Lightweight, Room-Temperature CO<sub>2</sub> Gas Sensor Based on Rare-Earth Metal-Free Composites—An Impedance Study

Willa, Christoph; Schmid, Alexander; Briand, D.; Yuan, Jiayin; Koziej, Dorota

doi:10.1021/acsami.7b07379

Cited by 49 publications

(26 citation statements)

References 42 publications

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“…References: PANI, PEI/PANI; 16 PEI/PEDOT; 19 PEI/CNT; 18 rGO; 37,38 PEI/rGO; 39 graphene; 40 graphene/PEDOT; 41 La 2 O 2 CO 3 –NP/PIL; 42 Al 2 O 3 –NP/PIL. 43…”

Section: Resultsmentioning

confidence: 99%

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

et al. 2019

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A growing demand for indoor atmosphere monitoring relies critically on the ability to reliably and quantitatively detect carbon dioxide. Widespread adoption of CO 2 sensors requires vastly improved materials and approaches because selective sensing of CO 2 under ambient conditions, where relative humidity (RH) and other atmosphere contaminants provide a complex scenario, is particularly challenging. This report describes an ambient CO 2 chemiresistor platform based on nanoporous, electrically conducting two-dimensional metal–organic frameworks (2D MOFs). The CO 2 chemiresistive sensitivity of 2D MOFs is attained through the incorporation of imino-semiquinonate moieties, i.e., well-defined N-heteroatom functionalization. The best performance is obtained with Cu 3 (hexaiminobenzene) 2 , Cu 3 HIB 2 , which shows selective and robust ambient CO 2 sensing properties at practically relevant levels (400–2500 ppm). The observed ambient CO 2 sensitivity is nearly RH-independent in the range 10–80% RH. Cu 3 HIB 2 shows higher sensitivity over a broader RH range than any other known chemiresistor. Characterization of the CO 2 -MOF interaction through a combination of in situ optical spectroscopy and density functional theory calculations evidence autogenously generated hydrated adsorption sites and a charge trapping mechanism as responsible for the intriguing CO 2 sensing properties of Cu 3 HIB 2 .

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“…References: PANI, PEI/PANI; 16 PEI/PEDOT; 19 PEI/CNT; 18 rGO; 37,38 PEI/rGO; 39 graphene; 40 graphene/PEDOT; 41 La 2 O 2 CO 3 –NP/PIL; 42 Al 2 O 3 –NP/PIL. 43…”

Section: Resultsmentioning

confidence: 99%

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

et al. 2019

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“…Especially in nanostructure based gas sensors, environmental humidity is a crucial factor for accurate and reliable gas sensing. Water molecules in humid environments easily attach to the sensor surface and hinder the reaction between the target gas and reaction sites on SnO 2 , thereby inducing a false signal and reducing the sensitivity and long-term stability [ 1 , 2 , 28 , 29 , 30 ]. Furthermore, when the nanostructured SnO 2 layer is formed on the sensor surface, the water molecules in humid air condense into water droplets on the surface and thereafter infiltrate the nanostructures, causing the collapse of the morphology.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Monolayers Coated Porous SnO2 Film Gas Sensor with Reduced Humidity Influence

Lee

Park

et al. 2021

Sensors

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Metal-oxide sensors, detect gas through the reaction of surface oxygen molecules with target gases, are promising for the detection of toxic pollutant gases, combustible gases, and organic vapors; however, their sensitivity, selectivity, and long-term stability limit practical applications. Porous structure for increasing surface area, adding catalyst, and altering the operation temperature are proposed for enhancing the sensitivity and selectivity. Although humidity can significantly affect the property and stability of the sensors, studies focusing on the long-term stability of gas sensors are scarce. To reduce the effects of humidity, 1H, 1H, 2H, 2H–perfluorooctyltriethoxysilane (PFOTS) was coated on a porous SnO2 film. The interconnected SnO2 nanowires improved the high surface area, and the PFOTS coating provided superhydrophobicity at water contact angle of 159°and perfect water vapor repellency inside E-SEM. The superhydrophobic porous morphology was maintained under relative humidity of 99% and operating temperature of 300 °C. The CO gas sensing of 5, 20, and 50 ppm were obtained with linearity at various humidity. Flame detection was also achieved with practical high humidity conditions. These results suggest the simple way for reliable sensing of nanostructured metal-oxide gas sensors with high sensitivity and long-term stability even in highly humid environments.

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“…3 Furthermore, the presence of carbon dioxide in the environment is steadily increasing as it is generated from motor vehicles, industries and other resources, which are logically responsible for increased global warming. [4][5][6] The industrial revolution is one of the major factors responsible for increasing the carbon dioxide levels. Thus, the tracking and control of carbon dioxide is essentially important in food packaging and breath analysis technologies.…”

Section: Introductionmentioning

confidence: 99%

A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO₂) for sensing carbon dioxide gas and humidity

Manikandan¹,

Petrila

Vigneselvan

et al. 2020

RSC Adv.

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Lightweight, Room-Temperature CO₂ Gas Sensor Based on Rare-Earth Metal-Free Composites—An Impedance Study

Cited by 49 publications

References 42 publications

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

Self-Assembled Monolayers Coated Porous SnO2 Film Gas Sensor with Reduced Humidity Influence

A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO₂) for sensing carbon dioxide gas and humidity

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Lightweight, Room-Temperature CO2 Gas Sensor Based on Rare-Earth Metal-Free Composites—An Impedance Study

Cited by 49 publications

References 42 publications

Chemiresistive Sensing of Ambient CO2 by an Autogenously Hydrated Cu3(hexaiminobenzene)2 Framework

Chemiresistive Sensing of Ambient CO2 by an Autogenously Hydrated Cu3(hexaiminobenzene)2 Framework

Self-Assembled Monolayers Coated Porous SnO2 Film Gas Sensor with Reduced Humidity Influence

A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO2) for sensing carbon dioxide gas and humidity

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Lightweight, Room-Temperature CO₂ Gas Sensor Based on Rare-Earth Metal-Free Composites—An Impedance Study

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

Chemiresistive Sensing of Ambient CO₂ by an Autogenously Hydrated Cu₃(hexaiminobenzene)₂ Framework

A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO₂) for sensing carbon dioxide gas and humidity