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● すべて [20 records among 643] (20 hits)

■ CSOKE・2024 (Article) ETRAPD　 L. Csoka, W. Csoka, E. Tirronen, E. Nikolskaya, Y. Hiltunen and B. Ohtani, Exploring the molecular structure and treatment dynamics of cellulose fibres with photoacoustic and reversed double-beam spectroscopy, Polymers, 16, 3419 (2024).* [DOI] [LINK]

■ CSOKG・2024 (Preprint) ETRAPD　 L. Csoka, W. Csoka, E. Tirronen, E. Nikolskaya, Y. Hiltunen and B. Ohtani, Integrated analysis of cellulose structure and properties using solid-state low-field H-NMR and photoacoustic spectroscopy, Sci. Rep., 2024102039 (2024).*

■ CSOKF・2024 (Preprint) ETRAPD　 L. Csoka, W. Csoka, E. Tirronen, E. Nikolskaya, Y. Hiltunen and B. Ohtani, Exploring the molecular structure and treatment dynamics of cellulose fibres with photoacoustic and reversed double-beam spectroscopy, Preprints, 2024102039 (2024).* [DOI] [LINK]

■ SANOB・2024 (Full Paper) ETRAPD　 K. Sano, T. Ishida, T. Shimada, H. Tachibana, M. Takashima, B. Ohtani, S. Takagi and H. Inoue, Photocatalytic hydrogen evolution from transparent aqueous dispersion of quantum-sized SnO2 nanoparticles: Effect of electron trap density within one particle, J. Phys. Chem. C, published (2024). [DOI] A facile methodology of preparing a transparent aqueous dispersion of SnO2 (rutile) nanoparticles through sol/gel propagative hydrolysis/condensation of SnCl4 was reported. The transparent aqueous dispersion of SnO2 using wet nanoparticles (wet-NPs) as prepared exhibited an enormous enhancement of the photocatalytic H2 evolution reaction upon UV light irradiation, while NPs once dried from wet-NPs (dry-NPs) afforded only a turbid aqueous dispersion with completely silent reactivity against H2 evolution. Although wet- and dry-NPs of SnO2 have the same quantum-sized crystallites, the striking difference of the reactivity was ascribable to the different sizes of wet-NPs (6 nm) in a monomeric form and dry-NPs (58 nm) as agglomerated clusters in the aqueous dispersion. Detailed analysis of electron trap density by means of reversed double-beam photoacoustic spectroscopy (RDB-PAS) to reveal the energy-resolved distribution of electron traps and conduction-band bottom (ERDT/CBB) pattern indicated that the extremely small number of electron traps within one particle of wet-NPs enabled the enormous enhancement of H2 evolution, while a much larger number of electron traps within clusters of dry-NPs could efficiently capture the carrier electron to undergo dominant charge recombination, leading to being silent against H2 evolution.

■ LIBOR・2024 (Paper) ETRAPD　 M. Kajabova, T. Strysovsky, A. Bikbashev, Z. Kovarova, K. Simkovicova, R. Prucek, A. Panacek, P. Novak, J. Kopp, J. Kaslik, A. Malara, P. Frontera, S. Vajda, B. Ohtani, M. Takashima and L. Kvitek, Defect engineering in heterogeneous catalysis: CO2 hydrogenation on iron-based catalysts, J. CO2 Utilization, 85, 102863 (2024).* [DOI]

■ NATAS・2024 (Article) ETRAPD　 E. Serra-Perez, G. Drazic, M. Takashima, B. Ohtani, G. Zerjav, S. Kovacic and N. Novak Tusar, Influence of the surface structure of the TiO2 support on the properties of the Au/TiO2 photocatalyst for water treatment under visible light, Catal. Today, 437, 114264 (2024).* [DOI] Plasmonic composites combining titanium dioxide (TiO2) with highly dispersed noble metal nanoparticles have attracted great interest as they exhibit improved photocatalytic performance compared to the bare TiO2. In this article, TiO2-Au composite nanorods were synthesised by wet impregnation in combination with calcination. The obtained plasmonic composites were characterized by TEM, SEM, XRD, N2 sorption, UV-Vis diffuse reflectance spectroscopy (UV-Vis DR) and reversed double-beam photoacoustic spectroscopy (RDB-PAS) analysis. The RDB-PAS analysis revealed that the TiO2 nanorods (TNR) contain amorphous areas on the surface that influence the size of the grown gold nanoparticles. The amount of amorphous phase on the TiO2 surface of the analysed TNR samples increases from 16.4 %, 17 % and 20.2 % for TNR-A, TNR-B and TNR-C, respectively, and is closely related to the point of charge(pHPZC), which increases from the 3.9 ± 0.06, 4.7 ± 0.07 and 5.7 ± 0.04 for TNR-A, TNR-B and TNR-C, respectively. Au nanoparticle size distribution analysis obtained on the TNR surface shows that smaller Au nanoparticles are formed with pHPZC increase of the TNR support, i.e. 14.8 nm, 12.5 nm and 11.6 nm for TNR-A, TNR-B and TNR-C, respectively. This confirms that the differences in the surface charge of the TiO2 support influence the extent of hydrolysis of the Au precursor and its subsequent nucleation. Finally, the formation of OH・ radicals was monitored using fluorescence probe method with coumarin as the probe molecule. The results revealed that the TiO2/Au composites are capable of generating OH radicals under visible light illumination, with cat-C, containing the smallest Au particle sizes, being the most active among the materials tested.

■ MT4CT・2024 (Article) ETRAPN　 Q. Xi, V. Papaefthimiou, N. Le Breton, M. Lenertz, M. Takashima, V. Keller, B. Vileno and T. Cottineau*, Influence of Nitridation Conditions on the Doping Sites and Photocatalytic Visible Light Activity of Nb,N-Codoped TiO2, Chem. Mater., published (2024). [DOI] The photocatalytic performance of Nb,N-codoped TiO2 nanoparticles obtained via the sol-gel method was compared to that of N-doped TiO2. The study focused on investigating the effects of nitridation conditions on nitrogen insertion with a highlight on the nature of the doping sites in the photocatalyst depending on the initial presence of niobium in the TiO2. The photodegradation of methylene blue in solution under UV, visible, and simulated solar light was used to evaluate the photocatalytic activity of TiO2, Nb- or N-doped TiO2, and Nb,N-codoped TiO2 nanoparticles. Codoped TiO2 produced by mild thermal nitridation exhibits the best photocatalytic activity, with a strong contribution from visible light. On the contrary, the codoped TiO2 produced by more intense thermal nitridation presents lower photocatalytic performances than TiO2 despite a small improvement of activity in the visible range. In addition to material characterization (X-ray diffraction, UV-vis spectroscopy, and X-ray photoelectron spectroscopy), electron paramagnetic resonance and reversed double-beam photoacoustic spectroscopy measurements were used to identify the respective doping sites and ultimately propose the electronic band structure for each sample of Nb:TiO2, N:TiO2, and Nb,N:TiO2. Proper thermal nitridation conditions improve the charge compensation between Nb5＋ and N3-, thereby enhancing the photocatalytic activity. However, too intense nitridation conditions led to the generation of oxygen vacancies and a large amount of Ti3＋ acting as charge recombination centers, resulting in significant deterioration of the photocatalytic performances. This study highlights the importance of understanding the intricate charge compensation process in codoped (M,N) TiO2 materials, as the photocatalytic performance cannot be elucidated solely by the cation/anion ratio but also by considering the nature of the doping sites generated during synthesis.

■ SNGCL・2024 (Letter) NONBOS　 S. Furukawa, S. Matsuda and M. Takase, Importance of non crystalline-crystalline balance on the photocatalytic activity of bismuth-tungsten mixed-oxide particles prepared by a facile glycol method, Chem. Lett., 53, upae009 (2024).* [DOI] Here, we report results of the photocatalytic oxidative-decomposition activity of bismuth-tungsten mixed oxide particles prepared by a facile glycol method, i.e. heating the starting materials in ethylene glycol under atmospheric pressure with a block bath, which suggest the importance of the balanced formation of base crystalline bismuth tungstate and low-crystalline bismuth oxide deposits, as a possible site for two-electron transfer to oxygen on the bismuth tungstate to obtain relatively high photocatalytic activity.

■ KAGES・2023 (Full Paper) ETRAPD　 Y. Kageshima*, H. Inuzuka, H. Kumagai, B. Ohtani, K. Teshima and H. Nishikiori*, Photothermal Boosting of Photocatalytic Hydrogen Evolution Induced by Defects and Cocatalysts on TiO2, J. Phys. Chem. C., 127, 18327-18339 (2023).* [DOI]

■ XINTC・2023 (Article) ETRAPD　 F. Yu, C. Wang, R. Wang, Y. Li, B. Ohtani, A. Fujishima, Y. Liu and X. Zhang, Solution Plasma Engineers the Surface of N-TiO2 for Thermal Assisted Photocatalysis, Appl. Surf. Sci., 624, 157119 (2023).* [DOI]

■ SAIME・2023 (Research paper) ETRAPD　 S. Emin, M. Machreki, T. Chouki, G. Tyuliev, D. Zigon, B. Ohtani, A. Loukanov and P. Stefanov, Defective TiO2 Nanotube Arrays for Efficient Photoelectrochemical Degradation of Organic Pollutants, ACS Omega, 8, 21605-21617 (2023).* [DOI]

■ BIRIE・2023 (book section) BOOKPT　 B. Ohtani, Scientific Evaluation Methods in Photocatalysis Studies. In "Handbook of Self-Cleaning Surfaces and Materials: From Fundamentals to Applications", (Fujishima, Akira; Irie, Hiroshi; Zhang, Xintong; Tryk, Donald A. eds.) Wiley-VCH Verlag GmbH, 2023, pp. published. [LINK]

■ SNFEN・2023 (Article) ETRAPD　 M. Preeyanghaa, C. Chuaicham, B. Vellaichamy, S. Shenoy, W. Li, K. Manokaran, E. Varathan, B. Neppolian, B. Ohtani, K. Sasaki and K. Sekar, Unveiling the influence of Fe2O3 nanoparticles on CuxO-TiO2(B) nanofiber for dual Z-scheme electron transfer visible light photocatalysts: investigation on local atomic structures and electronic properties, Environ. Sci. Nano, 10, 1268-1283 (2023).* [DOI]

■ SNGCS・2023 (Article) ETRAPD　 K. Sasaki, T. Inoue, C. Chuaicham, N. Saito and B. Ohtani, Z-scheme heterojunction of graphitic carbon nitride and calcium ferrite in converter slag for the photocatalytic imidacloprid degradation and hydrogen evolution, J. Photochem. Photobiol. A Chem., 440, 114644 (2023).* [DOI]

■ SZYMO・2023 (Article) ETRAPD　 S. Dudziak, E. Kowalska, K. Wang, J. Karczewski, B. Ohtani and A. Zielinska-Jurek, The interplay between dopant and a surface structure of the photocatalyst - the case study of Nb-doped faceted TiO2, Appl. Catal. B. Environ., 328, 122448 (2023).* [DOI]

■ BCCAC・2023 (コラム) BOOKPT　 大谷文章，固体触媒材料の「同定」，触媒総合事典，516（2023）*

■ BCCAT・2023 (解説) BOOKPT　 大谷文章，《12-3》酸化チタン光触媒の歴史，触媒総合事典，484-485（2023）*

■ BHYDR・2023 (Chapter) BOOKPT　 B. Ohtani, M. A. Akanda, F. R. Amalia and M. Takashima, Fundamentals and Concepts of Photocatalytic Hydrogen Evolution, Photocatalytic Hydrogen Production for Sustainable Energy, published (2023). [LINK]

■ MAMAT・2023 (Short Communication) ETRAPD　 M. Musa, M. H. b. Mamat, N. Vasimalai, M. Malek, M. Ahmad, A. Suriani, A. Mohamed, H. Hassan, A. Subki, B. Ohtani and M. Rusop, Formation of a Novel Nanorod-Assembled TiO2 Actinomorphic-Flower-Like-Microsphere Film via Ta doping using a Facile Solution Immersion Method, Nanomaterials, 13, 256 (2023).* [DOI] A novel tantalum (Ta)-doped titanium dioxide with unique nanorod-assembled actinomorphic-flower-like-microsphere structured film (TTD) has been fabricated via the solution immersion method in a Schott bottle with improvised clamp. The samples were characterised using FESEM, HRTEM, XRD, Raman, and Hall effect measurements for their structural and electrical properties. Compared to the undoped sample, the rutile-phased TTD sample has higher electron concentration and mobility, and finer nanorods with an average diameter of 100nm that assembled to form microsphere-like structures. In addition, a reversed double-beam photoacoustic spectroscopy measurement has been performed for TTD which reveals that the sample has a high electron trap density up to 2.5μmolg -1 . The TTD showed promising results when employed as the sensing material for a resistive-type humidity sensor with the highest sensitivity of 310 obtained at 3 at.% Ta doping.

■ TKCNO・2022 (full paper) ETRAPD　 T. Khedr, S. M. El-Sheikh, M. Endo-Kimura, K. Wang, B. Ohtani and E. Kowalska, Development of sulfur-doped graphitic carbon nitride for hydrogen evolution under visible light irradiation, Nanomaterials, 13, 62 (2022).* [DOI]

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