Synthesis And Characteristics Of Poly (Sodium 4-styrensulfonate)-grafted Grapheme And Its Nanocomposite With Polyaniline

Graphene has attracted a great deal of attention owing to its exceptional chemical, electrical, mechanical and thermal properties since it was first reported in 2004. However, its chemical inert limits its application in many aspects. So it is very important to solve the problem of the modification of graphene.Poly(sodium 4-styrensulfonate) is grafted to grapheme oxide via in situ polymerization, and grapheme which has stable dispersed in water is obtained after the reduction by hydrazine hydrate. In our study, we control the length of the chain by changing the initiator amount in order to change the grafting ratio. With the increase of initiator amount, the grafting ratio decreases. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) are used to analysis morphology of G-g-PSSNa; UV-vis is used to study the dispersion of G-g-PSSNa in water; IR spectra,X-Ray photoelectron spectroscopy (XPS) and Ramam spectra are used to determine the functional groups and elements, which have proved grafting reaction successfully; XPS and thermogravimetric analysis (TGA) are used to estimate the grafting ratio.Aniline is polymerized and deposited in the surface of G-g-PSSNa via chemical oxidative polymerization after acidification of G-g-PSSNa, and then G-g-PSSNa/PANI is obtained. SEM and TEM are used to observe the deposition of polyaniline on the surface of G-g-PSSNa. The electrochemical properties is studied with cyclic voltammetry and capacity reaches 214 F·g^-1.