One‐Step Electrochemical Synthesis of Graphene/Polyaniline Composite Film and Its Applications

Abstract

This work describes a new one-step large-scale electrochemical synthesis of graphene/polyaniline (PANI) composite fi lms using graphite oxide (GO) and aniline as the starting materials. The size of the fi lm could be controlled by the area of indium tin oxide (ITO). Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible absorption spectrum (UV-vis) results demonstrated that the graphene/PANI composite fi lm was successfully synthesized. The obtained graphene/PANI composite fi lm showed large specifi c area, high conductivity, good biocompatibility, and fast redox properties and had perfect layered and encapsulated structures. Electrochemical experiments indicated that the composite fi lm had high performances and could be widely used in applied electrochemical fi elds. As a model, horseradish peroxidase (HRP) was entrapped onto the fi lm-modified glassy carbon electrode (GCE) and used to construct a biosensor. The immobilized HRP showed a pair of well-defined redox peaks and high catalytic activity for the reduction of H 2 O 2 . Furthermore, the graphene/ PANI composite fi lm could be directly used as the supercapacitor electrode. The supercapacitor showed a high specifi c capacitance of 640 F g − 1 with a retention life of 90% after 1000 charge/discharge cycles.

Effective Room-Temperature Ammonia-Sensitive Composite Sensor Based on Graphene Nanoplates and PANI

“…18 For PANI sample, the peak shows at high wavelength 748 nm-760 nm, could be attributed to quinoid excitation and π-polaron transition. 19 A short peak at 328 nm could be attributed to the π-π * transition of the benzenoid ring. 17 These peaks are typical for doped PANI emeraldine salt.…”

Graphene/polymer composites for energy applications

“…80 However, this graphene paper was prepared by filtration, which would greatly suppress the specific surface of graphene. A modified synthesis method was proposed by Feng et al 97 In this case, the graphene/PANI composite was prepared using a GO suspension and aniline as the starting materials for electrodeposition; the resulting composite's specific capacitance was measured to be 640 F g À1 with a retention of 90% after 1000 charge/discharge cycles.…”

Flexible and Transparent Plastic Electrodes Composed of Reduced Graphene Oxide/Polyaniline Films for Supercapacitor Application

“…The N1s core-level spectra (Figure 3(d) and 3(e)) revealed three peaks in the deconvolution of the spectra, which were corresponded to different electronic states: The benzenoid amine with a binding energy (BE) centered at 398.9 eV, the quinoid amine with a BE at 397.5 eV, and the nitrogen cationic radical (N + ) with a BE at 401.0 eV. 13 The benzenoid amine (-NH-) content decreased from 62.3 to 46.3%, while the nitrogen quinoid amine (-N=) increased significantly from 7.1 to 27.0%. The cationic radical (N + ) content also decreased slightly from 30.5 to 26.6% (Table 1).…”

“…10 A large variety of composite materials including graphene and PANi has been developed for the supercapacitor application, i.e. graphene/PANi composite, 11 graphene/PANi nanofiber composite, 12 electrochemically polymerized PANi/ reduced graphene oxide (RGO) films, 13 PANi nanorods array on graphene oxide (GO) nanosheets, 14 graphene/PANi porous silica MCM-41, 15 and PANi-coated curved graphene active materials. 16 However, a challenging task still remains for development of flexible transparent lightweight supercapacitors with high power and energy density based on PANi/ RGO film electrodes on a plastic substrates including polyethylene terephthalate (PET).…”