Sensing Application — Chemiresistive and chem-FET Sensor: π-d conjugated metal-organic framework for ultra-sensitive and selective carbon monoxide detection

7 measurement groups · 30 results

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

Chemiresistive calibration and LOD analysis

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

Linear response fitted for CO concentration; LOD estimated by linear regression treatment

Temperature: 301
Atmosphere: 30% RH
Geometry: Zn-HHTP on IDE
Context: pristine Zn-HHTP sensor device
Measurement source: 4 · 4.1. Gas sensor fabrication and measurement · Fig. 4c,d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Chemiresistive calculated LODMarked as a best value within this paper	3.96 ppm	—	—	Text Exact Reported	5 · 4.1. Gas sensor fabrication and measurement · Eq. 3-4; Fig. 4d inset
Chemiresistive CO linear fit equation	Y = -1.56667 + 0.32885X	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement · Eq. 2
Chemiresistive CO calibration R2Marked as a best value within this paper	R2 = 0.9928	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4c
Chemiresistive NH3 calibration R2	R2 = 0.93685	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4c
Chemiresistive SO2 calibration R2	R2 = 0.9662	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4c
Chemiresistive experimental lower detection limit	10 ppm	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4a,c

Dynamic chemiresistive gas sensing

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

CO, NH3 and SO2 gases; 10-100 ppm; room temperature 28 C; 30% relative humidity; dry air/analyte flow controlled by MFCs; Keithley-4200A SPA

Temperature: 301
Atmosphere: dry air/analyte, 30% RH
Geometry: Zn-HHTP on IDE, 3 um gap; chamber approximately 15 cm3
Context: pristine Zn-HHTP sensor device
Measurement source: 4 · 4.1. Gas sensor fabrication and measurement · Fig. 4a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Chemiresistive CO concentration range maximum	10 to 100 ppm	—	range	Text Range	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4a
Chemiresistive CO concentration range minimum	10 to 100 ppm	—	range	Text Range	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4a
Relative response of NH3 and SO2 versus CO	if response of CO is 100% then response of NH3 and SO2 is 20%	—	—	Text Rounded Reported	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4a
Interdigitated electrode aperture/gap	3 um	0.000003 m	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement
Interdigitated electrode length	9.7 mm	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement
Interdigitated electrode width	5.6 mm	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement
Dynamic gas-sensing chamber volume	approximately 15 cm3	—	approximately	Text Approximate	4 · 4.1. Gas sensor fabrication and measurement · Fig. S1
Regulated relative humidity for sensing experiments	30% relative humidity	—	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement
Gas-sensing measurement temperature	28 C	301.15 K	—	Text Exact Reported	4 · 4.1. Gas sensor fabrication and measurement
SI dynamic gas-sensing setup components	Analyte and air cylinders with MFCs, mixer, sensing chamber/device, Keithley 4200A, computer and exhaust	—	—	Visual Estimate Qualitative	2 · Figure · Figure S1

Chemiresistive humidity-dependence test

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

CO 30 ppm after baseline stabilisation; relative humidity controlled by dry air concentration of bubbler

Temperature: 301
Atmosphere: CO in dry air with varied relative humidity
Geometry: Zn-HHTP on IDE
Context: pristine Zn-HHTP sensor device
Measurement source: 4 · 4.1. Gas sensor fabrication and measurement · Fig. 4b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Approximate resistance at high humidity for CO 30 ppm	about 510 kOhm at about 80% RH	—	visual estimate from Fig. 4b	Figure Axis Approximate	6 · 4.1. Gas sensor fabrication and measurement · Fig. 4b
Humidity range affecting response lower bound	40-80% relative humidity	—	range lower bound	Text Range	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4b
Humidity range affecting response upper bound	40-80% relative humidity	—	range upper bound	Text Range	4 · 4.1. Gas sensor fabrication and measurement · Fig. 4b

Chemiresistive response and recovery time test

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

CO 30 ppm; gas on/off transient

Temperature: 301
Atmosphere: CO in dry air
Geometry: Zn-HHTP on IDE
Context: pristine Zn-HHTP sensor device
Measurement source: 5 · 4.1. Gas sensor fabrication and measurement · Fig. 4e

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Chemiresistive recovery time for CO at 30 ppmMarked as a best value within this paper	150 s / 2.5 min	2.5 min	—	Text Exact Reported	5 · 4.1. Gas sensor fabrication and measurement · Fig. 4e; Table 2
Chemiresistive response time for CO at 30 ppmMarked as a best value within this paper	56 s	—	—	Text Exact Reported	5 · 4.1. Gas sensor fabrication and measurement · Fig. 4e; Table 2

Chemiresistive repeatability and stability

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

Repeated 10 ppm CO exposures and 30 ppm response tracked every 5 days for 60 days

Temperature: 301
Atmosphere: CO in dry air
Geometry: Zn-HHTP on IDE
Context: pristine Zn-HHTP sensor device
Measurement source: 5 · 4.1. Gas sensor fabrication and measurement · Fig. 4d inset

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Chemiresistive stability test duration	60 days	—	—	Text Exact Reported	5 · 4.1. Gas sensor fabrication and measurement · Fig. 4d

Chem-FET CO sensing

Field-effect transistor measurements

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

Vds optimised at 1 V and kept constant; drain current recorded while varying CO concentration

Temperature: 301
Atmosphere: CO analyte
Geometry: Zn-HHTP Chem-FET, source/drain bridged by Zn-HHTP MOF
Context: pristine Zn-HHTP FET device
Measurement source: 8 · 4.4. Chem-FET sensing · Fig. 5c,e

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Approximate Chem-FET drain current at 100 ppm CO	about 91 uA at 100 ppm CO	0.000091 A	visual estimate from Fig. 5e	Figure Axis Approximate	7 · 4.4. Chem-FET sensing · Fig. 5e
Approximate Chem-FET drain current at 20 ppm CO	about 152 uA at 20 ppm CO	0.000152 A	visual estimate from Fig. 5e	Figure Axis Approximate	7 · 4.4. Chem-FET sensing · Fig. 5e
Chem-FET CO lower detection limit	20 ppm	—	—	Text Exact Reported	8 · 4.4. Chem-FET sensing · Fig. 5c,e
Chem-FET CO response trend	drain current decreases upon exposure to CO and decreases with increasing CO concentration	—	—	Text Qualitative	8 · 4.4. Chem-FET sensing · Fig. 5c,e
Chem-FET sensing Vds	Vds optimized as 1 V and kept constant	—	—	Text Exact Reported	8 · 4.4. Chem-FET sensing · Fig. 5c,e

Principal component analysis of gas responses

Zn-HHTP on interdigitated Au electrodes on Si/SiO2 · Electrode

Origin 9 Pro PCA; CO, NH3 and SO2 responses recorded after baseline stabilisation; each sample sampled three times

Temperature: 301
Atmosphere: CO, NH3 and SO2
Geometry: Zn-HHTP on IDE
Context: pristine Zn-HHTP sensor device
Measurement source: 5 · 4.2. Multivariate Analysis (Principal Component Analysis) · Fig. 4f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
PCA PC1 variance contribution	95.72% in text; Fig. 4f axis reads 95.25%	—	text/figure discrepancy	Text Uncertain	5 · 4.2. Multivariate Analysis (Principal Component Analysis) · Fig. 4f
PCA PC2 variance contribution	2.82%	—	—	Text Exact Reported	5 · 4.2. Multivariate Analysis (Principal Component Analysis) · Fig. 4f
PCA first two PCs total contribution	98.54%	—	—	Text Exact Reported	5 · 4.2. Multivariate Analysis (Principal Component Analysis) · Fig. 4f