Gonzalo-Juan, I. ; Macé, L. ; Tengeler, S. ; Mosallem, A. ; Nicoloso, N. ; Riedel, R. (2016)
Photoluminescence of urea- and urea/rhodamine B-capped TiO2 nanoparticles.
In: Materials Chemistry and Physics, 177
doi: 10.1016/j.matchemphys.2016.04.057
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Urea- and rhodamine B (RhB)-capped TiO2 nanoparticles (NPs) have been prepared by solvothermal synthesis and characterized by HRTEM, XRD, FTIR, XPS, optical absorption and photoemission. The urea and urea/RhB ligands are capped to the surface of the TiO2 NPs for the first time through carbamate bonding. The band gap of TiO2 is slightly reduced from 3.1 eV to 3.0 eV in the urea capped TiO2 NPs (TU) and 2.9 eV for the NPs capped with urea/RhB (TUR). The generation of new trapping states in TU and TUR at the conduction band edges (surface oxygen vacancies) has been confirmed by the Urbach law providing tail state energies of 180 meV and 270 meV, respectively. These tail states are considered to be responsible for the strong reduction of the photoluminescence at ≈400 nm and the increased emission at ≈600 nm in TU and TUR. The findings suggest that urea- and RhB-capped TiO2 NPs could have potential applications as photocatalysts, opto-electronic devices, sensors, biological labels and anti-bacterial agents.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Gonzalo-Juan, I. ; Macé, L. ; Tengeler, S. ; Mosallem, A. ; Nicoloso, N. ; Riedel, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Photoluminescence of urea- and urea/rhodamine B-capped TiO2 nanoparticles |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Juli 2016 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Materials Chemistry and Physics |
| Jahrgang/Volume einer Zeitschrift: | 177 |
| DOI: | 10.1016/j.matchemphys.2016.04.057 |
| Kurzbeschreibung (Abstract): | Urea- and rhodamine B (RhB)-capped TiO2 nanoparticles (NPs) have been prepared by solvothermal synthesis and characterized by HRTEM, XRD, FTIR, XPS, optical absorption and photoemission. The urea and urea/RhB ligands are capped to the surface of the TiO2 NPs for the first time through carbamate bonding. The band gap of TiO2 is slightly reduced from 3.1 eV to 3.0 eV in the urea capped TiO2 NPs (TU) and 2.9 eV for the NPs capped with urea/RhB (TUR). The generation of new trapping states in TU and TUR at the conduction band edges (surface oxygen vacancies) has been confirmed by the Urbach law providing tail state energies of 180 meV and 270 meV, respectively. These tail states are considered to be responsible for the strong reduction of the photoluminescence at ≈400 nm and the increased emission at ≈600 nm in TU and TUR. The findings suggest that urea- and RhB-capped TiO2 NPs could have potential applications as photocatalysts, opto-electronic devices, sensors, biological labels and anti-bacterial agents. |
| Freie Schlagworte: | Ceramics, Organic compounds, Optical properties, Luminescence |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 07 Jun 2016 08:25 |
| Letzte Änderung: | 27 Sep 2017 08:33 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum