The Gas Sensing Mechanism of the Low-Dimension Carbon Composites with Metal Oxide Quantum Dots

Abstract ZnO quantum dots sensitized SnO2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO2 gas under UV irradiation at 40oC. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.

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Carbon nanotube-metal oxide nanocomposite gas sensing mechanism assessed via NO2 adsorption on n-WO3/p-MWCNT nanocomposites

Ceramics International ◽

10.1016/j.ceramint.2020.08.097 ◽

2020 ◽

Vol 46 (18) ◽

pp. 29233-29243 ◽

Cited By ~ 1

Author(s):

Nguyen Manh Hung ◽

Nguyen Duc Chinh ◽

Tien Dai Nguyen ◽

Eui Tae Kim ◽

GyuSeok Choi ◽

...

Keyword(s):

Carbon Nanotube ◽

Metal Oxide ◽

Gas Sensing ◽

Sensing Mechanism ◽

No2 Adsorption

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Gas Sensing Mechanism of Metal Oxide Doped PANi Composites

Journal of Materials Science and Engineering B ◽

10.17265/2161-6221/2013.05.006 ◽

2013 ◽

Vol 3 (5) ◽

Author(s):

Kailash R. Nemade ◽

Sandeep A. Waghuley

Keyword(s):

Metal Oxide ◽

Gas Sensing ◽

Sensing Mechanism

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Thickness Effect and Mesoscopic Character of the Metal Oxide Gas Sensing Nano-Thin Films

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.121-123.1341 ◽

2007 ◽

Vol 121-123 ◽

pp. 1341-1346

Author(s):

Jian Ping Xing ◽

Juan Li ◽

Lei Zhou ◽

Jian Ming Li ◽

Nan Yuan Qiu

Keyword(s):

Thin Films ◽

Metal Oxide ◽

Film Thickness ◽

Characteristic Time ◽

Gas Sensing ◽

Diffusion Reaction ◽

Thickness Effect ◽

Optimum Thickness ◽

Sensing Mechanism ◽

Activity Energy

The characters of metal oxide gas sensing nano-thin films are studied. The formula of the dynamical thickness effect characteristic time is given. The relation of the sensitivity Sn and the film thickness l, the character of existing the optimum thickness, the character of the change of conductance activity energy with the film thickness are given also. The idea of diffusion reaction of gas sensing mechanism and the idea of mesoscopic effect in the nano-thin films are proposed.

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Metal-oxide based ammonia gas sensors: A review

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681210999200718005402 ◽

2020 ◽

Vol 10 ◽

Author(s):

Priya Gupta ◽

Savita Maurya ◽

Narendra Kumar Pandey ◽

Vernica Verma

Keyword(s):

Metal Oxide ◽

Metal Oxides ◽

Gas Sensor ◽

Gas Sensors ◽

Review Paper ◽

Gas Sensing ◽

Gas Sensitivity ◽

Ammonia Gas ◽

Ammonia Sensing ◽

Ammonia 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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Explosive Molecule Sensing at Lattice Defect Sites in Metallic Carbon Nanotubes

Materials Advances ◽

10.1039/d1ma00571e ◽

2021 ◽

Author(s):

Manasi Doshi ◽

Eric Paul Fahrenthold

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Experimental Research ◽

Gas Sensing ◽

Lattice Defect ◽

Sensing Mechanism ◽

Defect Sites ◽

Chemiresistive Sensing ◽

Hazardous Gas

Explosives and hazardous gas sensing using carbon nanotube (CNT) based sensors has been a focus of considerable experimental research. The simplest sensors have employed a chemiresistive sensing mechanism, and rely...

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Advanced development of metal oxide nanomaterials for H2 gas sensing applications

Materials Advances ◽

10.1039/d0ma00880j ◽

2021 ◽

Author(s):

Yushu Shi ◽

Huiyan Xu ◽

Tongyao Liu ◽

Shah Zeb ◽

Yong Nie ◽

...

Keyword(s):

Metal Oxide ◽

Gas Sensors ◽

Gas Sensing ◽

The Past ◽

Sensing Applications ◽

The Future ◽

Metal Oxide Nanomaterials ◽

Nanomaterials Synthesis ◽

Advanced Development

The scheme of the structure of this review includes an introduction from the metal oxide nanomaterials’ synthesis to application in H2 gas sensors—a vision from the past to the future.

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