Electrical Transport — Promoting electromagnetic wave absorption for conductive metal-organic frameworks through crystal morphology controlling

8 measurement groups · 30 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

Attenuation constant calculated from electromagnetic parameters

Ni-TABQ cMOFs, jointly reported samples · Powder

Attenuation constant alpha calculated from dielectric constant and permeability over 2-18 GHz.

Context: Ni-TABQ/paraffin absorber rings
Measurement source: SI p.4 · 3. Attenuation Constant · Fig. S5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-TABQ-1 attenuation constant near 18 GHzMarked as a best value within this paper	approximately 210 at 18 GHz	—	—	Visual Estimate Uncertain	SI p.4 · 3. Attenuation Constant · Fig. S5
Ni-TABQ-2 attenuation constant near 18 GHz	approximately 50 at 18 GHz	—	—	Visual Estimate Uncertain	SI p.4 · 3. Attenuation Constant · Fig. S5

Debye/Cole-Cole dielectric-loss analysis

Ni-TABQ cMOFs, jointly reported samples · Powder

Cole-Cole curves plus conduction and polarisation loss separation from epsilon prime and epsilon double-prime.

Context: Ni-TABQ/paraffin absorber rings
Measurement source: SI p.5 · 4. Debey Theory · Fig. S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Conduction-loss evidence	straight line extending to upper right at end of Cole-Cole curve	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. S6a-b
Debye relaxation evidence	at least one semicircle appears in all Ni-TABQ cMOFs	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. S6a-b
Dominant dielectric-loss component	polarization loss plays a major role	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. S6c-d

Four-point probe conductivity measurement

Electrical conductivity

Ni-TABQ-1 black crystalline powder · Powder

Conductivity of as-prepared Ni-TABQ-1 sample.

Geometry: four-point probe
Context: pristine Ni-TABQ-1 powder
Measurement source: main p.4 / journal p.11528 · Results and discussion · Fig. 4d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Electrical conductivityMarked as a best value within this paper	1.6 x 10^-2 S cm^-1	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4d

Four-point probe conductivity measurement

Electrical conductivity

Ni-TABQ-2 black powder · Powder

Conductivity of as-prepared Ni-TABQ-2 sample.

Geometry: four-point probe
Context: pristine Ni-TABQ-2 powder
Measurement source: main p.4 / journal p.11528 · Results and discussion · Fig. 4d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Electrical conductivity	3.0 x 10^-4 S cm^-1	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4d

Impedance matching analysis from VNA-derived parameters

Ni-TABQ-1/paraffin coaxial absorber ring · Pellet

Evaluation of |Zin/Z0| versus frequency and absorber thickness using transmission-line model.

Context: composite absorber ring
Measurement source: main p.5 / journal p.11529 · Results and discussion · Fig. S4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Impedance matching at 2.94 mm	\|Zin/Z0\| closest to 1	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. S4c-d

Quarter-wavelength matching model

Ni-TABQ-1/paraffin coaxial absorber ring · Pellet

Correlation between matching thickness and RL peak frequency for Ni-TABQ-1 absorber.

Context: Ni-TABQ-1/paraffin absorber ring
Measurement source: SI p.6 · 6. Quarter Wavelength Matching Model · Fig. S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Quarter-wavelength match	experimental thickness of optimal RLmin is consistent with theoretical thickness	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. S7

Vector network analyser electromagnetic parameter measurement (Agilent PNA-N5244A)

Ni-TABQ-1/paraffin coaxial absorber ring · Pellet

Ni-TABQ-1/paraffin 4:6 coaxial ring; epsilon_r and mu_r measured at 2-18 GHz; RL calculated by transmission-line theory.

Geometry: coaxial ring, outer diameter 7.0 mm and inner diameter 3.04 mm
Context: composite absorber ring with pristine cMOF component
Measurement source: main p.2 / journal p.11526 · Characterization · Fig. 4a-e; Fig. S3-S4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Dominant EMW attenuation mechanism	dielectric loss dominates over magnetic loss	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. 4c; Fig. S3c
EAB upper frequency	15.36 GHz	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e
Effective absorption bandwidthMarked as a best value within this paper	5.12 GHz	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e; Table S1
EAB lower frequency	10.24 GHz	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e
Absorber thickness at EAB	2.50 mm	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e
Ni-TABQ-1 epsilon prime at high-frequency end	5.7 at approximately 18 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4a
Ni-TABQ-1 epsilon prime at low-frequency end	10.66 at approximately 2 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4a
Ni-TABQ-1 epsilon double-prime at high-frequency end	2.79 at approximately 18 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4b
Ni-TABQ-1 epsilon double-prime at low-frequency end	4.17 at approximately 2 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4b
Relative permeability imaginary part	mu'' values remain at 0	—	—	Text Rounded Reported	main p.4 / journal p.11528 · Results and discussion · Fig. S3a-b
Relative permeability real part	mu' values remain at 1	—	—	Text Rounded Reported	main p.4 / journal p.11528 · Results and discussion · Fig. S3a-b
Frequency at RLmin	10.16 GHz	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e
Minimum reflection lossMarked as a best value within this paper	-62.68 dB	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e; Fig. S4a
Absorber thickness at RLmin	2.94 mm	—	—	Text Exact Reported	main p.5 / journal p.11529 · Results and discussion · Fig. 4e
Table S1 absorber thickness	2.94 mm	—	—	SI Table Exact Reported	SI p.7 · Table S1 · Table S1
Loading in paraffin absorber	40 wt%	—	—	SI Table Exact Reported	SI p.7 · Table S1 · Table S1

Vector network analyser electromagnetic parameter measurement (Agilent PNA-N5244A)

Ni-TABQ-2/paraffin coaxial absorber ring · Pellet

Ni-TABQ-2/paraffin 4:6 coaxial ring; epsilon_r and mu_r measured at 2-18 GHz; RL calculated by transmission-line theory.

Geometry: coaxial ring, outer diameter 7.0 mm and inner diameter 3.04 mm
Context: composite absorber ring with pristine cMOF component
Measurement source: main p.2 / journal p.11526 · Characterization · Fig. 4a-f; Fig. S3-S4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-TABQ-2 epsilon prime at high-frequency end	3.99 at approximately 18 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4a
Ni-TABQ-2 epsilon prime at low-frequency end	4.85 at approximately 2 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4a
Ni-TABQ-2 epsilon double-prime at high-frequency end	0.57 at approximately 18 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4b
Ni-TABQ-2 epsilon double-prime at low-frequency end	1.3 at approximately 2 GHz	—	—	Text Exact Reported	main p.4 / journal p.11528 · Results and discussion · Fig. 4b
Reflection loss over 2-18 GHz	RL greater than -10 dB	—	—	Text Qualitative	main p.5 / journal p.11529 · Results and discussion · Fig. 4f