Hokkaido University · Materials Science
Professor Seiichi Watanabe's research lab specializes in advanced materials synthesis and nanoscale characterization, focusing on the development of functional nanomaterials for energy and environmental applications. The lab investigates plasma- and laser-based synthesis techniques to create novel nanostructures such as black TiO₂ nanoparticles and self-organized nanodot arrays on semiconductors. A key research direction involves understanding the fundamental mechanisms of phase transformation and nanostructure evolution under extreme conditions, including pulsed laser irradiation and solution plasma processes. The lab combines in situ electron microscopy with advanced materials analysis to uncover dynamic processes at the atomic scale.
Figures are computed from collected data and may differ slightly.
Black TiO2 nanoparticles (b-TiO2) with superior solar–thermal water evaporation performance are prepared using a one-step solution plasma process (SPP) in ambient conditions. It is found that radicals that are generated during SPP play a critical role in b-TiO2 formation by comparing several water–alcohol electrolyte environments for the SPP synthesis. Our results show that the radical-induced formation of a black TiO2–x layer on the Ti electrode is necessary for b-TiO2 formation, which was igno
An in situ observation of the formation of a laser-irradiation-induced nanodot array on a Si surface was performed using a pulsed-laser-equipped high-voltage electron microscope (laser-HVEM). Under multiple nanosecond (ns) pulsed laser irradiation shots, atomic clusters were first formed and distributed on the surface in order to grow them epitaxially into protruded dots with diameters of ten nanometers or less. This is followed by their diffusion induced by successive laser shots to cannibalize
Electron microscopic studies have been made of austenite partially transformed from prior martensitic structure in the temperature range between Ac1and Ac3.It has been found that each acicular austenite grain which has been formed from ferrite laths with same orientation has same crystallographic orientation and the austenite has the KURDJUMOV-SACHS orientation relationship with the ferrite. The both lath boundary and cementite play an important role in the formation of acicular austenite grains
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