Summary
The current research literature uses graphene in four distinct roles. First, as an electronic substrate and support: graphene-supported dual-atom catalysts for water splitting, where the carbon/nitrogen coordination around the metal pair is the design variable, and graphene on Ir(111) as a growth template for molecular beam epitaxy of MoS2. Second, as an active optoelectronic layer, for example dual-layer graphene electro-optic phase modulators on silicon nitride waveguides for cryogenic photonic quantum processors. Third, as a correlated-electron platform: rhombohedral and twisted graphene stacks where flat bands and Berry curvature set the size of Cooper pairs and where moiré superlattices host Brown-Zak fermions detectable in nonlinear Hall oscillations from fields as low as 0.5 T. Fourth, as a passive surface or filler: a coating that reduces rarefied-air drag and an additive that refines magnesium grain structure for hydrogen storage.
The parameters that decide outcomes differ by role. For devices it is fabrication: sub-10 nm nanoribbon FETs have been written by AC-bias electrochemical AFM lithography, but the authors state plainly that integration into conventional transistor technology remains hindered by high fabrication costs and complex processing. For heterostructures it is the twist angle: 0 degree WS2-graphene stacks show efficient charge separation under 3.1 eV excitation, while at 30 degrees electron and hole transfer proceed at similar rates, cancelling the useful asymmetry. For photonics it is graphene quality alongside waveguide geometry and spacer permittivity. For coatings it is defect density and corrugation, which raise momentum accommodation, though graphene reportedly holds up at experimentally relevant defect densities.
Evidence base
Open questions
- Can the sub-10 nm graphene nanoribbon FETs written by AC electrochemical AFM lithography be produced at more than one device at a time, and what is the device-to-device variation in band gap and on/off ratio?
- Do the 24 graphene-supported dual-atom catalysts identified by constant-potential DFT screening survive synthesis and show the predicted bifunctional activity and stability in an operating electrolyser?
- What drag coefficient or orbital lifetime change does the simulated reduction in tangential momentum accommodation translate into for a real coated surface, and does the coating survive atomic oxygen and thermal cycling?
- Is wafer-scale twist-angle control to within the tolerance that distinguishes 0 degree from 30 degree charge-separation behaviour in WS2-graphene achievable outside epitaxial growth on selected substrates?
Assessment drafted 2026-08-31 from up to 18 KB sources using the technology-scorecard framework; scores are a draft read pending review.