*Review* **A Review on Impedimetric and Voltammetric Analysis Based on Polypyrrole Conducting Polymers for Electrochemical Sensing Applications**

**Nurul Akmaliah Dzulkurnain 1, Marliyana Mokhtar 2, Jahwarhar Izuan Abdul Rashid <sup>1</sup> , Victor Feizal Knight 2, Wan Md Zin Wan Yunus 3, Keat Khim Ong 2, Noor Azilah Mohd Kasim <sup>2</sup> and Siti Aminah Mohd Noor 1,\***


**Abstract:** Conducting polymers have been widely used in electrochemical sensors as receptors of the sensing signal's analytes and transducers. Polypyrrole (PPy) conducting polymers are highlighted due to their good electrical conductive properties, ease in preparation, and flexibility of surface characteristics. The objective of this review paper is to discuss the theoretical background of the two main types of electrochemical detection: impedimetric and voltammetric analysis. It also reviews the application and results obtained from these two electrochemical detections when utilizing PPy as a based sensing material in electrochemical sensor. Finally, related aspects in electrochemical sensor construction using PPy will also be discussed. It is anticipated that this review will provide researchers, especially those without an electrochemical analysis background, with an easy-tounderstand summary of the concepts and technologies used in electrochemical sensor research, particularly those interested in utilizing PPy as a based sensing material.

**Keywords:** electrochemical sensor; biosensor; impedimetric; voltammetric; polypyrrole; conducting polymer
