研究者データベース

石 旭(セキ キヨク)
創成研究機構
准教授

基本情報

所属

  • 創成研究機構

職名

  • 准教授

学位

  • 博士(北海道大学)

J-Global ID

研究キーワード

  • 酸化チタン   光電変換   人口光合成   光電気化学   プラズモニクス   

研究分野

  • ナノテク・材料 / 薄膜、表面界面物性
  • ナノテク・材料 / ナノ構造物理

職歴

  • 2016年04月 - 2020年03月 北海道大学 助教
  • 2014年04月 - 2016年03月 北海道大学 博士研究員

学歴

  • 2010年10月 - 2014年03月   Hokkaido University   Graduate School of Information Science and Technology   Ph.D.
  • 2007年09月 - 2010年03月   Xi'an Jiaotong University   School of the Electronic and Information Engineering   Master
  • 2003年09月 - 2007年07月   Xi'an Jiaotong University   School of Science   Bechelor

研究活動情報

論文

  • Yuan Luo, Ming Lun Tseng, Sunil Vyas, Hsin Yu Kuo, Cheng Hung Chu, Mu Ku Chen, Hsiang‐Chieh Lee, Wen‐Pin Chen, Vin‐Cent Su, Xu Shi, Hiroaki Misawa, Din Ping Tsai, Pan‐Chyr Yang
    Small Methods 2022年02月24日
  • Qiuchen Yan, En Cao, Quan Sun, Yutian Ao, Xiaoyong Hu, Xu Shi, Qihuang Gong, Hiroaki Misawa
    Nano Letters 21 21 9270 - 9278 2021年11月10日
  • Xiaoqian Zang, Xu Shi, Tomoya Oshikiri, Kosei Ueno, Yuji Sunaba, Keiji Sasaki, Hiroaki Misawa
    The Journal of Physical Chemistry C 125 36 19880 - 19886 2021年09月16日
  • Yoshiki Suganami, Tomoya Oshikiri, Xu Shi, Hiroaki Misawa
    Angewandte Chemie International Edition 2021年07月21日
  • Yuan Luo, Cheng Hung Chu, Sunil Vyas, Hsin Yu Kuo, Yu Hsin Chia, Mu Ku Chen, Xu Shi, Takuo Tanaka, Hiroaki Misawa, Yi-You Huang, Din Ping Tsai
    Nano Letters 21 12 5133 - 5142 2021年06月23日
  • Daniel E. Gomez, Xu Shi, Tomoya Oshikiri, Ann Roberts, Hiroaki Misawa
    NANO LETTERS 21 9 3864 - 3870 2021年05月 
    We experimentally demonstrate and theoretically study the formation of coherent plasmon-exciton states which exhibit absorption of >90% of the incident light (at resonance) and cancellation of absorption. These coherent states result from the interaction between a material supporting an electronic excitation and a plasmonic structure capable of (near) perfect absorption of light. We illustrate the potential implications of these coherent states by measuring the charge separation attainable after photoexcitation. Our study opens the prospect for realizing devices that exploit coherent effects in applications.
  • Yanfeng Cao, Xu Shi, Tomoya Oshikiri, Shuai Zu, Yuji Sunaba, Keiji Sasaki, Hiroaki Misawa
    Chemical Communications 57 4 524 - 527 2021年 

    The near field was tailored to be enhanced at the three-phase boundary of Au-NPs/TiO2/H2O for efficient water oxidation.

  • Yaguang Wang, Xu Shi, Tomoya Oshikiri, Shuai Zu, Kosei Ueno, Hiroaki Misawa
    Nanoscale 12 44 22674 - 22679 2020年11月04日 

    The plasmonic Ga2O3 photoanode with the interfacial TiO2 modification provide both a high reduction ability and an oxidation ability.

  • Xu Shi, Xiaowei Li, Takahiro Toda, Tomoya Oshikiri, Kosei Ueno, Kentaro Suzuki, Kei Murakoshi, Hiroaki Misawa
    ACS Applied Energy Materials 3 6 5675 - 5683 2020年06月22日 [査読有り][通常論文]
  • Tomoya Oshikiri, Xu Shi, Hiroaki Misawa
    European Journal of Inorganic Chemistry 2020 15-16 1345 - 1345 2020年04月30日
  • Tomoya Oshikiri, Xu Shi, Hiroaki Misawa
    European Journal of Inorganic Chemistry 2020 15-16 1396 - 1401 2020年04月30日 [査読有り][通常論文]
  • Yaolong Li, Quan Sun, Shuai Zu, Xu Shi, Yunquan Liu, Xiaoyong Hu, Kosei Ueno, Qihuang Gong, Hiroaki Misawa
    Physical Review Letters 124 16 163901 - 163901 2020年04月24日 [査読有り][通常論文]
     
    Near-field enhancement and dephasing time play critical roles in several applications of localized surface plasmon resonance. Here, using an example gold dimer system, we reveal the correlation between the near-field enhancement and dephasing time via time-resolved photoemission electron microscopy. Compared with isolated particles, dimers with small gap sizes show stronger near-field enhancement and shorter dephasing times. These results are well reproduced by numerical simulations and further explained by a coupled dipole approximation model. The roles of near- and far-field coupling and plasmon localization in balancing near-field enhancement and dephasing time are also unveiled.
  • Yanfeng Cao, Tomoya Oshikiri, Xu Shi, Kosei Ueno, Jie Li, Hiroaki Misawa
    ChemNanoMat 5 8 972 - 972 Wiley 2019年08月29日 [査読有り][通常論文]
  • Yanfeng Cao, Tomoya Oshikiri, Xu Shi, Kosei Ueno, Jie Li, Hiroaki Misawa
    ChemNanoMat 5 8 1008 - 1014 2019年08月23日
  • Injection compression molding of transmission-type Fano resonance biochips for multiplex sensing applications
    K.-L. Lee, M.-L. You, X. Shi, Y.-R. Li, K. Ueno, H. Misawa
    Appl. Mater. Today 16 72 - 82 2019年05月 [査読有り][通常論文]
  • Jinghuan Yang, Quan Sun, Kosei Ueno, Xu Shi, Tomoya Oshikiri, Hiroaki Misawa, Qihuang Gong
    Nature Communications 9 1 2018年12月 [査読有り][通常論文]
  • Xu Shi, Kosei Ueno, Tomoya Oshikiri, Quan Sun, Keiji Sasaki, Hiroaki Misawa
    Nature Nanotechnology 13 10 953 - 958 Springer Nature 2018年10月 [査読有り][通常論文]
  • Kosei Ueno, Tomoya Oshikiri, Quan Sun, Xu Shi, Hiroaki Misawa
    Chemical Reviews 118 6 2955 - 2993 2018年03月28日 [査読有り][通常論文]
     
    Metallic nanoparticles such as silver and gold show localized surface plasmon resonances (LSPRs), which are associated with near-field enhancement effects in the vicinity of nanoparticles. Therefore, strong light-matter interaction is induced by the near-field enhancement effects of LSPRs. Because the resonant wavelength of LSPRs can be easily controlled by the size and shape of the metallic nanoparticles in the visible and near-infrared wavelength range, LSPRs have received considerable attention as optical antennae for light energy conversion systems such as solar cells. LSPRs decay very quickly as a result of light scattering and excitation of electron-hole pairs in the metal itself. However, in addition to the near-field enhancement effect, this light scattering and electron-hole pair excitation, which are known to cause loss of LSPRs, can be utilized as a solar cell enhancement mechanism. Here, we focus on plasmonic solid-state solar cells. The mechanisms of the light scattering by LSPRs, near-field enhancement, and plasmon-induced charge separation based on electron-hole pair excitations can be clarified. We review the related studies from the viewpoint of these mechanisms rather than material science.
  • Chung V. Hoang, Koki Hayashi, Yasuo Ito, Naoki Gorai, Giles Allison, Xu Shi, Quan Sun, Zhenzhou Cheng, Kosei Ueno, Keisuke Goda, Hiroaki Misawa
    NATURE COMMUNICATIONS 8 1 2017年10月 [査読有り][通常論文]
     
    Plasmon-induced hot-electron generation has recently received considerable interest and has been studied to develop novel applications in optoelectronics, photovoltaics and green chemistry. Such hot electrons are typically generated from either localized plasmons in metal nanoparticles or propagating plasmons in patterned metal nanostructures. Here we simultaneously generate these heterogeneous plasmon-induced hot electrons and exploit their cooperative interplay in a single metal-semiconductor device to demonstrate, as an example, wavelength-controlled polarity-switchable photoconductivity. Specifically, the dual-plasmon device produces a net photocurrent whose polarity is determined by the balance in population and directionality between the hot electrons from localized and propagating plasmons. The current responsivity and polarity-switching wavelength of the device can be varied over the entire visible spectrum by tailoring the hot-electron interplay in various ways. This phenomenon may provide flexibility to manipulate the electrical output from light-matter interaction and offer opportunities for biosensors, long-distance communications, and photoconversion applications.
  • Jingchun Guo, Kosei Ueno, Jinghuan Yang, Xu Shi, Jie Li, Quan Sun, Tomoya Oshikiri, Hiroaki Misawa
    JOURNAL OF PHYSICAL CHEMISTRY C 121 39 21627 - 21633 2017年10月 [査読有り][通常論文]
     
    Near-field spectrum measurement techniques, including near-field scanning optical microscopy, electron energy loss spectroscopy, and multiphoton photoemission electron microscopy, are powerful means to investigate near-field interactions directly on closely spaced metallic nanoparticles or a metallic nanostructure coupled with optical modes, such as whispering gallery mode and waveguide mode, which are called coupled plasmonic systems. In the present study, we have successfully measured the near-field spectra of coupled plasmonic systems using a simple photoelectrochemical measurement based on plasmon-induced water oxidation. Coupling was explored between the localized surface plasmon resonance (LSPR.) mode and waveguide mode of periodic gold nanogratings patterned on a thin titanium dioxide waveguide film. It is known that the far-field reflection spectrum of this waveguide-LSPR coupling system shows a complicated shape with multiple peaks, and the coupling has been explored by numerical electromagnetic simulations so far. However, in this study, it was clearly elucidated that an internal quantum efficiency (IQE) spectrum observed in the plasmon-induced photocurrent generation has successfully reproduced the near-field spectrum predicted by electromagnetic simulations under the coupling conditions. The photocurrent generation based on the plasmon-induced charge separation is due to the near-field effect, and it can be considered that the IQE spectrum corresponds to the near-field spectrum. This study paves a new way to indirectly measure the near-field spectrum of plasmonic systems.
  • Ryohei Takakura, Tomoya Oshikiri, Kosei Ueno, Xu Shi, Toshiaki Kondo, Hideki Masuda, Hiroaki Misawa
    GREEN CHEMISTRY 19 10 2398 - 2405 2017年05月 [査読有り][通常論文]
     
    In this study, we developed a three-dimensional plasmonic photoanode using titanium dioxide nanotunnels (TNTs) loaded with gold nanoparticles (Au-NPs) for water splitting, to enhance the reaction efficiency. We also optimized the procedure of loading Au-NPs on complex three-dimensional structures. We discuss the correlation between the plasmon-induced charge separation obtained from photoelectrochemical measurement and the morphology of Au-NPs observed by transmission electron microscopy. We have successfully deposited well-dispersed Au-NPs on the walls of TNTs using HAu(OH)(4) as a precursor. The amount of Au-NPs on the TNTs was estimated to be approximately 15-fold larger than that on the thin film titanium dioxide substrate, and the particle size remained small. Photoelectrochemical water splitting was achieved by using a two-electrode system rather than a three-electrode system. Furthermore, stoichiometric water splitting was confirmed by estimating the amounts of the evolved H-2 and O-2 gases under visible light irradiation.
  • Kuang-Li Lee, Hsuan-Yeh Hsu, Meng-Lin You, Chia-Chun Chang, Ming-Yang Pan, Xu Shi, Kosei Ueno, Hiroaki Misawa, Pei-Kuen Wei
    SCIENTIFIC REPORTS 7 2017年03月 [査読有り][通常論文]
     
    Metallic nanostructure-based surface plasmon sensors are capable of real-time, label-free, and multiplexed detections for chemical and biomedical applications. Recently, the studies of aluminum-based biosensors have attracted a large attention because aluminum is a more cost-effective metal and relatively stable. However, the intrinsic properties of aluminum, having a large imaginary part of the dielectric function and a longer evanescent length, limit its sensing capability. Here we show that capped aluminum nanoslits fabricated on plastic films using hot embossing lithography can provide tailorable Fano resonances. Changing height of nanostructures and deposited metal film thickness modulated the transmission spectrum, which varied from Wood's anomaly-dominant resonance, asymmetric Fano profile to surface plasmon-dominant resonance. For biolayer detections, the maximum surface sensitivity occurred at the dip of asymmetric Fano profile. The optimal Fano factor was close to -1.3. The wavelength and intensity sensitivities for surface thickness were up to 2.58 nm/nm and 90%/nm, respectively. The limit of detection (LOD) of thickness reached 0.018 nm. We attributed the enhanced surface sensitivity for capped aluminum nanoslits to a reduced evanescent length and sharp slope of the asymmetric Fano profile. The protein-protein interaction experiments verified the high sensitivity of capped nanostructures. The LOD was down to 236 fg/mL.
  • Jingchun Guo, Tomoya Oshikiri, Kosei Ueno, Xu Shi, Hiroaki Misawa
    ANALYTICA CHIMICA ACTA 957 70 - 75 2017年03月 [査読有り][通常論文]
     
    We developed a localized surface plasmon-induced visible light-responsive photoelectrochemical (PEC) biosensor using a titanium dioxide (TiO2) photoelectrode loaded with gold nanoislands (AuNIs) for in situ real-time measurement of biotin-streptavidin association. As a proof of concept, self-assembled thiol-terminated biotin molecules bound on a AuNls/TiO2 photoelectrode were successfully utilized to explore the photocurrent response to streptavidin-modified gold nanoparticle (STA-AuNP) solutions. This plasmon-induced PEC biosensor is simple and easy to miniaturize. Additionally, the PEC biosensor achieves highly sensitive measurements under only visible light irradiation and prevents the UV-induced damage of samples. Furthermore, a novel approach has been proposed to realize the real-time monitoring of biotin-STA binding affinities and kinetics by analyzing the PEC sensing characteristics. This PEC biosensor and novel analysis method could provide a new approach for the specific electrical detection and real-time kinetic measurements for clinical diagnostics and drug development. (C) 2016 The Authors. Published by Elsevier B.V.
  • Kuang-Li Lee, Po-Cheng Tsai, Meng-Lin You, Ming-Yang Pan, Xu Shi, Kosei Ueno, Hiroaki Misawa, Pei-Kuen Wei
    ACS Omega 2 10 7461 - 7470 2017年 [査読有り][通常論文]
     
    The studies of nanostructure-based aluminum sensors have attracted huge attention because aluminum is a more cost-effective plasmonic material. However, the intrinsic properties of the aluminum metal, having a large imaginary part of the dielectric function and a longer electromagnetic field decay length and problems of poor long-term chemical stability, limit the surface-sensing capability and applicability of nanostructures. We propose the combination of capped aluminum nanoslits and a thin-capped dielectric layer to overcome these limitations. We show that the dielectric layer can positively enhance the wavelength sensitivities of the Wood's anomaly-dominant resonance and asymmetric Fano resonance in capped aluminum nanoslits. The maximum improvement can be reached by a factor of 3.5. Besides, there is an optimal layer thickness for the surface sensitivity because of the trade-off relationship between the refractive index sensitivity and decay length. We attribute the enhanced surface sensitivity to a reduced evanescent length, which is confirmed by the finite difference time-domain calculations. The protein-protein interaction experiments verify the high-surface sensitivity of the structures, and a limit of quantification (LOQ) of 1 pg/mL antibovine serum albumin is achieved. Such low-cost, highly sensitive aluminum-based nanostructures can benefit various sensing applications.
  • Ahmed Esmail Shalan, Sudhakar Narra, Tomoya Oshikiri, Kosei Ueno, Xu Shi, Hui-Ping Wu, Mahmoud~M. Elshanawany, Eric Wei-Guang Diau, Hiroaki Misawa
    Sustainable Energy & Fuels 1 7 1533  Royal Society of Chemistry ({RSC}) 2017年 [査読有り][通常論文]
  • Ahmed Esmail Shalan, Tomoya Oshikiri, Sudhakar Narra, Mahmoud M. Elshanawany, Kosei Ueno, Hui-Ping Wu, Keisuke Nakamura, Xu Shi, Eric Wei-Guang Diau, Hiroaki Misawa
    ACS APPLIED MATERIALS & INTERFACES 8 49 33592 - 33600 2016年12月 [査読有り][通常論文]
     
    CoOx is a promising hole-extracting layer (HEL) for inverted planar perovskite solar cells with device configuration ITO/CoOx/CH3NH3PbI3/PCBM/Ag. The devices fabricated according to a simple solution procedure showed the best photovoltaic performance attaining power conversion efficiency (PCE) of 14.5% under AM 1.5 G 1 sun irradiation, which is significantly superior to those of materials fabricated with a traditional HEL such as PEDOT:PSS (12.2%), NiOx (10.2%), and CuOx (9.4%) under the same experimental conditions. We characterized the chemical compositions with XPS, crystal structures with XRD, and film morphology with SEM/AFM techniques. Photoluminescence (PL) spectra and the corresponding PL decays for perovskite deposited on varied HEL films were recorded to obtain the hole-extracting characteristics, for which the hole extracting times show the order CoOx (2.8 ns) < PEDOT:PSS (17.5 ns) < NiOx (22.8 ns) < CuOx (208.5 ns), consistent with the trend of their photovoltaic performances. The reproducibility and enduring stability of those devices were examined to show the outstanding long-term stability of the devices made of metal oxide HEL, for which the CoOx device retained PCE approximate to 12% for over 1000 h.
  • Kosei Ueno, Tomoya Oshikiri, Xu Shi, Yuqing Zhong, Hiroaki Misawa
    INTERFACE FOCUS 5 3 2015年06月 [査読有り][通常論文]
     
    We have successfully developed a plasmon-induced artificial photosynthesis system that uses a gold nanoparticle-loaded oxide semiconductor electrode to produce useful chemical energy as hydrogen and ammonia. The most important feature of this system is that both sides of a strontium titanate single-crystal substrate are used without an electrochemical apparatus. Plasmon-induced water splitting occurred even with a minimum chemical bias of 0.23 V owing to the plasmonic effects based on the efficient oxidation of water and the use of platinum as a co-catalyst for reduction. Photocurrent measurements were performed to determine the electron transfer between the gold nanoparticles and the oxide semiconductor. The efficiency of water oxidation was determined through spectroelectrochemical experiments aimed at elucidating the electron density in the gold nanoparticles. A set-up similar to the water-splitting system was used to synthesize ammonia via nitrogen fixation using ruthenium instead of platinum as a co-catalyst.
  • Yuqing Zhong, Kosei Ueno, Yuko Mori, Xu Shi, Tomoya Oshikiri, Kei Murakoshi, Haruo Inoue, Hiroaki Misawa
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 53 39 10350 - 10354 2014年09月 [査読有り][通常論文]
     
    A plasmon-induced water splitting system that operates under irradiation by visible light was successfully developed; the system is based on the use of both sides of the same strontium titanate (SrTiO3) single-crystal substrate. The water splitting system contains two solution chambers to separate hydrogen (H-2) and oxygen (O-2). To promote water splitting, a chemical bias was applied by regulating the pH values of the chambers. The quantity of H-2 evolved from the surface of platinum, which was used as a reduction co-catalyst, was twice the quantity of O-2 evolved from an Au-nanostructured surface. Thus, the stoichiometric evolution of H-2 and O-2 was clearly demonstrated. The hydrogen-evolution action spectrum closely corresponds to the plasmon resonance spectrum, indicating that the plasmon-induced charge separation at the Au/SrTiO3 interface promotes water oxidation and the subsequent reduction of a proton on the backside of the SrTiO3 substrate. The chemical bias is significantly reduced by plasmonic effects, which indicates the possibility of constructing an artificial photosynthesis system with low energy consumption.
  • Xu Shi, Kosei Ueno, Tomoya Oshikiri, Hiroaki Misawa
    JOURNAL OF PHYSICAL CHEMISTRY C 117 47 24733 - 24739 2013年11月 [査読有り][通常論文]
     
    In this study, we demonstrated an improvement in the plasmon-enhanced photocurrent generation due to Fabry-Perot interference of titanium dioxide (TiO2) thin-film electrodes loaded with Au nanoislands (Au-NIs). TiO2 thin films with thicknesses of 215-274 nm, which show obvious Fabry-Perot interference, were deposited via atomic layer deposition (ALD) onto silica glass and were modified by the deposition of Au-NIs onto their surface. Anodic plasmon-enhanced photocurrent generation was observed over the Au-NIs-loaded TiO2 thin-film photoelectrodes. The incident photon to current efficiency (IPCE) action spectra correlated strongly with the Au-NIs plasmon resonance and exhibited a strong dependence on the thickness of the TiO2 thin film. The photocurrent conversion efficiency increased when the transmission constructive interference wavelength overlapped with the Au-NIs plasmon resonance band. This work provides a simple and applicable approach for the further design of low-cost and lightweight plasmon-enhanced energy conversion devices.
  • Xu Shi, Kosei Ueno, Naoki Takabayashi, Hiroaki Misawa
    Journal of Physical Chemistry C 117 6 2494 - 2499 2013年02月14日 [査読有り][通常論文]
     
    Metallic nanoparticles showing localized surface plasmon resonance (LSPR) are efficient elements in the localization of light to nanometer-scale regions and enhance the light-matter interaction. We show that gold nanoisland (Au-NI)-loaded titanium dioxide (TiO2) photoelectrodes exhibited plasmon-enhanced photocurrent generation in the visible wavelength region, and the photocurrent action spectrum was corresponding to the LSPR band. The photocurrent enhancement may result from the plasmon-assisted electron transfer reaction from Au-NI to TiO2. A hole with high oxidation ability was left at the TiO2 surface states near the Au-NIs/TiO2 interface, which has the potential for photocatalytic water oxidation. The photocurrent generation efficiency of Au-NIs/TiO2 photoelectrode is highly dependent on the annealing temperature for the preparation of Au-NIs. High-resolution transmission electron microscopy and electron energy-loss spectroscopy analyses show that the interfacial structure between Au-NI and TiO2 plays a crucial role in the photocurrent generation efficiency and photocatalytic ability. © 2012 American Chemical Society.
  • Yu Teng, Kosei Ueno, Xu Shi, Daisuke Aoyo, Jianrong Qiu, Hiroaki Misawa
    ANNALEN DER PHYSIK 524 11 733 - 740 2012年11月 [査読有り][通常論文]
     
    The authors report on surface plasmon-enhanced fluorescence of Eosin Y molecules induced by gold nanostructures. Al2O3 films deposited by atomic layer deposition with sub-nanometer resolution were used as the spacer layer to control the distance between molecules and the gold surface. As the thickness of the Al2O3 film increased, the fluorescence intensity first increased and then decreased. The highest enhancement factor is achieved with a 1 nm Al2O3 film. However, the trend for the fluorescence lifetime is the opposite. It first decreased and then increased. The changes in the fluorescence quantum yield were also calculated. The yield shows a similar trend to the fluorescence intensity. The competition between the surface plasmon-induced increase in the radiative decay rate and the gold-induced fluorescence quenching is responsible for the observed phenomenon. In addition, this competition strongly depends on the thickness of the spacer layer between Eosin Y molecules and the gold surface.
  • Kuang-Li Lee, Min-Jian Chih, Xu Shi, Kosei Ueno, Hiroaki Misawa, Pei-Kuen Wei
    ADVANCED MATERIALS 24 35 OP253 - OP259 2012年09月 [査読有り][通常論文]

その他活動・業績

共同研究・競争的資金等の研究課題

  • Study on Dynamics of Plasmon-Induced Charge Carriers under the Modal Strong Coupling Conditions
    Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
    研究期間 : 2020年04月 -2022年03月
  • 日本学術振興会:科学研究費助成事業 若手研究(B)
    研究期間 : 2015年04月 -2017年03月 
    代表者 : 石 旭
     
    本研究では表面増強ラマン散乱計測を利用し、金属ナノ微粒子の表面プラズモン増強水酸化反応を観察した。また、金ナノ粒子を担持した酸化チタン電極におけるプラズモン誘起電荷分離に対する界面効果を明らかにした。さらに、表面プラズモン増強水酸化反応とプラズモン誘起電荷分離に対する界面効果の結果に基づいて、広帯域の光捕集のために金属/半導体/金属によって構成される完全光吸収機能を有するプラズモン誘起光エネルギー変換システムの構築にも成功した。


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