Prospects for Using Graphene Nanomaterials: Sorbents, Membranes, and Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

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Sulfur Dioxide Sensors

10.21741/9781644901236 ◽

2021 ◽

Keyword(s):

Ionic Liquids ◽

Sulfur Dioxide ◽

Metal Oxide ◽

Gas Sensors ◽

Optical Sensors ◽

Recent Progress ◽

Amperometric Sensors ◽

Metal Oxide Sensors ◽

Semiconducting Metal Oxide

Recent progress on the sensing and monitoring of sulfur dioxide in the environment is presented. The sensing materials covered include potentiometric gas sensors, amperometric sensors, optical sensors involving colorimetric and fluorescence changes, sensors based on ionic liquids, semiconducting metal-oxide sensors, photoacoustic detectors and biosensors.

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On the Use of MOFs and ALD Layers as Nanomembranes for the Enhancement of Gas Sensors Selectivity

Nanomaterials ◽

10.3390/nano9111552 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1552 ◽

Cited By ~ 3

Author(s):

Weber ◽

Graniel ◽

Balme ◽

Miele ◽

Bechelany

Keyword(s):

Thin Films ◽

Gas Sensors ◽

Gas Sensing ◽

Metal Organic Frameworks ◽

Atomic Layer ◽

Operational Performance ◽

Layer Deposition ◽

Metal Organic ◽

Further Development ◽

Different Gases

Improving the selectivity of gas sensors is crucial for their further development. One effective route to enhance this key property of sensors is the use of selective nanomembrane materials. This work aims to present how metal-organic frameworks (MOFs) and thin films prepared by atomic layer deposition (ALD) can be applied as nanomembranes to separate different gases, and hence improve the selectivity of gas sensing devices. First, the fundamentals of the mechanisms and configuration of gas sensors will be given. A selected list of studies will then be presented to illustrate how MOFs and ALD materials can be implemented as nanomembranes and how they can be implemented to improve the operational performance of gas sensing devices. This review comprehensively shows the benefits of these novel selective nanomaterials and opens prospects for the sensing community.

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