The University of Tokyo · 공학
히로야수 야마하라 교수의 연구실은 나노구조 편재성 물질과 표면 응용을 기반으로 한 고감도 센서 기술을 핵심으로 연구를 진행하고 있습니다. 특히 그래핀 기반 표면 소리파 센서, 산화갈륨 나노와이어, 편광성 물질의 플렉소전기 효과를 활용한 실시간 기체 감지 기술이 주요 연구 분야입니다. 고감도, 저소비 전력, 실온에서의 작동이 가능한 환경 및 건강 모니터링용 센서 개발에 초점을 맞추고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract Flexoelectricity is a universal property associated with dielectric materials, wherein they exhibit remanent polarization induced by strain gradient. Rare-earth iron garnets, R 3 Fe 5 O 12 , are ferrimagnetic insulators with useful magnetic properties. However, they are unlikely to show remanent dielectric polarization because of their centrosymmetric structure. Here, to induce flexoelectricity, we investigate various rare-earth iron-garnet thin films deposited on lattice-mismatched sub
We report on the synthesis of gallium oxide nanowires by pulsed laser deposition using a gold catalyst. In the vapor-liquid-solid process, gold thickness was the crucial parameter for deciding the morphology of nanowires. In the case of 1 nm thick gold, homogeneous nanowire growth was confirmed at temperatures of 700°C to 850°C. Transmission electron microscopy and selected area electron diffraction measurements showed that the nanowires were polycrystalline. In the cathode luminescence spectra,
To improve the quality of modern life in the current society, low-power, highly sensitive, and reliable healthcare technology is necessary to monitor human health in real-time. In this study, we fabricated partially suspended monolayer graphene surface acoustic wave gas sensors (G-SAWs) with a love-mode wave to effectively detect ppt-level acetone gas molecules at room temperature. The sputtered SiO<sub>2</sub> thin film on the surface of a black 36°YX-LiTaO<sub>3</sub> (B-LT) substrate acted as
Carrier-type control of spin-glass (cluster spin-glass) is studied in order to engineer basic magnetic semiconductor elements using the memory functions of spin-glass. A key of carrier-polarity control in magnetite is the valence engineering between Fe(II) and Fe(III) that is achieved by Ti(IV) substitution. Single phases of (001)-oriented Fe3−xTixO4 thin films have been obtained on spinel MgAl2O4 substrates by pulsed laser deposition. Thermoelectric power measurements reveal that Ti-rich films
Detection of parts-per-trillion (ppt)-level acetone gas molecules at room temperature using suspended graphene on SiO<sub>2</sub> micropillars has rarely been achieved using solid-state devices or surface acoustic wave (SAW) sensors. This paper presents the effect of SiO<sub>2</sub> micropillars and suspended graphene as a guiding and sensing layer to detect acetone gas. The integration of suspended graphene with SiO<sub>2</sub> micropillars introduces a coupled resonance effect arising from the
