Graphene materials are widely used in many fields such as lithium-ion batteries, sensing, energy storage materials, and biomedicine due to their excellent physical and chemical properties. To develop green, efficient, and low-cost new methods to make graphene better Dispersing in aqueous solutions or other low-boiling organic solutions is an important research topic in the field of graphene materials. China is a large country in the research and development of graphene. What are the recent scientific and technological developments in the graphene industry?
Tsinghua University Bionic Graphene Pressure Sensor Research made important progress
Professor Ren Tianling from the Department of Microelectronics at Tsinghua University presented the “High sensitivity and wide linear range graphene pressure sensor with bionic acupuncture random distribution structure” at the ACS Nano. The research results of Sensor with Random Distributed Spinosum for High Sensitivity and Large Linearity propose a similar bionic structure based on the human sensory micro-structure. Through the combination of micro-structure and distribution patterns, the conflict between sensitivity and linear range is resolved. The comprehensive improvement of device performance provides a new way of thinking. The research results have been supported by the National Natural Science Foundation of China's key projects and the Ministry of Science and Technology.
Shanghai Institute of Microsystems has made progress in the preparation of water-soluble graphene
Recently, researchers from the Graphene Powder Materials Research Group of the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Ding Guqiao and He Peng have made progress in the preparation of water-soluble graphene materials: Innovative electrochemical technology and ultrasonic-assisted dispersion Mechanisms for the preparation of low-concentration, high-concentration, water-soluble graphenes in a mixed electrolyte system of NaOH and PTA. The relevant research results are published online in Green Chemistry. In this system, researchers controlled the electrochemical process to make PTA Precipitation and adsorption on graphite electrodes promotes full oxidation and layer-by-layer exfoliation of the graphite, followed by ultrasonic treatment to further increase the yield, achieving high yield (87.3%), high solids content (8.2 g/L) and high stability (8 The preparation of few-layer micron-size water-soluble graphene with more than one month has obvious advantages over existing studies. At the same time, due to the electrochemical anode molecular adsorption protection mechanism, the sp2 structure of the product sheet is preserved and the film is prepared. After the heat reduction at a lower temperature, a higher conductivity (9517 S/m) is obtained, which has a great potential for application. Oxidation, swelling, electrochemical mechanism of exfoliation, layer-by-layer exfoliation and in-depth oxidation of new electrochemical mechanisms overcome the problems of incomplete product layering, poor quality, low dispersion, and other problems caused by incomplete electrochemical stripping. The research has determined the effect of ultrasound in different environments, different treatment times and different precursor conditions, and has important guiding significance for the process improvement in the follow-up study. The prepared water-soluble graphene is very easy to film and shows in electric heating. The advantages of low voltage, high temperature rise and good temperature consistency are expected to be popularized and applied as new types of electric heating materials.
New graphene-based nano roll can mimic dog nose gas detection
Recently, Chinese researchers published a report in the latest issue of the American Chemical Society·Nano magazine. They said that they have developed high-quality graphene-based nano-rolls that mimic the nose-nosed olfactory function. Chinese researchers have been inspired by dog noses. There are millions of capillaries in the dog's nose, and the surface area is large, which helps the dog to smell the extremely low concentration of odors. The researchers selected a graphene-based nanocoil gas sensor with a large surface area and high temperature stability and durability. South China Researchers from institutions such as Beijing Normal University and Beijing University of Aeronautics and Astronautics use a non-covalent bond supramolecular assembly method to assemble a material called 'Sodium Polystyrene Sulfonate' on the surface of graphene sheets, and then freeze it through orientation control. Drying technology makes the graphene base sheet curl with the dehydration process, so as to get full graphene alkenes. In addition, the production process of graphene based nano roll is simple and efficient, and it is expected to be prepared on a large scale.
Hefei Research Institute made progress in the preparation of graphene and its application in oxygen reduction
Institute of Solid State Physics, Chinese Academy of Sciences, Institute of Solid State Physics, Chinese Academy of Sciences, Preparation and processing of iron-nitrogen-doped porous carbon/graphene composites with dual active sites, and their application in oxygen reduction Progress was made in this area. Related work was published on ACS Applied Materials & Interfaces. This research provides new research ideas for the construction and development of new metal-nitrogen/carbon-based electrocatalysts and is expected to replace precious metal platinum for fuel cells and metals. Air Battery. The research work was funded by the National Key Basic Research Development Program (973 Program), the National Natural Science Foundation of China, and the Scientific Research Equipment Development Project of the Chinese Academy of Sciences.
Shanghai Gaogao Institute, etc. made new progress in the study of graphene oxide frame films
Recently, the Key Laboratory of Low Carbon Conversion Science and Engineering of the Chinese Academy of Sciences and the Shanghai Advanced Research Institute of the Chinese Academy of Sciences and the Shanghai University of Science and Technology Low Carbon Energy Joint Laboratory have made progress in the self-assembly of graphene oxide frame composite membranes for the screening of small gas molecules. In this study, the researcher Sun Yuhan and Zengfeng team selected thiourea (TU) with cross-linking molecules that have two NH2- and C=S-multi-activity terminals, a molecular skeleton of only 3 atoms, and weak reducibility. In order to obtain a homogeneous and continuous GOF composite membrane, the team first reacted with GO by grafting active groups on the surface of the carrier to immobilize a single layer of GO on the carrier; then by dehydration condensation and nucleophilic addition reaction of TU, GO, in the carrier On the periodic assembly to form a homogeneous TU-GOF composite film, the first layer to achieve self-assembly. Through the condition control, TU-GOF film layer spacing can be precisely controlled, the film thickness can be controlled in tens of nanometers. Characterization results confirmed that TU The immobilization of the carbon layer greatly inhibits the swelling and deformation of the membrane in the separation medium and significantly enhances the mechanical stability of the membrane. The separation results indicate that the TU-GOF membrane is highly selective for H2, such as H2/CO2, H2/ N2 and H2/CH 4 Ideal selectivity is ~200, H2 permeation rate is 10-7 mol/m2/s/Pa. This is the first time that GO base film is based on two-dimensional inter-layer screening for efficient separation of H2, and the performance is much higher than that of polymer film Robeson. The upper limit is also superior to most inorganic membranes.
In 2018, the direction of R&D of graphene is mainly toward new areas and lighter development. There has been great progress in the integration of graphene materials and other technologies. It is believed that in the future, graphene will definitely There is more room for development.
