The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Ichiro Yamashita - One of the best experts on this subject based on the ideXlab platform.

  • direct fabrication of uniform and high density sub 10 nm etching mask using ferritin molecules on si and gaas surface for actual quantum dot superlattice
    Applied Physics Express, 2011
    Co-Authors: Makoto Igarashi, Ichiro Yamashita, Rikako Tsukamoto, Chihsien Huang, Seiji Samukawa
    Abstract:

    Direct formation of a uniform, closely packed, and high-density two-Dimensional Array of ferritin molecules was successfully achieved on Si and GaAs substrates by modifying the surface using neutral beam oxidation, whereas the same protocol produced a low density and disorded Array on thermal silicon oxide. The surfaces of neutral-beam-oxidized SiO2 and GaAs and thermal silicon oxide were characterized, and the mechanism of ferritin Array formation was investigated. The experimental results strongly suggested that the surface hydrophilicity realized by the neutral beam oxidation is essential for the formation of an ordered and high-density two-Dimensional Array of ferritin molecules.

  • fabrication of a two Dimensional Array of nano particles using ferritin molecule
    Thin Solid Films, 2001
    Co-Authors: Ichiro Yamashita
    Abstract:

    Abstract A new process is proposed which exploits protein-supramolecules as scaffolds for producing inorganic, functional nano-structures on a flat surface, and its feasibility is studied. A two-Dimensional Array of iron-oxide loaded ferritin molecules formed by self-assembly at an air/water interface is transferred onto a hydrophobic Si surface and the protein shell of the ferritin molecule is eliminated by 1 h heat-treatment at 500°C under nitrogen. Scanning electron microscopy (SEM) shows a well-ordered Array of nanometer size dots on the Si surface. Atomic force microscopy (AFM) in contact mode indicates that the protein shell is eliminated by the heat-treatment, leaving only the iron cores. Fourier transform IR spectrophotometer (FTIR) analysis and weight measurements also indicate that the protein is selectively removed. From this result, together with the fact that ferritin molecules have the ability to accommodate various kinds of metals and metal complexes, it is feasible that nano-dot Arrays suitable for quantum electronic devices can be fabricated by this method, which, in this paper, is called a ‘Bio Nano Process’. This newly proposed method will provide more economic mass-production than any other method.

  • fabrication of a two Dimensional Array of nano particles using ferritin molecule
    Thin Solid Films, 2001
    Co-Authors: Ichiro Yamashita
    Abstract:

    Abstract A new process is proposed which exploits protein-supramolecules as scaffolds for producing inorganic, functional nano-structures on a flat surface, and its feasibility is studied. A two-Dimensional Array of iron-oxide loaded ferritin molecules formed by self-assembly at an air/water interface is transferred onto a hydrophobic Si surface and the protein shell of the ferritin molecule is eliminated by 1 h heat-treatment at 500°C under nitrogen. Scanning electron microscopy (SEM) shows a well-ordered Array of nanometer size dots on the Si surface. Atomic force microscopy (AFM) in contact mode indicates that the protein shell is eliminated by the heat-treatment, leaving only the iron cores. Fourier transform IR spectrophotometer (FTIR) analysis and weight measurements also indicate that the protein is selectively removed. From this result, together with the fact that ferritin molecules have the ability to accommodate various kinds of metals and metal complexes, it is feasible that nano-dot Arrays suitable for quantum electronic devices can be fabricated by this method, which, in this paper, is called a ‘Bio Nano Process’. This newly proposed method will provide more economic mass-production than any other method.

A.i. Toropov - One of the best experts on this subject based on the ideXlab platform.

K. Cunefare - One of the best experts on this subject based on the ideXlab platform.

  • Experimental characterization of a bi-Dimensional Array on negative capacitance piezo-patches for vibroacoustic control
    2016
    Co-Authors: Flaviano Tateo, Mohamed Najib Ichchou, Morvan Ouisse, Manuel Collet, K. Cunefare
    Abstract:

    A recent technological revolution in the fields of integrated MEMS has finally rendered possible the mechanical integration of active smart materials, electronics and power supply systems for the next generation of smart composite structures. Using a bi-Dimensional Array of electromechanical transducers, composed by piezo-patches connected to a synthetic negative capacitance, it is possible to modify the dynamics of the underlying structure. In this study, we present an application of the Floquet-Bloch theorem for vibroacoustic power flow optimization, by means of distributed shunted piezoelectric material. In the context of periodically distributed damped 2D mechanical systems, this numerical approach allows one to compute the multi-modal waves dispersion curves into the entire first Brillouin zone. This approach also permits optimization of the piezoelectric shunting electrical impedance, which controls energy diffusion into the proposed semi-active distributed set of cells. Furthermore, we present experimental evidence that proves the effectiveness of the proposed control method. The experiment requires a rectangular metallic plate equipped with seventy-five piezo-patches, controlled independently by electronic circuits. More specifically, the out-of-plane displacements and the averaged kinetic energy of the controlled plate are compared in two different cases (open-circuit and controlled circuit). The resulting data clearly show how this proposed technique is able to damp and selectively reflect the incident waves.

  • Experimental characterization of a bi-Dimensional Array of negative capitance piezo-patches for vibroacoustic control
    2013
    Co-Authors: Flaviano Tateo, Mohamed Najib Ichchou, Morvan Ouisse, Manuel Collet, K. Cunefare
    Abstract:

    A recent technological revolution in the fields of integrated MEMS has finally rendered possible the mechanical integration of active smart materials, electronics and power supply systems for the next generation of smart composite structures. Using a bi-Dimensional Array of electromechanical transducers, composed by piezo-patches connected to a synthetic negative capacitance, it is possible to modify the dynamics of the underlying structure. In this study, we present an application of the Floquet-Bloch theorem for vibroacoustic power on optimization, by means of distributed shunted piezoelectric material. In the context of periodically distributed damped 2D mechanical systems, this numerical approach allows one to compute the multi-modal waves dispersion curves into the entire first Brillouin zone. This approach also permits optimization of the piezoelectric shunting electrical impedance, which controls energy diffusion into the proposed semi-active distributed set of cells. Furthermore, we present experimental evidence that proves the effectiveness of the proposed control method. The experiment requires a rectangular metallic plate equipped with seventy-five piezo-patches, controlled independently by electronic circuits. More specifically, the out-of-plane displacements and the averaged kinetic energy of the controlled plate are compared in two different cases (open-circuit and controlled circuit). The resulting data clearly show how this proposed technique is able to damp and selectively reflect the incident waves.

G. M. Gusev - One of the best experts on this subject based on the ideXlab platform.

Chester Shu - One of the best experts on this subject based on the ideXlab platform.

  • Optical matrix for clock distribution and synchronous operation in two‐Dimensional Array devices
    Applied Physics Letters, 1996
    Co-Authors: K. S. Lee, Chester Shu
    Abstract:

    A scheme to generate an optical matrix from a mode‐locked Nd:YAG laser has been theoretically explored and experimentally demonstrated. The matrix consists of highly synchronized and sequentially delayed optical pulses suitable for use with two‐Dimensional Array optoelectronic devices and clock distribution system. The output pulses have the same state of polarization and no timing jitter is produced among the elements. Encoded outputs have been generated from the matrix using a set of photomasks. This technique can be applied to high‐speed optical parallel processing.