Sensing Application — Underpinning the conductivity mechanism in wide bandgap metal organic framework through chemical sensing

3 measurement groups · 20 results

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

Conductometric gas sensing response to ammonia

50-50 Zn:Co ZIF conductometric gas sensor device · Electrode

Sensor devices exposed to ammonia at 180 deg C; response calculated as Delta R/R.

Temperature: 453.15
Atmosphere: ammonia in flowing air / balance gases as described in SI
Geometry: drop-cast films on Au interdigitated electrodes
Context: Comparison of ZIF-8, ZIF-67, and 50-50 Zn:Co sensors.
Measurement source: p005-p006 · Gas sensing studies · Fig. 5(a,b); Fig. S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
50-50 Zn/Co ZIF ammonia response at 16000 ppm and 180 deg C	approximately 1.5% response	—	visual estimate at 16000 ppm from plotted response curve	Figure Axis Approximate	p010 · Additional data of Gas sensing measurements · Fig. S6
ZIF-67 ammonia response at 2000 ppm and 180 deg C	approximately 1.0% response	—	visual estimate at 2000 ppm from plotted response curve	Figure Axis Approximate	p010 · Additional data of Gas sensing measurements · Fig. S6
ZIF-8 ammonia response at 40000 ppm and 180 deg CMarked as a best value within this paper	approximately 100% response	—	visual estimate at 40000 ppm from plotted response curve	Figure Axis Approximate	p010 · Additional data of Gas sensing measurements · Fig. S6
50-50 Zn/Co ZIF ammonia response at 20000 ppm and 180 deg C	approximately 4-5% response	—	visual estimate at 20000 ppm from plotted response curve	Figure Axis Approximate	p006 · Gas sensing studies · Fig. 5(b)
Room-temperature gas response	No response observed for gases at room temperature	—	—	Text Qualitative	p005 · Gas sensing studies
Gas-sensing operating temperature	180 deg C	453.15 K	—	Text Exact Reported	p005 · Gas sensing studies · Fig. 5(b); Fig. S6; Fig. S7
Baseline resistance ordering in dynamic response curves	R_ZIF-67 < R_Mix < R_ZIF-8	—	—	Text Qualitative	p005 · Gas sensing studies · Fig. 5(a)
ZIF-67 ammonia response at 20000 ppm and 180 deg C	approximately 3% response	—	visual estimate at 20000 ppm from plotted response curve	Figure Axis Approximate	p006 · Gas sensing studies · Fig. 5(b)
ZIF-8 ammonia response at 20000 ppm and 180 deg CMarked as a best value within this paper	approximately 45-50% response	—	visual estimate at 20000 ppm from plotted response curve	Figure Axis Approximate	p006 · Gas sensing studies · Fig. 5(b)

Conductometric cross-sensitivity comparison for ammonia, hydrogen, and hexane

50-50 Zn:Co ZIF conductometric gas sensor device · Electrode

ZIF-8, ZIF-67, and 50-50 mixture exposed to ammonia, hydrogen, and hexane at 180 deg C.

Temperature: 453.15
Atmosphere: NH3, H2, hexane in flowing air/background gases
Geometry: drop-cast films on Au interdigitated electrodes
Context: Comparison of Zn, Co, and mixed-metal ZIF sensors.
Measurement source: p005-p006 · Gas sensing studies · Fig. 5(c); Fig. S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
50-50 Zn/Co ZIF gas response scope	Mixture can sense ammonia, hydrogen, and hexane at 180 deg C, but ammonia response is drastically low.	—	—	Text Qualitative	p005 · Gas sensing studies · Fig. 5(c)
ZIF-67 cross-sensitivity pattern	ZIF-67 lacks ammonia selectivity; measurable response to hydrogen and no resistance change for hexane.	—	—	Text Qualitative	p005 · Gas sensing studies · Fig. 5(c); Fig. S7
ZIF-8 selectivity patternMarked as a best value within this paper	ZIF-8 showed minimal response toward hydrogen and hexane compared with ammonia; very low but measurable response to hexane and no hydrogen response.	—	—	Text Qualitative	p005 · Gas sensing studies · Fig. 5(c); Fig. S7
50-50 mixture hydrogen response at 2000 ppm	approximately 0.65% response	—	visual estimate from SI Fig. S7(c)	Figure Axis Approximate	p011 · Additional data of Gas sensing measurements · Fig. S7(c)
50-50 mixture hexane response at 35000 ppm	approximately -1.0% response	—	visual estimate from SI Fig. S7(c)	Figure Axis Approximate	p011 · Additional data of Gas sensing measurements · Fig. S7(c)
ZIF-67 hydrogen response at 2000 ppm	approximately 1.5% response	—	visual estimate from SI Fig. S7(a)	Figure Axis Approximate	p011 · Additional data of Gas sensing measurements · Fig. S7(a)
ZIF-8 hexane response at 35000 ppm	approximately -0.16% response	—	visual estimate from SI Fig. S7(b)	Figure Axis Approximate	p011 · Additional data of Gas sensing measurements · Fig. S7(b)

Gas-sensing device and flow setup

50-50 Zn:Co ZIF conductometric gas sensor device · Electrode

Resistance measured in flowing air/test gas; 500 SCCM total flow; 10% NH3 in N2, 1% H2 diluted with air, hexane generated from bubbler; two-probe Keithley 6517B electrometer; Linkam P600E chamber about 100 mL.

Temperature: 453
Atmosphere: flowing air/test gases
Geometry: drop-cast MOF films on Au interdigitated ceramic devices
Context: Applies to all three conductometric sensors.
Measurement source: p002 · Details of sensor device fabrication and gas sensing measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Sensor chamber volume	about 100 ml	—	—	Text Approximate	p002 · Details of sensor device fabrication and gas sensing measurements
Drop-cast device drying time	about an hour	—	—	Text Approximate	p002 · Details of sensor device fabrication and gas sensing measurements
Total gas flow rate	500 SCCM	—	—	Text Exact Reported	p002 · Details of sensor device fabrication and gas sensing measurements
Sensor substrate size	1 x 1 cm2	—	—	Text Exact Reported	p002 · Details of sensor device fabrication and gas sensing measurements