Metal oxides nanowires chemical/gas sensors: recent advances

: 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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In(Ga)N Nanostructures and Devices Grown by Molecular Beam Epitaxy and Metal-Assisted Photochemical Etching

Nanomaterials ◽

10.3390/nano11010126 ◽

2021 ◽

Vol 11 (1) ◽

pp. 126

Author(s):

Abdul Kareem K. Soopy ◽

Zhaonan Li ◽

Tianyi Tang ◽

Jiaqian Sun ◽

Bo Xu ◽

...

Keyword(s):

Molecular Beam Epitaxy ◽

Gas Sensors ◽

Molecular Beam ◽

Light Emitting Diodes ◽

Crystal Quality ◽

Porous Structures ◽

Light Emitting ◽

Photochemical Etching ◽

Recent Advances ◽

Low Dimensional

This review summarizes the recent research on nitride nanostructures and their applications. We cover recent advances in the synthesis and growth of porous structures and low-dimensional nitride nanostructures via metal-assisted photochemical etching and molecular beam epitaxy. The growth of nitride materials on various substrates, which improves their crystal quality, doping efficiency, and flexibility of tuning performance, is discussed in detail. Furthermore, the recent development of In(Ga)N nanostructure applications (light-emitting diodes, lasers, and gas sensors) is presented. Finally, the challenges and directions in this field are addressed.

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Recent advances of layered-transition metal oxides for energy-related applications

Energy Storage Materials ◽

10.1016/j.ensm.2021.01.004 ◽

2021 ◽

Vol 36 ◽

pp. 514-550

Author(s):

Zhihao Lei ◽

Jang Mee Lee ◽

Gurwinder Singh ◽

C.I. Sathish ◽

Xueze Chu ◽

...

Keyword(s):

Transition Metal ◽

Metal Oxides ◽

Transition Metal Oxides ◽

Recent Advances ◽

Layered Transition Metal

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An overview of the recent advances of carbon quantum dots/metal oxides in the application of heterogeneous photocatalysis in photodegradation of pollutants towards visible-light and solar energy exploitation

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105199 ◽

2021 ◽

Vol 9 (3) ◽

pp. 105199

Author(s):

Zeng Wei Heng ◽

Woon Chan Chong ◽

Yean Ling Pang ◽

Chai Hoon Koo

Keyword(s):

Quantum Dots ◽

Solar Energy ◽

Visible Light ◽

Metal Oxides ◽

Carbon Quantum Dots ◽

Heterogeneous Photocatalysis ◽

Recent Advances ◽

Energy Exploitation

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CuxO Nanostructure-Based Gas Sensors for H2S Detection: An Overview

Chemosensors ◽

10.3390/chemosensors9060127 ◽

2021 ◽

Vol 9 (6) ◽

pp. 127

Author(s):

Sachin Navale ◽

Mehrdad Shahbaz ◽

Sanjit Manohar Majhi ◽

Ali Mirzaei ◽

Hyoun-Woo Kim ◽

...

Keyword(s):

Metal Oxides ◽

Gas Sensors ◽

Noble Metals ◽

Oil And Gas ◽

Detection Mechanism ◽

Reliable Detection ◽

Electrical Sensing ◽

Semiconducting Metal Oxides ◽

H2s Detection

H2S gas is a toxic and hazardous byproduct of the oil and gas industries. It paralyzes the olfactory nerves, with concentrations above 100 ppm, resulting in loss of smell; prolonged inhalation may even cause death. One of the most important semiconducting metal oxides for the detection of H2S is CuxO (x = 1, 2), which is converted to CuxS upon exposure to H2S, leading to a remarkable modulation in the resistance and appearance of an electrical sensing signal. In this review, various morphologies of CuxO in the pristine form, composites of CuxO with other materials, and decoration/doping of noble metals on CuxO nanostructures for the reliable detection of H2S gas are thoroughly discussed. With an emphasis to the detection mechanism of CuxO-based gas sensors, this review presents findings that are of considerable value as a reference.

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