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In this paper we review our recent results on optical properties of coaxial nanowires (NWs) based on dilute nitride alloys, such as GaAsN and GaNP. We show that these structures have a high structural and optical quality, and can potentially be used as polarized nano-scale light sources that emit linearly polarized light with the polarization direction perpendicular to the wire axis even in zinc blende...
Quantum dots optoelectronic devices such as laser diodes, light emitting diodes (LED), high-speed modulators, semiconductor optical amplifiers are much attention because of their low power consumption and temperature stability. We have developed a defect-less top-down dry process for 15-nm in-diameter and 8-nm in thickness GaAs quantum nanodisks (QNDs) LEDs by a bio-template, neutral beam etching...
Amyloid peptide beta (Aβ), as the main component of the amyloid plaques present in the patient brains of Alzheimer's disease (AD), is a group of peptides with typical number of amino acid residuals from 39 to 43. Aβ1−40 is the most dominant type in all Aβ variants and possesses the most closely correlation with late-onset AD. Synthetic Aβ1−40 from monomer to fibril in vitro shares many features with...
We demonstrated InGaN/GaN multiple quantum well (MQW) solar cells with vertical structure using aluminum (Al) reflectors in this study. The Al reflectors at the bottom of the solar cells can reflect large amount of photons back into the absorber layer, which greatly enhanced the photovoltaic properties of the MQW solar cells. These solar cell devices exhibit excellent performances, including an open-circuit...
We fabricated single electron transistors (SETs) by using gold nanoparticles as their islands. With a simple method of the fabrication, characteristics of capacitively-and resistively-coupled SETs (C-SETs and R-SETs) were achieved at 77 K and room temperature.
In this study, we present the characterization and the modeling of transparent silver nanowire thin-film heaters in terms of their transient thermal response when subjected to Joule heating and their electrical properties. The electrical properties, which showed a conductance-temperature dependence that is reduced down to a factor of 2 compared to the value for bulk silver, could be modeled accurately...
The use of biomimetic sensor has attracted attention due to its sensitivity and selectivity. Molecular imprinted polymer (MIP) among the best synthetic biomimetic interfaces to detect target molecules. However MIP has low electrical conductivity. Sensor fabricated using high conductive polymer will possess a good sensitivity and short response time. Therefore, it is important to enhance the conductivity...
Nanoscale morphology of the active layer in organic solar cells (OSCs) plays a significant role in affecting the overall performance of OSCs. In this work, by using the domain size to describe the morphology change with different annealing temperatures, the influence of annealing to nanoscale morphology in OSCs is intensively studied. Also, machine learning is utilized in investigating the relation...
Dense film electrodes of La0.6Sr0.4CoO3 were formed on ceria based solid electrolytes by pulsed laser deposition. The oxygen exchange reaction rate on the surface was evaluated by impedance spectroscopy, and the effect of coexistence of LaSrCoO4 phase on the surface was investigated. The tendency of Sr segregation on the surface of La0.6Sr0.4CoO3 was mitigated by addition of porous LaSrCoO4 layer,...
In order to understand the behavior of the crystal lattice deformation induced by the interstitial oxygen formation in La2(Ni0.9M0.1)O4+δ (M = Fe, Co, Cu), thermogravimetry, coulometric titration, and high temperature X-ray diffraction measurements were carried out in the temperature range between 873 to 1173 K and the P(O2) range between 10−24 to 1 bar. Oxygen content variation under wide range of...
Infrared sensing devices rely on narrow band gap semiconductors grown by expensive and complicated methods such as molecular beam epitaxy and chemical vapor deposition. Colloidal quantum dots (CQDs) offer a low-cost alternative to detect infrared light. In this study, we have successfully demonstrated synthesis of HgTe quantum dots, which can absorb midwave infrared (MWIR) at room temperature. The...
Here we report evidence of enhanced magnetic properties of carbon nanotubes (CNTs) and multilayer graphene (MLG) decorated with Co3O4 nanoparticles (NPs). These 1∶1 CNTs/Co3O4 and MLG/Co3O4 nano-composites were prepared by a one-step ultrasonic treatment in sodium dodecylbenzene sulfonate (SDBS) surfactant. Structure and morphology of the composites were verified using X-ray diffraction, scanning...
We study transient photoluminescence (PL) in In0.2Ga0.8N nano-disks (NDs) fabricated from a 2 or 3 nm-thick quantum well (QW) by damage-free neutral-beam etching utilizing bio-nano-engineered etching templates. A lateral averaged diameter of the ND was controlled to be 9 nm with a high sheet-density up to 2.6×1011 cm−2. Transient PL in the NDs was measured as a function of temperature and compared...
We have studied effects of deposition temperature on electrical properties of (ZnO)x(InN)1−x (ZION) films on ZnO templates. With increasing the deposition temperature from RT to 450°C, the electron mobility decreases from 93 cm2/Vs to 70 cm2/Vs and the carrier density increases from 1.8×1019 cm−3 to 3.4×1019 cm−3. Furthermore, we found a correlation between electrical properties and root mean square...
In this study, we have proposed an ingestible sensor platform utilizing gastric acid battery for daily healthcare. This platform has a fundamental application to precisely measure core body temperature as one of the most useful vital signs for health check. It also has the expandability to add various biosensors such as pH, pressure sensors etc‥ The architecture without a conventional battery is essential...
This letter investigates the effect of negative bias stress induced abnormal degradation in amorphous InGaZnO thin-film transistors (TFTs) at high temperature. Drain current-gate voltage (ID-VG) and capacitance-voltage (C-V) measurements are employed to analyze degradation mechanism. High temperature negative bias stress lead to not only a negative parallel shift in ID-VG but also a C-V distortion...
Vanadium dioxide (VO2) is a key material for modern thermochromic energy-efficient window coatings. Nanocomposite VO2-SiO2 films were fabricated by reactive magnetron sputtering. VO2 nanoparticles with grain sizes of about 100 nm were distributed uniformly in the SiO2 host, and the composite film showed excellent thermochromic properties with plasmonic effect.
This paper presents a concept of a micro thermal sensor to be used for defect inspection of a smoothly-finished surface such as a bare wafer or a hard disk. In the proposed concept, existences of the defects on a measurement surface will be detected by scanning the surface with the micro thermal sensor, which is utilized to detect the variation of the thermal flow in-between the sensor surface and...
This paper presents an assembled comb-drive XYZ-microstage with large displacements for the scanning of magnetic resonance force microscopy (MRFM) at cryogenic environment. The scanning XYZ-microstage with little affection to the thermal variation and magnetic fields is required. The comb-drive XYZ-microstage is assembled with an XY-microstage, two Z-actuators and a silicon base substrate using a...
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