Tokyo Institute of Technology · Materials Science
Professor Nobuhiro Matsushita's research lab specializes in the development of advanced functional thin films and nanomaterials for electronic and energy applications. The lab focuses on low-temperature solution-based processes—such as spin-spray plating and wet-chemical deposition—for fabricating high-performance oxide films, including ferrites, ZnO, and SnO₂, with tailored magnetic, electrical, and sensing properties. Key research directions include electromagnetic noise suppression using high-permeability ferrite films, transparent and conductive oxide films for humidity sensing, and defect engineering in complex oxides for enhanced functionality. The lab emphasizes practical applications in microelectronics, flexible devices, and environmental sensors through innovative materials processing at low temperatures.
Figures are computed from collected data and may differ slightly.
Ni–Zn ferrite films were prepared by spin-spray ferrite plating method at 90 °C on glass substrates from a reaction solution of FeCl2(+FeCl3)+NiCl2+ZnCl2 and an oxidizing solution of NaNO2+CH3COONH4. The complex permeability μ=μ′−iμ″ values of the as-plated films were measured at frequencies up to 3 GHz. The Ni0.28Zn0.18Fe2.54O4 film 0.40 μm in thickness plated using the mixture of Fe2+ and Fe3+ as iron ions exhibited a high μ′ of around 42 and a resonance frequency fr of 1.2 GHz. This fr value
Ni–Zn–Co ferrite films were deposited by the spin-spray ferrite plating from an aqueous solution. Film with optimized Zn and Co contents (i.e., Ni0.22Zn0.52Co0.03Fe2.23O4) exhibited the real permeability μr′ higher than 260 at frequencies up to 130 MHz, and the imaginary permeability μr″ higher than 100 in the extremely wide frequency range from 100 MHz to 1 GHz. Prepared at the very low temperature of 90 °C without postdeposition annealing, these films are promising to be actually applied to el
Selection of the excitation wavelength at nonresonant and resonant Raman conditions provided detection selectivity in the tetragonal and cubic phases in CeO(2)-ZrO(2) nanocrystals, respectively. It was suggested that cubic-phase domains containing Ce(3+) deficiencies were involved in the tetragonal-phase matrix.
Thin films with cobalt ferrite layer on ZnO underlayer were prepared at substrate temperature T/sub s/ in the range of 80 approximately 600 degrees C by a facing targets sputtering apparatus. Crystallites in specimen films revealed almost perfect orientation of
High electric conductivity was achieved in ZnO films prepared by a low-temperature (<100 °C) wet-chemical process and subsequent UV treatment by a commercial blacklight-blue lamp with a central wavelength of 360 nm and output power of 2.0 mW cm−2. The UV treatment to the as-deposited film successfully decreased the electric resistivity of the film by three orders of magnitude from 11 to 4.4 × 10−3 Ω cm. The resistivity was not restored to the initial value even after dark storage for 50 days, in
An all-solution-processed transparent tin oxide (SnO<sub>2</sub>)-based humidity sensor was directly prepared on borosilicate glass (SnO<sub>2</sub>-G) and a flexible polyethylene terephthalate (SnO<sub>2</sub>-PET) substrate without using a template. The entire process included film deposition by a spin-spray process at 90 °C and subsequent hot water treatment (HWT) at 100 °C. The resistivity of the films dramatically decreased and had semiconductor characteristics after the HWT, even though th
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