Manchester, United Kingdom

BGT Materials Limited
Manchester, United Kingdom
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BGT Materials Limited | Date: 2017-08-23

A light-emitting diode filament lamp contains: a lamp cap (10), a transparent housing (20), at least one filament support (40), and at least one light-emitting diode (led) filament (30). The lamp cap (10) is electrically connected with an external power supply so as to supply power to the at least one led filament (30), the transparent housing (20) is hollow and includes an opening (21), and each filament support (40) includes a first metal post (41) electrically connected with a positive terminal (51) and includes a second metal post (42) electrically connected with a negative terminal (52). Each led filament (30) includes a first electrode pin (31) electrically connected with the first metal post (41) and includes a second electrode pin (32) electrically connected with the second metal post (42). Any one of graphene, borazon (bn) and thermally conductive ceramic powders is coated on each of the first metal post (41) and the second metal post (42) so as to form a black body radiation layer (43).

A printed radio frequency sensor structure contains: a substrate, a RF antenna arranged on a top surface of the substrate, and a protection layer covering on the RF antenna arranged, wherein plural sensing materials are directly introduced into a RF antenna mixture of the RF antenna. A method of preparing a RFID sensor tag comprising steps of: A). Printing conductive sensing ink/glue on substrate; B. Drying, curing and compressing the conductive sensing ink/glue to form a conductive antenna mixture with plural sensing materials; C). Bonding a chip on a RFID sensing antenna to form a RFID sensor tag; and D). Coating a protection layer on a top of the RFID sensor tag. Here note protection coating can fully, partially or no cover the conductive sensing antenna.

Leng T.,University of Manchester | Huang X.,University of Manchester | Hsin Chang K.,BGT Materials Limited | Cing Chen J.,BGT Materials Limited | And 2 more authors.
Nanotechnology Perceptions | Year: 2016

An overview of the recent development in graphene-based radio frequency (RF) applications is presented. For many years, most graphene researchers focused on fundamental physics and properties. High-conductivity graphene ink has been introduced in RF antenna and wireless applications. Effective shielding against electromagnetic (EM) waves provided by graphene-based materials is also introduced as an important application. New lightweight, mechanically flexible, environmentally friendly and low-cost consumable RF devices show us the possibilities for applying graphene in practical applications in everyday life. These pioneering works could lead the way to even more interesting and exciting future applications. © 2016 Collegium Basilea.

Li Z.,University of Manchester | Kinloch I.A.,University of Manchester | Young R.J.,University of Manchester | Novoselov K.S.,University of Manchester | And 8 more authors.
ACS Nano | Year: 2015

The deformation of monolayer graphene, produced by chemical vapor deposition (CVD), on a polyester film substrate has been investigated through the use of Raman spectroscopy. It has been found that the microstructure of the CVD graphene consists of a hexagonal array of islands of flat monolayer graphene separated by wrinkled material. During deformation, it was found that the rate of shift of the Raman 2D band wavenumber per unit strain was less than 25% of that of flat flakes of mechanically exfoliated graphene, whereas the rate of band broadening per unit strain was about 75% of that of the exfoliated material. This unusual deformation behavior has been modeled in terms of mechanically isolated graphene islands separated by the graphene wrinkles, with the strain distribution in each graphene island determined using shear lag analysis. The effect of the size and position of the Raman laser beam spot has also been incorporated in the model. The predictions fit well with the behavior observed experimentally for the Raman band shifts and broadening of the wrinkled CVD graphene. The effect of wrinkles upon the efficiency of graphene to reinforce nanocomposites is also discussed. © 2015 American Chemical Society.

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 | Year: 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.

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.
Carbon | Year: 2016

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.

Huang X.,University of Manchester | Leng T.,University of Manchester | Chang K.H.,BGT Materials Limited | Chen J.C.,BGT Materials Limited | And 2 more authors.
2D Materials | Year: 2016

Graphene RF and microwave passive components such as coplanar waveguide transmission lines, open/short-circuited resonators and wideband antenna on paper substrate were designed, screen printed and characterized in this work. The experimental results demonstrate that the screen printed graphene passive components can be used for RF signal transmitting, processing and radiating/receiving; revealing that graphene ink can be a low cost alternative to much more expensive metal nanoparticle inks, such as silver nanoparticle ink. The screen printed graphene is processed at low temperature so that it is compatible with heat-sensitive flexible materials like papers, PTFE (Polytetrafluoroethylene) and textiles. The screen printed graphene passive components reported here are of high conductivity, high flexibility, light weight and low cost, making them ideal candidate for low cost wearable electronics. This work makes it prospective to manufacture RF and microwave passive components in mass production by screen printing in much lower cost to any other known techniques. ©2016 IOP Publishing Ltd.

Aqeeli M.,University of Manchester | Leng T.,University of Manchester | Huang X.,University of Manchester | Chen J.C.,BGT Materials Limited | And 3 more authors.
Electronics Letters | Year: 2015

The potential of highly flexible and conductive graphene laminate is extended to the application of electromagnetic interference shielding. Graphene nanoflake-based conductive ink is printed on paper, and compressed to form a graphene laminate with a conductivity of 0.43 × 105 S/m. The shielding effectiveness is experimentally measured to be above 32 dB between 12 and 18 GHz, even though the thickness of the graphene laminate is only 7.7 μm. It is demonstrated that graphene has great potential in offering lightweight, lowcost, flexible and environmentally-friendly shielding materials. © The Institution of Engineering and Technology 2015.

Huang X.,University of Manchester | Leng T.,University of Manchester | Zhang X.,University of Manchester | Chen J.C.,BGT Materials Limited | And 4 more authors.
Applied Physics Letters | Year: 2015

In this paper, we demonstrate realization of printable radio frequency identification (RFID) antenna by low temperature processing of graphene ink. The required ultra-low resistance is achieved by rolling compression of binder-free graphene laminate. With compression, the conductivity of graphene laminate is increased by more than 50 times compared to that of as-deposited one. Graphene laminate with conductivity of 4.3×104S/m and sheet resistance of 3.8 Ω/sq (with thickness of 6μm) is presented. Moreover, the formation of graphene laminate from graphene ink reported here is simple and can be carried out in low temperature (100°C), significantly reducing the fabrication costs. A dipole antenna based on the highly conductive graphene laminate is further patterned and printed on a normal paper to investigate its RF properties. The performance of the graphene laminate antenna is experimentally measured. The measurement results reveal that graphene laminate antenna can provide practically acceptable return loss, gain, bandwidth, and radiation patterns, making it ideal for low cost printed RF applications, such as RFID tags and wearable wireless sensor networks. © 2015 AIP Publishing LLC.

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