Electron Paramagnetic Resonance Investigation of Charge Transfer in TiO2(B)/Anatase and N–TiO2(B)/Anatase Mixed-Phase Nanowires: The Relative Valence and Conduction Band Edges in the Two Phases
| العنوان: | Electron Paramagnetic Resonance Investigation of Charge Transfer in TiO2(B)/Anatase and N–TiO2(B)/Anatase Mixed-Phase Nanowires: The Relative Valence and Conduction Band Edges in the Two Phases |
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| المؤلفون: | Neeruganti O. Gopal, Hsin-Hsi Lo, Shyue-Chu Ke, Shiann-Cherng Sheu |
| المصدر: | The Journal of Physical Chemistry C. 118:2877-2884 |
| بيانات النشر: | American Chemical Society (ACS), 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | Anatase, Materials science, Valence (chemistry), Band gap, Analytical chemistry, Electron, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Electron transfer, General Energy, Nuclear magnetic resonance, law, Charge carrier, Physical and Theoretical Chemistry, Electron paramagnetic resonance, Spectroscopy |
| الوصف: | Regarding how photogenerated charge carriers are transferred in TiO2(B)/anatase mixed-phase nanowires, no unified conclusion has been reached. Electron paramagnetic resonance (EPR) spectroscopy is employed to investigate the vectorial charge transfer in this material. When the material is subjected to UV irradiation, we show that holes stimulated in anatase are transferred to TiO2(B) by comparing EPR-detected amounts of trapped hole O– accumulated on TiO2(B) with X-ray diffraction (XRD)-determined TiO2(B) bulk phase compositions. Under visible-light irradiation which only activates the TiO2(B) phase, we unambiguously show that electron transfer occurs from TiO2(B) to anatase. Without intervention of other charge carriers generated by bandgap excitation, we monitor exclusively the fate of conducting electrons generated by specific excitation of N– midgap states of TiO2(B) with holes localized on the N atom in N-doped TiO2(B)/anatase. The result again clearly demonstrates that electrons migrate from TiO2(B)... |
| تدمد: | 1932-7455 1932-7447 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::fea8cec28439b41ad2ced606d01d025dTest https://doi.org/10.1021/jp411723mTest |
| رقم الانضمام: | edsair.doi...........fea8cec28439b41ad2ced606d01d025d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19327455 19327447 |
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