Preparation And Study Of Electrochemical Properties Of Three-dimensional Carbon Membrane Nanocomposites

Nanotechnology has been a research focus of scientists for several years, andnanomaterials science is an important branch in the field of nanotechnology.Compared with general materials, nanomaterials show many specific physical andchemical properties, such as light, electric, acoustic, thermal, magnetic, mechanicsbecause of its quantum size effect, macroscopic tunnel effect and surface effect.Therefore, the preparation of various nanomaterials has been an important way todevelop new materials. What's more, due to its special properties, carbonnanomaterial is one of the most active research field in nanoscience and it plays ahuge role in promoting the rapid development of nanoscience. Among the field ofcarbon nanomaterial, three-dimensional carbon nanomaterial can immobilizenanoparticles effectively and maintain their catalytic activity. Because of its relativelylarge surface area, good electrical conductivity, excellent mechanical properties,optical performance and other characteristics, it has been widely used in scientificresearch. In this paper, we carry out the following three works, focusing on thepreparation and applications of three-dimensional carbon nanocomposite in the aspectof electrochemical work:1. We synthesized the three-dimensional composite of silver nanoparticlescatalysts supported on N-doped ordered mesoporous carbon (Ag NPs/N-OMC) withSBA-15as a template by one pot method. We characterized the morphology,composition, crystal form, surface chemical environment and pore size of thecomposite material through the technique of SEM, TEM, XRD, XPS, nitrogenadsorption desorption. We also used as-prepared three-dimensional composite tofabricate modified electrode (Ag NPs/N-OMC/GCE) and applied this modifiedelectrode to detect nitrobenzene (NB) by pulse voltammetry. The results show that thetesting line of6.61nM can be achieved.2. A novel composite (BLG/rGO) of graphene oxide(rGO)and ?-lactoglobulinBLG is synthesized, by using ?-lactoglobulin(BLG)functionalizes graphene oxide (GO) conductive substrate and reduces it chemically. The composite is hydrophilicand has mercapto groups on the surface. Then, Au nanoparticles (Au NPs) andporphyrin with four mercapto groups (TPP (SH)4) are assembled to the surface ofBLG/rGO material, resulting a three dimensional carbon nanomaterials (AuNPs/rGO/TPP(SH)4/Au NPs/rGO). Afterwards, we prepare the modified electrode(Au NPs/FeTPP(SH)4/rGO/GCE)by chelation activity between porphyrin containingMercaptos groups and Fe3+to form a three-dimensional organic-inorganic metal nano-frame structure using electrochemical scanning approach. The modified electrode isapplied to detect hydrogen peroxide and shows excellent performance.3. A three-dimensional composite with spatial orientation of Au nanoparticlesand graphene is assembled on the surface of glassy carbon electrode by self-assemblyapproach and forms Au NPs/dimethyl mercapto phenol (TDS)/reduced grapheneoxide, a three-dimensional nanocomposite modified electrode (Au NPs/TDS/rGO/GCE). In the preparation process, we use glassy carbon electrode as workingelectrode, the composite (Au NPs/rGO) of Au nanoparticles and graphene as asubstrate, and TDS is used to stabilize Au NPs and crosslinked with graphene. Finally,the prepared modified electrode is alpplied to detect o-nitrophenol and showsexcellent performance.