Materials Literature
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Meeting Information: The 24th Workshop on JAXA Astrodynamics and Flight Mechanics 2014 (July 28-29, 2014. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
A compact ultrahigh-sensitivity image sensor consisting of a Spindt-type field emitter array (FEA) equipped with an active-matrix drive circuit and a high-gain avalanche rushing amorphous photoconductor (HARP) target was fabricated. The image sensor has a 640 × 480-pixel active-matrix Spindt-type FEA, which is equival…
The non-equilibrium site occupancy of zinc (Zn2+) and ferric (Fe3+) ions in dissimilar nanosized zinc ferrites (ZnFe2O4)powders obtained from the different milling time (0 to 24 h) of the as-combusted powders was investigated through Zn and Fe K-edge X-ray absorption near-edge structure (XANES) and extended X-ray abso…
Epitaxial stacked structure on Si substrates attracts much attention to sensors and actuator applications using functional material such as ferroelectrics, pyroelectrics and piezoelectrics since characteristics of those materials depend on crystallinity and crystal orientation. The epitaxial γ-Al2O3films on Si substra…
A fully transparent resistive random access memory (T-RRAM) device based on an ultrathin a-TiOxstorage layer sandwiched between the top ITO and bottom FTO electrodes (ITO/a-TiOx/FTO) was fabricated on the glass substrate. The memory device exhibited not only good optical transmittance (~80%) but also a bipolar resisti…
There is a strong interest on the graphene integration into planar technologies, but synthesis compatibility remains challenging. In contrast, for some electronic applications, as those related with liquid crystal displays, strictly single layer graphene is not required. Previously, we proposed an original method for…
A general theoretical description of the physical response of dispersive ensembles of semiconductor nano-sized objects of complex geometries, material compositions, and spatial distributions has been developed recently. We present a brief review on some recent results of our simulation of the absorption cross section…
A `pore engineering', which is an innovative method for controlling the memory performance of conducting-bridge random access memory (CB-RAM) by regarding the polycrystalline oxide memory layer as a nano-porous body, is proposed. This method is intended to control resistive switching properties by controlling the size…
A simple biofuel cell was constructed on a 50 μm-thick PI substrate using a porous carbon anode containing glucose oxidase and ferrocene, and a cathode containing bilirubin oxidase. Neither microchannel nor ion-exchange film separates the electrodes since the specificity of enzymes enable individual redox reactions in…
We present fabrication and optical properties of some sub-wavelength structures studied in our group, including the sub-100 nm size gold and silver split ring resonators (SRRs). The sub-100-nm SRRs can have magnetic resonance entering into the visible frequency spectrum. The silver SRRs as small as ~60 nm and fundamen…
This paper is demonstrated the effect of Ge interlayer and patterned substrate to form low resistance Ohmic contact of n-GaN. The Ge interlayer is acted as heavily n-type dopant atoms at the interface of metal and n-GaN to enhance carrier tunneling. The patterned substrate is designed to increase the annealing tempera…
A low temperature synthesis of graphene from poly(methyl methacrylate) by surface wave microwave plasma treatment was developed. Single- or double-layer graphene was formed. Raman signal mappings indicated that the obtained graphene consisted of small size of flakes and each flake connected to form continuous graphene…
Photovoltaic performance of a thin-film silicon solar cell based on light-trapping enhanced and surface-recombination reduced using an optimization of metal-assisted chemical etching (MACE) and TiO2passivation was demonstrated. The silver nanoparticles were used as etched mask in MACE process to obtain a nanoporous si…
Computational materials design®(CMD®) has been proven to be a very powerful tool for developing novel materials through obtaining relevant understanding of the basic principles underlying a system. Among others, realization of the switching mechanism in resistance random access memory (RRAM) devices has been an intere…
Dye-sensitized solar cells were fabricated on flexible substrate from TiO2nanoparticles by compression at room temperature and at elevated temperature. It was found that short circuit current increases and the thickness decreases with increasing the pressure during the compression. The conversion efficiency was improv…
A 50 nm-thick TiN sensing membrane with nitrogen (N2) ratio modification was firstly used in EGFET for pH sensing. The highest pH sensitivity of 61 mV/pH with linearity of 99.9% could be found in N2 to N2+Ar ratio of 20%. Similar performance could be maintained at least for 250 days. With additional PVC selective memb…
The process and device technologies of “topological-switching RAM” (TRAM) were investigated. The sputtering and dry etching of GeTe/Sb2Te3superlattice were developed as 300-mm-wafer processes. Fabrication and analyses of one-resistor and one-transistor one-resistor micro test structures revealed the electrical propert…
Graphene on SiC is studied using the first-principles calculation approach. Here, the roles of the [1-100] steps for the growth mechanism are focused on, and are discussed by comparing with the role of the [11-20] step. It has been found that the surface steps play important roles for the graphene growth. These studie…
An important parameter in composite materials is mechanical behavior and matrix-reinforcement interface interaction under applied stresses. In this investigation, bending strength of carbon-carbon composites synthesized from wood was analyzed as a measure of the composite mechanical properties. Also, densification eff…
In this study, pure powders such as molybdenum, silicon, aluminum and titanium carbide were utilized to produce MoSi2 compound, MoSi2 /20 Vol % TiC composite, MoSi2-x Al alloyed compound and MoSi2-x Al/20 Vol % TiC alloyed composite. The initial powders were mixed in specified ratios, and then, were activated by mecha…