کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
745323 894418 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impedance spectroscopy analysis of TiO2 thin film gas sensors obtained from water-based anatase colloids
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Impedance spectroscopy analysis of TiO2 thin film gas sensors obtained from water-based anatase colloids
چکیده انگلیسی

In this work impedance spectroscopy technique was employed in order to characterize the gas-sensing behavior of undoped titanium dioxide (TiO2) polycrystalline thin films. The electrical measurements were performed in a sensor-testing chamber that allows independent control of temperature, pressure, gas composition and flow rate. Frequency measurements, in the range from 40 Hz to 110 MHz, were performed in order to evaluate the gas sensor response of the samples as a function of temperature (50–350 °C) and surrounding atmosphere (vacuum or air at atmospheric pressure). Impedance spectroscopy is a very useful and important technique due to the possibility of using this method for discriminating between grain boundary capacitance (Cgb) and grain boundary resistance (Rgb) contributions. Therefore, a simple model taking into account variations in the intergranular potential barriers is proposed in this work.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 139, Issue 2, 4 June 2009, Pages 447–452
نویسندگان
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