Primary studyCore evidenceTransport Physics

Tunneling Electrical Connection to the Interior of Metal-Organic Frameworks

Han S., Warren S.C., Yoon S.M. et al. · Journal of the American Chemical Society · 2015 · 8169-8175

6materials
9samples
5synthesis routes
17measurements
85results
6claims 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 AgNC tunnelling approach generalises from Rb-CD-MOF single crystals to AgNC@MIL-53 polycrystalline films, though conductivity gains are more moderate due to grain-boundary resistance.

Caveat: MIL-53 films are polycrystalline and anisotropy was not measured.

6 · Results and Discussion · Figure 5 · Linked to 4 structured results

Application RelevanceSupport assessment: Medium

Electrical conductivities above roughly 10^-11 to 10^-5 S/cm are estimated to make electrical losses smaller than mass-transfer losses for representative MOF diffusion coefficients.

Caveat: Authors state these target conductivities are rough estimates and omit drift, convection, geometry and catalyst reaction-rate effects.

3 · Section 2 · Table S1 · Linked to 3 structured results

Composite RoleSupport assessment: High

Adding sparse Ag nanoclusters to otherwise insulating MOFs imparts conductivity and photoconductivity while retaining molecular porosity.

Caveat: High-intensity 1.48 W/cm2 cycling can cause irreversible changes; moderate-intensity cycles below 700 mW/cm2 are described as repeatable.

1 · Abstract · Linked to 4 structured results

Structure Property LinkSupport assessment: High

AgNC-loaded Rb-CD-MOF retains open, accessible pores even at the highest Ag loading because most apparent BET/gas-volume decrease is explained by added Ag mass.

Caveat: Surface area and adsorbed gas volume are normalised per unit mass, so comparison requires the authors mass-correction argument.

9 · Section 4 · Figure S4 · Linked to 3 structured results

Transport MechanismSupport assessment: High

Charge transport in AgNC-loaded MOFs occurs by light-assisted electron tunnelling between spatially separated Ag nanoclusters rather than through a continuous conductive backfill.

Caveat: Model assumes homogeneous AgNC distribution; authors discuss possible large-particle defects and argue they are not transport-dominant.

2 · Results and Discussion · Linked to 4 structured results

Transport MechanismSupport assessment: High

The enhanced conductivity has both direct optical and indirect thermal excitation components.

Caveat: Wavelength-filtered Ar-flow experiment cannot separate light and thermal effects because the highest response coincides with highest temperature.

3 · Results and Discussion · Linked to 4 structured results

Material identities

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

MaterialCompositionStructure contextSource
AgNC@MIL-53Browse family: MIL-53(Al) / Basolite A100Ag nanoclusters in MIL-53(Al)Al-based MIL-53 nodes plus Ag nanoclusters · terephthalate / BDC inferred from MIL-53(Al)3D · CompositeAgNC-loaded MIL-53 with ca. 70% vacant cavity space occupied; crystalline MIL-53 retained by PXRD.6 · Results and Discussion · Figure 5
AgNC@Rb-CD-MOFAg nanoclusters in Rb-CD-MOFRb+ framework plus Ag nanoclusters · gamma-cyclodextrin3D · CompositeAg nanoclusters distributed sparsely in Rb-CD-MOF cavities; framework crystallinity retained after loading.2 · Results and Discussion · Figure 1
AgNC@Rb-CD-MOF percolation modelmodel: Ag particles on bcc Rb-CD-MOF cavity latticemodel Ag particles on Rb-CD-MOF cavities · not applicable3D · Model SystemComputational/percolation model using bcc lattice of 35 x 35 x 35 unit cells with variable site occupancy.13 · Section 9 · Table S3
Generic MOF electron-diffusion target modelmodel; multiple literature MOFsvarious · variousunknown · Model SystemDesign heuristic converting reported molecular diffusion coefficients in MOFs into target electrical conductivities.3-4 · Section 2 · Table S1
MIL-53(Al) (Basolite A100)Browse family: MIL-53(Al) / Basolite A100Al(OH)(BDC), exact formula not reportedAl-based MIL-53 nodes · terephthalate / BDC inferred from MIL-53(Al)3D · PristineCommercial MIL-53 MOF (Basolite A100, Sigma-Aldrich); PXRD used as crystalline control.6 · Results and Discussion · Figure 5
Rb-CD-MOF (rubidium gamma-cyclodextrin MOF)not reportedRb+ / rubidium hydroxide-derived nodes · gamma-cyclodextrin3D · PristineCubic Rb-CD-MOF with ca. 1.7 nm cavities connected by ca. 0.8 nm channels; cavity sites treated as bcc lattice in model.2 · Results and Discussion · Figure 1

Sample register

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

Show 9 sample records
SampleForm and roleProcessing and geometrySource
AgNC@MIL-53 thin-film device on glass with Au electrodesresearch_0037__mat__agnc_mil53Thin Film · Composite Sample · CompositeAgNC@MIL-53 film spread on glass, annealed at 150 C, Au electrodes sputter-deposited around removable Cu wireglass with Au electrodes · electrode gap defined by removed 0.3 mm Cu wire; scale bar 200 um in photograph19 · Section 10 · Figure S12
AgNCs@MIL-53 powder/crystalsresearch_0037__mat__agnc_mil53Powder · Target Sample · Guest LoadedAgNO3 infiltration into activated MIL-53, N2 backfilled, sonicated, shaken, washed, reactivatednone · not reported2 · Section 1 · Experimental Methods
AgNC@Rb-CD-MOF from 10 mM AgNO3research_0037__mat__agnc_rb_cd_mofSingle Crystal · Target Sample · Guest Loadedimmersed in 10 mM AgNO3 in acetonitrile for 48 h; washed with acetonitrile; stored in acetonitrile; degassed under <0.1 mTorr for 48 h prior to conductance measurementsnone · relatively thin crystals (~100 um) used in most conductivity measurements3 · Results and Discussion · Figure 2
AgNC@Rb-CD-MOF from 2 mM AgNO3research_0037__mat__agnc_rb_cd_mofSingle Crystal · Target Sample · Guest Loadedimmersed in 2 mM AgNO3 in acetonitrile for 48 h; washed with acetonitrile; stored in acetonitrile; degassed before measurementnone · not individually reported2 · Results and Discussion · Figure 1
AgNC@Rb-CD-MOF from 5 mM AgNO3research_0037__mat__agnc_rb_cd_mofSingle Crystal · Target Sample · Guest Loadedimmersed in 5 mM AgNO3 in acetonitrile for 48 h; washed with acetonitrile; stored in acetonitrile; degassed before measurementnone · not individually reported2 · Section 1 · Experimental Methods
Ag particles on bcc Rb-CD-MOF cavity lattice modelresearch_0037__mat__agnc_rb_cd_mof_modelModel · Model System · Modelsite occupancy varied computationally; 100 simulations per occupancy valuenot applicable · 35 x 35 x 35 unit-cell bcc lattice13 · Section 9 · Table S3
Generic MOF target-conductivity calculation setresearch_0037__mat__generic_mof_transport_targetModel · Model System · Modeldiffusion coefficients converted to electronic mobility and conductivity using Einstein relationship and sigma = n e munot applicable · not applicable3-4 · Section 2 · Table S1
Blank MIL-53(Al), Basolite A100research_0037__mat__mil53_alPowder · Pristine Control · Pristine Frameworkcommercial MIL-53 activated before Ag loading in related preparationnone · not reported6 · Results and Discussion · Figure 5
Blank Rb-CD-MOF single crystalsresearch_0037__mat__rb_cd_mofSingle Crystal · Pristine Control · Pristine Frameworksolvent exchanged in CH3CN; degassed before electrical measurements where applicablenone · millimeter-sized crystals up to ~1.5 x 1.5 x 1 mm3; thin measurement crystals ca. 100 um when Ag-loaded2 · Section 1 · Experimental Methods