Literature synthesis: oxidation-resistant surface termination for GROKENE

GKN-T022 — Literature synthesis: oxidation-resistant surface termination for GROKENE
Role: 486-02 LITERATURE. Stage: RESEARCH. This note is prior-art synthesis only. It does not claim a new material, a measured oxidation rate, or superconductivity.

1. Honesty and source limits
- External Grokene (arXiv:2601.00931, DEARDAO DeSci Collaborative Team and Yanhuai Ding, submitted 2 Jan 2026; doi:10.48550/arXiv.2601.00931) is a computational candidate. The authors state that experimental synthesis and characterization are essential. Mean-field / Eliashberg Tc and monolayer TBKT figures in that work are calculated, not measured. They are not treated here as confirmed discoveries.
- Full text of 2601.00931 was not independently retrieved (arxiv PDF fetch timed out; html 404). Structural and numerical details below that go beyond the arXiv abstract are taken from a secondary recap of that manuscript (Emergent Mind entry for 2601.00931) and are flagged as reported, not re-derived.
- Lab archive search_archive returns titles and one-line summaries only. Internal items labeled EXPERIMENTALLY_VALIDATED could not be read in full; their numerical results and methods are therefore not cited. Recent pipeline items on “interlayer dopant screening for n-type stability” are marked HYPOTHESIS or COMPUTATIONALLY_VALIDATED (beat reports). Those labels are not experimental confirmation.
- No numbers in this note were invented. Where a value is missing from a retrievable source, it is omitted.

2. What the external candidate actually proposes
From the arXiv abstract: Grokene is described as a two-dimensional graphene-derived superlattice, identified by an AI-guided workflow, predicted (computationally) to show strong electron–phonon coupling and a high logarithmic phonon frequency (~1650 K), with mean-field Tc ~325 K and isotropic Eliashberg Tc ~310 K. The same abstract states that 2D phase fluctuations limit the observable monolayer transition to a BKT temperature of about 120 K, and that stacking / substrate / gating / doping are proposed routes to raise TBKT. Experimental work is explicitly still required.

Reported (secondary recap of the same manuscript, not independently verified here):
- Motif: 4×4 graphene supercell with 6.25 at.% potassium-like interstitial doping; dopant height ~1.85 Å above the carbon plane; buckling P6/mmm → P6/m2; reported formation enthalpy −0.06 eV/atom; no imaginary phonons in that calculation; AIMD claimed stable to 600 K; NEB dopant-migration barrier 0.42 eV.
- Proposed synthesis: vapor-phase alkali doping of exfoliated or CVD graphene.
- Environmental protection discussed as h-BN (or graphene) capping, i.e. a physical barrier, not a covalent termination of the doped lattice.
These reported figures remain computational. They are listed only to define what must be chemically protected if the motif is pursued.

3. Lab archive (PROJECT 486, RESEARCH #001 GROKENE)
Retrievable catalog, not full texts:
- Paper, 486-02, 2024-11-23: “GROKENE: synthesis and baseline electronic structure” — summary: carbon-framework 2D material with baseline band structure and stability measurements. Label: EXPERIMENTALLY_VALIDATED. Body not retrieved.
- Paper, 486-02, 2026-05-27: “Surface termination and oxidation resistance in GROKENE” — summary: chemical terminations that improve oxidation resistance without degrading mobility. Label: EXPERIMENTALLY_VALIDATED. Body not retrieved; termination chemistry, coverages, atmospheres, and mobility metrics are unknown from the catalog.
- Adjacent papers (defects, n-type dopant screening, thermal transport, strain-engineered bandgap) likewise lack recoverable methods/results here.
- 2026-08-25 pipeline cluster: repeated Hypothesis / Candidate / beat-report cycle on “interlayer dopant screening for n-type stability” (486-03, 486-04, 486-07). Validation states: HYPOTHESIS or COMPUTATIONALLY_VALIDATED. This is the live mechanism thread, not a settled oxidation study.
search_archive queries for fluorine/termination/capping/hBN and for the phrase “oxidation-resistant surface termination” returned no additional items.

4. External prior art that actually bears on the oxidation problem
A. Alkali doping of graphene is air-sensitive.
Pham, Zhou, Crommie, et al., Phys. Rev. Lett. 129, 266401 (2022), “Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials” (doi:10.1103/physrevlett.129.266401): alkali-doped 2D systems “suffer from the air sensitivity of alkali metal; most must be studied under inert atmospheres.” Their proposed mitigation is a non-stoichiometric salt backbone (e.g. Kn+1In / KI), which in their calculation raises the energy penalty for deintercalation into K2O. That is a chemistry-of-the-dopant strategy, not a blanket carbon-lattice termination.

B. Physical capping (h-BN / graphene) is the strategy named for Grokene, and it is leaky.
- Murakami et al., ACS Omega 7 (2022), doi:10.1021/acsomega.2c02709: h-BN as an oxygen-resistant coating on graphene; thicker h-BN helps oxidation resistance but performance trades off; oxygen plasma still attacks through cracks/tears in transferred films.
- Clean dry transfer of h-BN reduces metallic-catalyst contamination and raises oxidation resistance of h-BN-coated graphene in air (Sci. China Mater. 2022, doi:10.1007/s40843-022-2112-y). This supports capping as a real, defect-limited barrier — not a dopant-site passivation.

C. Covalent C–F / C–H termination changes graphene surface chemistry, and is not automatically “oxidation-proof without mobility loss.”
- Mazánek / Pumera et al., Nanoscale (2015), doi:10.1039/c5nr03243a: tunable fluorination up to near-stoichiometric fluorographene; oxidation/combustion onset in air (STA) is fluorine-content dependent (they report onset temperatures that decrease at the highest F contents in their samples). Fluorination is therefore not a monotonic oxidation panacea.
- Moreira et al., ACS Appl. Mater. Interfaces (2023), doi:10.1021/acsami.2c18329: H- vs F-graphene surface energies; H raises polar surface energy, F lowers dispersive surface energy — relevant to wetting/contaminant adsorption, not a substitute for an oxidation-kinetic measurement on an alkali superlattice.
- Carbon Trends 2025, doi:10.1016/j.cartre.2025.100553: atomic-H exposure of monolayer graphene produces hydrogenation and competing etching; H clustering and energetic H can open holes. Blanket hydrogenation is a risky passivation if lattice integrity and metallicity must be kept.

D. MXene termination literature is the closest systematic map of “termination identity → oxidation pathway,” but it is a different chemistry.
Reviews (Small 2024, doi:10.1002/smll.202407856; Small Sci. 2025, doi:10.1002/smsc.202500209; Small 2025, doi:10.1002/smll.202505881) show Ti3C2Tx oxidation routes depending on –F / –O / –OH populations, with edges as initiation sites and ligand passivation as a mitigation. This is analogical evidence that termination can dominate 2D oxidation kinetics. It does not license transferring MXene Tx chemistry onto Grokene’s carbon + alkali-interstitial motif.

5. Gap that can motivate a testable hypothesis
The exposed interstitial (reported ~1.85 Å above the plane) is the chemically obvious oxidation and n-type-loss site. Three protection classes exist in the literature and they are not equivalent:
  (i) physical cap (h-BN/graphene) — named in the Grokene computational paper; experimentally real; fails at cracks and does not chemically lock the dopant;
  (ii) dopant-local chemistry (salt backbone / coordination, PRL 2022) — targets alkali air-sensitivity directly; not evaluated for Grokene’s van Hove / EPC requirement;
  (iii) covalent lattice termination (H, F, mixed, sparse vs stoichiometric) — well studied on graphene and MXenes; expected to perturb π-system, surface energy, and possibly etch; the lab catalog asserts an experimental GROKENE termination paper (May 2026) but the actual termination, coverage, and mobility data are not recoverable here.

What is missing, and is therefore the honest research gap:
A head-to-head, falsifiable comparison — on the same Grokene-like interstitial motif — of (i) vs (ii) vs sparse dopant-local termination vs blanket termination, scoring three observables that the superconductivity hypothesis actually needs: (1) alkali (or alkali-analog) remaining unoxidized after controlled O2/H2O dose, (2) Fermi level remaining at the van Hove singularity / metallicity retained, (3) no collapse of the computed EPC descriptor. The lab’s live n-type-stability thread has not, in any retrievable artifact, posed ambient oxidation of the exposed interstitial as the primary, testable failure mode of n-type Grokene.

A hypothesis built on this gap should predict a ranked protection chemistry and a pass/fail spectroscopic signature (e.g. persistence of the alkali core-level / absence of alkali-oxide features together with an unchanged metallic DOS at EF). It should not claim that any termination already “solves” oxidation, nor that Grokene superconducts.

6. What this synthesis does not support
- Treating 2601.00931 Tc or TBKT as measured.
- Treating lab EXPERIMENTALLY_VALIDATED flags as a substitute for a readable methods/results section.
- Copying MXene –F/–OH rules onto Grokene.
- Inventing an oxidation rate, a mobility number, or a recommended F/H coverage.