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Mba H, Picher M, Daro N, Marchivie M, Guionneau P, Chastanet G, Banhart F. Lattice Defects in Sub-Micrometer Spin-Crossover Crystals Studied by Electron Diffraction. J Phys Chem Lett 2023; 14:8100-8106. [PMID: 37657083 DOI: 10.1021/acs.jpclett.3c01942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/03/2023]
Abstract
Spin-crossover particles of [Fe(Htrz)2trz](BF4) with sizes of some hundred nanometers are studied by in situ electron microscopy. Despite their high radiation sensitivity, it was possible to analyze the particles by imaging and diffraction so that a detailed analysis of crystallographic defects in individual particles became possible. The presence of one or several tilt boundaries, where the tilt axis is the direction of the polymer chains, is detected in each particle. An in situ exposure of the particles to temperature variations or short laser pulses to induce the spin crossover shows that the defect structure only changes after a high number of transformations between the low-spin and high-spin phases. The observations are explained by the anisotropy of the atomic architecture within the crystals, which facilitates defects between weakly linked crystallographic planes.
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Affiliation(s)
- Hilaire Mba
- Institut de Physique et Chimie des Matériaux, UMR 7504, Université de Strasbourg, CNRS, 67034 Strasbourg, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux, UMR 7504, Université de Strasbourg, CNRS, 67034 Strasbourg, France
| | - Nathalie Daro
- Université de Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, 33600 Pessac, France
| | - Mathieu Marchivie
- Université de Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, 33600 Pessac, France
| | - Philippe Guionneau
- Université de Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, 33600 Pessac, France
| | - Guillaume Chastanet
- Université de Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, 33600 Pessac, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux, UMR 7504, Université de Strasbourg, CNRS, 67034 Strasbourg, France
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Hu Y, Picher M, Palluel M, Daro N, Freysz E, Stoleriu L, Enachescu C, Chastanet G, Banhart F. Laser-Driven Transient Phase Oscillations in Individual Spin Crossover Particles. Small 2023; 19:e2303701. [PMID: 37246252 DOI: 10.1002/smll.202303701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Indexed: 05/30/2023]
Abstract
An unusual expansion dynamics of individual spin crossover nanoparticles is studied by ultrafast transmission electron microscopy. After exposure to nanosecond laser pulses, the particles exhibit considerable length oscillations during and after their expansion. The vibration period of 50-100 ns is of the same order of magnitude as the time that the particles need for a transition from the low-spin to the high-spin state. The observations are explained in Monte Carlo calculations using a model where elastic and thermal coupling between the molecules within a crystalline spin crossover particle govern the phase transition between the two spin states. The experimentally observed length oscillations are in agreement with the calculations, and it is shown that the system undergoes repeated transitions between the two spin states until relaxation in the high-spin state occurs due to energy dissipation. Spin crossover particles are therefore a unique system where a resonant transition between two phases occurs in a phase transformation of first order.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Marlène Palluel
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Nathalie Daro
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Eric Freysz
- Université de Bordeaux, CNRS UMR 5798, LOMA, Talence cedex, 33405, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Guillaume Chastanet
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
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Lamichhane S, McElveen KA, Erickson A, Fescenko I, Sun S, Timalsina R, Guo Y, Liou SH, Lai RY, Laraoui A. Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods. ACS Nano 2023; 17:8694-8704. [PMID: 37093121 DOI: 10.1021/acsnano.3c01819] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
[Fe(Htrz)2(trz)](BF4) (Fe-triazole) spin crossover molecules show thermal, electrical, and optical switching between high spin (HS) and low spin (LS) states, making them promising candidates for molecular spintronics. The LS and HS transitions originate from the electronic configurations of Fe(II) and are considered to be diamagnetic and paramagnetic, respectively. The Fe(II) LS state has six paired electrons in the ground states with no interaction with the magnetic field and a diamagnetic behavior is usually observed. While the bulk magnetic properties of Fe-triazole compounds are widely studied by standard magnetometry techniques, their magnetic properties at the individual level are missing. Here we use nitrogen vacancy (NV) based magnetometry to study the magnetic properties of the Fe-triazole LS state of nanoparticle clusters and individual nanorods of size varying from 20 to 1000 nm. Scanning electron microscopy (SEM) and Raman spectroscopy are performed to determine the size of the nanoparticles/nanorods and to confirm their respective spin states. The magnetic field patterns produced by the nanoparticles/nanorods are imaged by NV magnetic microscopy as a function of applied magnetic field (up to 350 mT) and correlated with SEM and Raman. We found that in most of the nanorods the LS state is slightly paramagnetic, possibly originating from the surface oxidation and/or the greater Fe(III) presence along the nanorods' edges. NV measurements on the Fe-triazole LS state nanoparticle clusters revealed both diamagnetic and paramagnetic behavior. Our results highlight the potential of NV quantum sensors to study the magnetic properties of spin crossover molecules and molecular magnets.
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Affiliation(s)
- Suvechhya Lamichhane
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Adam Erickson
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
| | - Ilja Fescenko
- Laser Center, University of Latvia, Jelgavas St 3, Riga LV-1004, Latvia
| | - Shuo Sun
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Rupak Timalsina
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
| | - Yinsheng Guo
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Sy-Hwang Liou
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Abdelghani Laraoui
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
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Gkolfi P, Tsivaka D, Tsougos I, Vassiou K, Malina O, Polaskova M, Polyzou CD, Chasapis CT, Tangoulis V. A facile approach to prepare silica hybrid, spin-crossover water-soluble nanoparticles as potential candidates for thermally responsive MRI agents. Dalton Trans 2021; 50:13227-13231. [PMID: 34546269 DOI: 10.1039/d1dt02479e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A reverse micelle method was used for the synthesis of water-soluble silica hybrid, spin-crossover (SCO) nanoparticles (NPs). MRI experiments provided temperature dependent T2 values, indicating their potential use as smart MRI agents, while lyophilization of NP dispersions in water yielded powders with a preserved but modified thermal hysteretic magnetic profile.
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Affiliation(s)
- Patroula Gkolfi
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Dimitra Tsivaka
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Ioannis Tsougos
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Katerina Vassiou
- Department of Radiology, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece
| | - Ondřej Malina
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic.
| | - Michaela Polaskova
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic. .,Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Christina D Polyzou
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Christos T Chasapis
- NMR Facility, Instrumental Analysis Laboratory, School of Natural Sciences, University of Patras, 26504, Patras, Greece
| | - Vassilis Tangoulis
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
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