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      Carbon‐Based Nanomaterials and Sensing Tools for Wearable Health Monitoring Devices

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          Electric Field Effect in Atomically Thin Carbon Films

          We describe monocrystalline graphitic films, which are a few atoms thick but are nonetheless stable under ambient conditions, metallic, and of remarkably high quality. The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands, and they exhibit a strong ambipolar electric field effect such that electrons and holes in concentrations up to 10 13 per square centimeter and with room-temperature mobilities of ∼10,000 square centimeters per volt-second can be induced by applying gate voltage.
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            Fine structure constant defines visual transparency of graphene.

            There are few phenomena in condensed matter physics that are defined only by the fundamental constants and do not depend on material parameters. Examples are the resistivity quantum, h/e2 (h is Planck's constant and e the electron charge), that appears in a variety of transport experiments and the magnetic flux quantum, h/e, playing an important role in the physics of superconductivity. By and large, sophisticated facilities and special measurement conditions are required to observe any of these phenomena. We show that the opacity of suspended graphene is defined solely by the fine structure constant, a = e2/hc feminine 1/137 (where c is the speed of light), the parameter that describes coupling between light and relativistic electrons and that is traditionally associated with quantum electrodynamics rather than materials science. Despite being only one atom thick, graphene is found to absorb a significant (pa = 2.3%) fraction of incident white light, a consequence of graphene's unique electronic structure.
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              Flexible triboelectric generator

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                Author and article information

                Contributors
                Journal
                Advanced Materials Technologies
                Adv Materials Technologies
                Wiley
                2365-709X
                2365-709X
                March 2022
                October 05 2021
                March 2022
                : 7
                : 3
                : 2100572
                Affiliations
                [1 ]UNAM‐National Nanotechnology Research Center Bilkent University Ankara 06800 Turkey
                [2 ]Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey
                Article
                10.1002/admt.202100572
                54abced0-7c6f-4628-a9c3-c3c216b587e0
                © 2022

                http://onlinelibrary.wiley.com/termsAndConditions#vor

                http://doi.wiley.com/10.1002/tdm_license_1.1

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