NDLI: Ethanol Gas Sensor Based on Pure and La-Doped Bismuth Vanadate

Content Provider	Springer Nature Link
Author	Golmojdeh, Hosein Zanjanchi, Mohamad Ali
Copyright Year	2013
Abstract	Bismuth vanadate (BiVO$_{4}$) and lanthanum-doped bismuth vanadate (La-doped BiVO$_{4}$) were prepared via the precipitation method. Their films were produced by simple drop-coating of the initial solutions over gold electrodes, which were coated over a glass substrate. The structural properties of BiVO$_{4}$ and La-doped BiVO$_{4}$ samples were studied using x-ray diffractometer, diffuse reflectance spectroscopy, scanning electron microscopy, atomic force microscopy, and compositional analysis. A chamber was designed to install the sensing device and also controllable tools for gas flow rate and temperature. Changes in the resistance of the prepared layers were recorded during exposure to various amounts of ethanol vapor at different temperatures. Both BiVO$_{4}$ and La-doped BiVO$_{4}$ layers showed measurable responses in the form of resistance drop (increased conductivity). The higher temperatures up to 450 °C led to stronger signals. The layer containing lanthanum showed signals with shorter recovery times. Introduction of lanthanum caused smaller crystallite sizes in addition to the formation of tetragonal phase of BiVO$_{4}$. Presence of lanthanum increased the amounts of grain boundaries, magnitude of the response, and sensitivity. Sensitivity of La-doped BiVO$_{4}$ was almost twice that of the BiVO$_{4}$ at concentrations of 150–500 ppm of ethanol. Also, the correlation of the response as a function of concentration of ethanol in gas phase was exploited, and two different linear ranges were observed for the lower and higher concentrations.
Starting Page	528
Ending Page	534
Page Count	7
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	43
Issue Number	2
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2013-12-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	BiVO$_{4}$ film gas sensing ethanol Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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