کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7137666 1461899 2013 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
LPG sensing by p-polyaniline/n-PbS heterojunction junction capacitance structure
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
LPG sensing by p-polyaniline/n-PbS heterojunction junction capacitance structure
چکیده انگلیسی
In the present work, p-polyaniline/n-PbS heterojunction is fabricated by electrochemical polymerization of polyaniline over the pre-deposited PbS thin film. Electrical properties such as static resistance, rectification ratio, ideality factor for different thicknesses of PbS and polyaniline are determined. Room temperature (300 K) liquefied petroleum gas (LPG) sensing ability of p-polyaniline/n-PbS heterojunction is investigated using junction capacitance. Scanning electron microscopy (SEM) study shows that PbS thin film consists of compact nanograins whereas polyaniline exhibited highly porous structure. Heterojunction showed decrease in forward biased current after exposure to LPG due to increased barrier height (ϕB) of the junction interface. The increased barrier height is confirmed by observing junction capacitance after exposure of LPG. Variation in junction capacitance is used to detect the sensing of LPG at room temperature (300 K).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators A: Physical - Volume 201, 15 October 2013, Pages 387-394
نویسندگان
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