Recently, professor He Daping’s team from School of Natural Sciences of Wuhan University of Technology made an innovative breakthrough in research on macroscopic graphene films.The two-dimensional nanosheets electrostatic repulsion aligning strategy they put forward had effectively improved the batched production of high quality macroscopic graphene films. The paper entitled “Scalable Assembly of High Quality Graphene Films Via Electrostatic Repulsion Aligning” with doctoral students Wei Qian and Huaqiang Fu of the team being the co-first authors and professor Baowen Li of School of Materials Science and Engineering being the co-coressponding author, was published in Advanced Materials, the top international journal in the field of material.
Graphene, known as the king of new materials in the 21st century, is both flexible, lightweight and ultra-highly conductive, thermally and corrosion resistant, and has a wide range of promising applications in the fields of thermal management, sensors and electronic devices. To realize the macroscopic applications of graphene materials, they need to be assembled into high-quality macroscopic materials. Conventional synthesis of high-performance macroscopic graphene films is usually realized by using graphene oxide as a precursor and undergoing complex processes such as chemical and high temperature reduction and roll pressing. In comparison with the traditional method, using pristine graphene with low fraction of defects as precursors can effectively avoid the high energy consumption problems associated with complex processes. However, the voids and irregular arrangement of micro-sized graphene generated during macroscopic assembly will greatly degrade various intrinsic properties of macroscopic graphene films.
Preparation characterization and performance diagram of macroscopic pristine graphene hybrid films
Based on the team’s previous research on the interaction between graphene and two-dimension nanometer materials (MOF Nanosheets, Mxene, etc) (ACS Nano, 2022, 16, 3934；iScience, 2022, 25, 105001), this paper puts forward the method of producing highly ordered and compact macroscopic graphene films by adding traces of highly electronegative titania nanosheets (TiNS) to the precursor of pristine graphene (PG), which uses the electrostatic repulsion aligning effect between two-dimension materials. The research has shown that the high electronegativity of titania nanosheets improves the dispersion of the aqueous graphene, thereby promoting the ordered self-assembly of the graphene nanosheets. Compared with the macro films assembled with pure aqueous graphene, the microstructure defects of the optimized prepared macro graphene films were greatly reduced, and the orientation of the stacked graphene lamellar was significantly improved, which remarkably advance macro graphene films’ comprehensive properties. Among all the enhanced properties, the electrical conductivity has been improved by nearly an order of magnitude (up to 1.285×105 S/m), the tensile strength has been increased by almost 4 times, and the excellent flexibility (the ability to withstand over 5000 folding times) has been demonstrated.
The high-quality and low-cost macroscopic assembly of graphene is the key problem for realizing its application. This strategy using the electrostatic repulsion aligning effect is simple, effective and accessible to large-scale production, which has important scientific significance and practical value for the control, assembly and manufacture of graphene and other two-dimension materials. The research is supported by Nan Cewen from Tsinghua University, an academician of Chinese Academy of Sciences, and funded by the National Key Research and Development Program and the National Natural Science Foundation of China.
He Daping, professor and doctoral supervisor of WUT, is the current associate dean of the School of Natural Sciences and the director of Hubei Institute of Technical Specialized Research on Macro Graphene. He mainly engages in the preparation and application of functional graphene, especially its synthesis and structural adjustment, as well as its application in intersections such as thermal management, new energy equipment, sensors, radio frequency and RF microwave. Relying on the related industry-university-research supporting platform, Prof.He’s research team has successfully promoteda number of research transformation. He was supported by the “Royal Society-Newton International Fellowship”, and selected as “Hubei High-level Talent (entrepreneurship)”, “Wuhan Talent (entrepreneurship)” and so on. In 2022, his team obtained the honorary title of “Chinese Pioneer of National Workers”.
Link to the paper: https://doi.org/10.1002/adma.202206101
Reported by: QianWei
Rewritten by: ChaoYijia, Tian Yuxiao
Edited by: Li Tiantian
Source: Schoolof Natural Sciences