Quantum Interference Engineering of Nanoporous Graphene for Carbon Nanocircuitry

Abstract

Bottom-up prepared carbon nanostructures appear as promising platforms for future carbon-based nanoelectronics, due to their atomically precise and versatile structure. An important breakthrough is the recent preparation of nanoporous graphene (NPG) as an ordered covalent array of graphene nanoribbons (GNRs). Within NPG, the GNRs may be thought of as 1D electronic nanochannels through which electrons preferentially move, highlighting NPG's potential for carbon nanocircuitry. However, the π-conjugated bonds bridging the GNRs give rise to electronic cross-talk between the individual 1D channels, leading to spatially dispersing electronic currents. Here, we propose a chemical design of the bridges resulting in destructive quantum interference, which blocks the cross-talk between GNRs in NPG, electronically isolating them. Our multiscale calculations reveal that injected currents can remain confined within a single, 0.7 nm wide, GNR channel for distances as long as 100 nm. The concepts developed in this work thus provide an important ingredient for the quantum design of future carbon nanocircuitry. *

Thermoelectric Performance Enhanced by Destructive Quantum Interference in Nanoporous Carbon Nanotube Based Junctions

“…To present the structures more clearly, the meta-CNT and para-CNT are unfolded along the Z axis to form nanoribbon structures, as shown in Figure 1c,d. The QI-based graphene nanoribbon structures have already been synthesized by Calogero et al, [55] indicating that the QI-based NCNT is expected to be synthesized in experiments. The calculated electron transmission properties of perfect-CNT, meta-CNT, and para-CNT devices are shown in Figure 2.…”

All-carbon approach to inducing electrical and optical anisotropy in graphene

“…For the NPGs, all fall within the trend of the GNRs. We note that the meta-and para-NPGs show little difference in the anisotropy they induce in graphene, despite their significantly different transport properties in isolation 36 . Finally, the NPG-8 and NPG-10 structures fall on the other side of the optimal width/band gap.…”

“…Specifically, we consider two other configurations of NPG that were studied in Ref. 36. These structures are the same as that in Fig.…”

Efectos de forma y tamaño del poro sobre las propiedades mecánicas de las membranas del grafeno nanoporoso

“…For this reason, researchers have been finding a wide variety of applications such as in nanoelectronics [4,5], energy storage [6,7], water purification [8] and as coated composite materials [9]. In addition to these applications, the nanoporous graphene (NPG) membranes promise great utility in seawater desalination [10,11], carbon dioxide separation [12][13][14] and the nanoribbons of NPG may be thought of as unidimensional channels for electronic applications (nanocircuity), i.e., for directing electrons through predesigned paths via nanoporous [15]. In this scenario, previous studies have reported that permeability of the NPG membrane is approximately three orders of magnitude greater than the latest generation (commercial) reverse osmosis, where salt ions are rejected at 100 % [10].…”