Graphene can be "cut" into nanomachines

Paper-cut art can cut paper into complex patterns, such as snowflakes. The physicists at Cornell University in the United States also turned into paper-cut artists. However, the "paper" in their hands is only one atom thick graphene. They may be cut out by the world's smallest machine.

The research team led by Paul McEwan, director of the Cornell Nanoscale Scientific Research Institute at Cornell University, published a paper in the latest Nature magazine, showing how the graphene will be only 10 microns thick (people’s Hair is approximately 70 microns thick. Cut, fold, twist, and bend into a variety of shapes to extend the art of cutting to the nanoscale.

At this microscopic scale, graphene and other ultra-thin materials can become very viscous. Therefore, the researchers used a routine trick to make it easier to manipulate: Graphene was suspended in surfactant-added water, just like slippery soapy water. They made a gold pull ring as a "handle" to be able to grasp the end of the sculpted graphene. In addition, the researchers borrowed a laser cutting machine, created a paper model according to the design, and then produced it with graphene.

They used a sheet of graphene to create a soft spring that works like a very flexible transistor. McEwan says that the force required to pull this spring is comparable to the power that a dynein might produce. This experiment has entered the biomechanics category, opening up ideas for the application of nano-scale elastic devices, such as the sensor can be placed near the human body cells or in the brain.

The researchers also demonstrated how to bend graphene into a simple hinge design and quantify the required force. They found that opening and closing the hinge 10000 times, it is still completely intact, flexible, which may be a useful feature for nano-scale folding machines and equipment.

A related research group at Cornell University has received funding from the U.S. Department of Defense to adopt some of the paper-cutting theories shown in this study and continue to develop technology around flexible materials such as graphene. (Reporter Chen Dan)

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