کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
746629 894468 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Two mechanisms of conduction in polycrystalline SnO2
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Two mechanisms of conduction in polycrystalline SnO2
چکیده انگلیسی

Impedance spectroscopy was carried out on SnO2 thick films exposed to different atmospheres. Oxygen desorption and adsorption during heating and cooling processes, respectively, onto the grain surface affects the resistance and electrical capacitance of the sensors. Double parabolic Schottky-type potential barriers at grain boundaries were assumed to analyze the tunneling and thermionic contributions to conductivity. In addition, the influence of the temperature on the oxygen diffusion into the grains annihilating oxygen vacancies was studied. It was deduced that in-diffusion substantially affects the conductivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 136, Issue 1, 2 February 2009, Pages 230–234
نویسندگان
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