Yuichi Utsumi

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Chemiluminescence (CL) detection integrated with a microchip capillary electrophoresis (MCE) system that was fabricated in poly(dimethylsiloxane) was demonstrated for chemical and biochemical analyses. Two model CL systems were involved here: metal ion-catalyzed luminol-peroxide reaction and dansyl species conjugated peroxalate-peroxide reaction. Different(More)
In this article, a microfluidic platform integrating capillary electrophoresis and bioluminescence (BL) detection that was fabricated in poly(dimethylsiloxane) (PDMS) with lab-on-a-chip technology was demonstrated for cellular metabolic analyses. A microchannels network, "cross combining with Y", was designed to perform on-chip sample preparation,(More)
Rapid and sensitive chemical sensing using microfluidic device equipped with sterically-bulky three-dimensional gold nanostructure (Au3D) was demonstrated. Au3D was expected as surface enhanced Raman scattering (SERS) active structure. Au3D was fabricated by convective selfassembly known as “coffee-ring” of the mixed solution of gold colloidal(More)
We developed an enzyme-linked immunosorbent assay for an endocrine disrupter, nonylphenol, using a microreactor composed of two reaction vessels stacked vertically through a microfluid filter. The filters constructed by deep X-ray lithography possessed 2100 through-bores (phi40 x 200 microm) in polymethylmethacrylate sheets (phi3 mm), which are appropriate(More)
Counterfeits are now world-wide issue. An anti-counterfeit technology with high security level (unclonable), high through-put rate of authentication, and low cost is desirable. Nanotag of plasmonic nanostructure with surface enhanced Raman scattering (SERS) activity is promised for the ideal authentication. The gold nanoparticle (AuNP) self-assemblies were(More)
We developed an automatic analytical system for the determination of an endocrine disrupting chemical, nonylphenol (NP), which employs a competitive Enzyme-Linked ImmunoSorbent Assay (ELISA) using a novel antigen-bound microfilter. The filter was set in a unique 3-dimensional microreactor, and all the fluidic processes for the reaction and detection were(More)
X-ray radiolysis of a Cu(CH3COO)2 solution was observed to produce caltrop-shaped particles of cupric oxide (CuO, Cu2O), which were characterized using high-resolution scanning electron microscopy and micro-Raman spectrometry. X-ray irradiation from a synchrotron source drove the room-temperature synthesis of submicrometer- and micrometer-scale cupric oxide(More)
The deposition of caltrop-shaped cupric oxide particles synthesized by X-ray radiolysis process was performed on a silicon substrate. The use of alcohol such as methanol and ethanol as an additive enabled the nucleation and growth of caltrop-shaped cupric particles, while no particles were produced in a cupric acetate solution without any alcohol with X-ray(More)
The microfabrication technique based on X-ray lithography has recently been applied to construct PTFE-based microstructures. This paper attempts to fabricate an integrated waveguide Butler matrix for short millimeter-wave using X-ray lithography. First, a cruciform 3-dB directional coupler and an intersection circuit are designed at 180 GHz. Then, a(More)