Graphene nano-cutting using biologically derived metal nanoparticles |
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| Affiliation: | 1. Dept. of Industrial Engineering, GITAM Institute of Technology, Visakhapatnam 530045, India;2. Dept. of Mechanical Engineering, National Institute of Techhnology, Warangal 506004, India;3. Dept. of Mechanical Engineering, NBKR Institute of Technology, Nellore 524413, India;1. KTH Royal Institute of Technology, Sweden;2. Microelectronics and Materials Physics Laboratories, P.O. Box 4500, FI-90014 University of Oulu, Finland;3. Materials Engineering, P.O. Box 4200, FI-90014 University of Oulu, Finland;1. Faculty of Manufacturing Engineering, University Malaysia Pahang, Pekan, Pahang 26600, Malaysia;2. Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan;3. Division of Mechanical Engineering and Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan;1. Applied and Environmental Geophysics Group, Institute of Earth Sciences (ISTE), University of Lausanne, Switzerland;2. Department of Geological Sciences, Stanford University, USA;3. Applied and Environmental Geology, University of Basel, Switzerland |
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| Abstract: | We have developed a novel technique to cut graphene films using catalytic metal nanoparticles derived from ferritin, which is one of the proteins that contain a constant amount of Fe oxide in its inner core. For site-selective adsorption of ferritin molecules to sapphire surfaces that are partially covered with graphene films, two methods, dipping and spin-coating, were used. Graphene films were etched by the Fe-catalytic reaction with hydrogen gas at elevated temperatures. It was found that ferritin adsorption sites are controlled by graphene film edges, atomic steps of the sapphire substrate, and solution condition such as molecular concentration and ionic strength. We demonstrate that high density nanoribbons can be fabricated by using the uniformly-sized catalyst nanoparticles derived from ferritin and the aligned etching technique guided by the atomic structures of the substrate surface. |
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