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
Citations
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UV-activated formaldehyde sensing properties of hollow TiO2@SnO2 heterojunctions at room temperature
TL;DR: In this article, a hollow TiO2@SnO2 heterojunction nanospheres based sensor exhibited better sensing properties to formaldehyde under Ultraviolet (UV) irradiation at room temperature.
Journal ArticleDOI
Cr-doped WO3 nanosheets: Structural, optical and formaldehyde sensing properties
TL;DR: In this article, X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), and transmission electron microscope (TEM) images of undoped and Cr-doped WO3 nanosheets have been used to study the influence of doping on their structural and morphological properties.
Journal ArticleDOI
Recent advances and perspectives on constructing metal oxide semiconductor gas sensing materials for efficient formaldehyde detection
Zejun Han,Yuan Qi,Zhengyi Yang,Hecheng Han,Yanyan Jiang,Wenjing Du,Xue Zhang,Jizhi Zhang,Zhengfei Dai,Wu Lili,Cameron S. Fletcher,Wang Zhou,Jiurong Liu,Guixia Lu,Fenglong Wang +14 more
TL;DR: In this paper, the authors introduce the fundamental mechanisms by which metal oxide semiconductor sensors can detect formaldehyde, followed by a summary of the current state-of-the-art research progress on sensing materials.
Journal ArticleDOI
Monitoring breath markers under controlled conditions.
Marco Righettoni,Alessandro Ragnoni,Andreas T. Güntner,Claudio Loccioni,Sotiris E. Pratsinis,Terence H. Risby +5 more
TL;DR: A portable prototype, consisting of a commercial breath sampler modified to work as a platform for solid-state gas sensors was developed, which helps a subject control their exhaled flow rate which increases reproducibility of intra-subject breath samples.
Journal ArticleDOI
Preparation of hollow porous Co-doped SnO2 microcubes and their enhanced gas sensing property
TL;DR: Hollow porous Co-doped SnO2 microcubes were achieved by a template-free chemical solution route combined with subsequent alkali-washing, calcination and acid-washing process as mentioned in this paper.
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.