Advances in the development of graphene nanopores in modern physics
Graphene is a typical two-dimensional nanomaterial consisting of a single layer of carbon atoms in a honeycomb lattice. Perfect single-layer graphene is incapable of permeating any molecules. It is the thinnest and most widely used membrane material capable of separating two phases. Graphene with nanopores exhibits excellent solution ion and gas molecular selectivity, and has broad application prospects in seawater desalination, sewage treatment, air purification and other fields. Currently, many methods for preparing graphene nanopores have been developed internationally, but how to quickly prepare high-density nanopores on large-area graphene samples has not yet been effectively solved. Researchers at the Institute of Materials Research of the Institute of Modern Physics, Chinese Academy of Sciences, on the basis of polymer nanopore research, have invented a new method for rapidly preparing large-area porous graphene with microporous support, which solved the bottleneck problem in current porous graphene research. . Researchers transferred a large area of ​​graphene to a PET film to form a G/PET composite structure (Panel A), and then irradiated the G/PET composite structure with high-energy heavy ions provided by Lanzhou Heavy Ion Accelerator to form graphene nanoholes. Latent tracks were formed in PET (Figure B); tapered holes were then formed in PET using asymmetric etching and graphene nanopores with micropores were formed (Figure C). This method gives full play to the characteristics of high ion energy and strong penetrating ability of Lanzhou heavy ion accelerator. It can conveniently and quickly prepare porous graphene with controlled pore area and large pore area with controlled micropore, and obtained authorized invention patent. The researchers used this method to prepare a single graphene nanopore and accurately studied the transport properties of ions in the nanopore. It was found that the graphene nanopore not only has a good ion selectivity, but also exhibits a giant ion rectification effect. The results are of great significance in the development of micro-nanofluidic devices and the preparation of graphene nanofiltration membranes. The research work was supported by the National Natural Science Foundation of China and the Youth Innovation Promotion Association of the Chinese Academy of Sciences. The relevant research results were published on ACS Applied Materials & Interfaces. Eggcrate Grille,Egg Crate Grilles,Egg Crate Return Grille,Aluminum Egg Crate Grille Guangzhou Jointair Co., Ltd. , https://www.jointairaccessories.com
Preparation of Graphene Nanopore by Heavy Ion Irradiation