Journal ArticleDOI
Conduction Model of Metal Oxide Gas Sensors
Nicolae Barsan,Udo Weimar +1 more
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TLDR
In this article, the authors provide a frame model that deals with all contributions involved in conduction within a real world sensor, and then summarize the contributions together with their interactions in a general applicable model for real world gas sensors.Abstract:
Tin dioxide is a widely used sensitive material for gas sensors. Many research and development groups in academia and industry are contributing to the increase of (basic) knowledge/(applied) know-how. However, from a systematic point of view the knowledge gaining process seems not to be coherent. One reason is the lack of a general applicable model which combines the basic principles with measurable sensor parameters. The approach in the presented work is to provide a frame model that deals with all contributions involved in conduction within a real world sensor. For doing so, one starts with identifying the different building blocks of a sensor. Afterwards their main inputs are analyzed in combination with the gas reaction involved in sensing. At the end, the contributions are summarized together with their interactions. The work presented here is one step towards a general applicable model for real world gas sensors.read more
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Chemiresistive gas sensors employing solution-processed metal oxide quantum dot films
Huan Liu,Songman Xu,Min Li,Gang Shao,Huaibing Song,Wenkai Zhang,Wendian Wei,Mingze He,Liang Gao,Haisheng Song,Jiang Tang +10 more
TL;DR: In this paper, a low-temperature chemiresistive gas sensors based on tin oxide colloidal quantum dots (CQDs) was reported, in which the benefits of CQDs such as extremely small crystal size, solution-processability, and tunable surface activity are exploited to enhance the gas-sensing effect.
Journal ArticleDOI
Light-activated gas sensing of Bi2O3-core/ZnO-shell nanobelt gas sensors
TL;DR: In this paper, the NO 2 gas sensing properties of β -Bi 2 O 3 nanobelts encapsulated with ZnO were examined, and multiple networked Bi 2 O3 -core/ZnO-shell nanobelt sensors showed responses of 113-198% and 227-665% to 1-5-ppm NO 2 at room temperature in the dark and under UV illumination, respectively.
Journal ArticleDOI
Fabrication of novel flower-like Co3O4 structures assembled by single-crystalline porous nanosheets for enhanced xylene sensing properties
TL;DR: In this article, a flower-like Co 3 O 4 (Co 2 O 4 ) was fabricated by an EEG mediated solvothermal with the co-assistant of water and polyvinyl pyrrolidone (PVP).
Journal ArticleDOI
Effect of Morphology on the Response of Polyaniline-based Conductometric Gas Sensors: Nanofibers vs. Thin Films
TL;DR: Mixtures of methanol with increasing fractions of formic acid were used to progressively transform the morphology of polyaniline starting from nanofibers to compact conventional films as mentioned in this paper.
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Design and application of nanoporous graphene oxide film for CO2, H2, and C2H2 gases sensing
TL;DR: In this article, a two-dimensional nanoporous graphene oxide (NGO) film sensor is designed by combining the modified Hummer method and the spray pyrolysis technique, which is used as a detector for CO2, H2, C2H2 gases at room temperature (20°C).
References
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Book
The surface science of metal oxides
TL;DR: In this paper, the electronic structure of transition metal-oxide surfaces is described. But the electronic structures of non-transition metaloxide surfaces have not been discussed, and they are not considered in this paper.
Book
The Chemical Physics of Surfaces
S. R. Morrison,Peder J. Estrup +1 more
TL;DR: In this paper, the authors present an approach for the reconstruction of the surface of a solid with respect to the Fermi energy in the band diagram of the solid and its surface.
Journal ArticleDOI
Interactions of tin oxide surface with O2, H2O AND H2
TL;DR: In this paper, the authors investigated the interaction of tin oxide surface with oxygen, water vapor, and hydrogen using temperature-programmed desorption (TPD) chromatograms of oxygen.