Preparation Of PANI/Au Electrochemical Modified Nanomaterials And Their Applications

Polyaniline (PANI), a common conducting polymer, was considered one of the mostpromising nanomaterials due to unique properties, including superior electronic properties, lowcost, excellent environmental stability, and high reactivity through oxidation and protonationreactions. In this work, two novel and simple methods were introduced to obtain PANInanotubes/Au hybrid nanostructures and carbon nanofibers/PANI nanofibers/AuNPsnanostructures (CPANFs). Transmission electron microscopy (TEM), field emission scanningelectron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy and X-raydiffraction (XRD) were employed to study the morphologies and structures of the materials.Moreover, the morphologies of the novel structures have been optimized by control the size andconcentration of AuNPs. Finally, the GCE nanoelectrodes were modified by the fabricatednanostructures to form novel nanoelectrodes, and the application at the detection for trace H2O2was explored.In fabrication of PANI nanotubes/Au hybrid nanostructures, the polyacrylonitrile fiber (PAN)and ammonium persulfateas (APS) were employed as the template and initiator, respectively.The triangle PANI nanofibers were loaded onto the surface of PAN nanofibers through in situpolymerization and then PANI nanotubes were obtained through the dissolution by N,N-dimethyl acetamide (DMAc) under room temperature. AuNPs were introduced onto thesurface of PANI nanotubes through oxidation/reduction reaction and cheating effect. In this work,Hollow PANI nanotubes/Au nanostructure with well-dispersed and tunable densities of AuNPswas fabricated. The resulting structures facilitate ion diffusion and are able to more efficientlydetect the electron signals. Electrochemical experiment was conducted and the novel structuresexhibit highly sensitive for the detection of H2O2.In this work, CNFs were successfully obtained from the electrospun PAN nanofibers througha carbonization process. PANI nanorods were then doped with perchloric acid (HClO4) andwrapped onto the surface of CNFs under nitrogen. And then well-dispersed AuNPs wereintroduced onto the surface of PANI nanorods through reduction reactions and cheating effect. Inthis work, the CPANFs nanostructure was obtained. Combined the excellentelectrical/mechanical properties of CNFs, PANI and AuNPs together, the fabricatedelectrochemical detectors for H2O2exhibited high sensitivity for detection of H2O2(3-504μM)with a detection of0.18μM at signal-to-noise ratio of3.Polyaniline (PANI)/Au hybrid nanostructure was synthesized by a simple two-step process without any other templates or additives. TEM, FE-SEM, FTIR and XRD were employed tostudy the morphologies and structures of the hybrid. Results indicate that the AuNPs are evenlyimmobilized on the PANI nanofibers. Notably, the PANI/Au nanostructure exhibits extremelyhigh catalytic activity towards the organic dyes,4-nitro phenol (4-NP) and methylene blue (MB),which are attributed to stimulation effects of the AuNPs on the electrons transmission of NaBH4to4-NP or MB.