Graphene is a typical two-dimensional nanomaterial consisting of single-layered carbon atoms in a honeycomb lattice. Perfect monolayer graphene is impermeable to any molecule and is the thinnest and separable biphasic separator material to date. Graphene with nano-pores shows excellent selectivity for solution ions and gas molecules, and has broad application prospect in the fields of seawater desalination, sewage treatment, air purification, etc. At present, a variety of graphene nanopores have been developed internationally However, how to quickly prepare high-density nanopores on large-area graphene samples has not been effectively solved.Ministry of Modern Physics Materials Research Center, based on the polymer nanopore research, invented a rapid preparation of microporous Supported a large area of porous graphene new method to solve the bottleneck in the current porous graphene research.
Researchers transferred a large area of graphene to a PET film to form a G / PET composite structure (Figure A), and then irradiated the G / PET composite structure with high energy heavy ions from a Lanzhou heavy ion accelerator to form a graphene nanopore (Figure B) was formed in PET. Conical holes were then formed in PET using asymmetric etching to form graphene nanopores with microporous support (Figure C). This method gave full play to Lanzhou heavy ions Accelerator ion energy is high, penetrating ability is strong, can be easily and quickly prepared with microporous support a large area, porous density controllable porous graphene, obtained a patent for invention patents.
Recently, the researchers successfully prepared a single graphene nanopore by this method and accurately studied the transport properties of the ions in the nanopore. It was found that the graphene nanopore not only has good ion selectivity but also shows huge ion rectification The results are of great significance in the development of micro-nano flow control devices and in the preparation of graphene nanofiltration membranes.The research was supported by the National Natural Science Foundation of China and the Youth Innovation Promotion Association of Chinese Academy of Sciences. The research results were published on ACS Applied Materials & Interfaces.