A template-directed synthesis strategy is an ideal tool to fabricate oxide nanotubes in that their physical dimensions can be precisely controlled and monodisperse samples harvested large quantity. The wall thickness of the controllable by varying deposition conditions, length diameter tailored accordance with templates used. wealth functional materials polymorphs deposited nanotubular structures various methods. This short review article describes recent progress made field template...

Both enhancing the excitons' lifetime and ingeniously controlling spatial charge transfer are key to realization of efficiently photocatalytic artificially photosynthetic devices. Nanostructured metal/metal-oxide interfaces often exhibit improved energy conversion efficiency. Understanding surface potential changes nano-objects under light illumination is crucial in photoelectrochemical cells. Under ultraviolet (UV) illumination, here, we directly observed separation phenomena at...

We describe the spontaneous formation of composite chalcogenide materials that consist two-dimensional (2D) dispersed in bulk and their unusual charge transport properties for application hydrogen evolution reactions (HERs). When MoS

Despite huge potential of nanostructured TiO2 in many applications, the concrete understanding optical properties associated with their defect structures remains elusive to date. Here, we present a systematic study on photoluminescence (PL) characteristics anatase nanotube (TNT) arrays as function wall thicknesses (twall) and thereby grain sizes. Highly uniform TNTs were prepared by template-directed atomic layer deposition techniques, followed thermal annealing. The relative amounts...

We report, for the first time, a novel procedure fabricating multiwall anatase TiO2 nanotubes by utilizing templated atomic layer deposition synthesis in conjunction with alternating TiO2/Al2O3 nanolaminate structures.

We demonstrate a scanning near-field microwave microscope (NSMM) in the liquid environment using tuning fork shear-force feedback method to control distance between tip and sample. Only probe for NSMM is immersed water. The dry part of attached one prong quartz directly coupled high-quality dielectric resonator at an operating frequency f=4.5–5.5GHz. This independent local characteristics. amplitude was used as set point parameter liquid. To regulation system, we present images copper film...

Nanotubes of TiO2 (anatase) and their ordered arrays are emerging, promising candidates as efficient host materials in many applications such photovoltaic cells, batteries, sensors catalysts/catalytic supports, but the interplay between these structures transport properties has been reported only rarely. Monodisperse, stoichiometric nanotubes with smooth morphology controlled wall thickness were fabricated by template-directed low-temperature atomic layer deposition (ALD), followed annealing...

Biological assays often rely on “reporter labels” to enhance measurement sensitivity, for example, by incorporation of a fluorescent dye or nanoparticle into nucleic acid protein. Use labels, however, complicates sample preparation, increases assay costs, and can cause experimental artifacts interfering with thermodynamics limiting label stability. We evaluate near-field microwave imaging (NFMI) as an alternative, label-free technique molecular diagnostics. Using DNA monolayers model, NFMI...

We report visualization of three-dimensional domain structures in ferroelectric PbTiO3 (PTO) nanotubes (NTs) using piezoresponse force microscopy (PFM). The distributions the x, y, and z-axes PTO NTs were separately measured out-of in-planes at angles 0° 90° by vertical lateral PFM. obtained PFM images combined to reconstruct complex based on some basic assumptions finite element modeling. cross-sectional configurations visualized proposed approach. results can provide insight into nanostructures.

Charge decay and lateral spreading properties were characterized by modified electrostatic force microscopy (EFM) under a high vacuum at elevated temperatures. Variations in the charge profiles modeled with maximum density (ρm) distance (Δs), as extracted from EFM potential line profiles. The scaling limitation of nitride trap memory is discussed based on projected distances for holes electrons, which determined to be approximately 18 nm 12 nm, respectively, room temperature.

The thallium-doped sodium iodide [NaI(Tl)] scintillation detector is preferred as a gamma spectrometer in many fields because of its general advantages. A silicon photomultiplier (SiPM) has recently been developed and application area expanded an alternative to tubes (PMTs). It merits such low operating voltage, compact size, cheap production cost, magnetic resonance compatibility. In this study, array SiPMs used develop NaI(Tl) spectrometer. To maintain detection efficiency, commercial 2′ ×...

Self-ordered porous anodic alumina (PAA) membranes have been widely employed as a scaffold for fabricating various nanomaterials and functional nanostructures with an excellent uniformity. The self-organization processes are only found in narrow experimental windows even PAA, their formation mechanisms not fully understood yet might allow us to access hint that generally extends into other material systems. Here, we revisit the process of PAA by experimentally observing its initial stage...

Electron and hole diffusion coefficients of stoichiometric silicon nitride, rich oxynitride were evaluated from variable temperature electrostatic force microscopy (EFM) analysis. Among them, nitride is shown to have smallest coefficient although has the higher activation energy. Scaling charge trap flash towards sub-20nm regime should be accompanied by dispersion management, minimization internal electric field, adjustment retention specification.

We demonstrate a nondestructive millimeter-wave surface imaging technique using near-field scanning microscope (NSMM) with resonant standard waveguide probe at an operation frequency f=60 GHz. A chemically etched metallic tip was coupled to the rectangular waveguide. By properly tuning tunable resonator and we could improve sensitivity spatial resolution of NSMM. measuring change quality factor in zone, images patterned metal films YBa2Cu3Oy thin were obtained better than 1 μm. observed...

An innovative atomic layer deposition (ALD) concept, with which nanostructures of water condensates high aspect ratio at equilibrium in cylindrical nanopores can be transformed uniformly into silica (SiO2) near room temperature and ambient pressure, has been demonstrated for the first time. As a challenging model system, we prove conversion porous alumina membranes to nanotubes (NTs) by introducing SiCl4 as metal reactant without involving any catalytic reaction. Surprisingly, NTs...

Journal Article PLASTIC SCINTILLATOR FOR RADIATION DOSIMETRY Get access Yewon Kim, Kim 1Department of Nuclear and Quantum Engineering, KAIST, Daejeon, Republic Korea Search for other works by this author on: Oxford Academic PubMed Google Scholar Hyunjun Yoo, Yoo Chankyu Kyung Taek Lim, Lim Myungkook Moon, Moon 2Korea Atomic Research Institute, Jongyul Gyuseong Cho * *Corresponding author: gscho1@kaist.ac.kr Radiation Protection Dosimetry, Volume 170, Issue 1-4, September 2016, Pages 187–190,...

Plastic scintillation detectors have practical advantages in the field of dosimetry. Energy calibration measured gamma spectra is important for dose computation, but it not simple plastic scintillators because their different characteristics and a finite resolution. In this study, polystyrene scintillator were calculated energy computation. Based on relationship between resolution estimated broadening effect spectra, simply without many iterations. The agreement with calculation by an...

Step-shaped bismuth (Bi) nanowires were fabricated by direct current electrochemical deposition technique using diameter-modulated anodic aluminum oxide membranes (AAO) as templates. The have core-sheath structure with a crystalline rhombohedral Bi core surrounded mixed (amorphous and monoclinic Bi2O3) layer. We observed transition of nanowire property from semimetal to semiconductor at wire diameter below 50 nm. Based on the just changing diameter, step-shaped could be predicted form...

The open ends of oxide nanotubes (NTs) can be sealed with silica at room temperature and pressure after incorporation desired materials into the NTs, payload volume which is adjustable (see picture for case fluorophores). This process originates from a synergetic reaction capillary-condensed water silicon reactants, rapidly produces NTs. Detailed facts importance to specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset....

In this paper, a newly-designed tamper detection multi-sensor with various functions is proposed. The consists of three different sensors, piezoresistive sensor and without mass, proximity sensor, photodiode which use MEMS technology. components the multi-sensor, could perceive types external tampers independently, resulting in more reliable responses. be applied to detect on system mobile units.

Plastic scintillators show several desired characteristics in dosimetry; especially tissue-equivalence is a definite advantage as an electrical personal dosimeter (EPD). The EPD based on array-type Silicon Photomultiplier (SiPM) coupled to the polystyrene scintillator was proposed at last time and has been improving. In this research, for application, of plastic were studied through MCNP5 LightTools simulation. For reliable MCNP simulation, Gaussian energy broadening (GEB) applied with...