Primary studyCore evidenceThin Film Device

Dirac-cone induced metallic conductivity in Cu3(HHTP)2: high-quality MOF thin films fabricated via ML-driven robotic synthesis

Scheiger C., Pohls J.F., Mostaghimi M. et al. · Materials Horizons · 2025 · 6189-6194

3materials
9samples
2synthesis routes
13measurements
31results
5claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: High

The optimised Cu3(HHTP)2 SURMOF is reported as the first MOF thin film exhibiting metallic electrical transport.

Caveat: The claim is the authors' novelty statement; database confidence refers to extraction fidelity, not independent novelty verification.

p005 / 6193 · Conclusion · Linked to 4 structured results

CaveatSupport assessment: Medium

UPS data do not support a ca. 100 meV band gap, which conflicts with an intrinsic semiconductor interpretation from long-channel activated transport.

Caveat: UPS figure values are read from labelled plot annotations; the absence of a gap is a qualitative interpretation.

p003 / 6191 · Results · Fig. S8 · Linked to 3 structured results

Structure Property LinkSupport assessment: High

DFT assigns the metallic behaviour to a symmetry-related Dirac cone in the D6h Cu3(HHTP)2 sheets, with remnants persisting in the ABAB-stacked bulk.

Caveat: Computational mechanism; experimental support comes from conductivity trend and UPS rather than direct band imaging.

p004 / 6192 · Results · Fig. 3 · Linked to 3 structured results

Synthesis MechanismSupport assessment: Medium

Visible-region UV-vis absorption, especially 575-625 nm, is used as a surrogate for improved coordination, reduced defects, and higher conductivity in the ML optimisation.

Caveat: The UV-vis/conductivity relationship is proposed and supported by calculations and trends, not by a tabulated quantitative correlation coefficient.

p003 / 6191 · Results · Fig. 1 and Fig. S2 · Linked to 4 structured results

Transport MechanismSupport assessment: High

The lower and activated long-channel conductivity is attributed to electron transport across domain boundaries, while 100 nm contacts probe intrinsic intra-domain metallic behaviour.

Caveat: Domain-size value is approximate and inferred from FWHM analysis reported in text.

p004 / 6192 · Results · Fig. 2 and Fig. 4 · Linked to 4 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
Co3(HHTP)2 modelBrowse family: Co₃(HHTP)₂ / Co–HHTPCo3(HHTP)2Co nodes in 2D HHTP framework · HHTP2D · Model SystemFully relaxed 2D high-spin computational model used for band-structure comparison.p008 / SI page 8 · Band Structure Calculations · Figure 9
Cu3(HHTP)2Browse family: Cu₃(HHTP)₂ / Cu–HHTPCu3(HHTP)2 / Cu3HHTP2Cu2+ secondary building units · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP)2D · PristineConductive MOF composed of conjugated two-dimensional honeycomb monolayers; AB stacking in bilayer and ABAB stacking in bulk; channels along [001].p002 / 6190 · Introduction · Fig. 1
Ni3(HHTP)2 modelBrowse family: Ni₃(HHTP)₂ / Ni–HHTPNi3(HHTP)2Ni nodes in 2D HHTP framework · HHTP2D · Model SystemFully relaxed 2D high-spin computational model used for band-structure comparison.p008 / SI page 8 · Band Structure Calculations · Figure 8

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 9 sample records
SampleForm and roleProcessing and geometrySource
Co3(HHTP)2 2D computational modelresearch_0417__mat__mat_co_hhtp2_modelModel · Model System · ModelDFT high-spin model2D modelp008 / SI page 8 · Band Structure Calculations · Figure 9
Cu3(HHTP)2 bulk computational modelresearch_0417__mat__mat_cu_hhtp2Model · Model System · ModelDFT high-spin bulk model3D ABAB stacked modelp007 / SI page 7 · Band Structure Calculations · Figure 6
Cu3(HHTP)2 monolayer computational modelresearch_0417__mat__mat_cu_hhtp2Model · Model System · ModelDFT high-spin monolayer model with D6h symmetrysingle plane / monolayerp004 / 6192 · Results · Fig. 3
Cu3(HHTP)2 SURMOF with 100 nm lithographic 4-terminal contactsresearch_0417__mat__mat_cu_hhtp2Thin Film · Target Sample · Pristine FrameworkOptimised SURMOF processed by PMMA electron-beam lithography, Cr/Au contact evaporation and lift-offSiO2/Si · 650 nm for short-channel electron-beam lithography samplep005 / SI Experimental 2.3 · Conductivity measurement · Fig. 4, Fig. S6, Fig. S7
Cu3(HHTP)2 SURMOF with 100 um shadow-mask Au contact spacingresearch_0417__mat__mat_cu_hhtp2Thin Film · Target Sample · Pristine FrameworkOptimised SURMOF contacted with 45 nm Au pads evaporated through a shadow maskSiO2/Si · 620 nm for long-channel shadow mask samplep005 / SI Experimental 2.3 · Conductivity measurement · Fig. S4 and Fig. S5
Cu3(HHTP)2 SURMOF with 15 um contact spacingresearch_0417__mat__mat_cu_hhtp2Thin Film · Target Sample · Pristine FrameworkOptimised SURMOF measured with reduced electrode spacingSiO2/Si · not separately reported; long-channel familyp010 / SI Fig. S5 · Figure captions · Figure S5
Non-optimised Cu3(HHTP)2 SURMOFresearch_0417__mat__mat_cu_hhtp2Thin Film · Pristine Control · Pristine FrameworkInitial, non-optimised deposition conditionnot specifiedp008 / SI Fig. S2 · Figure captions · Figure S2
Optimised Cu3(HHTP)2 SURMOF thin filmresearch_0417__mat__mat_cu_hhtp2Thin Film · Target Sample · Pristine FrameworkML-optimised robotic layer-by-layer SURMOF grown in nitrogen gloveboxSiO2/Si substrate unless otherwise specified · around 600 nm; SEM 602 +/- 74 nm; AFM glass sample 648 +/- 67 nmp003 / 6191 · Results · Table S1 and Fig. S1 referenced
Ni3(HHTP)2 2D computational modelresearch_0417__mat__mat_ni_hhtp2_modelModel · Model System · ModelDFT high-spin model2D modelp008 / SI page 8 · Band Structure Calculations · Figure 8