Preparation Of Pani-graphene Composites And The Characterization Of Their Properties

Polyaniline is a kind of conductive polymer which is excellent for its electrical conductivity, thermal conductivity, electrical storage capacity, electrochemical activity and optoelectronic properties, etc. Its insoluble, refractory properties and poor stability in charge-discharge processes make its applications impeded. The high strength and modulus, excellent thermal conductivity and carrier mobility, large specific surface of graphene make it widely used in digital products, chemical and biological sensors, electronic storage devices and reinforcing the electrical conductivity of rubber materials.In this paper, a low-temperature in-situ polymerization of aniline was used to prepare PANI-G, PANI-Tr G and PANI-RGO composite films. FTIR, XRD, Raman, SEM and XPS spectrometer were used to detect and analyze their structures and micro- morphologies.The electrochemical properties of PANI-G, PANI-Tr G and PANI-RGO films were detected. When the mass ratio of graphite and aniline is 3%, the resulting PANI-G 3% has the maximum specific capacitance of 681.25 F/g with a current density of 1 A/g which is higher than pure polyaniline.When the mass ratio of Tr G and aniline is 3%, optimizing the in-situ polymerization conditions, the specific capacitance of the PANI-Tr G 7%* can reach as high as 1099 F/g at a scan rate of 5 mV/s. The Rct value of PANI-TrG 7%* is almost 2Ω. The PANI-Tr G 7%* subsequently exhibits excellent supercapacitor performance with an enhanced specific capacitance, good stability and a simple synthesis process.The conductivity of single-layer and multi-layer PANI-RGO composite films were measured by four-point probe method and it was found that with the increasing of polymerization time, the conductivity of composite films were increased.The conductivity of PANI-RGO film can reach to 61 S/cm with the polymerization time of 4 hours. With the increasing of composites’ layers, the conductivity of multi-layer PANI-RGO composite films were decreased.The specific capacitance of(PANI-RGO)4 multilayer film reached as high as 0.0458 F/cm2 at a scan rate of 5 m V/s.In this paper, a low-temperature in-situ polymerization of aniline was used to prepare PANI-G, PANI-Tr G and PANI-RGO film. The production process is simple but with high productivity, and the composition of PANI and these carbon materials not only solved the problem of polyaniline’s insoluble, but also improved the specific capacitance and stability of PANI. These materials will have broad application prospects in the field of flexible capacitors and supercapacitor electrode materials.