Harbin Institute of Technology, Harbin, 150001, China.
Harbin Institute of Technology, Harbin, 150001, China.
Anal Chim Acta. 2017 Jul 4;975:61-69. doi: 10.1016/j.aca.2017.04.021. Epub 2017 Apr 26.
A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@CNT/MoS) modified glass carbon electrode (GCE) was fabricated with a adhesive of Nafion suspension and used as chemical sensors for sulfide detection. Single-layered MoS was coated on CNTs through magnetic traction force between paramagnetic monolayer MoS and Co particles in CNTs. Co particles faciliated the collection of paramagnetic monolayer MoS exfoliated from bulk MoS in solution. Amperometric analysis, cycle voltammetry, cathodic stripping analysis and linear sweep voltammetry results showed the Co@CNT/MoS modified GCE exhibited excellent electrochemical activity to sulfide in buffer solutions, but amperometric analysis was found to be more sensitive than the other methods. The amperometric response result indicated the Co@CNT/MoS-modified GCE electrode was an excellent electrochemical sensor for detecting S with a detection limit of 7.6 nM and sensitivity of 0.23 mA/μM. The proposed electrode was used for the determination of sulfide levels in hydrogen sulfide-pretreated fruits, and the method was also verified with recovery studies.
一种新型的混合金属钴内置于多壁碳纳米管/二硫化钼（Co@CNT/MoS）修饰的玻碳电极（GCE），使用 Nafion 悬浮液作为粘合剂制备，用作硫化物检测的化学传感器。单层 MoS 通过 CNT 中顺磁单层 MoS 和 Co 颗粒之间的磁力牵引作用涂覆在 CNT 上。Co 颗粒促进了从大块 MoS 中在溶液中剥落的顺磁单层 MoS 的收集。安培分析、循环伏安法、阴极剥离分析和线性扫描伏安法结果表明，Co@CNT/MoS 修饰的 GCE 在缓冲溶液中对硫化物表现出优异的电化学活性，但安培分析比其他方法更灵敏。安培响应结果表明，Co@CNT/MoS 修饰的 GCE 电极是一种用于检测 S 的优异电化学传感器，检测限为 7.6 nM，灵敏度为 0.23 mA/μM。该电极用于预处理过的水果中硫化物水平的测定，并通过回收研究进行了验证。
