(a) Schematic diagram of E-beam bombardment to induce graphene onto polyimide. (b) SEM image; (c) Raman and XRD spectra of EIG and polyimide films. (d) CV curves for different scan rates for EIG electrode; e) GCD diagrams for different current densities; f) Photothermal performance at -40 C. Credit: Li NianRecent work by Prof. Wang Zhenyang's research team at the Hefei Institutes of Physical Science, (HFIPS), of the Chinese Academy of Sciences has produced porous graphene films in three dimensions.The researchers used a high-energy electron beam to generate the energy source. They also took advantage of the low kinetic energy and low reflection properties of e-beam to directly induce polyimide precursor into a porous graphene crystal layer with a thickness up to 0.66mm. The journal Carbon published related research results.Graphene is a strategic new material due to its many exceptional chemical and physical characteristics. The integration of a 3D porous graphene network prevents graphene sheets from being rearranged and allows easy access to ions and diffusion. It is still difficult to synthesize thick, porous 3D porous graphene films.High instantaneous energy can cause the carbonization of carbon-containing materials to form graphene. The laser's penetration depth into the carbon-containing matrix is very low. This results in a thin prepared graphene film that can be used in real devices. Exploring a more efficient energy source is therefore a critical problem that must be addressed immediately for industrial use of high-energy beam-induced Graphene.Researchers used a high energy e-beam to produce efficient 3D thick porous graphene crystal films using the polyimide precursor.High-energy e beams offer many advantages over lasers. They have zero reflection, high energy kinetic energy and injection effect. The e-beam is also easier to control than lasers. This makes it a more efficient energy source to carbonize polyimide precursors quickly to make graphene.Polyimide's hydrogen, oxygen, and other components can quickly escape as gas. This results in a dense 3D pore structure in graphene.The thickness of the e-beam-induced graphene film (EIG) is 0.66 mm. Also, the synthesis rate is 84 cm2/min. This is significantly higher than the laser's synthesis rate. EIG has also been successfully used in the field of supercapacitor electrodes, which exhibits excellent electrochemical storage.EIG has a strong photothermal performance and can be used in the field of solar photothermal deicing or anti-icing. Temperatures as low as -40 C can be achieved, which is considered ultralow.For supercapacitors with better performance, explore more graphene electrodesMore information: Shuai Han and al, E beam direct synthesis macroscopic thick 3D porous graphene films. Carbon (2021). Information from the Journal: Carbon Shuai Han et al., E-beam directly synthesis of macroscopic thick3D porous graphene film, (2021). DOI: 10.1016/j.carbon.2021.06.035
