Carboxyl-functionalized graphene oxide–polyaniline composite as a promising supercapacitor material

Application of GO in Energy Conversion and Storage

“…The composite used in SC shows maximum initial specific capacitances of 746 F g −1 . Unlike the use of the edged carboxyl groups of graphene sheets as linkers, to fully use the ample oxygen-containing groups on the basal plane of graphene sheets, Liu et al [195] performed oxalic acid treatment to achieve the carboxyl-functionalized GO (CFGO) for combining the amine-nitrogens. The CFGO/PANI composite delivers a specific capacitance of 525 F g −1 , twice of the reduced CFG-PANI (262 F g −1 ) at a current density of 0.3 A g −1 .…”

“…However, the relatively poor cycling life limits its practical applications. GO with high surface area and oxygen-containing groups has excellent capability to highly disperse the PANi and thus form stable hybrid composite for SC electrodes [192][193][194][195]. The hierarchical nanocomposites of PANI/GO, in which the PANI nanowire arrays are aligned vertically on GO substrate, show a remarkable synergistic effect of improving the specific capacitance to 555 F g −1 (298 F g −1 for PANI only) at a discharge current density of 0.2 A g −1 and retaining the capacitance to 92 % (74 % for PANI only) after 2,000 charge-discharge cycles [193].…”

Label-free human chorionic gonadotropin detection at picogram levels using oriented antibodies bound to graphene screen-printed electrodes

“…The sp 3 peak of graphene becomes more intense and broad aer PANI deposition. 36 This broadening of the sp 3 peak gives a signicant increase in the intensity ratio of D/G bands. Compared with graphene, the sp 3 peak of PANI showed a slight shi to higher frequencies, probably due to the electrostatic interaction between aniline monomers and graphene-SPE, both displaying aromatic features.…”

“…Fourier transform infrared spectroscopy (FTIR) measurements were performed using a Thermo Scientic Smart iTR Nicolet electrochemical applications, PANI was selected because of its simple synthesis and good stability. 35 The requirement for graphene oxidation prior to electropolymerization of aniline was investigated 36 and no signicant differences were observed between standard and oxidised PANI/graphene-SPE.…”

Amperometric urea biosensors based on sulfonated graphene/polyaniline nanocomposite

“…41 Several additional peaks were observed for SG-PANI ( Figure 6B) such as the peak at 1,266 cm -1 due to the C-H bending vibration of the benzoid ring, at 1,174 cm -1 corresponding to the C-H bending of the quinoid ring, and the peaks at 1,041 and 1,000 cm -1 corresponding to C-H bending of the quinoid ring and to the C-N + stretching of the bipolaron and polaron structure of PANI, respectively. [41][42][43] The appearance of such peaks indicates the formation of an emeraldine salt-type structure of PANI on SG. The spectrum of the SG-PANI composite included bands corresponding to both individual components in good agreement with the FTIR results.…”