We present electronic transport measurements of single-and bilayer graphene on commercially available hexagonal boron nitride. We extract mobilities as high as 125 000 cm 2 V −1 s −1 at room temperature and 275 000 cm 2 V −1 s −1 at 4.2 K. The excellent quality is supported by the early development of the ν = 1 quantum Hall plateau at a magnetic field of 5 T and temperature of 4.2 K. We also present a new and accurate transfer technique of graphene to hexagonal boron nitride crystals. This technique is simple, fast and yields atomically flat graphene on boron nitride which is almost completely free of bubbles or wrinkles. The potential of commercially available boron nitride combined with our transfer technique makes high mobility graphene devices more accessible.
The concept and analysis of a graphene plasmonic nanoantenna over a SiO2/Si substrate at terahertz (THz) band are presented. The performance enhancement of the antenna is proposed by dynamically controlling the surface conductivity of graphene using an electric field effect. The controlling ability of graphene via gate voltage enables frequency reconfiguration of the antenna over a wide range of 2.56–4.98 THz. The performance merits of the antenna are its high directivity, broadside radiation pattern, low reflection coefficient, stable impedance and high miniaturisation. The proposed graphene plasmonic antenna has potential to be used for THz communication.
THz antennas are gaining interest in many applications. In this article, we compared the performance of THz antennas made up of copper, graphene, and carbon nanotube in a view to choose a suitable material for effective THz antennas. Material properties of these possible materials are analyzed to justify the electromagnetic performance of antennas made out of these materials. A typical dipole antenna with 1THz resonant frequency is used as the candidate antenna to make the comparisons. The graphene antenna shows better electromagnetic performance with their counterparts.
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