A Study of Copper(II) Hexacyanoferrate-PEDOT Films and Their Sensitivity for Ascorbic Acid and Acetaminophen

The conducting polymer (PEDOT) modified electrode was used to investigate the formation of copper(II) hexacyanoferrate by adjusting molar ratio of ferricyanide and copper(II) chloride with 20 scan cycles of 0 – 1 V. Three film types of copper(II) hexacyanoferrate/PEDOT have been successfully prepared and discussed using PEDOT film modified electrodes in [K3Fe(CN)6]:[CuCl2] = 1:1, 1:5, and 1:10, respectively. The copper(II) hexacyanoferrate/PEDOT films exhibit significant voltammograms and can be classified from Type I to Type III due to their different CuHCF content. All of these films exhibit specific fiber-like structure due to the doping of ferricyanide and copper(II) hexacyanoferrate on PEDOT surface. Furthermore, these films could simultaneously determine AA and AP. Particularly, the film with higher CuHCF content could provide much higher sensitivity. The current response can be expressed as Ipa1(μA) = 25.93[AA](mM) + 147.2 (R2 = 0.9946) and Ipa2(μA) = 19.79[AP](mM) + 189.6 (R2 = 0.9972). The linear range is found in 0.18–1.8x10−2 M and 0.16–1.6x10−2 M for AA and AP, respectively.