Research On The Preparation Of Graphene/carbon Nanotube Composite Microbeads

Based on its unique structures and outstanding physicochemical properties,three-dimensional(3D)stacked structures of graphene and carbon nanotubes,such as foams,sponges,aerogels and spherical architectures have been favored by researchers,especially for the most interesting spherical architectures.Presently,the approach for preparation involves emulsion process,template,self-assembly and microfluidic technology etc.Here,homemade microfluidic and emulsion device were used to prepare carbon nanotube beads and a series of graphene/carbon nanotube composite beads,in which graphene oxide(GO)and acid-oxidized carbon nanotube(aMWCNTs)served as raw materials.Polyvinylpyrrolidone(PVP),polystyrene(PS)microspheres and Fe3O4 nanoparticles were used as binder,hard templates and functional materials,respectively.Meanwhile,we have studied their potential value in supercapacitor and water treatment.The detail works were summarized as the follows:1.A homemade droplet-based microfluidic device was designed to fabricate carbon nanotube beads and graphene/carbon nanotube core-shell,porous and magnetic porous beads.In the preparation process,the parameter settings of the microfluidic device and the contents of the dispersion affected the sizes,morphologies,structures and performance of the beads.2.Graphene/carbon nanotube porous magnetic beads were prepared by emulsion process under continuous heating and vigorous stirring.3.Carbon nanotube and graphene/carbon nanotube core-shell beads were utilized to fabricate working electrode using coating method.And the electrochemical tests were employed to study their practical applications in supercapacitors.4.Separation of water-in-oil emulsions using graphene/carbon nanotube porous beads and absorption behavior of magnetic porous and porous magnetic beads for oils and organic solvents were tested to evaluate their practical value in water treatment.