The University of Tokyo · 재료과학
Satoshi Watanabe 교수의 연구실은 나노스케일에서의 전자 구조와 표면 거동을 정밀하게 제어하는 데 초점을 맞추고 있습니다. 고강도 레이저를 활용한 두 색상 간 간섭을 통한 이온화 제어 및 고조파 생성 메커니즘 연구, 전도성 고무성 고분자(예: 폴리피롤 기반 웃은 전극)를 이용한 유연한 액추에이터 개발 등, 나노재료의 전기적·기계적 성질을 동시에 최적화하는 연구를 수행하고 있습니다. 특히, 고분자 기반 액추에이터의 공간 전하 분포와 전기적 응답 간의 상관관계를 규명함으로써, 새로운 유형의 전기적 변형 소자 설계 원리를 제시하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Two-color phase control in the total ion yield of ionization is successfully demonstrated in a tunneling regime by using a 100-fs Ti:sapphire laser and its third harmonic. Adding the third harmonic with an intensity of only 10% enhances the ion yield by a factor of 7. In photoelectron spectra, above threshold ionization peaks due to the third harmonic disappear when two colors are superimposed, resulting in a continuum spectrum. This shows two-color interference clearly. The intensities of high-
As an electrode for a bending-electrostrictive polyurethane actuator, we prepared a wrinkled polypyrrole electrode, expecting the following two effects because the wrinkled electrode could easily elongate by smoothing the wrinkles: (1) conductivity of the electrode would not decrease with the field-induced surface elongation of the actuator, and (2) the electrode would not constrain the actuation. The wrinkled electrode was prepared through in situ deposition of polypyrrole onto the polyurethane
The scanning-tunneling-microscopy (STM) images of the Si(111)\ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3- Ag surface have been calculated from first principles for a structural model of the surface recently proposed, or the modified honeycomb-chained-trimer model, which is consistent with reported photoemission and inverse-photoemission spectra. The results show excellent agreement with reported STM images. Each bright spot corresponding to a protrusion in the repo
Electronic structures of several atomic wires on an H-terminated Si(100)2\ifmmode\times\else\texttimes\fi{}1 surface have been examined by using first-principles calculations within the local-density-functional approach. Several dangling-bond (DB) wires, which are constructed by extracting H atoms from the surface, have been examined and found to have different characteristics depending on their structures. Electronic states near the Fermi energy are localized around the wire on the atomic scale
Application of an electric field bent a polyurethane single-layer film. The bending direction depended on the chemical structure of the polyurethane. A film made from a polyurethane (N-PU) that had phenylimino groups in its structure bent toward the anode side. On the other hand, another film made from a different kind of polyurethane (Nt-PU) that had nitrophenyl groups bent toward the cathode side. Measurements of the space-charge distributions in the films using a pulsed electroacoustic method
