Fabrication And Application Of Carbon Nanotubes Based Conductive And Superhydrophobic Materials

With the rapid progress of information technology,artificial intelligence terminals have gained its popularity,and electronic products have become people’s daily necessities.However,conductive materials are easily wetted by water to cause short circuits,which will not only damage integrated devices,but also endanger users’safety.Superhydrophobic surface is considered to be one of the most effective ways to stabilize equipment performance due to their excellent water resistance,corrosion resistance and self-cleaning capabilities.In recent years,conductive and superhydrophobic materials have been successfully used in fields such as deicing,electromagnetic shielding,underwater detection,and wearable sensors.In this paper,carbon nanotubes(CNTs)and polymer were used to prepare conductive and superhydrophobic materials by simple methods,and the products were applied in the fields of deicing,oil-water emulsion separation and pressure sensor.The main research contents and results are listed as following:(1)CNTs were deposited on the mixed cellulose(MCE)filter membrane through vacuum filtration to construct the conductive network and micro-nano rough structure.Polydimethylsiloxane(PDMS)solution was then filtered over it to increase the mechanical strength of the membrane.After the PDMS was cured,the MCE filter membrane was dissolved to obtain a conductive and superhydrophobic PDMS@CNTs membrane.Scanning electron microscope(SEM),3D morphometer,contact angle tester and multimeter were utilized to study the effects of the concentration of PDMS solution on the surface morphology,wettability and conductivity of the membrane.The results showed that as the concentration of PDMS solution increased,the surface roughness,hydrophobicity and conductivity of the membrane decreased.When the concentration of PDMS solution was 10%,the membrane has the best comprehensive performance.The water contact angle(WCA)and water sliding angle(WSA)of the membrane reached 167~o and 2.9~o,respectively,and its resistance was 650Ω/cm.The PDMS@CNTs membrane can separate a variety of water-in-oil emulsions efficiently and maintain good cycleability.In addition,due to its excellent electrothermal conversion ability and superhydrophobicity,the membrane can also achieve quick deicing at low voltage.(2)Three-dimensional porous CNTs/CS aerogel was fabricated by mixing carboxylated CNTs(CNTs-COOH)and chitosan(CS)via freeze-drying method.Through the dip coating process,graphene oxide(GO)was uniformly coated on the surface of the aerogel,and reduced by ascorbic acid.Then,1H,1H,2H,2H-perfluorooctyltriethoxysilane(FAS)was used to hydrophobic modify it to finally obtain conductive and superhydrophobic FAS modified reduced graphene oxide Coated CNTs/CS(F-r GO@CNTs/CS)aerogel.Fourier transform infrared(FT-IR)spectrometer,thermogravimetric analyzer(TGA),X-ray photoelectron spectroscopy(XPS)and SEM were used to confirm the chemical composition and morphology of the products at each stage.The obtained aerogel has good compressibility and repeatability.The WCA of the aerogel was 154~o,and it can maintain its superhydrophobic performance during compression process.Due to the porous structure of the aerogel and the synergistic effect of r GO and CNTs,aerogel also exhibited excellent pressure responsiveness and stability,which can be utilized as a piezoresistive pressure sensor to detect human motions,even under wet or corrosive environments.