Synthesis Of Chemical Vapor Deposition Graphene And Its Applications For Sensors And Supercapacitors

As a new type of two-dimensional of carbon nanomaterials, graphene not only has more excellent properties than ordinary materials on light, electricity, power, thermal, magnetic and other properties, but also has a larger surface area, to accelerate the electron transfer and the ability of adsorption organic matters. So graphene has great prospect and research value in ensors and capacitors. This paper studies the CVD graphene preparation method and its application in biosensors and supercapacitors. The main contents of this paper have been described as follows:1. Graphene/Ni composites prepared by DC arc plasma jet CVD method. Graphene/Ni composites have excellent electricalcatalytic ability, which is due to graphene’s synergistic effect accelerated electron transfer speed, enhanced catalytic activity of Ni. Modified glassy carbon electrode with graphene, build high-performance L-alanine biosensors. From the experimental and analysis, we find that L-phenylalanine sensor exhibited good electrocatalytic with detection limit of 0.1μM, a high sensitivity of 30.4μA(μMcm2)-1 and 118.0μA(μMcm2)-1.2. Graphene/Ta wire electrode prepared by electron assisted hot-filament chemical vapor deposition(EA-HFCVD). A Mg O nanobelt-modified electrode was thus fabricated for simultaneous determination of ascorbic acid(AA), dopamine(DA), uric acid(UA), Mg O and graphene synergies enhanced electron transfer and adsorption capacity of AA, DA and UA with detection limits of 0.03,0.15 and 0.12 μM, and has good stability and anti-jamming capability.3. Graphene/Ta wire electrodes were prepared by EA-HFCVD. Graphene/Ta wire electrode prepared with the highest capacitance of 345.5 F/g at 0.5A/g current density. The supercapacitor that graphene/Ta wire as the anode and cathode Pt wire as asymmetric can provide power supply for diode(1.7V drive voltage) about 90 s in 1M Na2SO4 aqueous electrolyte. In addition, the supercapacitor remains at about 84% after 1000 cycles at 10A/g. Graphene/Ta wire electrode has potential applications in high-performance energy storage devices.