SYNTHESIS AND LUMINESCENCE PROPERTIES OF ZnO:Eu3+ NANOWIRE ARRAYS VIA ELECTRODEPOSITED METHOD

2010 ◽  
Vol 03 (04) ◽  
pp. 285-288 ◽  
Author(s):  
SHIHUA ZHAO ◽  
LEI YANG ◽  
LINGLING WANG ◽  
BENHAI YU ◽  
YUXI CHEN ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Growth Direction ◽  
Nanowire Arrays ◽  
Sem Images ◽  
Alumina Membranes ◽  
Transmission Electron ◽  
Preferential Growth Direction ◽  
Zno Crystal ◽  
The Fourier Transform ◽  
Xrd Patterns

ZnO:Eu3+ nanowire arrays (NWAs) were prepared using anodic alumina membranes (AAMs) via an electrodeposited method. The XRD patterns, high resolution transmission electron microscopy (HRTEM) and infrared absorption spectra indicate that Eu3+ has entered ZnO crystal lattice. SEM images show that the as-prepared NWAs were embedded in Al2O3 nanotube arrays (NTAs) and the uniform diameters of those nanowires are about 80 nm. The Fourier Transform pattern of the HRTEM shows that the NWAs are single crystals with preferential growth direction along the [0001]. The PL spectra show that the ratio of relative emission intensity of 612 and 597 nm increases with the increase of dopant concentration of Eu3+ . There is no emission peak at 597 nm with the dopant concentration of 10% Eu3+ . The PL results also show that a new UV emission band centered at 306 nm appears.

scholarly journals Structural Studies and Optical and Electrical Properties of Novel -Doped Nanorods

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Abdolali Alemi ◽  
Younes Hanifehpour ◽  
Sang Woo Joo ◽  
Bong-Ki Min ◽  
Tae Hwan Oh
Keyword(s):  
Electrical Conductance ◽  
Emission Spectra ◽  
Growth Direction ◽  
Electron Microscopic ◽  
Sem Images ◽  
Dopant Content ◽  
Cell Parameters ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Doped Nanomaterials

Gd3+-doped Sb2Se3nanorods were synthesized by coreduction method at 180°C and for 48 h. Powder XRD patterns indicate that the Se3crystals (–0.04) are isostructural with Sb2Se3. The cell parametersaandbincrease for Gd3+upon increasing the dopant content (x), whilecdecreases. SEM images show that doping of Gd3+ions in the lattice of Sb2Se3results in nanorods. High-resolution transmission electron microscopic (HRTEM) studies reveal that the Gd0.04Sb1.96Se3is oriented in the [10-1] growth direction. UV-Vis absorption reveals mainly electronic transitions of the Gd3+ions in doped nanomaterials. Emission spectra of doped materials show sharp emission band originating from f-f transition of the Gd3+ions. The electrical conductance of Gd-doped Sb2Se3is higher than undoped Sb2Se3and increases with temperature.

Control of Crystal Orientation of Epitaxial Si nanowires on Si Substrate Using AAO template

2011 ◽  
Vol 1350 ◽  
Author(s):  
Tomohiro Shimizu ◽  
Qi Wang ◽  
Chonge Wang ◽  
Fumihiro Inoue ◽  
Makoto Koto ◽  
...  
Keyword(s):  
Crystal Orientation ◽  
Growth Direction ◽  
Nanowire Arrays ◽  
Si Nanowires ◽  
Aao Template ◽  
Si Substrate ◽  
Anodic Aluminum ◽  
Transmission Electron ◽  
Growth Method ◽  
Vls Growth

ABSTRACTControl of crystal orientation of vertically grown epitaxial Si (111) and (110) nanowire arrays on Si substrate has been demonstrated using a combination of an anodic aluminum oxide (AAO) template and vapor – liquid – solid (VLS) growth method. The crystal orientation of the nanowire was investigated by transmission electron microscopy. A growth direction of the nanowire arrays was guided perpendicular to the surface of the substrate by the AAO template, and the crystal orientation of the nanowire arrays was selected using the single crystal Si substrate properly cut in desired orientation.

Single-Crystal Iron Nanowire Arrays

2007 ◽  
Vol 121-123 ◽  
pp. 17-20 ◽  
Author(s):  
Yue Ling Sun ◽  
Ying Dai ◽  
L.Q. Zhou ◽  
Wen Chen
Keyword(s):  
Electron Microscope ◽  
Single Crystal ◽  
Hysteresis Loops ◽  
Nanowire Arrays ◽  
X Ray Diffraction ◽  
Easy Magnetization ◽  
Transmission Electron ◽  
Iron Nanowires ◽  
Xrd Patterns ◽  
Different Diameters

Highly ordered single-crystal iron nanowire arrays with different diameters have been fabricated in anodic aluminum oxide (AAO) templates by DC electrodeposition method. The Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) show that the iron nanowires are highly uniform and exhibit a single crystal structure. The X-ray diffraction (XRD) patterns of iron nanowire arrays indicate that most of the iron nanowire arrays have the obvious preferred orientation along the [200] direction. From the hysteresis loops of the iron nanowires, it reveals that the easy magnetization axes of nanowire arrays are along the long axis. The sample with smaller diameter (d=35nm) has a high square ratio (up to 98%) and a high coercive filed (1265Oe) when the external magnetic field is applied along axis of the nanowires. When the diameter decreases, the square ratio and the coercive field increase due to the single-domain structure and the strong shape anisotropy in the smaller diameter nanowire arrays.

Novel Zn-Doped SnO2 Hierarchical Architectures: Facile Synthesis, Structural Characterization and Enhanced Photocatalytic Property

2012 ◽  
Vol 512-515 ◽  
pp. 334-338 ◽  
Author(s):  
Tie Kun Jia ◽  
Fan Zhang ◽  
Xiao Feng Wang ◽  
Wei Min Wang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photocatalytic Activity ◽  
Mixed Solvents ◽  
Photocatalytic Property ◽  
Growth Direction ◽  
High Photocatalytic Activity ◽  
Transmission Electron ◽  
Preferential Growth Direction ◽  
Hierarchical Architectures

Zn-doped SnO2 seaflower like hierarchical architectures have been synthesized via a solvothermal synthesis route in the mixed solvents of ethanol and deionized water. The observations of field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) showed that Zn-doped SnO2 seaflower like hierarchical architectures were assembled by the nanowires. The preferential growth direction of nanowires was determined based on the analysis of high resolution transmission electron microscopy (HRTEM). The products were also characterized by X-ray diffraction (XRD) and X-photoelectron spectrum (XPS), and the results indicated that Sn4+ ions were successfully substituted by Zn2+. The photocatalytic activity of Zn-doped SnO2 seaflower like hierarchical architectures was evaluated by the degradation of RhB aqueous solution and the results showed that the product had high photocatalytic activity efficiency.

Synthesis of RePO4 (Re=La, Nd, Pr, or Y) Nanowires by Chemical Precipitation in Nanochannels

2011 ◽  
Vol 181-182 ◽  
pp. 495-500 ◽  
Author(s):  
Cheng Mu ◽  
Jun Hui He
Keyword(s):  
Rare Earth ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Aao Template ◽  
Sem Images ◽  
Transmission Electron ◽  
Rare Earth Phosphate ◽  
Xrd Patterns ◽  
Uniform Diameter

Monodisperse nanowires of rare earth phosphates were synthesized by chemical precipitation method using anodic aluminum oxide (AAO) template. Scanning electron microscope (SEM) images indicated that rare earth phosphate nanowires are parallelly arranged in AAO template, all of which are in uniform diameter of about 50 nm. X-ray diffraction (XRD) patterns and high magnification transmission electron microscopy (HRTEM) images showed that the nanowires were polycrystal structure.

ANISOTROPIC GOLD NANOCRYSTALS: SYNTHESIS AND CHARACTERIZATION

2010 ◽  
Vol 24 (06n07) ◽  
pp. 757-761 ◽  
Author(s):  
R. STIUFIUC ◽  
F. TODERAS ◽  
M. IOSIN ◽  
G. STIUFIUC
Keyword(s):  
Growth Direction ◽  
Preferential Growth ◽  
Gold Nanocrystals ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Preferential Growth Direction ◽  
Phase Images ◽  
Means Of Transmission

In this letter we report on successful preparation and characterization of anisotropic gold nanocrystals bio-synthesized by reduction of aqueous chloroaurate ions in pelargonium plant extract. The nanocrystals have been characterized by means of Transmission Electron Microscopy (TEM), UV-VIS absorption spectroscopy and tapping mode atomic force microscopy (TM-AFM). Using these investigation techniques, the successful formation of anisotropic single nanocrystals with the preferential growth direction along the gold (111) plane has been confirmed. The high detail phase images could give us an explanation concerning the growth mechanism of the nanocrystals.

scholarly journals Templated Fabrication of InSb Nanowires for Nanoelectronics

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
M. Ibrahim Khan ◽  
Xu Wang ◽  
Krassimir N. Bozhilov ◽  
Cengiz S. Ozkan
Keyword(s):  
Electron Microscopy ◽  
Pore Diameter ◽  
Anodic Alumina ◽  
Nanowire Arrays ◽  
Alumina Membrane ◽  
Structure Defects ◽  
Alumina Membranes ◽  
Transmission Electron ◽  
Ordered Nanostructures ◽  
Insb Nanowires

Among various ways to produce nanowires, anodic alumina membrane- (AAM-) based synthesis has constantly received much attention, because AAM has a uniform and parallel porous nanostructure which makes it an ideal template material for fabricating highly ordered nanostructures. In this paper, we report fabrication of InSb nanowire arrays with diameter of 200 nm and 30 nm by direct current electrodeposition inside the nanochannels of anodic alumina membranes without subsequent annealing. The nanowires have four major growth directions, (220) being the most dominant with structure defects such as twins. The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results demonstrate that these InSb nanowires are uniform with diameters about 200 nm and 30 nm, corresponding to the pore diameter of the AAMs. The I-V measurement of a single nanowire is also reported with encouraging preliminary results.

Fabrication of highly ordered ZnO nanowire arrays in anodic alumina membranes

2000 ◽  
Vol 15 (11) ◽  
pp. 2305-2308 ◽  
Author(s):  
Y. Li ◽  
G. S. Cheng ◽  
L. D. Zhang
Keyword(s):  
Green Emission ◽  
Anodic Alumina ◽  
Zno Nanowires ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Green Emission Band ◽  
Alumina Membranes ◽  
Atomic Force ◽  
Zno Nanowire Arrays ◽  
Transmission Electron

Highly ordered ZnO nanowire arrays were fabricated by oxidizing the metal Zn that was electrodeposited in the pores of anodic alumina membranes (AAMs). The diameters of ZnO nanowires range from 15 to 90 nm. Atomic force microscope, x-ray diffraction, and transmission electron microscopy observations indicate the polycrystalline ZnO nanowires were uniformly assembled into the hexagonally-arranged nanochannels of the AAM. A green emission band caused by the singly ionized oxygen vacancy in the ZnO nanowires was also reported.

Electrochemical Fabrication of InSb Nanowires using Porous Alumina Membrane and their Characterization

2008 ◽  
Vol 1080 ◽  
Author(s):  
Muhammad Ibrahim Khan ◽  
Xu Wang ◽  
Krassimir N. Bozhilov ◽  
Cengiz S. Ozkan
Keyword(s):  
Electron Microscopy ◽  
Porous Alumina ◽  
Growth Direction ◽  
Anodic Alumina ◽  
Alumina Membrane ◽  
Alumina Membranes ◽  
Transmission Electron ◽  
Dependent Behavior ◽  
Conductivity Increase ◽  
Insb Nanowires

ABSTRACTAmong various ways to produce nanowires; anodic alumina membrane (AAM) based synthesis has constantly received much attention because AAM possess a uniform and parallel porous structure which makes them an ideal template material for creating highly ordered nanostructures. In this paper we report fabrication of InSb nanowire arrays with diameter of 200 nm and 30 nm by direct current electrodeposition inside the nanochannels of anodic alumina membranes without subsequent annealing. The nanowires have four major growth direction, [220] being the most dominant with structure defects such as twins. The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results demonstrate that these InSb nanowires are uniform with diameters about 200 nm and 30 nm, corresponding to the pore diameter of the AAMs. The nanowires also conduct almost no current in the dark, but when hit with light, they conduct 10,000 times more current. This photoconduction property could lead to a variety of tiny optoelectronic devices potentially useful in future generations of nanoelectronics and chemical sensors. The light-induced conductivity increase and the temperature dependent behavior of the nanowires are also reported.

Highly Ordered and Well-oriented Single-crystal CdTe Nanowire Arrays by Direct-current Electrodeposition

2002 ◽  
Vol 17 (7) ◽  
pp. 1711-1714 ◽  
Author(s):  
Dongsheng Xu ◽  
Yuguo Guo ◽  
Dapeng Yu ◽  
Guolin Guo ◽  
Youqi Tang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Single Crystal ◽  
High Resolution Electron Microscopy ◽  
Growth Direction ◽  
Nanowire Arrays ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Anodic Aluminum Oxide Templates ◽  
Oriented Single Crystal

Highly ordered CdTe nanowire arrays were prepared by electrochemical deposition into the pores of anodic aluminum oxide templates from an ethylene glycol bath containing CdCl2, TeCl4, and KI. Electron microscopy results showed that the length, diameter, and direction of growth of the nanowires were quite uniform. X-ray diffraction, transmission electron microscopy, and high-resolution electron microscopy investigations showed that these nanowires had a crystalline structure of hexagonal CdTe single crystal with a uniform [001] growth direction.

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