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Article
Three-dimensional finite-difference modeling of time-domain electromagnetic responses for a large-loop source
The time-domain/transient electromagnetic (TEM) method employs an alternating magnetic field that is established by passing a bidirectional pulsed current through a transmitter loop. A large wire loop on or ab...
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Article
Dosimetric optimization of a truncated conical-shaped transmission target for electronic brachytherapy X-ray source: A Monte Carlo study
The purpose of this study is to determine the optimal target configurations to improve the uniformity of dose distribution for the electronic brachytherapy source. A truncated conical-shaped transmission type ...
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Article
Open AccessFabrication of Uniform Nanoporous Oxide Layers on Long Cylindrical Zircaloy Tubes by Anodization Using Multi-Counter Electrodes
We have presented a method to prepare a uniform anodic nanoporous oxide film on the surface of a cylindrical zircaloy (Zr) tube. The distribution of the electric field around the Zr tube determines the distrib...
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Article
Open AccessControlled Fabrication of Nanoporous Oxide Layers on Zircaloy by Anodization
We have presented a mechanism to explain why the resulting oxide morphology becomes a porous or a tubular nanostructure when a zircaloy is electrochemically anodized. A porous zirconium oxide nanostructure is ...
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Article
Open AccessSynthesis of flake-like graphene from nickel-coated polyacrylonitrile polymer
Graphene can be synthesized from polyacrylonitrile (PAN) polymer through pyrolysis. A metal catalyst such as nickel (Ni) is required for the conversion of the polymer to graphene. The metal catalysts can be pl...
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Article
Open AccessFormation of self-organized Zircaloy-4 oxide nanotubes in organic viscous electrolyte via anodization
This work reports the formation of self-organized Zircaloy-4 (Zr-4) oxide nanotubes in viscous organic ethylene glycol (EG) electrolyte containing a small amount of fluoride salt and deionized (DI) water via a...
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Article
Open AccessTuning electronic and magnetic properties of partially hydrogenated graphene by biaxial tensile strain: a computational study
Using density functional theory calculations, we have investigated the effects of biaxial tensile strain on the electronic and magnetic properties of partially hydrogenated graphene (PHG) structures. Our study...
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Article
Open AccessLiFePO4 microcrystals as an efficient heterogeneous Fenton-like catalyst in degradation of rhodamine 6G
We present a novel heterogeneous Fenton-like catalyst of LiFePO4 (LFP). LFP has been widely used as an electrode material of a lithium ion battery, but we observed that commercial LFP (LFP-C) could act as a good ...
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Article
Open AccessEnhancement of antireflection property of silicon using nanostructured surface combined with a polymer deposition
Silicon (Si) nanostructures that exhibit a significantly low reflectance in ultraviolet (UV) and visible light wavelength regions are fabricated using a hydrogen etching process. The fabricated Si nanostructur...
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Article
Open AccessHighly stable carbon nanotube field emitters on small metal tips against electrical arcing
Carbon nanotube (CNT) field emitters that exhibit extremely high stability against high-voltage arcing have been demonstrated. The CNT emitters were fabricated on a sharp copper tip substrate that produces a h...
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Article
Enhancement of electrical conductivity and dielectric constant in Sn-doped nanocrystlline CoFe2O4
We have investigated the dielectric constant and capacitance of pure and tin-doped cobalt ferrite nanoparticles. The nanoparticles with spinel structure were synthesized by chemical co-precipitation method. Th...
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Article
Formation of hierarchical TiO2 nanoporous structure from free-standing TiO2 nanotubes layers
Hierarchical TiO2 nanoporous structures with tailored porosity have been fabricated by simply annealing of free-standing TiO2 nanotubes (TNTs) layers in the presence of in situ trapped F-species. The hierarchical...
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Article
Open AccessA vacuum-sealed miniature X-ray tube based on carbon nanotube field emitters
A vacuum-sealed miniature X-ray tube based on a carbon nanotube field-emission electron source has been demonstrated. The diameter of the X-ray tube is 10 mm; the total length of the tube is 50 mm, and no exte...
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Article
Patterning of gold nano-octahedra using electron irradiation combined with thermal treatment and post-cleaning process
A novel approach to pattern nanocrystalline gold (Au) octahedra is presented based on electron irradiation combined with thermal treatment and post-cleaning process using HAuCl4-loaded poly(styrene-b-2-vinyl pyri...
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Article
Open AccessImprovement in the photoelectrochemical responses of PCBM/TiO2 electrode by electron irradiation
The photoelectrochemical (PEC) responses of electron-irradiated [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM)/TiO2 electrodes were evaluated in a PEC cell. By coating PCBM on TiO2 nanoparticle film, the ligh...
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Article
Open AccessTuning the electronic band structure of PCBM by electron irradiation
Tuning the electronic band structures such as band-edge position and bandgap of organic semiconductors is crucial to maximize the performance of organic photovoltaic devices. We present a simple yet effective ...
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Article
Open AccessImproved conversion efficiency of Ag2S quantum dot-sensitized solar cells based on TiO2 nanotubes with a ZnO recombination barrier layer
We improve the conversion efficiency of Ag2S quantum dot (QD)-sensitized TiO2 nanotube-array electrodes by chemically depositing ZnO recombination barrier layer on plain TiO2 nanotube-array electrodes. The optica...
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Article
Open AccessFabrication of complete titania nanoporous structures via electrochemical anodization of Ti
We present a novel method to fabricate complete and highly oriented anodic titanium oxide (ATO) nano-porous structures with uniform and parallel nanochannels. ATO nano-porous structures are fabricated by anodi...
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Article
Open AccessStable Field Emitters for a Miniature X-ray Tube Using Carbon Nanotube Drop Drying on a Flat Metal Tip
Stable carbon nanotube (CNT) field emitters for a vacuum-sealed miniature X-ray tube have been fabricated. The field emitters with a uniform CNT coating are prepared by a simple drop drying of a CNT mixture so...
