October 15th (Beijing time) reported that the latest research from researchers at the University of Manchester in the UK shows that stacking monoatomic layers accurately is expected to create a large number of new materials and equipment. s Choice. In the desired order, they stacked monolayer crystals of graphene and boron nitride layer by layer to build a "multi-layer cake" that could be used as a nano-scale transformer. Related papers were published on the website of the journal Nature? Physics on October 14.
Since it was first isolated in 2004, graphene has brought the possibility of radical change in many fields. From smartphones, ultrafast broadband, computer chips to drug delivery, graphene is expected to replace existing silicon materials. The study was led by Leonid Ponomarenko and Nobel Prize winner Andre Gaim of the University of Manchester. They believe that people have not yet found a stage where graphene can really show their talents, and new equipment and materials that can exert their excellent properties. Not yet invented.
In the nano-transformer, due to the local electric field, when electrons move in one layer of metal, they will exert a pulling force on the electrons in another layer of metal. This phenomenon is called "coulomb drag". To take advantage of this rule, it is necessary to separate layers of metal to insulate them from each other, but the separation distance cannot exceed a few atomic distances. This structure is the basis of many sophisticated new electronic and photonic devices, including many transistors and detectors using this new structure. This is not possible with existing materials, which is a huge leap forward for current nanotechnology.
The researchers used graphene as a single-atom conductive plane and boron nitride, which is only 4 atoms thin, as an electrical insulator. They first stripped the graphene plane from the bulk graphite, and obtained the boron nitride atomic layer using the same technology, and then used an advanced nanotechnology to combine the graphene and boron nitride crystals like a "Lego" toy. Layers are stacked, and new crystals are assembled in the desired order of layers.
The nano-transformer was assembled by Roman Gorbachev of the University of Manchester. He described this technique: “It ’s like the plot in“ The Story of a Clockwork Steel Flea â€. Only the highest magnification microscope can see the fleas dancing. There are even tiny horseshoes nailed. Our nano 'base height' is a further deduction of this technology. "
Gaim added: "This research also proves that building planes layer by layer with atomic precision can create complex devices with multiple functions. We have a complete library of atomic layer materials, as long as these materials are combined , It is possible to create major new materials that are not available in nature, and the prospect of this path is more exciting than graphene itself. "
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