一种新型的盐酸异丙嗪电化学传感器。采用红外光谱和扫描电子显微镜对氮掺杂石墨烯的形貌进行了表征。在Nafion膜中添加导电性好、比表面积大...本文采用电化学性能独特的联吡啶钌（Ru（bpy）32＋）、氮掺杂石墨烯（NG）和Nafion膜构建了一种新型的盐酸异丙嗪电化学传感器。采用红外光谱和扫描电子显微镜对氮掺杂石墨烯的形貌进行了表征。在Nafion膜中添加导电性好、比表面积大的氮掺杂石墨烯可以增加电子传递速度并且可以防止联吡啶钌扩散到Nafion膜的非电活性区域而增加电极使用寿命。在p H 7.0的磷酸盐缓冲溶液中,盐酸异丙嗪在Ru（bpy）32＋/NG/Nafion修饰电极上的循环伏安曲线表明,与单一的裸玻碳电极、Ru（bpy）32＋/Nafion修饰电极以及NG/Nafion修饰电极相比,该修饰电极使盐酸异丙嗪得氧化峰电流显著增加,而峰电位明显负移,表明采用Ru（bpy）32＋/NG/Nafion膜制备的复合修饰电极对盐酸异丙嗪呈现出较强的电化学催化作用。优化实验条件后,发现在1.0×10^-6mol·L^-1~1.0×10^-4mol·L^-1.浓度范围内,盐酸异丙嗪的氧化峰电流与其浓度呈良好的线性关系,检测限为3.6×10^-7mol·L^-1。而且该电极的重现性、稳定性和选择性良好,采用标准加入法可成功用于商业盐酸异丙嗪注射液中盐酸异丙嗪的测定。展开更多
A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electroc...A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electrocatalytic activity for the oxidation of L-cysteine. The currents(measured by different pulse voltammetric techniques) increase linearly with the increase of the concentration of L-cysteine in the range from 1×10 -6 to 2×10 -3 mol/L. The detection limit is 2×10 -7 mol/L. The modified electrode has the best properties of the two components of the system, such as the electrocatalytic properties of carbon nanotubes and the molecular recognition and accumulation abilities of α-cyclodextrin. The result demonstrates that it has a good stability and reproducibility and is available in the detection of L-cysteine in urine.展开更多
文摘本文采用电化学性能独特的联吡啶钌（Ru（bpy）32＋）、氮掺杂石墨烯（NG）和Nafion膜构建了一种新型的盐酸异丙嗪电化学传感器。采用红外光谱和扫描电子显微镜对氮掺杂石墨烯的形貌进行了表征。在Nafion膜中添加导电性好、比表面积大的氮掺杂石墨烯可以增加电子传递速度并且可以防止联吡啶钌扩散到Nafion膜的非电活性区域而增加电极使用寿命。在p H 7.0的磷酸盐缓冲溶液中,盐酸异丙嗪在Ru（bpy）32＋/NG/Nafion修饰电极上的循环伏安曲线表明,与单一的裸玻碳电极、Ru（bpy）32＋/Nafion修饰电极以及NG/Nafion修饰电极相比,该修饰电极使盐酸异丙嗪得氧化峰电流显著增加,而峰电位明显负移,表明采用Ru（bpy）32＋/NG/Nafion膜制备的复合修饰电极对盐酸异丙嗪呈现出较强的电化学催化作用。优化实验条件后,发现在1.0×10^-6mol·L^-1~1.0×10^-4mol·L^-1.浓度范围内,盐酸异丙嗪的氧化峰电流与其浓度呈良好的线性关系,检测限为3.6×10^-7mol·L^-1。而且该电极的重现性、稳定性和选择性良好,采用标准加入法可成功用于商业盐酸异丙嗪注射液中盐酸异丙嗪的测定。
文摘A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electrocatalytic activity for the oxidation of L-cysteine. The currents(measured by different pulse voltammetric techniques) increase linearly with the increase of the concentration of L-cysteine in the range from 1×10 -6 to 2×10 -3 mol/L. The detection limit is 2×10 -7 mol/L. The modified electrode has the best properties of the two components of the system, such as the electrocatalytic properties of carbon nanotubes and the molecular recognition and accumulation abilities of α-cyclodextrin. The result demonstrates that it has a good stability and reproducibility and is available in the detection of L-cysteine in urine.
