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.

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.

SYNTHESIS OF In2O3 NANOWIRES ENHANCED BY ANODIC ALUMINA MEMBRANE

2006 ◽  
Vol 05 (04n05) ◽  
pp. 479-485
Author(s):  
C. W. LAI ◽  
X. Y. ZHANG ◽  
H. C. ONG ◽  
J. Y. DAI ◽  
H. L. W. CHAN
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Anodic Alumina ◽  
X Ray Diffraction ◽  
Alumina Membrane ◽  
Thermal Evaporation Method ◽  
Single Crystalline ◽  
X Ray ◽  
Alumina Membranes ◽  
Transmission Electron

Large-scale single crystalline In 2 O 3 nanowires were successfully synthesized on anodic alumina membranes by a simple thermal evaporation method at 570°C. X-ray diffraction, transmission electron microscopy, and scanning electron microscopy studies revealed the formation of single crystalline In 2 O 3 nanowires with diameters of 50–100 nm and lengths of up to a few hundreds of micrometers. Cathodeluminescence study revealed existence of oxygen vacancies evidenced by a strong and broad emission at 470 nm with a shoulder at 400 nm. The growth mechanism of the nanostructures is also discussed.

Fabrication, characterization, and photoluminescence properties of highly ordered TiO2 nanowire arrays

2001 ◽  
Vol 16 (4) ◽  
pp. 1138-1144 ◽  
Author(s):  
Y. Lei ◽  
L. D. Zhang
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Broad Band ◽  
Anodic Alumina ◽  
Nanowire Arrays ◽  
Photoluminescence Properties ◽  
Alumina Membrane ◽  
Tio2 Nanowire ◽  
Alumina Membranes ◽  
Center Area

Highly ordered TiO2 nanowire arrays were prepared in anodic alumina membranes by a sol-gel method. The nanowires are single-crystalline anatase phase with uniform diameters around 50 nm. At room temperature, photoluminescence (PL) measurements of these TiO2 nanowire arrays showed a visible broad band with three peaks, which were located at about 425, 460, and 530 nm that are attributed to self-trapped excitons, F, and F+ centers, respectively. A model is also presented to explain the PL intensity drop-down of the TiO2 nanowire arrays embedded in the alumina membrane: the blue PL band of the anodic alumina membranes arises from the F+ centers on the pore walls, and the TiO2 nanowires first form in the center area of the pores and then extend to the pore walls.

SYNTHESIS OF ZnO NANOTUBE ARRAYS BY ANNEALING Zn NANOWIRE ARRAYS IN ANODIC ALUMINA MEMBRANE

2009 ◽  
Vol 23 (08) ◽  
pp. 1063-1068 ◽  
Author(s):  
GUAN-LAI LI ◽  
XIAO-NIU PENG ◽  
MENG-YIN XIE ◽  
LIAO YU ◽  
LI ZHOU
Keyword(s):  
Electron Microscopy ◽  
Treatment Method ◽  
Nanowire Arrays ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Alumina Membrane ◽  
Anodic Aluminum ◽  
Zno Nanotube ◽  
Transmission Electron ◽  
Heat Treatment Method

Uniform and aligned ZnO nanotube arrays have been synthesized by annealing Zn nanowire arrays in anodic aluminum oxide (AAO) membrane. In our method, Zn nanowire arrays were fabricated by electrochemical deposition technique based on ordered nanoporous AAO, and then a heat-treatment method was used to convert Zn nanowire arrays to ZnO nanotube arrays. The ZnO arrays were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and absorption spectra. The results show that the polycrystalline ZnO nanotubes have a diameter of about 45 nm. This method can also be used to fabricate other metal oxide nanotube arrays.

Electrochemical Fabrication of BixTe1-x (0.4 ≤ x ≤ 0.7) Nanowire Arrays

2007 ◽  
Vol 546-549 ◽  
pp. 2171-2174
Author(s):  
Wei Wang ◽  
J.F. Qu ◽  
X.L. Lu ◽  
G.Q. Zhang ◽  
Guang Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Atomic Ratio ◽  
Nanowire Arrays ◽  
X Ray Diffraction ◽  
Alumina Membrane ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Electrochemical Fabrication

Large scale and highly ordered thermoelectric BixTe1-x (0.4 ≤ x ≤ 0.7) nanowire arrays were successfully fabricated by cathodic electrolysis into porous anodic alumina membrane (AAM) templates in aqueous solution. The structure of the nanowires was characterized by X-ray diffraction and selected-area electron diffraction (SAED). Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) results show that the nanowires are smooth and uniform with the diameters of about 50 nm and lengths up to tens of micrometers. Energy dispersive spectroscopy (EDS) was used to check the exact stoichiometry of as-prepared samples. The results reveal that the atomic ratio between Bi and Te can be modulated effectively by controlling the concentration of the electrolyte solution. The synthesis of high quality BixTe1-x nanowires with controllable x is significant for optimizing the thermoelectric performance.

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.

scholarly journals Study on the Influence of Porous Anodic Alumina Membrane on Separation of Hydrogen and Methane

2013 ◽  
Vol 652-654 ◽  
pp. 362-366
Author(s):  
Qi Peng Yang ◽  
Xue Bo Zhao ◽  
Xiu Lin Wang
Keyword(s):  
Electron Microscopy ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Anodic Alumina Membrane ◽  
Alumina Membrane ◽  
Separation Index ◽  
Alumina Membranes ◽  
Different Thickness ◽  
Microscopy Images ◽  
Scanning Electron

Hydrogen and methane have been regarded as the main energy for future. In recent years, membrane technology has developed to be an attractive technology to separate them. In this paper, porous anodic alumina membranes at different thickness were prepared for separation of hydrogen and methane. The thickness varied from about 77 to 250 μm, moreover, the SEM (Scanning Electron Microscopy) images show a good linear relationship between the thickness (y) and anodizing time (x), with the fitting being y = 22.56x - 36.082. Gas permeance and separation index for hydrogen and methane were measured at different conditions, such as thickness and temperature. With the thickness increased, the permeances of two gases were decreased quickly but separation index vice versa. In this research, the actual separation index changed from 1.9 to 3.2.

THE DEPENDENCE OF ALUMINA NANOWIRE FORMATION FROM POROUS ANODIC ALUMINA MEMBRANES ON THE ETCHING SOLUTION

2012 ◽  
Vol 26 (03) ◽  
pp. 1150017 ◽  
Author(s):  
JIN KYU HAN ◽  
JIN HO KWAK ◽  
YONG CHAN CHOI ◽  
SANG DON BU
Keyword(s):  
Formation Mechanism ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Morphological Properties ◽  
Alumina Membrane ◽  
Etching Solution ◽  
Membrane Filters ◽  
Alumina Membranes ◽  
Technological Developments ◽  
Selection Of

We describe variations in the structure and formation mechanism of alumina nanowires (ANWs) formed from porous anodic alumina (PAA) membranes, depending on the composition of the etching solution. Two types of ANWs were synthesized by etching PAA membranes in etching solutions containing H 3 PO 4 or NaOH . Not only did the ANW formation mechanism vary, but also the morphological properties and the surface chemical composition of the ANWs varied with the etching solution used. These results suggest that the ANW surfaces may be optimized by the appropriate selection of etching solution. The optimization of ANWs may potentially advance, for example, water purification technological developments because ANWs have, in recent studies, provided more effective filtration performances than nanoporous alumina membrane filters.

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.

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