Enabling high solubility of ZnO in TiO2 by nanolamination of atomic layer deposition.
Nanoscale
; 7(45): 19222-30, 2015 Dec 07.
Article
en En
| MEDLINE
| ID: mdl-26526381
ABSTRACT
Zn-doped TiO2 nanotubes were fabricated by nanolaminated packing of alternating layers of TiO2 and ZnO by atomic layer deposition (ALD) using a polycarbonate (PC) membrane as a template. With 400 cycles of ALD, the nanotubes with a thickness of 28 nm and an outer diameter of 220 nm were obtained after removing the PC membrane by annealing at 450 °C. The doping concentration of ZnO in TiO2 depends on the precursor cycle ratio of ZnO to TiO2. With the precursor cycle ratio of ZnO TiO2 at 0.04, a uniform bulk solubility of â¼8 at% is obtained, and the surface concentration of Zn is even higher, â¼16 at%. From the depth profiles measured by secondary ion mass spectrometry, Zn is uniformly distributed across the thickness, which is further confirmed by analyses of X-ray photoelectron spectroscopy, X-ray diffraction, and Raman spectroscopy. Additionally, from the transmission electron microscopic observation, the highly doped anatase TiO2 exhibits some regions of severe deformation that results in localized solid-state amorphization.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Nanoscale
Año:
2015
Tipo del documento:
Article
País de afiliación:
Taiwán