Spectroscopy — Metal-Organic Framework Photoconductivity via Time-Resolved Terahertz Spectroscopy

8 measurement groups · 18 results

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

UV-visible transmission and diffuse-reflection spectroscopy

UV-visible and optical absorption spectroscopy

Zn2TTFTB thin film on FTO · Thin Film

Thin film on FTO used to calculate 400 nm optical penetration length for photoconductivity analysis.

Geometry: Transparent Zn2TTFTB film on FTO
Context: pristine framework film control
Measurement source: S9 · Supplementary Figures · Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Optical penetration length at 400 nm	6.9 um	—	—	Caption Exact Reported	S9 · Supplementary Figures · Figure S8
Diffuse reflection at 400 nm used for penetration-length calculation	8% R	0.08 fraction	—	Caption Exact Reported	S9 · Supplementary Figures · Figure S8
Transmission at 400 nm used for penetration-length calculation	20% T	0.2 fraction	—	Caption Exact Reported	S9 · Supplementary Figures · Figure S8

TRTS/OPTP pump-probe setup

Terahertz spectroscopy

As-prepared Zn2TTFTB tape-cell sample · Powder

400 nm pump from frequency-doubled Ti:sapphire amplifier; THz generated in two-colour air plasma and detected by electro-optical sampling in ZnTe.

Geometry: Pump diameter 8.56 mm 1/e2; probe diameter 1.02 mm 1/e2
Context: as-prepared pristine Zn2TTFTB powder in tape cell
Measurement source: p002 / 9794 · main text

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Normalised pump fluence in probe spot	approximately 16 mJ cm-2	—	—	Text Approximate	p002 / 9794 · main text
Optical pump pulse energy	0.35 mJ	—	—	Text Exact Reported	p002 / 9794 · main text
Optical pump wavelength	400 nm	—	—	Text Exact Reported	p002 / 9794 · main text

THz-TDS refractive-index measurement

Terahertz spectroscopy

Blank tape cell reference · Model

Blank tape cell measured without Zn2TTFTB sample.

Geometry: Tape cell reference
Context: blank model/reference cell
Measurement source: S6 · Supplementary Figures · Figure S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Blank tape-cell refractive index	Flat refractive index across the measurement bandwidth.	—	—	Caption Qualitative	S6 · Supplementary Figures · Figure S3

Spatially resolved THz-TDS transmission line scan

Terahertz spectroscopy

As-prepared Zn2TTFTB tape-cell sample · Powder

Tape reference and two sample locations scanned with micropositioning stage to check sample homogeneity and preparation reproducibility.

Geometry: Pointwise line scan over sample holder
Context: as-prepared pristine Zn2TTFTB powder in tape cell
Measurement source: p002 / 9794 · main text · Figure 2b inset

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Tape-cell THz homogeneity	Two samples showed almost identical THz transmission and no significant variation at their position centre.	—	—	Text Qualitative	p002 / 9794 · main text · Figure 2b inset

THz-TDS and TRTS after hydraulic pressing

Terahertz spectroscopy

Zn2TTFTB tape cell pressed at 11 kbar · Pellet

Tape cell measured after applying 11 kbar pressure.

Geometry: Pressed tape cell
Context: pressure-treated pristine Zn2TTFTB control
Measurement source: p002 / 9794 · main text · Figures S4-S5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Pressure effect on photoconductivity magnitude	Frequency-dependent photoconductivity showed a slight increase in magnitude, particularly from 1.5 to 2.0 THz, ascribed to improved grain-to-grain contact.	—	—	Caption Qualitative	S7 · Supplementary Figures · Figure S5
Frequency range for pressure-related photoconductivity increase, upper bound	1.5 to 2.0 THz	—	range upper bound	Caption Range	S7 · Supplementary Figures · Figure S5
Frequency range for pressure-related photoconductivity increase, lower bound	1.5 to 2.0 THz	—	range lower bound	Caption Range	S7 · Supplementary Figures · Figure S5
Pressure-induced resonance splitting	Applying 11 kbar changed the imaginary refractive index and split the 0.6 THz resonance.	—	—	Text Exact Reported	p002 / 9794 · main text · Figure S4

THz-TDS

Terahertz spectroscopy

Zn2TTFTB pressed PTFE pellet · Pellet

Pressed Zn2TTFTB/PTFE pellet measured after 11 kbar pressure.

Geometry: Pressed PTFE pellet
Context: composite control
Measurement source: S8 · Supplementary Figures · Figure S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
PTFE pellet photoconductivity usability	Pressed Zn2TTFTB/PTFE pellet was not usable for photoconductivity experiments because the PTFE matrix does not transmit the 400 nm excitation pulse.	—	—	Caption Qualitative	S8 · Supplementary Figures · Figure S6
PTFE-pellet resonance shift	Resonant absorption shifted approximately 0.1 THz to lower frequency compared to the tape-cell sample.	—	—	Caption Approximate	S8 · Supplementary Figures · Figure S6

THz time-domain spectroscopy (THz-TDS)

Terahertz spectroscopy

As-prepared Zn2TTFTB tape-cell sample · Powder

Complex frequency-dependent refractive index determined from sample, air reference and tape reference measurements.

Geometry: Tape cell in translation sample holder for micro-positioning
Context: as-prepared pristine Zn2TTFTB powder in tape cell
Measurement source: p002 / 9794 · main text · Figure 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
High-frequency broad absorption onset	Broad absorption beyond 2 THz	—	lower bound	Text Approximate	p002 / 9794 · main text · Figure 2b
Imaginary refractive-index resonance peak	Approximately 0.6 THz	—	—	Text Approximate	p002 / 9794 · main text · Figure 2b
Imaginary refractive-index shoulder	Weaker shoulder at 1.0 THz	—	—	Text Approximate	p002 / 9794 · main text · Figure 2b

Diffuse-reflectance UV-visible spectroscopy

UV-visible and optical absorption spectroscopy

As-synthesised Zn2TTFTB powder · Powder

As-synthesised dark maroon powder measured with a Shimadzu UV-2600 integrating sphere setup.

Context: pristine framework powder
Measurement source: p002 / 9794 · main text · Figure 1b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Visible absorption	Broad absorption throughout the visible region.	—	—	Text Qualitative	p002 / 9794 · main text · Figure 1b