Negative differential resistance in graphene-based ballistic field-effect transistor with oblique top gate

Liquid Exfoliated Graphene: A Practical Method for Increasing Loading and Producing Thin Films

“…4 OH added to the select dispersions was 7.5% of the total volume and the addition occurred prior to sonication unless otherwise stated. Graphite flakes, +100 mesh, were then loaded into 60mL of each solvent at a concentration of 75g/L.…”

“…Centrifugation, at appropriate rates, precipitates the heavier layers and can preserve predominantly single layered graphene within the dispersion, though some multilayered graphene, <5 layers, may persist. [19][20][21][22] This publication reports the inclusion of ammonium hydroxide {NH 4 OH} within the liquid exfoliation process to increase graphene loadings. The inclusion of ammonia {NH 3 } within dispersions has most notably been reported for graphene oxide reduction 23 as a means of preventing sheet aggregation during reduction with hydrazine {N 2 H 4 }.…”

“…The inclusion of ammonia {NH 3 } within dispersions has most notably been reported for graphene oxide reduction 23 as a means of preventing sheet aggregation during reduction with hydrazine {N 2 H 4 }. The addition of {NH 4 OH} provides a facile means of including NH 3 in order to prevent aggregation of liquid exfoliated graphene, increase graphene loading and improve dispersion stability. Dripping the highly loaded graphene dispersions into water is demonstrated as a simple method of graphene film formation and provides a qualitative means of comparing dispersion concentrations.…”

A tunable microwave slot antenna based on graphene

“…The paper shows that the reflection parameter of the antenna can be tuned by a DC voltage. 2D radiation patterns at various frequencies in the X band (8)(9)(10)(11)(12) are then presented using as antenna backside a microwave absorbent and a metalized surface. Although the radiation efficiency is lower than a metallic antenna, the graphene antenna is a wideband antenna while the metal antennas with the same geometry and working at the same frequencies are narrowband.…”

“…Few examples are graphene field-effect transistors (FETs) with f max ¼ 70 GHz, 7 graphene FETs with cutoff frequencies in the THz range, 8,9 microwave and millimeter wave generation via multiplication, 10 even graphene receivers at microwave frequencies, 11,12 and THz frequencies. 13,14 The antennas are key components in any wireless communication system.…”