Conductive Polymer On The Electrode Surface Modification

Preparation and electrochemical behavior were studied of conducting polypyrrole (PPy) chemically modified electrodes doped with common dopants and three important biomaterials, ATP, dopamine hydrochloride (DA) and L-glutamic acid sodium (Glu-Na).PPy films were obtained by potentiostatic electrochemical polymerization under the same conditions, with toluene-4-sulfonic acid, p-toluene sulfonic acid sodium salt, S-sulfosalicylic acid, sodium subsalicylate, lithium perchlorate, potassium bisulfate and sodium sulfate as the supporting electrolytes, respectively. Also, their electrochemical properties were studied. Different biomaterials have different doping methods. As to ATP, doping and dedoping indirect method was adopted. As to DA, overoxidation and a novel method according to charge-balance theory were used. Chronocoulometry was employed with regard to Glu-Na. FTIR spectrum, UV-VIS and CV curves were employed to indentify the doping of biomaterials into conducting PPy films. In addition, the stability of PPy/ATP and PPy/DA chemically modified electrodes in the sodium chloride injection were tested by CV and EIS curves and it demonstrated that, the modified electrodes were stable.