The selectivity of triethylene glycol modified glassy carbon electrode for charged and uncharged pieces

A triethylene glycol modified glassy carbon electrode (TEG–GCE) was fabricated by a controlled-potential electrolysis procedure. The performance of the film on the modified electrode surface was investigated by cyclic voltammetry with different probes. It was firstly found that while neutral pieces could penetrate the TEG film on the GCE surface, the ionic pieces, whatever it is anion or cation, was blocked by the film. This property was successfully used for determining dopamine (DA) in the presence of ascorbic acid (AA) with differential pulse voltammetry (DPV).

Graphical abstractThe ionic piece, whatever it is anion or cation, was well blocked by the TEG film on GCE surface while neutral piece could penetrate the film.Figure optionsDownload full-size imageDownload as PowerPoint slide