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576 results on '"Uji-I, Hiroshi"'

6. Visualizing Ribbon‐to‐Ribbon Heterogeneity of Chemically Unzipped Wide Graphene Nanoribbons by Silver Nanowire‐Based Tip‐Enhanced Raman Scattering Microscopy (Small 3/2024)

Author

Inose, Tomoko, primary, Toyouchi, Shuichi, additional, Hara, Shinnosuke, additional, Sugioka, Shoji, additional, Walke, Peter, additional, Oyabu, Rikuto, additional, Fortuni, Beatrice, additional, Peeters, Wannes, additional, Usami, Yuki, additional, Hirai, Kenji, additional, De Feyter, Steven, additional, Uji‐i, Hiroshi, additional, Fujita, Yasuhiko, additional, and Tanaka, Hirofumi, additional

Published
2024
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7. Nanoscale Chemical Diversity of Coke Deposits on Nano‐Printed Metal Catalysts Visualized by Tip‐Enhanced Raman Spectroscopy

Author

Filez, Matthias, primary, Walke, Peter, additional, Le‐The, Hai, additional, Toyouchi, Shuichi, additional, Peeters, Wannes, additional, Tomkins, Patrick, additional, Eijkel, Jan C. T., additional, De Feyter, Steven, additional, Detavernier, Christophe, additional, De Vos, Dirk E., additional, Uji‐I, Hiroshi, additional, and Roeffaers, Maarten B. J., additional

Published
2023
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10. Optical Cavity Design and Functionality for Molecular Strong Coupling.

Author

Hirai, Kenji, Andell Hutchison, James, and Uji‐i, Hiroshi

Subjects
OPTICAL resonators, THERMODYNAMICS
Abstract

Optical cavity/molecule strong coupling offers attractive opportunities to modulate photochemical or photophysical processes. When atoms or molecules are placed in an optical cavity, they can coherently exchange photonic energy with optical cavity vacuum fields, entering the strong coupling interaction regime. Recent work suggests that the thermodynamic and kinetic properties of molecules can be significantly changed by strong coupling, resulting in the emergence of intriguing photochemical and photophysical phenomena. As more and more physico‐chemical systems are studied under strong coupling conditions, optical cavities have also advanced in their sophistication, responsiveness, and (multi)functionality. In this review, we highlight some of these recent developments, particularly focusing on Fabry–Perot microcavities. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Visualizing Ribbon‐to‐Ribbon Heterogeneity of Chemically Unzipped Wide Graphene Nanoribbons by Silver Nanowire‐Based Tip‐Enhanced Raman Scattering Microscopy

Author

Inose, Tomoko, primary, Toyouchi, Shuichi, additional, Hara, Shinnosuke, additional, Sugioka, Shoji, additional, Walke, Peter, additional, Oyabu, Rikuto, additional, Fortuni, Beatrice, additional, Peeters, Wannes, additional, Usami, Yuki, additional, Hirai, Kenji, additional, De Feyter, Steven, additional, Uji‐i, Hiroshi, additional, Fujita, Yasuhiko, additional, and Tanaka, Hirofumi, additional

Published
2023
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13. Patient-derived organoids from endometrial disease capture clinical heterogeneity and are amenable to drug screening

Author

Boretto, Matteo, Maenhoudt, Nina, Luo, Xinlong, Hennes, Aurélie, Boeckx, Bram, Bui, Bich, Heremans, Ruben, Perneel, Lisa, Kobayashi, Hiroto, Van Zundert, Indra, Brems, Hilde, Cox, Benoit, Ferrante, Marc, Uji-i, Hiroshi, Koh, Kian Peng, D’Hooghe, Thomas, Vanhie, Arne, Vergote, Ignace, Meuleman, Christel, Tomassetti, Carla, Lambrechts, Diether, Vriens, Joris, Timmerman, Dirk, and Vankelecom, Hugo

Published
2019
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15. SERS Endoscopy for Monitoring Intracellular Drug Dynamics

Author

Fortuni, Beatrice, primary, Ricci, Monica, additional, Vitale, Raffaele, additional, Inose, Tomoko, additional, Zhang, Qiang, additional, Hutchison, James Andell, additional, Hirai, Kenji, additional, Fujita, Yasuhiko, additional, Toyouchi, Shuichi, additional, Krzyzowska, Sandra, additional, Van Zundert, Indra, additional, Rocha, Susana, additional, and Uji-i, Hiroshi, additional

Published
2023
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16. Selective Detection of Intracellular Drug Metabolism by Metal‐Organic Framework‐Coated Plasmonic Nanowire

Author

Zhang, Qiang, primary, Murasugi, Taku, additional, Watanabe, Kotomi, additional, Wen, Han, additional, Tian, Ya, additional, Ricci, Monica, additional, Rocha, Susana, additional, Inose, Tomoko, additional, Kasai, Hitoshi, additional, Taemaitree, Farsai, additional, Uji‐i, Hiroshi, additional, Hirai, Kenji, additional, and Fortuni, Beatrice, additional

Published
2023
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18. Curve Extraction by Geodesics Fusion: Application to Polymer Reptation Analysis

Author

Rahmoun, Somia, Mairesse, Fabrice, Uji-i, Hiroshi, Hofkens, Johan, Sliwa, Tadeusz, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Mansouri, Alamin, editor, Nouboud, Fathallah, editor, Chalifour, Alain, editor, Mammass, Driss, editor, Meunier, Jean, editor, and Elmoataz, Abderrahim, editor

Published
2016
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19. Host and guest joining forces : a holistic approach for metal-organic frameworks in nonlinear optics

Author

Wolf, Mathias, Hirai, Kenji, Toyouchi, Shuichi, Daelemans, Brent, Fron, Eduard, and Uji-i, Hiroshi

Abstract

Metal-organic frameworks (MOFs) are interesting candidates for applications in nonlinear optics (NLO). However, current design strategies for MOFs in NLO are typically limited to either engineering the MOF itself or using the MOF to align NLO-active molecules within its pores. But more design factors can be considered when engineering MOFs and choosing guest molecules. The NLO emission of the host and guests can be combined instead of using only either one of the two. The interaction between the host and guest can be a source for further improvement by changing the symmetry, dipole moment, bond lengths, charge distribution, etc. Additionally, unstable NLO molecules can potentially be stabilized by accommodation in the MOF. Here, we demonstrate a new strategy for MOFs by combining MOF-177 as a host and Li@C-60 as a guest for NLO, meaning that both the MOF itself as well as the guest molecules are emitting NLO signals, as well as further increasing the emission using their interaction elongating bonds within the MOF, thus fully using the MOF's potential for second harmonic generation. Using this approach, the overall emission can be boosted by 40% compared to MOF-177 alone. Furthermore, the accommodation into MOF-177 stabilizes Li@C-60 that is normally unstable under ambient conditions without a counterion.

Published
2022

20. Liquid-phase photo-induced covalent modification (PICM) of single-layer graphene by short-chain fatty acids

Author

Feng, Guilin, Inose, Tomoko, Suzuki, Nozomu, Wen, Han, Taemaitree, Farsai, Wolf, Mathias, Toyouchi, Shuichi, Fujita, Yasuhiko, 1000010754400, Hirai, Kenji, Uji-i, Hiroshi, Feng, Guilin, Inose, Tomoko, Suzuki, Nozomu, Wen, Han, Taemaitree, Farsai, Wolf, Mathias, Toyouchi, Shuichi, Fujita, Yasuhiko, 1000010754400, Hirai, Kenji, and Uji-i, Hiroshi

Abstract

We report an efficient photo-induced covalent modification (PICM) of graphene by short-chain fatty acids (SCFAs) with an alkyl chain at the liquid-solid interface for spatially resolved chemical functionalization of graphene. Light irradiation on monolayer graphene under an aqueous solution of the SCFAs with an alkyl chain efficiently introduces sp(3)-hybridized defects, where the reaction rates of PICM are significantly higher than those in pure water. Raman and IR spectroscopy revealed that a high density of methyl, methoxy, and acetate groups is covalently attached to the graphene surface while it was partially oxidized by other oxygen-containing functional groups, such as OH and COOH. A greater downshift of the G-band in Raman spectra was observed upon the PICM with longer alkyl chains, suggesting that the charge doping effect can be controlled by the alkyl chain length of the SCFAs. The systematic research and exploration of covalent modification in SCFAs provide new insight and a potentially facile method for bandgap engineering of graphene.

Published
2023

23. A light-mediated covalently patterned graphene substrate for graphene-enhanced Raman scattering (GERS).

Author

Feng, Guilin, Suzuki, Nozomu, Zhang, Qiang, Li, Jiangtao, Inose, Tomoko, Taemaitree, Farsai, K. M., Muhammed Shameem, Toyouchi, Shuichi, Fujita, Yasuhiko, Hirai, Kenji, and Uji-i, Hiroshi

Subjects
RAMAN scattering, GRAPHENE, ACETIC acid
Abstract

We report covalently patterned graphene with acetic acid as a new potential candidate for graphene-enhanced Raman scattering (GERS). Rhodamine 6G molecules in direct contact with the covalently modified region show an enormous enhancement (∼25 times) compared to the pristine region at 532 nm excitation. The GERS enhancement with respect to the layer thickness of the probed molecule, excitation wavelength, and covalently attached groups is discussed. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Watching Individual Enzymes at Work

Author

Blank, Kerstin, Rocha, Susana, De Cremer, Gert, Roeffaers, Maarten B. J., Uji-i, Hiroshi, Hofkens, Johan, Gräslund, Astrid, editor, Rigler, Rudolf, editor, and Widengren, Jerker, editor

Published
2010
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36. Li@C-60 thin films : characterization and nonlinear optical properties

Author

Wolf, Mathias, Toyouchi, Shuichi, Walke, Peter, Umemoto, Kazuki, Masuhara, Akito, Fukumura, Hiroshi, Takano, Yuta, Yamada, Michio, Hirai, Kenji, Fron, Eduard, Uji-i, Hiroshi, Wolf, Mathias, Toyouchi, Shuichi, Walke, Peter, Umemoto, Kazuki, Masuhara, Akito, Fukumura, Hiroshi, Takano, Yuta, Yamada, Michio, Hirai, Kenji, Fron, Eduard, and Uji-i, Hiroshi

Abstract

Organic materials have attracted considerable attention in nonlinear optical (NLO) applications as they have several advantages over inorganic materials, including high NLO response, and fast response time as well as low-cost and easy fabrication. Lithium-containing C-60 (Li@C-60) is promising for NLO over other organic materials because of its strong NLO response proven by theoretical and experimental studies. However, the low purity of Li@C-60 has been a bottleneck for applications in the fields of solar cells, electronics and optics. In 2010, highly purified Li@C-60 was finally obtained, encouraging further studies. In this study, we demonstrate a facile method to fabricate thin films of Li@C-60 and their strong NLO potential for high harmonic generation by showing its comparatively strong emission of degenerate-six-wave mixing, a fifth-order NLO effect.

Published
2022

37. Autotuning of Vibrational Strong Coupling for Site-Selective Reactions

Author

Hirai, Kenji, Ishikawa, Hiroto, Takahashi, Yasufumi, Hutchison, James A., Uji-i, Hiroshi, Hirai, Kenji, Ishikawa, Hiroto, Takahashi, Yasufumi, Hutchison, James A., and Uji-i, Hiroshi

Abstract

Site-selective chemistry opens new paths for the synthesis of technologically important molecules. When a reactant is placed inside a Fabry-Perot (FP) cavity, energy exchange between molecular vibrations and resonant cavity photons results in vibrational strong coupling (VSC). VSC has recently been implicated in modified chemical reactivity at specific reactive sites. However, as a reaction proceeds inside an FP cavity, the refractive index of the reaction solution changes, detuning the cavity mode away from the vibrational mode and weakening the VSC effect. Here we overcome this issue, developing actuatable FP cavities to allow automated tuning of cavity mode energy to maintain maximized VSC during a reaction. As an example, the site-selective reaction of the aldehyde over the ketone in 4-acetylbenzaldehyde is achieved by automated cavity tuning to maintain optimal VSC of the ketone carbonyl stretch during the reaction. A nearly 50 % improvement in site-selective reactivity is observed compared to an FP cavity with static mirrors, demonstrating the utility of actuatable FP cavities as microreactors for organic chemistry.

Published
2022

39. Multicolour photochromic fluorescence of a fluorophore encapsulated in a metal-organic framework

Author

Hirai, Kenji, Kitagawa, Taisei, Fujiwara, Hideki, Pirillo, Jenny, Hijikata, Yuh, Inose, Tomoko, and Uji-i, Hiroshi

Abstract

A fluorophore encapsulated in a metal-organic framework showed photochromic multicolour fluorescence. Irradiation with an ultraviolet laser induced the relocation of the fluorophore from a polar to a nonpolar environment, altering the emission from red to blue. This change in emission color can be repeatably recovered by heating the fluorophore-MOF composite.

Published
2020

42. Gold-coated silver nanowires for long lifetime AFM-TERS probes

Author

Wen, Han, primary, Inose, Tomoko, additional, Hirai, Kenji, additional, Akashi, Taiki, additional, Sugioka, Shoji, additional, Li, Jiangtao, additional, Peeters, Wannes, additional, Fron, Eduard, additional, Fortuni, Beatrice, additional, Nakata, Yoshihiko, additional, Rocha, Susana, additional, Toyouchi, Shuichi, additional, Fujita, Yasuhiko, additional, and Uji-i, Hiroshi, additional

Published
2022
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43. Li@C60 thin films: characterization and nonlinear optical properties

Author

Wolf, Mathias, primary, Toyouchi, Shuichi, additional, Walke, Peter, additional, Umemoto, Kazuki, additional, Masuhara, Akito, additional, Fukumura, Hiroshi, additional, Takano, Yuta, additional, Yamada, Michio, additional, Hirai, Kenji, additional, Fron, Eduard, additional, and Uji-i, Hiroshi, additional

Published
2022
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45. Failure‐Experiment‐Supported Optimization of Poorly Reproducible Synthetic Conditions for Novel Lanthanide Metal–Organic Frameworks with Two‐Dimensional Secondary Building Units

Author

Kitamura, Yu, primary, Terado, Emi, additional, Zhang, Zechen, additional, Yoshikawa, Hirofumi, additional, Inose, Tomoko, additional, Uji‐i, Hiroshi, additional, Tanimizu, Masaharu, additional, Inokuchi, Akihiro, additional, Kamakura, Yoshinobu, additional, and Tanaka, Daisuke, additional

Published
2021
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46. Front Cover: Failure‐Experiment‐Supported Optimization of Poorly Reproducible Synthetic Conditions for Novel Lanthanide Metal‐Organic Frameworks with Two‐Dimensional Secondary Building Units (Chem. Eur. J. 66/2021)

Author

Kitamura, Yu, primary, Terado, Emi, additional, Zhang, Zechen, additional, Yoshikawa, Hirofumi, additional, Inose, Tomoko, additional, Uji‐i, Hiroshi, additional, Tanimizu, Masaharu, additional, Inokuchi, Akihiro, additional, Kamakura, Yoshinobu, additional, and Tanaka, Daisuke, additional

Published
2021
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47. Gold-Photodeposited Silver Nanowire Endoscopy for Cytosolic and Nuclear pH Sensing

Author

Zhang, Qiang, primary, Inose, Tomoko, additional, Ricci, Monica, additional, Li, Jiangtao, additional, Tian, Ya, additional, Wen, Han, additional, Toyouchi, Shuichi, additional, Fron, Eduard, additional, Ngoc Dao, Anh Thi, additional, Kasai, Hitoshi, additional, Rocha, Susana, additional, Hirai, Kenji, additional, Fortuni, Beatrice, additional, and Uji-i, Hiroshi, additional

Published
2021
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49. Failure-experiment-supported optimization of poorly reproducible synthetic conditions for novel lanthanide metal-organic frameworks with two-dimensional secondary building units

Author

Tanaka, Daisuke, primary, Kitamura, Yu, additional, Terado, Emi, additional, Zhang, Zechen, additional, Yoshikawa, Hirofumi, additional, Inose, Tomoko, additional, Uji-i, Hiroshi, additional, Tanimizu, Masaharu, additional, Inokuchi, Akihiro, additional, and Kamakura, Yoshinobu, additional

Published
2021
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50. Selective crystallization via vibrational strong coupling

Author

Hirai, Kenji, Ishikawa, Hiroto, Chervy, Thibault, Hutchison, James A., Uji-I, Hiroshi, Hirai, Kenji, Ishikawa, Hiroto, Chervy, Thibault, Hutchison, James A., and Uji-I, Hiroshi

Abstract

The coupling of (photo)chemical processes to optical cavity vacuum fields is an emerging method for modulating molecular and material properties. Recent reports have shown that strong coupling of the vibrational modes of solvents to cavity vacuum fields can influence the chemical reaction kinetics of dissolved solutes. This suggests that vibrational strong coupling might also effect other important solution-based processes, such as crystallization from solution. Here we test this hitherto unexplored notion, investigating pseudopolymorphism in the crystallization from water of ZIF metal-organic frameworks inside optical microcavities. We find that ZIF-8 crystals are selectively obtained from solution inside optical microcavities, where the OH stretching vibration of water is strongly coupled to cavity vacuum fields, whereas mixtures of ZIF-8 and ZIF-L are obtained otherwise. Moreover, ZIF crystallization is accelerated by solvent vibrational strong coupling. This work suggests that cavity vacuum fields might become a tool for materials synthesis, biasing molecular self-assembly and driving macroscopic material outcomes.

Published
2021

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