cMOF Evidence Base
Sensing Application — In Situ Growth of Conductive Metal-Organic Framework onto Cu2O for Highly Selective and Humidity-Independent Hydrogen Sulfide Detection in Food Quality Assessment

Measurement evidence

Sensing Application

In Situ Growth of Conductive Metal-Organic Framework onto Cu2O for Highly Selective and Humidity-Independent Hydrogen Sulfide Detection in Food Quality Assessment · Zhang F., Jiao C., Shang Y. et al. · ACS Sensors · 2024 · 1310-1320

9 measurement groups · 43 results

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

H2S response at varied working temperature

Cu2O@Cu3(BTC)2 powder · Powder

Cu2O@Cu3(BTC)2 sensor response to 50 ppm H2S at elevated temperatures, compared with CuHHTP-coated Cu2O room-temperature operation.

Temperature
406-598
Atmosphere
H2S in air
Geometry
sensor from Cu2O@Cu3(BTC)2 powder; exact electrode fabrication not repeated in SI route
Context
Comparison MOF-coated Cu2O sensor
Measurement source
p007 / 1316 · Results and Discussion · Figure S11
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Cu3(BTC)2 shell thickness44 nm——Figure Axis
Rounded Reported		p015 / S-14 · Supporting Information · Figure S11b
Cu2O@Cu3(BTC)2 required working-temperature range133-325 C——Text
Range		p007 / 1316 · Results and Discussion · Figure S11

Chemiresistive RH and H2S response test

CuHHTP interdigital electrode sensor · Electrode

CuHHTP-only sensor to RH from 11 to 94% and 50 ppm H2S at room temperature.

Temperature
298
Atmosphere
air; varied RH; H2S
Geometry
interdigital electrode sensor
Context
Pristine conductive MOF control
Measurement source
p005 / 1314 · Results and Discussion · Figure S6
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
CuHHTP-only sensor response to 50 ppm H2SS = 6.5%——Text
Exact Reported		p005 / 1314 · Results and Discussion · Figure S6b

Integrated H2S alarm system and GC validation

Integrated Cu2O@CuHHTP H2S alarm system · Electrode

Portable 5 cm x 5 cm system monitored H2S from about 50 g pork and egg at storage times from 0 to 48 h, room temperature about 25 C; green/red threshold 200 ppb.

Temperature
298
Atmosphere
headspace gas from pork/egg samples
Geometry
portable integrated system with LCD and indicator light
Context
Application using target Cu2O@CuHHTP sensor
Measurement source
p007 / 1316 · Application to Real Samples · Figure 6; Figures S14-S15
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Integrated-system egg H2S at 36 h374.4 ppb——Figure Axis
Rounded Reported		p006 / 1315 · Application to Real Samples · Figure 6d
Integrated-system egg H2S at 48 h1162.6 ppb——Figure Axis
Rounded Reported		p006 / 1315 · Application to Real Samples · Figure 6d
Egg fresh-to-decay transition time36 h at 374.4 ppb——Text
Exact Reported		p007 / 1316 · Application to Real Samples · Figure 6d
Integrated system relative error vs GCMarked as a best value within this paperwithin 9.4%——Text
Rounded Reported		p007 / 1316 · Application to Real Samples
Fresh/decay H2S threshold200 ppb——Text
Exact Reported		p007 / 1316 · Application to Real Samples · Figure 6a
GC egg H2S at 48 h1233.6 ppb——Figure Axis
Rounded Reported		p019 / S-18 · Supporting Information · Figure S15h
GC pork H2S at 48 h16895.2 ppb——Figure Axis
Rounded Reported		p018 / S-17 · Supporting Information · Figure S14h
Integrated-system pork H2S at 16 h235.4 ppb——Figure Axis
Rounded Reported		p006 / 1315 · Application to Real Samples · Figure 6c
Integrated-system pork H2S at 48 h16730.1 ppb——Figure Axis
Rounded Reported		p006 / 1315 · Application to Real Samples · Figure 6c
Pork fresh-to-decay transition time16 h at 235.4 ppb——Text
Exact Reported		p007 / 1316 · Application to Real Samples · Figure 6c

Chemiresistive H2S response curves

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

Room-temperature H2S response from 50 ppb to 50 ppm; Cu2O@CuHHTP-3 selected after H-factor optimisation.

Temperature
298
Atmosphere
air; laboratory humidity about 40 RH% unless otherwise stated
Geometry
drop-cast interdigital electrode
Context
Cu2O@CuHHTP-n series and controls
Measurement source
p006 / 1316 · Results and Discussion · Figures 5a and S7
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
ppb calibration slopey = 0.067x + 2.2——Figure Axis
Rounded Reported		p005 / 1314 · Results and Discussion · Figure 5a inset
ppm calibration slopey = 34.6x + 3.9——Figure Axis
Rounded Reported		p010 / S-9 · Supporting Information · Figure S7b
Linearity R2, ppb H2S rangeR2 = 0.9704——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure 5a
Linearity R2, ppm H2S rangeR2 = 0.9952——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure S7
Theoretical LoD from 3RMSMarked as a best value within this paperapproximately 10.3 ppb——Text
Approximate		p006 / 1316 · Results and Discussion
Reported LoD in comparison tableMarked as a best value within this paper50 ppb——Table
Exact Reported		p006 / 1315 · Results and Discussion · Table 1
Cu2O response to 50 ppm H2Sabout 315%——Visual Estimate
Approximate		p005 / 1314 · Results and Discussion · Figure 4b
Cu2O@CuHHTP-1 response to 50 ppm H2Sabout 285%——Visual Estimate
Approximate		p005 / 1314 · Results and Discussion · Figure 4b
Cu2O@CuHHTP-3 response to 50 ppm H2SMarked as a best value within this paperabout 225%——Visual Estimate
Approximate		p005 / 1314 · Results and Discussion · Figure 4b
Cu2O@CuHHTP-5 response to 50 ppm H2Sabout 135%——Visual Estimate
Approximate		p005 / 1314 · Results and Discussion · Figure 4b
Cu2O@CuHHTP-3 response to 10 ppm H2SMarked as a best value within this paper49.9%——Table
Exact Reported		p006 / 1315 · Results and Discussion · Table 1

Chemiresistive response under varied RH

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

H2S response and baseline humidity response under RH from 11 to 94%; main target concentration 5 ppm H2S.

Temperature
298
Atmosphere
air with varied relative humidity
Geometry
drop-cast interdigital electrode
Context
Composite target compared with bare Cu2O and other MOSs
Measurement source
p007 / 1316 · Results and Discussion · Figure 5d; Table S1
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Bare Cu2O response decrease at 75 RH%25.2% decrease——Text
Exact Reported		p007 / 1316 · Results and Discussion · Figure S10
Bare Cu2O response decrease at 94 RH%45.3% decrease——Text
Exact Reported		p007 / 1316 · Results and Discussion · Figure S10
Response retained at 94 RH%Marked as a best value within this paper86.8% retained——Text
Exact Reported		p007 / 1316 · Results and Discussion · Figure 5d
Response decrease at 75 RH%Marked as a best value within this paper2.6% decrease——Text
Exact Reported		p007 / 1316 · Results and Discussion · Figure 5d
Humidity stability improvement vs bare Cu2OMarked as a best value within this paper9.6-fold improvement——Text
Rounded Reported		p001 / 1310 · Abstract
Table S1 humidity-stability coefficientMarked as a best value within this paper2.6% (50/75 RH%)——SI Table
Exact Reported		p013 / S-12 · Supporting Information · Table S1

Dynamic response-recovery in N2-filled H2S gas

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

Sensor stabilised in N2 and exposed to H2S gas filled with N2 to test oxygen-species role.

Temperature
298
Atmosphere
N2 and H2S in N2
Geometry
drop-cast interdigital electrode
Context
Target composite sensor mechanism test
Measurement source
p007 / 1316 · Mechanism · Figure S20
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Response to 5 ppm H2S in air57.7%——Text
Exact Reported		p007 / 1316 · Mechanism · Figure S20
Response to 5 ppm H2S in N225.3%——Text
Exact Reported		p007 / 1316 · Mechanism · Figure S20

Repeated H2S response cycling and long-term response retention

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

Eight consecutive measurements to 5 ppm H2S; 5 ppm H2S tested every 10 days for three months.

Temperature
298
Atmosphere
air
Geometry
drop-cast interdigital electrode
Context
Target composite sensor
Measurement source
p006 / 1316 · Results and Discussion · Figure 5b,c
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Response reduction after three months9.1% reduction——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure 5c
RSD over eight 5 ppm H2S responses6.6%——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure 5b

Response/recovery time analysis

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

Time to respond and recover 90% of total resistance change for 100 ppb and 5 ppm H2S.

Temperature
298
Atmosphere
air
Geometry
drop-cast interdigital electrode
Context
Target composite sensor
Measurement source
p006 / 1316 · Results and Discussion · Figure S9
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Recovery time after 100 ppb H2S99 s——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure S9a
Recovery time after 5 ppm H2S558 s——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure S9b
Response time to 100 ppb H2S75 s——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure S9a
Response time to 5 ppm H2S97 s——Text
Exact Reported		p006 / 1316 · Results and Discussion · Figure S9b

JF02F chemiresistive gas-sensing test system

Cu2O@CuHHTP-3 interdigital electrode sensor · Electrode

8 V test voltage; lab about 25 C and about 40 RH%; exposure time fixed at 100 s; H2S concentrations from 50 ppb to 50 ppm generated from standard gases.

Temperature
298
Atmosphere
air, varied humidity, test gases
Geometry
interdigital electrode, 1 cm x 1.2 cm
Context
Composite target sensor and controls
Measurement source
p003 / 1312 · Sensor Fabrication and Measurement · Equations 1-5
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Maximum prepared H2S test concentration50 ppm——Text
Exact Reported		p003 / 1312 · Sensor Fabrication and Measurement
Minimum prepared H2S test concentration50 ppb——Text
Exact Reported		p003 / 1312 · Sensor Fabrication and Measurement
Laboratory humidityabout 40 RH%——Text
Approximate		p003 / 1312 · Sensor Fabrication and Measurement
Laboratory test temperatureabout 25 C——Text
Approximate		p003 / 1312 · Sensor Fabrication and Measurement
Gas-sensing test voltage8 V——Text
Exact Reported		p003 / 1312 · Sensor Fabrication and Measurement