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Manchester, United Kingdom

Kim H.-Y.,University of Manchester | Dawood O.M.,University of Manchester | Monteverde U.,University of Manchester | Sexton J.,University of Manchester | And 5 more authors.

Graphene was grown on copper and repeatedly transferred onto a GaAs semi-insulating substrate to form multilayers (1-10). These manually stacked graphene layers resulted in appreciable local variations of optical properties due to the local differences of stacking orders. In addition, most of the observed 2D/G intensity and area ratios of an n-multilayer CVD graphene is consistent with the characteristics of a single layer repeated n-times. However, multilayer graphene has many kinds of advantages for applications to optoelectronic devices. First, the G band shift is not related to the stacking order, proving that multilayer graphene reduces doping and strain effect from the substrate, which is confirmed by Raman results after metal electrode deposition. Second, the sheet resistance decreases with increasing number of layers and after thermal annealing. Another benefit of multilayer graphene is that each layer can be annealed after transfer, which greatly improves the sheet resistance and its lateral uniformity without intentional doping. We therefore conclude that multilayer CVD graphene is a good candidate for various GaAs-based electrical applications and its good electrical uniformity allows fabrication of devices on large scales. © 2015 Elsevier Ltd. Source

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About BGT Materials Limited The BGT Vision and Mission BGT Materials Limited (BGT), established in 2013, is dedicated to the development of graphene technologies that utilize this wonder material to enhance our lives. BGT has pioneered the mass production of large-area, high-quality graphene rapidly achieving the first milestone required for the commercialization of graphene-enhanced applications ...

Huang X.,University of Manchester | Leng T.,University of Manchester | Chen J.C.,BGT Materials Limited | Chang K.H.,BGT Materials Limited | Hu Z.,University of Manchester
2016 10th European Conference on Antennas and Propagation, EuCAP 2016

This paper reports shielding effectiveness of screen printed graphene laminate for EMI applications. The graphene laminate was screen-printed on normal paper and cut to fit C band waveguide size (34.85 × 15.80 mm2) for measurement. The measurement results show that the average shielding effectiveness is above 32 dB across the whole C band, indicating that screen printed graphene laminate can be a viable alternative to printed metal to provide desired reflection loss. © 2016 European Association of Antennas and Propagation. Source

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