Preparation Of Poly(Ionic Liquids)Functionalized PPy/Go And Its Electrocatalytic Property

Thin film with two-dimensional (2D) nanostructures has been considered as a kind of promising modified electrodematerial with good stability and excellent sensitivity for the application to build electrochemical sensors and biosensors, due to its good environmental stability, thinner thickness and large surface area.Recently, novel composite film materials composed of conducting polymers (CPs) and graphene oxide (GO) have attracted a tremendous amount of attentions and become a research focus, because they possess both excellent properties of conducting polymers and graphene oxide, such as high electric conductivity at room temperature, long term environmental stability, good electrochemical activity and biocompatibility of CPs, as well as unique electrical and chemical properties of G or GO. Therefore, CPs/GO nanocomposite materials can be applied in many fields such as energy storage, supercapacitors or electrochemical sensors and biosensors for the detection of certain special substances. However, CPs/GO nanocomposites were rarely used for electrochemical sensors and biosensors due to the hydrophobicity and poor dispersibility of the pristine CPs on the surface of electrode.The emergence of poly(ionic liquids) (PILs) provides a new method to solve these problems, for they combined the unique properties of ionic liquids (ILs) with the intrinsic polymer properties and presented the advantages of both ionic liquids and polymers. Therefore, PILs as a modifier may contribute more excellent performance to electrode materials for electrochemical sensors and biosensors.In this article, a series of novel imidazole PILs functionalized polypyrrole/graphene oxide (PPy/GO) nanocomposites were prepared and studied. Due to the synergistic effects of GO with well-defined lamellar structures, conductive PPy and biocompatible PILs, PILs/PPy/GO modified glassy carbon electrode (GCE) presented the excellent electrochemical catalytic activities, good stability, high sensitivity and wide linear range towards dopamine (DA) with the presence of ascorbic acid (AA) of high concentration or the very low concentration.The existence of PILs on the surface of PILs/PPy/GO nanosheets not only changed the surface charge property and dispersibility of PPy/GO, but also effectively improved the transmission mode of electrons. It is indicated that PILs/PPy/GO can act as a good steady and sensitive electrode material for the development of improved DA sensors.