Sensing Application — High-Performance Ni3(HHTP)2 Film-Based Flexible Field-Effect Transistor Gas Sensors

6 measurement groups · 22 results

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

Repeated bending, five-cycle sensing, and 20-day stability tests

Ni3(HHTP)2 film FET sensor on PI · Thin Film

Bending cycle test after 10, 20, 50 and 100 cycles at 57.3 deg; five repeated cycles to 0.2 ppm NO2; long-term response to 0.2 ppm NO2 over 20 days under flat and bent conditions.

Temperature: room temperature
Atmosphere: NO2 in air
Geometry: Flexible PI FET under flat and 57.3 deg bent conditions
Context: Pristine Ni3(HHTP)2 film on PI
Measurement source: S7 · Figure caption · Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Response after 100 bending cycles	no obvious change after 100 bending cycles at 57.3 deg	—	—	Text Qualitative	p005 · Results and Discussion · Figure 5e
Five-cycle repeatability	very tiny sensitivity changes under both flat and bending conditions after 5 cycles	—	—	Text Qualitative	p006 · Results and Discussion · Figure 5f
Long-term stability duration	stable response under flat and bending conditions for 20 days	—	—	Text Qualitative	p006 · Results and Discussion · Figure 5g
SEM morphology after bending cycles	no obvious change; no crack or peeling after bending tests up to 100 cycles	—	—	Text Qualitative	p005 · Results and Discussion · Figure S8 cited

Mixed-gas NO2 anti-interference sensing

Ni3(HHTP)2 film FET sensor on PI · Thin Film

1 ppm NO2 mixed with 5 ppm interference gases; Vds = 0.1 V, Vgs = 0 V, room temperature.

Temperature: room temperature
Atmosphere: NO2 mixed with interference gases in air
Geometry: Flexible Ni3(HHTP)2 FET sensor on PI
Context: Pristine conductive MOF sensing channel
Measurement source: p004 · Results and Discussion · Figure 3e,f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Mixed-gas anti-interference	Responses to 1 ppm NO2 mixed with 5 ppm interferents remain similar to pure NO2	—	—	Text Qualitative	p004 · Results and Discussion · Figure 3e,f

Room-temperature NO2 gas sensing in sealed chamber

Ni3(HHTP)2 film FET sensor on PI · Thin Film

Vds = 0.1 V, Vgs = 0 V, room temperature; pure air baseline, target gas mixed in air, pure air recovery; gas flow rate 1 lpm for primary sensing.

Temperature: room temperature
Atmosphere: NO2 in air
Geometry: Flexible Ni3(HHTP)2 FET sensor on PI
Context: Pristine conductive MOF sensing channel
Measurement source: p004 · Results and Discussion · Figure 3a,b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
NO2 concentration range tested	50 ppb to 10 ppm	—	—	Text Range	p004 · Results and Discussion · Figure 3a
Primary gas flow rate	1 lpm	—	—	Text Exact Reported	p004 · Results and Discussion
NO2 low-concentration calibration equation	S = 205.5C - 2.842 for 0.05-2 ppm	—	—	Text Exact Reported	p004 · Results and Discussion · Equation 1
NO2 limit of detectionMarked as a best value within this paper	56 ppb (S/N > 3)	—	—	Text Rounded Reported	p004 · Results and Discussion · Figure 3b inset
Noise standard deviation in pure air	Navg about 2.84% from 300 data points	—	—	Text Approximate	p004 · Results and Discussion
Sensitivity to 1 ppm NO2Marked as a best value within this paper	up to 215%/ppm	—	—	Text Rounded Reported	p004 · Results and Discussion · Figure 3b
Gas-flow-rate effect on 0.3 ppm NO2 response	0.3, 0.5, 1, 2, and 3 lpm tested; response differences limited, with final responses roughly 58-70% by Figure S6	—	—	Figure Axis Approximate	S6 · Figure caption · Figure S6
Table S1 this-work LOD comparison entry	Ni3(HHTP)2, RT, polyimide/tape/facemask/paper cup/tablecloth/take-out bag substrates, LOD 56 ppb	—	—	SI Table Exact Reported	S9 · Table S1 · Table S1
Table S1 this-work sensitivity comparison entryMarked as a best value within this paper	215/1 (\|%\|/ppm)	—	—	SI Table Exact Reported	S9 · Table S1 · Table S1

NO2 recovery with and without green-light irradiation

Ni3(HHTP)2 film FET sensor on PI · Thin Film

0.2 ppm NO2; Vds = 0.1 V, Vgs = 0 V, room temperature; green light wavelength 532 nm and intensity 57.6 mW/cm2 during recovery.

Temperature: room temperature
Atmosphere: NO2 in air, then air recovery
Geometry: Flexible Ni3(HHTP)2 FET sensor on PI
Context: Pristine conductive MOF sensing channel
Measurement source: p005 · Results and Discussion · Figure 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Green-light intensity	57.6 mW/cm2	—	—	Text Exact Reported	p005 · Results and Discussion · Figure 4
Green-light wavelength	532 nm	—	—	Text Exact Reported	p005 · Results and Discussion · Figure 4
90% recovery time in air	around 66 min	—	—	Text Approximate	p005 · Results and Discussion · Figure 4
Recovery time with green lightMarked as a best value within this paper	30 s	—	—	Text Exact Reported	p005 · Results and Discussion · Figure 4
Blank response under light exposure without target gas	no current response under indoor white light or green light exposure without target gas	—	—	Text Qualitative	p005 · Results and Discussion · Figure S7 cited

Gas selectivity test against inorganic and VOC gases

Ni3(HHTP)2 film FET sensor on PI · Thin Film

Single-gas selectivity at 1 ppm gas; Vds = 0.1 V, Vgs = 0 V, room temperature.

Temperature: room temperature
Atmosphere: Air with 1 ppm target gas
Geometry: Flexible Ni3(HHTP)2 FET sensor on PI
Context: Pristine conductive MOF sensing channel
Measurement source: p004 · Results and Discussion · Figure 3c,d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Responses to 1 ppm non-NO2 gases	triethylamine 3.64%, acetone 3.81%, benzene 4.00%, ethanol 4.39%, formaldehyde 4.63%, H2S 4.72%, N2O 4.96%, SO2 5.14%, CO2 5.64%, NH3/HN3 label 5.85%	—	—	Visual Estimate Approximate	p004 · Figure · Figure 3d
Response to 1 ppm NO2Marked as a best value within this paper	216% from Figure 3d label	—	—	Visual Estimate Approximate	p004 · Figure · Figure 3d

NO2 sensing comparison across flexible substrates

Ni3(HHTP)2 film FET sensor on PI · Thin Film

Ni3(HHTP)2 flexible sensors on PI, tape (PET), paper cup, take-out bag, facemask and tablecloth; flat (0 deg) and bent (57.3 deg) conditions; 2 ppm NO2; Vds = 0.1 V, Vgs = 0 V, room temperature.

Temperature: room temperature
Atmosphere: 2 ppm NO2 in air
Geometry: Flexible FET sensors on six substrates
Context: Pristine Ni3(HHTP)2 films on different substrates
Measurement source: p006 · Results and Discussion · Figure 6a,b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Substrate-dependent 2 ppm NO2 response trend	PI highest (~350-360%), tape next (~310-330%), paper cup (~260-280%), take-out bag (~190-205%), facemask (~145-160%), tablecloth (~140-150%); flat and bent responses close	—	—	Figure Axis Approximate	p006 · Figure · Figure 6a,c