Abstract:
A no v e l s a n d w i c h polyoxometa l a te (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).
