A novel sandwich polyoxometalate (POM) Na₁₂[WCo₃(H₂O)₂(CoW₉O₃₄)₂] and poly(vinylimidazolium) cation [PVIM⁺] in combination with nitrogen-doped carbon nanotubes (NCNTs) was developed for a highly selective and ultrasensitive detection of dopamine. Conductively efficient heterogenization of Co₅POM catalyst by PVIM over NCNTs provides the synergy between PVIM–POM catalyst and NCNTs as a conductive support which enhances the electron transport at the electrode/electrolyte interface and eliminates the interference of ascorbic acid (AA) at physiological pH (7.4). The novel PVIM–Co₅POM/NCNT composite demonstrates a superior selectivity and sensitivity with a lowest detection limit of 500 pM (0.0005 μM) and a wide linear detection range of 0.0005–600 μM even in the presence of higher concentration of AA (500 μM).

中文翻译：

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聚（离子液体）-多金属氧酸钴/ CNT复合材料对多巴胺的超灵敏和高选择性电化学检测

开发了一种新型的夹心多金属氧酸盐（POM）Na ₁₂ [WCo ₃（H ₂ O）₂（CoW ₉ O ₃₄）₂ ]和聚（乙烯基咪唑鎓）阳离子[PVIM ⁺ ]以及掺氮碳纳米管（NCNTs），用于对多巴胺的高度选择性和超灵敏检测。通过PVIM在NCNT上对Co ₅ POM催化剂进行导电高效的异质化，可在PVIM–POM催化剂和NCNT之间作为导电载体提供协同作用，从而增强电极/电解质界面上的电子传输并消除抗坏血酸（AA）在生理pH值下的干扰（7.4）。新型PVIM–Co ₅POM / NCNT复合物具有优异的选择性和灵敏度，即使存在较高浓度的AA（500μM），其最低检测限为500 pM（0.0005μM），线性检测范围为0.0005–600μM。