کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7886146 1509784 2018 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Facile fabrication and superior gas sensing properties of spongelike Co-doped ZnO microspheres for ethanol sensors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Facile fabrication and superior gas sensing properties of spongelike Co-doped ZnO microspheres for ethanol sensors
چکیده انگلیسی
In this work, a novel strategy has been adopted for the synthesis of hybrid Co-doped ZnO (Co/ZnO) microspheres using the solvothermal method with a synergistic effect of ultrasonic and microwave radiation. The Co/ZnO microspheres were characterized by XRD, FE-SEM, XPS and BET techniques. Sensing tests revealed that the Co/ZnO microspheres exhibited highly better ethanol sensing properties than pure ZnO nanoparticles did, including lower limit of detection (less than 10 ppm), higher response (ca. 120-100 ppm ethanol), lower operating temperature (ca. 220 °C), faster response (10 s) and recovery time (5 s) and better selectivity. The superior gas sensing properties were mainly attributed to the incorporation of Co, which increased the amount of oxygen vacancies and adsorbed oxygen. The sensing mechanism has been explained by oxygen chemisorption on the ZnO surfaces and subsequent reactions of surface adsorbed oxygen species with the ethanol molecules.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 14, 1 October 2018, Pages 16773-16780
نویسندگان
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