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      Stretchable and Transparent Biointerface Using Cell-Sheet-Graphene Hybrid for Electrophysiology and Therapy of Skeletal Muscle

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          Most cited references 55

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          Measurement of the elastic properties and intrinsic strength of monolayer graphene.

          We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 Nm(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
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            Is Open Access

            30 inch Roll-Based Production of High-Quality Graphene Films for Flexible Transparent Electrodes

            We report that 30-inch scale multiple roll-to-roll transfer and wet chemical doping considerably enhance the electrical properties of the graphene films grown on roll-type Cu substrates by chemical vapor deposition. The resulting graphene films shows a sheet resistance as low as ~30 Ohm/sq at ~90 % transparency which is superior to commercial transparent electrodes such as indium tin oxides (ITO). The monolayer of graphene shows sheet resistances as low as ~125 Ohm/sq with 97.4% optical transmittance and half-integer quantum Hall effect, indicating the high-quality of these graphene films. As a practical application, we also fabricated a touch screen panel device based on the graphene transparent electrodes, showing extraordinary mechanical and electrical performances.
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              Epidermal electronics.

              We report classes of electronic systems that achieve thicknesses, effective elastic moduli, bending stiffnesses, and areal mass densities matched to the epidermis. Unlike traditional wafer-based technologies, laminating such devices onto the skin leads to conformal contact and adequate adhesion based on van der Waals interactions alone, in a manner that is mechanically invisible to the user. We describe systems incorporating electrophysiological, temperature, and strain sensors, as well as transistors, light-emitting diodes, photodetectors, radio frequency inductors, capacitors, oscillators, and rectifying diodes. Solar cells and wireless coils provide options for power supply. We used this type of technology to measure electrical activity produced by the heart, brain, and skeletal muscles and show that the resulting data contain sufficient information for an unusual type of computer game controller.

                Author and article information

                [1 ]Center for Nanoparticle Research; Institute for Basic Science (IBS); Seoul 151-742 Republic of Korea
                [2 ]School of Chemical and Biological Engineering; Institute of Chemical Processes; Seoul National University; Seoul 151-742 Republic of Korea
                [3 ]Center for Nanoparticle Research; Institute for Basic Science (IBS); Seou 151-742 Republic of Korea
                [4 ]Department of Radiology; Seoul National University College of Medicine; Seoul 110-744 Republic of Korea
                [5 ]Center for Mechanics of Solids, Structures, and Materials; Department of Aerospace Engineering and Engineering Mechanics; Texas Materials Institute; University of Texas at Austin; 210 E 24th Street Austin TX 78712 USA
                [6 ]Center for Neural Science; Brain Science Institute; Korea Institute of Science and Technology; Seoul 136-791 Republic of Korea
                Advanced Functional Materials
                Adv. Funct. Mater.
                May 2016
                May 2016
                March 15 2016
                : 26
                : 19
                : 3207-3217
                © 2016




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