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Researchers at the Hong Kong Polytechnic University have invented a graphene-based environmental heat battery. The battery uses silver and gold as electrodes, and a graphene is connected between the electrodes. This structure can collect the thermal energy of ions moving in the copper chloride solution at room temperature. Six such devices can generate voltages in excess of 2 volts. Related research work was pre-published on arXiv. Research by researchers at the Korea Institute of Electronics Technology, published in NanoLetters, showed that they developed a method of stamping graphene with an electric moving roller. The researchers used a roller to print a regularly arranged PMMA polymer solution on a graphene layer of a flexible substrate, which was used as a mask to etch graphene and fabricated a transistor. Geim and Novoselov of the University of Manchester in the United Kingdom proposed a new solution to the problem of excessive leakage current of graphene transistors: the use of electrons perpendicular to the channel effect in the plane of the graphene to build transistors. They stacked the graphene layer, boron nitride and molybdenum disulfide atomic layers, and the tunnel transistor constructed worked well. Related research work was published on Science. Researchers at Vanderbilt University in the United States have found that single-layer graphene, which is prepared directly on copper or nickel, or transferred to other metals, provides corrosion protection and is the world's thinnest anti-corrosion coating. Related research work was published on ACSNano. Researchers at Northwestern University have vented oxygen into an ultra-high temperature vacuum chamber in which hot tungsten filaments heated to 1500 degrees Celsius decompose oxygen molecules into oxygen atoms. Thereafter, highly active oxygen atoms are uniformly embedded in the graphene lattice. The graphene oxide method can avoid the lattice structure damage caused by the commonly used Hummers method and improve its photoelectric performance. Related research work was published on NatureChemistry. Researchers at the University of Edinburgh in the United Kingdom believe that graphene nanoflakes can accumulate in the lungs and cause damage, which poses a health risk. Related research work was published on ACSNano.