Kyoto University · Engineering
Professor Takashi Sagawa's research lab specializes in the design, synthesis, and characterization of advanced functional materials for energy conversion and optoelectronic applications. The lab focuses on self-assembled nanostructures—particularly one-dimensional (1D) and microfibrous architectures—based on porphyrins, pyrenes, and conjugated polymers, with an emphasis on their photophysical properties and applications in organic and hybrid solar cells. Key research directions include the development of nanostructured semiconductors (e.g., ZnO nanorods, PbS quantum dots) and doped materials (e.g., Li-doped ZnO) to enhance charge transport and device efficiency. The lab also explores molecular-level transformations in platinum complexes and chromophore assemblies, combining advanced spectroscopy, electron microscopy, and crystallography to understand structure-property relationships.
Figures are computed from collected data and may differ slightly.
Microfibrous self-aggregation of chromophoric groups of porphyrin and/or pyrene substituted by didodecyl l-glutamic acid in organic media is confirmed by transmission electron microscopic (TEM) observation. Chromophoric probes of porphyrin and pyrene moieties enable evaluation of their assembling behavior photophysically through UV−vis, circular dichroism (CD), and fluorescence spectroscopic characterization. This spectroscopic characterization was able to compensate the lack of TEM observation
APC is a safe and effective modality for treatment of early gastric cancer with intramucosal invasion untreatable by surgical resection or EMR. However, further observations are necessary to determine the long term prognosis of patients undergoing this treatment.
Bulk heterojunction solar cells with highly ordered one-dimensional (1D) nanostructured components of semiconducting conjugated polymers, dyes, and metal oxides are reviewed in terms of device structure and performance. The morphologically controlled semiconducting materials show characteristic features of the light-harvesting and photocurrent generation. We highlight the recent progress and improvement of self-assembling 1D materials for a donor−acceptor active layer as well as an electron-tran
The nanorod arrays of ZnO incorporated with lithium atoms show specific crystallinity, photoluminescence and absorption properties, which are promising for the improvement of photovoltaic performance of hybrid solar cells based on ZnO/poly(3-hexylthiophene). Li ions can be incorporated into ZnO crystals during the hydrothermal growth of the nanorods. The presence of Li in ZnO crystal was confirmed through X-ray diffraction analysis and by the photoluminescence spectra obtained. The difference in
Four kinds of silyl(boryl)platinum(II) complexes, 2a−2d, have been prepared by oxidative addition of silylboranes to platinum(0) complexes, in situ generated from Pt(cod)2 and 2 molar quantity of tertiary phosphine ligands (L) in Et2O: cis-Pt(SiMe2Ph)(BX2)L2 (X2 = −OCMe2CMe2O− (pin), L = PMe3 (2a), PMe2Ph (2b), PEt3 (2c); X2 = −NMeCH2CH2NMe− (dmeda), L = PMe3 (2d)). Complexes 2a−2c undergo selective insertion of phenylacetylene into the Pt−B bond at room temperature in CD2Cl2, giving cis-Pt{C(Ph
Lead chalcogenides colloidal quantum dot (PbS CQD) solar cells employing an ordered bulk heterojunction (OBHJ) structure allow sufficient utilization of solar energy and at the same time ensure efficient charge extractions. However, the interfacial deficiency was determined to be a significant limiting factor for the further improvement of efficiency. Herein, a finely interpenetrating OBHJ structure between zinc oxide nanowire (ZnO NW) arrays and PbS CQDs was achieved by simultaneously controlli
Reversible and biphasic switching of monomer-to-R-chiral dimer transition and R-chiral-to-S-chiral dimer transition of cyanine chromophores were demonstrated by complex formation with hyaluronic acid.
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