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Functionality development through the surface architecture based
on assembling molecules, atoms and other nanoscopic objects |
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Materials emerge much more effective functions when proper shapes
and microstructures have been provided.Furthermore, by precisely locating
such functional material units, a novel function can be constructed through
the cooperative harmonic action between the functional units.
We have
continued the research on science and technology of "nanoscopic
surface architecture" in order to fabricate, assemble and integrate
materials into a regulated structure in minute scales down to the atomic/molecular
level.Our interests are mainly focused on thin films and surfaces consisting
of organic molecules and organic-inorganic interfaces. |
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Academic staff |
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Professor : Sugimura, Hiroyuki |
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Research Topics |
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Fabrication of thin films through self-assembling
processes and application of self-assembled materials to
surface finishing and micro-lithography. |
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Nanoscale surface modification using chemical reactions
locally induced based on scanning probe microscopy. |
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Contact / Office |
Room 119, School of Engineering Science Bldg, Yoshida Campus
TEL +81-75-753-9131 / FAX +81-75-753-4861
sugimura.hiroyuki.7mkyoto-u.ac.jp
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Associate Professor : Ichii, Takashi |
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Research Topics |
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Contact / Office |
Room 228, School of Engineering Science Bldg, Yoshida Campus
TEL +81-75-753-9130 / FAX +81-75-753-5484
ichii.takashi.2mkyoto-u.ac.jp |
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Assistant Professor : Utsunomiya, Toru |
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Research Topics |
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Contact / Office |
Room 218, School of Engineering Science Bldg, Yoshida Campus
TEL +81-75-753-5990
utsunomiya.toru.5vkyoto-u.ac.jp |
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Organic monolayer and organic-inorganic multilayers fabricated
by self-assembly |
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"Self-assemble" is a process by which molecules spontaneously
assembled and well-organized into a material.Self-assembling occurs during
some types of chemisorption due to interactions between adsorbing molecules
and a substrate (Fig.1).
We have been studying on fabrication of organic
monolayers and organic-inorganic multilayers in which each layer is controlled
to be a monomolecular thickness.Our research is focused on application
of such self-assembled thin films to surface finishing and micro-lithography.
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Attachment of organic molecules onto a semiconductor surface through
chemical processes |
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We have been investigating on the process for immobilizing organic
molecules onto silicon surfaces and chemical/physical properties of
such organic-semiconductor interfaces.
Organic molecules, for example, unsaturated
hydrocarbon, aromatic compounds alcohol and so forth, react with hydorgen-terminated
silicon surface and, consequently, attach covalently to the surface.As
shown in Fig.2, a contact resistance of a silicon substrate to a gold-coated
probe was found to be reduced when the substrate was coated with a conductive
organic monolayer.
We expect that this material becomes a new electronic
material, as well as its usefulness in a fundamental scientific research
on the electron transfer between silicon and organic molecule. |
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Manipulation of molecules and chemical reactions based on scanning
probe microscopy |
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Scanning probe microscopy (SPM) has an aspect as nanofabrication
tools.We have explored nanofabrication processes based on chemical reactions
locally induced with an SPM probe.We have succeeded in oxidizing and
reducing solid surfaces at a resolution close to 10 nm.By integrating
this scanning probe chemical conversion and other surface finishing technologies,
a verity of materials ranging from metals to polymers can be assembled
on a substrate surface in nm scale.
As schematically illustrated in Fig.3a, a material surface is modified with
a sharp SPM tip (Fig.3b).For example, an organic self-assembled monolayer was
electrochemically oxidized beneath the SPM tip and became to show a lower surface
potential in the modified area due to the formation of polar functional groups
such as carboxyl groups (Fig.3c).Figure 3d shows an example obtained by an integrated
process in which the SPM-based chemical conversion, wet etching and electroless
plating were combined.A gold line of 40 nm in width with a narrow gap smaller
than 10 nm was successfully fabricated.
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Processing of functional surface using hydrophobic ionic liquids |
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Ionic liquids (IL), or room-temperature molten salts, are substances, which are usually composed of organic anion and cation, and are liquid at ambient temperatures. Most of ILfs are non-volatile and non-flammable even at elevated temperatures, while usual organic solvents with neutral molecule(s) are sometimes volatile and flammable.
Taking advantage of the nature, ILfs are investigated as solvents for new electrochemical devices and for environmentally friendly organic syntheses, called ggreen chemistry.h We have been developing electrochemical surface modification, or functionalization, processes using a novel series of hydrophobic IL.
Studies are presently directed towards (a) thin-film processing of active metals that cannot be electrodeposited from aqueous media and (b) surface alloy-formation at elevated temperatures at which volatile solvents cannot be employed. |
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