کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1334050 979136 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
S-, N- and C-doped titanium dioxide nanoparticles: Synthesis, characterization and redox charge transfer study
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
S-, N- and C-doped titanium dioxide nanoparticles: Synthesis, characterization and redox charge transfer study
چکیده انگلیسی

Herein we report on the synthesis and characterization of TiO2 nanomaterials doped with anions like sulfur, carbon and nitrogen. Upon doping, the absorption extends well into the visible region. This shift in the absorption edge is accompanied by a concomitant narrowing of band gap. The resulting anion-doped TiO2 nanomaterials were characterized by XRD, XPS, elemental analysis, EDAX, TEM, UV-DRS, DC conductivity, AC impedance and cyclic voltammetric studies. XPS confirms the presence of the dopants and the elemental analysis determined the amount of dopants in TiO2. Electrochemical characterization was carried out by cyclic voltammetry at pHs 2, 6.5 and 10. As against the response of undoped TiO2, the doped samples show an active electrochemical response indicating an induced charge transfer across the titania/solution interface, thus forming two anodic peaks and a cathodic peak. This interesting and significant observation was understood in terms of band bending due to anion doping as well as to the pH changes in the experimental solutions.

Schematic representations of N-doped TiO2: (a) band diagram and (b) band bending at the interface.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 178, Issue 11, November 2005, Pages 3352–3358
نویسندگان
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