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Feygenson M, Huang Z, Xiao Y, Teng X, Lohstroh W, Nandakumaran N, Neuefeind JC, Everett M, Podlesnyak AA, Salazar-Alvarez G, Ulusoy S, Valvo M, Su Y, Ehlert S, Qdemat A, Ganeva M, Zhang L, Aronson MC. Probing spin waves in Co 3O 4 nanoparticles for magnonics applications. NANOSCALE 2024; 16:1291-1303. [PMID: 38131194 DOI: 10.1039/d3nr04424f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
The magnetic properties of spinel nanoparticles can be controlled by synthesizing particles of a specific shape and size. The synthesized nanorods, nanodots and cubic nanoparticles have different crystal planes selectively exposed on the surface. The surface effects on the static magnetic properties are well documented, while their influence on spin waves dispersion is still being debated. Our ability to manipulate spin waves using surface and defect engineering in magnetic nanoparticles is the key to designing magnonic devices. We synthesized cubic and spherical nanoparticles of a classical antiferromagnetic material Co3O4 to study the shape and size effects on their static and dynamic magnetic proprieties. Using a combination of experimental methods, we probed the magnetic and crystal structures of our samples and directly measured spin wave dispersions using inelastic neutron scattering. We found a weak, but unquestionable, increase in exchange interactions for the cubic nanoparticles as compared to spherical nanoparticle and bulk powder reference samples. Interestingly, the exchange interactions in spherical nanoparticles have bulk-like properties, despite a ferromagnetic contribution from canted surface spins.
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Affiliation(s)
- Mikhail Feygenson
- European Spallation Source ERIC, SE-221 00 Lund, Sweden.
- Jülich Centre for Neutron Science (JCNS-1) at Forschungszentrum Jülich, D-52425 Jülich, Germany
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden
| | - Zhongyuan Huang
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, China
| | - Yinguo Xiao
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, China
| | - Xiaowei Teng
- Worcester Polytechnic Institute, Department of Chemical Engineering, Worcester 01609, USA
| | - Wiebke Lohstroh
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 8574 Garching, Germany
| | - Nileena Nandakumaran
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Jülich GmbH, 52425, Jülich, Germany
| | - Jörg C Neuefeind
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Michelle Everett
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Andrey A Podlesnyak
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Germán Salazar-Alvarez
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden
| | - Seda Ulusoy
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden
| | - Mario Valvo
- Department of Chemistry, Uppsala University, 75121 Uppsala, Sweden
| | - Yixi Su
- Jülich Centre for Neutron Science (JCNS-4) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Sascha Ehlert
- Jülich Centre for Neutron Science (JCNS-1) at Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Asma Qdemat
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Jülich GmbH, 52425, Jülich, Germany
| | - Marina Ganeva
- Jülich Centre for Neutron Science (JCNS-4) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Lihua Zhang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - Meigan C Aronson
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
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Giri N, Biswas BS, Sengupta P, Ray R. Exchange bias and magnetic memory effect in hole doped Nd 0.78Sr 0.22CoO 3 nanoparticles. RSC Adv 2022; 12:26470-26475. [PMID: 36275144 PMCID: PMC9478994 DOI: 10.1039/d2ra04454d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/03/2022] [Indexed: 11/21/2022] Open
Abstract
Nd0.78Sr0.22CoO3 nanoparticles having 89 nm average particle size are synthesized by standard sol–gel techniques.
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Affiliation(s)
- Neepamala Giri
- Department of Physics, Jadavpur University, Kolkata-700032, India
| | | | - Payal Sengupta
- Department of Physics, Jadavpur University, Kolkata-700032, India
| | - Ruma Ray
- Department of Physics, Jadavpur University, Kolkata-700032, India
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Wang C, Zhang J, Zhang Z, Ren G, Cai D. One-step conversion of tannic acid-modified ZIF-67 into oxygen defect hollow Co 3O 4/nitrogen-doped carbon for efficient electrocatalytic oxygen evolution. RSC Adv 2020; 10:38906-38911. [PMID: 35518438 PMCID: PMC9057370 DOI: 10.1039/d0ra07696a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 10/12/2020] [Indexed: 11/21/2022] Open
Abstract
Controllable structure and defect design are considered as efficient strategies to boost the electrochemical activity and stability of catalysts for the oxygen evolution reaction (OER). Herein, oxygen defect hollow Co3O4/nitrogen-doped carbon (OV-HCo3O4@NC) composites were successfully synthesized using tannic acid-modified ZIF-67 (TAMZIF-67) as the precursor through a one-step pyrolysis. Tannic acid provides abundant oxygen during the pyrolysis process of the modified ZIF-67, which can contribute to the formation of oxygen defects and the construction of a hollow structure. The existence of oxygen defects is shown by X-ray photoelectron spectroscopy and electron paramagnetic resonance, whereas the hollow structure is confirmed by transmission electron microscopy. The optimized OV-HCo3O4@NC shows good electrocatalytic activity and exhibits a low overpotential of 360 mV at a current density of 10 mA cm−2 in 0.1 M KOH due to the hollow structure, abundant oxygen defects, and good electrical conductivity. This work provides valuable insights into the exploration of promising OER electrocatalysts with oxygen defects and special structures. Oxygen defect hollow Co3O4/nitrogen-doped carbon (OV-HCo3O4@NC) nanocomposites were successfully synthesized by simple one-step pyrolysis of tannic acid-modified ZIF-67 (TAMZIF-67). OV-HCo3O4@NC shows good OER electrocatalytic activity and stability.![]()
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Affiliation(s)
- Changshui Wang
- Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 P. R. China
| | - Jiahui Zhang
- Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 P. R. China
| | - Zenong Zhang
- Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 P. R. China
| | - Guancheng Ren
- Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 P. R. China
| | - Dandan Cai
- Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 P. R. China
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Rauwel E, Al-Arag S, Salehi H, Amorim CO, Cuisinier F, Guha M, Rosario MS, Rauwel P. Assessing Cobalt Metal Nanoparticles Uptake by Cancer Cells Using Live Raman Spectroscopy. Int J Nanomedicine 2020; 15:7051-7062. [PMID: 33061367 PMCID: PMC7522600 DOI: 10.2147/ijn.s258060] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 07/08/2020] [Indexed: 11/26/2022] Open
Abstract
Purpose Nanotechnology applied to cancer treatment is a growing area of research in nanomedicine with magnetic nanoparticle-mediated anti-cancer drug delivery systems offering least possible side effects. To that end, both structural and chemical properties of commercial cobalt metal nanoparticles were studied using label-free confocal Raman spectroscopy. Materials and Methods Crystal structure and morphology of cobalt nanoparticles were studied by XRD and TEM. Magnetic properties were studied with SQUID and PPMS. Confocal Raman microscopy has high spatial resolution and compositional sensitivity. It, therefore, serves as a label-free tool to trace nanoparticles within cells and investigate the interaction between coating-free cobalt metal nanoparticles and cancer cells. The toxicity of cobalt nanoparticles against human cells was assessed by MTT assay. Results Superparamagnetic Co metal nanoparticle uptake by MCF7 and HCT116 cancer cells and DPSC mesenchymal stem cells was investigated by confocal Raman microscopy. The Raman nanoparticle signature also allowed accurate detection of the nanoparticle within the cell without labelling. A rapid uptake of the cobalt nanoparticles followed by rapid apoptosis was observed. Their low cytotoxicity, assessed by means of MTT assay against human embryonic kidney (HEK) cells, makes them promising candidates for the development of targeted therapies. Moreover, under a laser irradiation of 20mW with a wavelength of 532nm, it is possible to bring about local heating leading to combustion of the cobalt metal nanoparticles within cells, whereupon opening new routes for cancer phototherapy. Conclusion Label-free confocal Raman spectroscopy enables accurately localizing the Co metal nanoparticles in cellular environments. The interaction between the surfactant-free cobalt metal nanoparticles and cancer cells was investigated. The facile endocytosis in cancer cells shows that these nanoparticles have potential in engendering their apoptosis. This preliminary study demonstrates the feasibility and relevance of cobalt nanomaterials for applications in nanomedicine such as phototherapy, hyperthermia or stem cell delivery.
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Affiliation(s)
- Erwan Rauwel
- Institute of Technology, Estonian University of Life Sciences, Tartu, Estonia
| | | | | | - Carlos O Amorim
- Dpt. Of Physics & CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | | | - Mithu Guha
- Dpt. Of General & Molecular Pathology, Faculty of Medicine, University of Tartu, Tartu, Estonia
| | - Maria S Rosario
- CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | - Protima Rauwel
- Institute of Technology, Estonian University of Life Sciences, Tartu, Estonia
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Litzbarski LS, Klimczuk T, Winiarski MJ. Synthesis, structure and physical properties of new intermetallic spin glass-like compounds RE 2PdGe 3 (RE = Tb and Dy). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:225706. [PMID: 32032001 DOI: 10.1088/1361-648x/ab73a4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
New intermetallic compounds Tb2Pd1.25Ge2.75 and Dy2Pd1.25Ge2.75 have been synthesized using the arc-melting method. The crystallographic structure and magnetic, electronic transport, and thermal properties are reported. The crystal structure obtained from powder x-ray diffraction analysis suggests that these compounds crystallize in the AlB2-type structure (space group P6/mmm, no. 191) with lattice parameters a = 4.228 53(5)/4.230 54 (2) Å and c = 3.942 25(9)/3.945 52(5) Å for the compounds with Tb and Dy respectively. The ac and dc magnetic susceptibility studies reveal spin-glass like behavior, with freezing temperature T f = 10.5 K for Tb2Pd1.25Ge2.75 and 4.5 K for Dy2Pd1.25Ge2.75. These data are in good agreement with the heat capacity measurements.
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Affiliation(s)
- L S Litzbarski
- Faculty of Applied Physics and Mathematics and Center for Future Materials, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
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Shukla V. Observation of critical magnetic behavior in 2D carbon based composites. NANOSCALE ADVANCES 2020; 2:962-990. [PMID: 36133050 PMCID: PMC9418615 DOI: 10.1039/c9na00663j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 01/08/2020] [Indexed: 05/30/2023]
Abstract
Two dimensional (2D) carbonaceous materials such as graphene and its derivatives, e.g., graphdiyne, have enormous potential possibilities in major fields of scientific research. Theoretically, it has been proposed that the perfect atomic lattice arrangement of these materials is responsible for their outstanding physical and chemical properties, and also for their poor magnetic properties. Experimentally, it is difficult to obtain a perfect atomic lattice of carbon atoms due to the appearance of structural disorder. This structural disorder is generated during the growth or synthesis of carbon-related materials. Investigations of structural disorder reveal that it can offer both advantages and disadvantages depending on the application. For instance, disorder reduces the thermal and mechanical stability, and deteriorates the performance of 2D carbon-based electronic devices. The most interesting effect of structural disorder can be seen in the field of magnetism. Disorder not only creates magnetic ordering within 2D carbon materials but also influences the local electronic structure, which opens the door for future spintronic devices. Although various studies on the disorder induced magnetism of 2D carbon materials are available in the literature, some parts of the above field have still not been fully exploited. This review presents existing work for the future development of 2D carbon-based devices.
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Affiliation(s)
- Vineeta Shukla
- Nuclear Condensed Matter Physics Laboratory, Department of Physics, Indian Institute of Technology Kharagpur-721302 India
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Wang K, Cheng Y, Tu B, Tao H. Synthesis of Ferrosoferric Oxide‐graphene Oxide Nanocomposite by Isoelectric Point Method for the Detection of Catechol. ELECTROANAL 2019. [DOI: 10.1002/elan.201900419] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Kaiqian Wang
- Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials ScienceAnhui Normal University Wuhu 241000 China
| | - Yalin Cheng
- Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, College of Environmental Science and EngineeringAnhui Normal University Wuhu 241000 China
| | - Biyang Tu
- Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, College of Environmental Science and EngineeringAnhui Normal University Wuhu 241000 China
| | - Haisheng Tao
- Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials ScienceAnhui Normal University Wuhu 241000 China
- Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, College of Environmental Science and EngineeringAnhui Normal University Wuhu 241000 China
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