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Metamaterial analogues of electromagnetically induced transparency (EIT) have been intensively studied and widely employed for slow light and enhanced nonlinear effects. In particular, the active modulation of the EIT analogue and well-controlled group delay in metamaterials have shown great prospects in optical communication networks. Here we integrate a monolayer graphene into metal-based terahertz...
A series of novel composite catalysts consisting of carbon spheres with encapsulated copper species were synthesized by incipient wetness impregnation. To improve catalytic activity, Cu location on the hollow carbon spheres was tuned by ultrasonic-assisted impregnation. The location, dispersion and chemical structure of copper species were characterized by X-ray diffraction, Temperature-programmed...
In-situ two-dimensional grazing incidence X-ray diffraction was applied in isothermal growth of graphene on nickel through chemical vapor deposition. The analyses showed that the graphene interlayer spacing decreases with the increasing number of graphene layers (growth time increase). Moreover, the as-deposited graphene can be gradually removed through in-situ Ar annealing treatment and inverse interlayer...
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