61Ni synchrotron-radiation-based Mössbauer absorption spectroscopy of Ni nanoparticle composites
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We obtained energy-domain 61Ni synchrotron-radiation-based Mössbauer absorption spectra of three materials that relate to nanoparticles: Ni2(C8O6H2) metal-organic frameworks (MOFs), Ni nanoparticles synthesized by complete heat decomposition of the MOFs, and the composites of Ni nanoparticles and the MOFs synthesized by partial decomposition of the MOFs. The 61Ni abundance of all the samples was not enriched but we were successfully able to obtain their spectra in 1 day or less, by using a highly efficient measurement system where the internal conversion electrons from energy standard 61Ni86V14 foil were detected. Although both nanoparticle constituent and MOF constituent in the composites included Ni atoms, the Mössbauer parameters of the Ni nanoparticle constituent could be evaluated; the magnetic hyperfine field of the Ni nanoparticle constituent in the composites was different from that of the Ni nanoparticles obtained by the complete heat decomposition. This difference implied that the 3d and/or 4s electron configuration of the nanoparticle constituent were affected by the MOF constituent in the composites.
KeywordsSynchrotron-radiation-based Mössbauer absorption spectroscopy 61Ni Nuclear resonant scattering Nanoparticles Composites of nanoparticles Metal-organic frameworks
The authors would like to thank the Accelerator Group of SPring-8 for their support, especially with the operation of several electron bunch-modes and the top-up injection operation. These experiments were performed at the BL09XU and BL11XU beamlines of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2017A1862 for BL09XU, and 2015B3512, 2016A3508, 2017A3581 for BL11XU). A part of this work was performed under the Shared Use Program of Japan Atomic Energy Agency (JAEA) facilities (Proposal No. 2015B-E02) supported by JAEA advanced Characterization Nanotechnology Platform as a program of “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT). Another part of this work was performed under the Shared Use Program of National Institutes for Quantum and Radiological Science and Technology (QST) facilities (Proposal Nos. 2016A-E08 and 2017A-H01) supported by QST advanced Characterization Nanotechnology Platform as a program of “Nanotechnology Platform” of MEXT. A part of this work was supported by JSPS KAKENHI Grant-in-Aid for Scientific Research (S), Grant No. 24221005. We also thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
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