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Interactions of Single Particle with Organic Matters: A Facile Bottom-Up Approach to Low Dimensional Nanostructures. QUANTUM BEAM SCIENCE 2020. [DOI: 10.3390/qubs4010007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A particle induces a pack of chemical reactions in nanospace: chemical reactions confined into extremely small space provide an ultimate technique for the nanofabrication of organic matter with a variety of functions. Since the discovery of particle accelerators, an extremely high energy density can be deposited, even by a single isolated particle with MeV-ordered kinetic energy. However, this was considered to cause severe damages to organic molecules due to its relatively small bond energies, and lack of ability to control the reactions precisely to form the structures while retaining physico-chemical molecular functionalities. Practically, the severely damaged area along a particle trajectory: a core of a particle track has been simply visualized for the detection/dosimetry of an incident particle to the matters, or been removed to lead nanopores and functionalized by refilling/grafting of fresh organic/inorganic materials. The use of intra-track reactions in the so-called “penumbra” or “halo” area of functional organic materials has been realized and provided us with novel and facile protocols to provide low dimensional nano-materials with perfect size controllability in the 21st century. These protocols are now referred to as single particle nanofabrication technique (SPNT) and/or single particle triggered linear polymerization technique (STLiP), paving the way towards a new approach for nanomaterials with desired functionalities from original molecules. Herein, we report on the extremely wide applicability of SPNT/STLiP protocols for the future development of materials for opto-electronic, catalytic, and biological applications among others.
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Sakaguchi S, Sakurai T, Ma J, Sugimoto M, Yamaki T, Chiba A, Saito Y, Seki S. Conjugated Nanowire Sensors via High-Energy Single-Particle-Induced Linear Polymerization of 9,9'-Spirobi[9 H-fluorene] Derivatives. J Phys Chem B 2018; 122:8614-8623. [PMID: 30134093 DOI: 10.1021/acs.jpcb.8b06310] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nanostructures composed of conjugated polymers or π-conjugated molecules provide sensing platforms with large specific surface areas. One of the feasible approaches to accessing such nanostructured miniaturized sensors with ultrahigh sensitivity is to develop a network of organic nanowires with optical/electronic properties that can measure signals upon interacting with the analytes at their surfaces. In this work, organic nanowires with controlled number density and uniform length were fabricated by one-dimensional solid-state polymerization of 9,9'-spirobi[9 H-fluorene] (SBF) derivatives triggered by high-energy single particles. SBF was chosen as a conjugated molecular motif with the interplay of high density of π-electrons, high solubility, and uniform solid-state structures, allowing us to fabricate sensing platforms via solution processing. The as-deposited energy density in linear polymerization nanospace was theoretically analyzed by a collision model, interpreting nanowire sizes at subnanometer levels. The substitution of bromine atoms was confirmed to be effective not only for the higher collision probability of the incident particles but also for the remarkable increase in radiolytic neutral radical yield via C-Br cleavages or electron-dissociative attachments onto the bromine atoms. The fluorescence spectra of SBF-based nanowires were different from those of SBF derivatives due to extended bond formation as a result of polymerization reactions. Fluorescence was quenched by the addition of nitrobenzene, indicating the potential use of our nanowires for fluorometric sensing applications. Microwave-based conductivity measurements revealed that the SBF-based nanowires exhibited charge carrier transport property upon photoexcitation, and that the conductivity was changed upon treatment with nitrobenzene vapors. The presented strategy of bromination of aromatic rings for efficient fabrication of controlled nanowire networks with favorable fluorescent and charge transport properties of nanowires advances the development of nanostructured sensing systems.
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Affiliation(s)
- Shugo Sakaguchi
- Department of Molecular Engineering, Graduate School of Engineering , Kyoto University , Nishikyo-ku, Kyoto 615-8510 , Japan
| | - Tsuneaki Sakurai
- Department of Molecular Engineering, Graduate School of Engineering , Kyoto University , Nishikyo-ku, Kyoto 615-8510 , Japan
| | - Jun Ma
- Department of Molecular Engineering, Graduate School of Engineering , Kyoto University , Nishikyo-ku, Kyoto 615-8510 , Japan
| | - Masaki Sugimoto
- Takasaki Advanced Radiation Research Institute , National Institutes for Quantum and Radiological Science and Technology , Takasaki , Gunma 370-1292 , Japan
| | - Tetsuya Yamaki
- Takasaki Advanced Radiation Research Institute , National Institutes for Quantum and Radiological Science and Technology , Takasaki , Gunma 370-1292 , Japan
| | - Atsuya Chiba
- Takasaki Advanced Radiation Research Institute , National Institutes for Quantum and Radiological Science and Technology , Takasaki , Gunma 370-1292 , Japan
| | - Yuichi Saito
- Takasaki Advanced Radiation Research Institute , National Institutes for Quantum and Radiological Science and Technology , Takasaki , Gunma 370-1292 , Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering , Kyoto University , Nishikyo-ku, Kyoto 615-8510 , Japan
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Horio A, Sakurai T, Kayama K, Lakshmi G, Kumar Avasthi D, Sugimoto M, Yamaki T, Chiba A, Saito Y, Seki S. Remarkable effect of halogenation of aromatic compounds on efficiency of nanowire formation through polymerization/crosslinking by high-energy single particle irradiation. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2017.02.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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