A microporous silk carbon-ionic liquid composite for the electrochemical sensing of dopamine
A microporous silk carbon-ionic liquid composite for the electrochemical sensing of dopamine
复制标题
用于多巴胺电化学传感的微孔丝碳-离子液体复合材料
作者：
Wang Min;Bai Lu;Zhang Lingling;Sun Guangping;Zhang Xiaowei;Dong Shaojun
以天然蚕茧为原料，经炭化、KOH活化后制得多孔丝炭（Silk C）。所制备的Silk C具有大表面积（SBET：2854.53 m2 g-1）和高孔隙体积（1.54 cm 3 g-1）、均匀微孔（2.5 nm）和多个缺陷的良好特性。在研磨条件下，离子液体通过非共价（π-π）相互作用修饰Silk C，制备了无金属的Silk C-离子液体（Silk C-IL）复合物，用于多巴胺（DA）的电化学测定。DA的检出限为79 nM（S/N = 3），线性范围为0.6 μM ~ 140 μM。同时，所制备的Silk C-IL/GCE对DA的检测具有良好的选择性，不受抗坏血酸、葡萄糖和尿酸等干扰。此外，Silk C-IL/GCE还成功地用于检测胎牛血清和盐酸多巴胺注射液样品中的DA。
Porous silk carbon (Silk C) was obtained through carbonization and KOH activation of natural silk cocoons. The as-prepared Silk C presented the good characteristics of a large surface area (SBET: 2854.53 m2 g−1) and a high volume of pores (1.54 cm3 g−1) with uniform micropores (2.5 nm) and multiple defects. The metal-free silk carbon–ionic liquid (Silk C–IL) composite, synthesized by modifying Silk C with ionic liquid through non-covalent (π–π) interactions under grinding conditions, was prepared for electrochemical determination of dopamine (DA). The detection limit of DA was 79 nM (S/N = 3) with a linear range from 0.6 μM to 140 μM. Meanwhile, the as-made Silk C–IL/GCE presented good selectivity for DA detection from other possible interferences, such as ascorbic acid, glucose and uric acid. Furthermore, the Silk C–IL/GCE was also successfully used for the detection of DA in fetal bovine serum and dopamine hydrochloride injection samples.