کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1812742 1025623 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen sensing characteristics and mechanism of nanosize TiO2 dope with metallic ions
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Hydrogen sensing characteristics and mechanism of nanosize TiO2 dope with metallic ions
چکیده انگلیسی

Nanosize TiO2 doped with metallic ions including Ag+, Sb2+, Ni2+ , Co2+, and Ce3+ powders were prepared by sol–gel method. X-ray diffraction was used to confirm the phase composition of the powders. Hydrogen sensing characteristics of these samples were investigated. The first-principles approach of density functional theory (DFT) is used to study the density of state (DOS) of TiO2-doping metallic ions. The results show that hydrogen sensing property of the TiO2 was remarkably enhanced by adding Ag+, its sensitivity value is 3.6 to 200 ppm hydrogen at 360 °C. The DOS of Sb2+, Ni2+, Co2+ and Ce3+ doped-TiO2 has not been changed obviously after adsorbing H atom, while the DOS of Ag+-doped TiO2 has changed distinctly. The variety of the electronic structure of Ag+-doped TiO2 cause the change of the conductance of the sensor, so the hydrogen sensing properties of TiO2 can be enhanced by doping Ag+ ion.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 405, Issue 2, 15 January 2010, Pages 564–568
نویسندگان
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