Fabrication and Luminescence Properties of Y2O3:Eu3+/AAO Composite

2012 ◽  
Vol 583 ◽  
pp. 199-202
Author(s):  
Su Wen Li ◽  
Shu Guang Ju
Keyword(s):  
Anodic Aluminum Oxide ◽  
Annealing Temperature ◽  
Anodic Aluminum Oxide Template ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anodic Aluminum ◽  
Local Environments ◽  
Spectral Components ◽  
The Eu

Uniform Eu3+ doped Y2O3 nanowires with diameters of 50 nm in the anodic aluminum oxide template (AAO) have been fabricated. The Y2O3:Eu3+/AAO composite nanowires were characterized by using powder X-ray diffraction (XRD), scanning electron microscope (SEM) and spectrofluorometer techniques. The results indicate that with the increasing annealing temperature and time the excitation band of Eu3+ in Y2O3: Eu3+/AAO composite blue shifted, the intensity ratio of 5D0-7F2 to 5D0-7F1 decreased and the lifetime of the Eu3+ ions in composite became longer. In the composite annealed at 1000 °C, two spectral components were detected, corresponding to two different local environments, i.e. the Eu3+ ions in cubic phase and in amorphous phase, respectively.

Fabrication and Photoluminescent Properties of Gd2O3: Eu3+ Nanowires in AAO Template

2007 ◽  
Vol 7 (2) ◽  
pp. 474-480 ◽  
Author(s):  
Suwen Li ◽  
Hongwei Song ◽  
Lixin Yu ◽  
Zhongxin Liu ◽  
Guohui Pan ◽  
...  
Keyword(s):  
Amorphous Phase ◽  
Annealing Temperature ◽  
Composite Films ◽  
Anodic Aluminum Oxide Template ◽  
Cubic Phase ◽  
Spectral Measurements ◽  
Anodic Aluminum ◽  
Local Environments ◽  
Spectral Components ◽  
The Eu

Uniform Gd2O3: Eu3+ nanowires were fabricated by using anodic aluminum oxide template (AAO). The spectral measurements indicate that with the increasing annealing temperature the excitation band of Eu3+ in Gd2O3 : Eu3+ nanowires/AAO shifted blue, the intensity ratio of 5D0–7F2 to 5D0–7F1 decreased, and the lifetime became longer. In the sample annealed at 1000°C two spectral components, the sharper and broader lines were identified, corresponding to two different local environments, the Eu3+ ions in cubic phase and in amorphous phase, respectively. The 5D0–7F1 transitions of Eu3+ ions in cubic phase had longer lifetime than that in amorphous phase. In contrast to the lifetime of the 5D0–7FJ transitions in the bulk, that in Gd2O3 : Eu3+/AAO composite films increased due to influence of the surrounding media (AAO).

Fabrication and Photoluminescent Properties of Gd2O3: Eu3+ Nanowires in AAO Template

2007 ◽  
Vol 7 (2) ◽  
pp. 474-480
Author(s):  
Suwen Li ◽  
Hongwei Song ◽  
Lixin Yu ◽  
Zhongxin Liu ◽  
Guohui Pan ◽  
...  
Keyword(s):  
Amorphous Phase ◽  
Annealing Temperature ◽  
Composite Films ◽  
Anodic Aluminum Oxide Template ◽  
Cubic Phase ◽  
Spectral Measurements ◽  
Anodic Aluminum ◽  
Local Environments ◽  
Spectral Components ◽  
The Eu

Uniform Gd2O3: Eu3+ nanowires were fabricated by using anodic aluminum oxide template (AAO). The spectral measurements indicate that with the increasing annealing temperature the excitation band of Eu3+ in Gd2O3 : Eu3+ nanowires/AAO shifted blue, the intensity ratio of 5D0–7F2 to 5D0–7F1 decreased, and the lifetime became longer. In the sample annealed at 1000°C two spectral components, the sharper and broader lines were identified, corresponding to two different local environments, the Eu3+ ions in cubic phase and in amorphous phase, respectively. The 5D0–7F1 transitions of Eu3+ ions in cubic phase had longer lifetime than that in amorphous phase. In contrast to the lifetime of the 5D0–7FJ transitions in the bulk, that in Gd2O3 : Eu3+/AAO composite films increased due to influence of the surrounding media (AAO).

Photoluminescent Properties of Y2O3:Tb3+ Nanowires in AAO

2013 ◽  
Vol 760-762 ◽  
pp. 821-824
Author(s):  
Su Wen Li ◽  
Ming Yue
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Anodic Aluminum Oxide ◽  
Annealing Temperature ◽  
Anodic Aluminum Oxide Template ◽  
Spectral Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anodic Aluminum ◽  
Scanning Electron

Uniform Y2O3:Tb3+nanowires with diameters of about 70 nm were fabricated using the anodic aluminum oxide template (AAO). The Y2O3:Tb3+nanowires and Y2O3:Tb3+/AAO composite were characterized by using powder X-ray diffraction (XRD), scanning electron microscope (SEM) and spectrofluorometer techniques. The Y2O3:Tb3+nanowires are amorphous phase in symmetry as the annealing temperature was lower than 1000 °C. And the cubic Y2O3: Tb3+nanowires were formed partly as the annealing temperature approached to 1000 °C. The spectral measurements indicate that the excitation and emission intensity increased with the increasing annealing temperature as well as annealing time. The lifetime of5D4-7F5transition becomes longer with the increasing annealing temperature and time in Y2O3:Tb3+/AAO composite.

Fabrication of ordered Ta2O5 nanodots using an anodic aluminum oxide template on Si substrate

2007 ◽  
Vol 22 (4) ◽  
pp. 1064-1071 ◽  
Author(s):  
Ching-Jung Yang ◽  
Chih Chen ◽  
Pu-Wei Wu ◽  
Jia-Min Shieh ◽  
Shun-Min Wang ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Photoelectron Spectroscopy ◽  
Anodic Aluminum Oxide ◽  
Anodic Aluminum Oxide Template ◽  
X Ray Diffraction ◽  
General Applicability ◽  
X Ray ◽  
Anodic Aluminum ◽  
Transmission Electron ◽  
Anodization Process

Ordered arrays of Ta2O5 nanodots were prepared using anodic aluminum oxide (AAO) as a template to support localized oxidation of TaN. Films of TaN (50 nm) and Al (1.5 μm) were deposited successively on p-type Si wafers and followed by a two-step anodization process at 40 V using oxalic acid as the electrolyte. The first anodization promoted growth of irregular AAO from overlying Al film. After chemical etching, the second anodization was performed to develop well-organized AAO channels and initiate oxidation of underlying TaN film to form tantalum oxide nanodots at the AAO pore bottoms. X-ray photoelectron spectroscopy results confirmed the chemical nature of nanodots as stoichmetric Ta2O5. X-ray diffraction demonstrated the amorphous characteristic of Ta2O5. As shown in field-emission scanning electron microscopy and transmission electron results, the Ta2O5 nanodots exhibited a hillock structure 80 nm in diameter at the bottom and 50 nm in height. We also synthesized 30-nm nanodots by adjusting AAO formation electrochemistry. This demonstrates the general applicability of the AAO template method for nanodot synthesis from nitride to oxide at a desirable size.

Preparation of AgBr Nanowire Arrays in Porous Anodic Aluminium Oxide Template by Paired Cell Deposition

2013 ◽  
Vol 539 ◽  
pp. 255-258
Author(s):  
Miao Miao Cui ◽  
Xiu Chun Yang ◽  
Jun Wei Hou
Keyword(s):  
Anodic Aluminum Oxide ◽  
Average Diameter ◽  
Anodic Aluminum Oxide Template ◽  
Nanowire Arrays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anodic Aluminum ◽  
Anodization Process ◽  
Face Centered ◽  
Paired Cell

Firstly, porous anodic aluminum oxide template was prepared by a two-step anodization process, then AgBr nanowire arrays were successfully synthesized by paired cell deposition. X-ray diffraction (XRD) indicates that the as-synthesized samples are composed of face-centered AgBr. Field-emission scanning electron microscopy (FESEM) shows that the average diameter of the nanowire arrays is about 70nm.

Template Synthesis of Indium Nanowires Using Anodic Aluminum Oxide Membranes

2008 ◽  
Vol 8 (9) ◽  
pp. 4488-4493 ◽  
Author(s):  
Feng Chen ◽  
Adrian H. Kitai
Keyword(s):  
Aluminum Oxide ◽  
Template Synthesis ◽  
Anodic Aluminum Oxide ◽  
Preferred Orientation ◽  
Hydraulic Pressure ◽  
X Ray Diffraction ◽  
Aao Template ◽  
X Ray ◽  
Anodic Aluminum ◽  
Oxide Membranes

Indium nanowires with diameters approximately 300 nm have been synthesized by a hydraulic pressure technique using anodic aluminum oxide (AAO) templates. The indium melt is injected into the AAO template and solidified to form nanostructures. The nanowires are dense, continuous and uniformly run through the entire ∼60 μm thickness of the AAO template. X-ray diffraction (XRD) reveals that the nanowires are polycrystalline with a preferred orientation. SEM is performed to characterize the morphology of the nanowires.

scholarly journals Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
C. R. García ◽  
L. A. Diaz-Torres ◽  
J. Oliva ◽  
M. T. Romero ◽  
P. Salas
Keyword(s):  
Photocatalytic Activity ◽  
Annealing Temperature ◽  
Uv Light ◽  
Solar Irradiation ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Water Cleaning ◽  
Different Temperatures ◽  
The Eu

Blue phosphorescent strontium aluminosilicate powders were prepared by combustion synthesis route and a postannealing treatments at different temperatures. X-ray diffraction analysis showed that phosphors are composed of two main hexagonal phases: SrAl2O4and Sr3Al32O51. The morphology of the phosphors changed from micrograins (1000°C) to a mixture of bars and hexagons (1200°C) and finally to only hexagons (1300°C) as the annealing temperature is increased. Photoluminescence spectra showed a strong blue-green phosphorescent emission centered atλem=455 nm, which is associated with4f65d1→4f6  (8S7/2)transition of the Eu2+. The sample annealed at 1200°C presents the highest luminance value (40 Cd/m2) with CIE coordinates (0.1589, 0.1972). Also, the photocatalytic degradation of methylene blue (MB) under UV light (at 365 nm) was monitored. Samples annealed at 1000°C and 1300°C presented the highest percentage of degradation (32% and 38.5%, resp.) after 360 min. In the case of photocatalytic activity under solar irradiation, the samples annealed at 1000°C, 1150°C, and 1200°C produced total degradation of MB after only 300 min. Hence, the results obtained with solar photocatalysis suggest that our powders could be useful for water cleaning in water treatment plants.

In Situ Template Synthesis of TiO2 Nanotube Array Films

2007 ◽  
Vol 336-338 ◽  
pp. 2200-2202 ◽  
Author(s):  
Wu Feng Jiang ◽  
Yun Han Ling ◽  
Su Ju Hao ◽  
Hong Yi Li ◽  
Xin De Bai ◽  
...  
Keyword(s):  
Anodic Aluminum Oxide ◽  
Treatment Condition ◽  
Liquid Phase Deposition ◽  
X Ray Diffraction ◽  
Nanotube Array ◽  
X Ray ◽  
Anodic Aluminum ◽  
The Mean ◽  
Scanning Electron

Anodic aluminum oxide (AAO) is commonly used as a starting template for fabrication of several kinds of functional nanoscale devices due to its homogeneous nanohole structure with high aspect ratio. In this paper, high density and uniform titanium dioxide nanotube array films were prepared via liquid phase deposition method by immersing the AAO templates in an aqueous ammonium hexafluorotitanate solution. The phase and microstructure of the nanotube array films were characterized by X-ray diffraction and field-emission scanning electron microscopy. It was found that the mean inner diameters of nanotube are 40-100 nm, mainly depended on different templates and post treatment condition; the phase of as-deposited TiO2 array film was amorphous, while it became anatase at above 400°C.

TEMPLATE SYNTHESIS OF ALIGNED SiO2 SUBMICRO-WIRES

2006 ◽  
Vol 05 (02n03) ◽  
pp. 273-278
Author(s):  
LIFANG CHENG ◽  
XINGTANG ZHANG ◽  
YUNCAI LI ◽  
YABIN HUANG ◽  
ZULIANG DU
Keyword(s):  
Electron Microscopy ◽  
Silicon Dioxide ◽  
Photoelectron Spectroscopy ◽  
Anodic Aluminum Oxide ◽  
Tetraethyl Orthosilicate ◽  
X Ray Diffraction ◽  
Aao Template ◽  
X Ray ◽  
Anodic Aluminum ◽  
Transmission Electron

Aligned silicon dioxide ( SiO 2) submicro-wires have been synthesized from tetraethyl orthosilicate (TEOS) by anodic aluminum oxide (AAO) template method. The products were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and X-ray diffraction (XRD).

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