Cyclic voltammetry and electrical impedance spectroscopy of electrodes modified with PEDOT:PSS-reduced graphene oxide composite

• Main Authors: Ramli, Nurul Izzati, Ismail, Nur Alya Batrisya, Abd. Wahab, Mohd. Firdaus, Wan Salim, Wan Wardatul Amani
• Format: Book Chapter
• Language: English
• Published: Intech Open 2018
• Subjects: QD Chemistry; TA164 Bioengineering; TP155 Chemical engineering; TP248.13 Biotechnology
• Online Access: http://irep.iium.edu.my/68445/1/Cyclic%20Voltammetry%20and%20Electrical%20Impedance%20Spectroscopy%20of%20Electrodes%20Modified%20with%20PEDOTPSS-Reduced%20Graphene%20Oxide%20Composite%202018.pdf; http://irep.iium.edu.my/68445/; https://www.intechopen.com/online-first/cyclic-voltammetry-and-electrical-impedance-spectroscopy-of-electrodes-modified-with-pedot-pss-reduc
• Institution: Universiti Islam Antarabangsa Malaysia

Cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) are electrochemical techniques to characterize reversibility of electron transfer and impedance at the electrode-solution interface, respectively. Reduced graphene oxide (rGO) and conductive polymer PEDOT:PSS are often used to enhance electron transfer at electrode surface. This chapter provides a step-by-step methodology of CV and EIS conducted on screen-printed carbon electrode (SPCE) modified with rGO-PEDOT:PSS and brief discussion on the CV and EIS results. The CV of rGO-PEDOT:PSS shows a reversible electron transfer in comparison to SPCE modified with PEDOT:PSS. For EIS, rGO-PEDOT:PSS was found to reduce the Warburg impedance, suggesting enhanced electrode conductivity. These results suggest that rGO-PEDOT:PSS is a suitable material for biosensing purpose.