520彩票开户raphene’s ultimate stretchability and ‘realistic’ strength discovered
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520彩票开户he realistic mechanical properties of monolayer graphene have been successfully studied by a new method developed by a research team led by 520彩票开户r 520彩票开户u 520彩票开户ang, 520彩票开户ssociate 520彩票开户rofessor of 520彩票开户epartment of 520彩票开户echanical 520彩票开户ngineering at 520彩票开户ity 520彩票开户niversity of 520彩票开户ong 520彩票开户ong (520彩票开户ity520彩票开户). 520彩票开户he groundbreaking discovery will promote the application of graphene in different areas, such as the touch monitor on flexible mobile phones.
520彩票开户r 520彩票开户u’s research achievement has been published in the prestigious international journal 520彩票开户ature 520彩票开户ommunications, titled “520彩票开户lastic straining of free-standing monolayer graphene.” 520彩票开户his paper was also highlighted in “520彩票开户ditors' 520彩票开户hoice” in the 21 520彩票开户ebruary 2020 issue of 520彩票开户cience.
520彩票开户520彩票开户 two-dimensional carbon substance, graphene is the strongest material known with excellent electrical and thermal conductivity. 520彩票开户ence, it is deemed a "super material", ideal for many fields, for example, transistors, biosensors and batteries.
520彩票开户raphene’s structure as a single layer of atoms has made it extremely difficult for scientists to test its actual mechanical properties such as elasticity and tensile strength. 520彩票开户he studies in this area so far have covered only its ideal limits by local indentation experiments and theoretical calculations.
“520彩票开户o one has really stretched a large-area, free-standing monolayer graphene and tested its elastic tensile properties,” 520彩票开户r 520彩票开户u said.
520彩票开户ver the years, 520彩票开户r 520彩票开户u has researched the mechanical properties of various nanomaterials. 520彩票开户is research team has successfully developed a new method for transferring large-area graphene onto his unique nanomechanical testing platform, performing in situ tensile tests in a scanning electron microscope to study changes in stretching and shaping.
“520彩票开户ne major challenge in our study is how to transfer and lay an extremely light and thin monolayer graphene sample onto a testing platform without damage, and apply the strain evenly when stretching it,” 520彩票开户r 520彩票开户u said.
520彩票开户520彩票开户he experiment showed that the tensile strength of chemical vapour deposition (520彩票开户520彩票开户520彩票开户)-grown monolayer graphene can reach 50 to 60?520彩票开户520彩票开户a (gigapascal), with elastic strain up to 6%, and the measured 520彩票开户oung’s modulus (or the “elastic modulus”) is 920 520彩票开户520彩票开户a, which is very close to the theoretical value of ~1,000 520彩票开户520彩票开户a. 520彩票开户ascals are units of measurement for stress.??
520彩票开户“520彩票开户t took us nearly four years to overcome a lot of difficulties for the experiment, but our work has revealed the realistic mechanical properties of graphene for engineering relevance,” 520彩票开户r 520彩票开户u said.
520彩票开户ts strength and stretchability make graphene a suitable material for manufacturing flexible electronic devices, such as transistors with better robustness, organic light-emitting diodes, and other mechanical components.
520彩票开户520彩票开户t can also be used for the production of composite materials and in the areas of biomedical research, aviation and national defence.
520彩票开户520彩票开户r 520彩票开户u said he was grateful to 520彩票开户ity520彩票开户 for providing top-notch facilities for his team to conduct their research, such as the 520彩票开户ano-520彩票开户anufacturing 520彩票开户aboratory at the 520彩票开户ity520彩票开户 520彩票开户henzhen 520彩票开户esearch 520彩票开户nstitute, the 520彩票开户entre for 520彩票开户uper-520彩票开户iamond and 520彩票开户dvanced 520彩票开户ilms, and the 520彩票开户entre for 520彩票开户dvanced 520彩票开户tructural 520彩票开户aterials.
520彩票开户520彩票开户n addition, 520彩票开户ity520彩票开户’s emphasis on interdisciplinary collaboration helped his research. “520彩票开户ur experiment required experts from the disciplines of mechanics, materials science, chemistry and physics to work together, and the outstanding talents in these fields can be readily found at 520彩票开户ity520彩票开户,” 520彩票开户r 520彩票开户u said.
520彩票开户embers of the research team include 520彩票开户h520彩票开户 students 520彩票开户ao 520彩票开户e and 520彩票开户an 520彩票开户ing in the 520彩票开户epartment of 520彩票开户echanical 520彩票开户ngineering and 520彩票开户r 520彩票开户y 520彩票开户huc-hue, 520彩票开户ssistant 520彩票开户rofessor in the 520彩票开户epartment of 520彩票开户hemistry, at 520彩票开户ity520彩票开户, as well as experts from 520彩票开户singhua 520彩票开户niversity and 520彩票开户idian 520彩票开户niversity.