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Santos RV, Cabrera-Pasca GA, Costa CS, Bosch-Santos B, Otubo L, Pereira LFD, Correa BS, Effenberger FB, Burimova A, Freitas RS, Carbonari AW. Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer. Sci Rep 2021; 11:21028. [PMID: 34697397 PMCID: PMC8546082 DOI: 10.1038/s41598-021-99810-y] [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: 07/02/2021] [Accepted: 09/30/2021] [Indexed: 11/17/2022] Open
Abstract
We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10–670 K) by using radioactive \documentclass[12pt]{minimal}
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\begin{document}$$^{111}$$\end{document}111Cd) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC–FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.
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Affiliation(s)
- Renata V Santos
- Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM, Universidade Federal do Pará, Ananindeua, PA, 67130-660, Brazil
| | - Gabriel A Cabrera-Pasca
- Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM, Universidade Federal do Pará, Ananindeua, PA, 67130-660, Brazil.,Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará, Abaetetuba, PA, 68440-000, Brazil
| | - Cleidilane S Costa
- Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM, Universidade Federal do Pará, Ananindeua, PA, 67130-660, Brazil.,Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará, Abaetetuba, PA, 68440-000, Brazil
| | - Brianna Bosch-Santos
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Larissa Otubo
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Luciano F D Pereira
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Bruno S Correa
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Fernando B Effenberger
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Anastasia Burimova
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil
| | - Rafael S Freitas
- Instituto de Física, Universidade de São Paulo, São Paulo, SP, 05508-090, Brazil
| | - Artur W Carbonari
- Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, 05508-000, São Paulo, SP, Brazil.
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Tojo C, Buceta D, López-Quintela MA. On the minimum reactant concentration required to prepare Au/M core-shell nanoparticles by the one-pot microemulsion route. PHYSICAL SCIENCES REVIEWS 2019. [DOI: 10.1515/psr-2018-0045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe minimum reactant concentration required to synthesize Au/M (M = Ag, Pt, Pd, Ru …) core-shell nanoparticles by the one-pot microemulsion route was calculated by a simulation model under different synthesis conditions. This minimum concentration was proved to depend on the reduction potential of the slower metal M and on the rigidity of the surfactant film composing the microemulsion. Model results were tested by comparing with Au/M nanoparticles taken from literature. In all cases, experimental data obey model predictions. From this agreement, one can conclude that the smaller the standard potential of the slower reduction metal, the lower the minimum concentration needed to obtain core-shell nanoparticles. In addition, the higher the surfactant flexibility, the higher the minimum concentration to synthesize metal segregated nanoparticles. Model prediction allows to quantify which is the best value of concentration to prepare different pairs of core-shell Au/M nanoparticles in terms of nature of M metal in the couple and microemulsion composition. This outlook may become an advanced tool for fine-tuning Au/M nanostructures.Graphical Abstract:
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Affiliation(s)
- C. Tojo
- Faculty of Chemistry, Department of Physical Chemistry, University of Vigo, Vigo, Galicia E-36310, Spain
| | - D. Buceta
- Facultade de Quimica, Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, Santiago de Compostela,GaliciaE-15782, Spain
| | - M. A. López-Quintela
- Facultade de Quimica, Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, Santiago de Compostela,GaliciaE-15782, Spain
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Nayak C, Bhattacharyya D, Bhattacharyya K, Tripathi AK, Bapat RD, Jha SN, Sahoo NK. Insight into growth of Au-Pt bimetallic nanoparticles: an in situ XAS study. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:825-835. [PMID: 28664890 DOI: 10.1107/s1600577517006257] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 04/25/2017] [Indexed: 05/03/2023]
Abstract
Au-Pt bimetallic nanoparticles have been synthesized through a one-pot synthesis route from their respective chloride precursors using block copolymer as a stabilizer. Growth of the nanoparticles has been studied by simultaneous in situ measurement of X-ray absorption spectroscopy (XAS) and UV-Vis spectroscopy at the energy-dispersive EXAFS beamline (BL-08) at Indus-2 SRS at RRCAT, Indore, India. In situ XAS spectra, comprising both X-ray near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) parts, have been measured simultaneously at the Au and Pt L3-edges. While the XANES spectra of the precursors provide real-time information on the reduction process, the EXAFS spectra reveal the structure of the clusters formed in the intermediate stages of growth. This insight into the formation process throws light on how the difference in the reduction potential of the two precursors could be used to obtain the core-shell-type configuration of a bimetallic alloy in a one-pot synthesis method. The core-shell-type structure of the nanoparticles has also been confirmed by ex situ energy-dispersive spectroscopy line-scan and X-ray photoelectron spectroscopy measurements with in situ ion etching on fully formed nanoparticles.
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Affiliation(s)
- Chandrani Nayak
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - K Bhattacharyya
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - A K Tripathi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - R D Bapat
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - N K Sahoo
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Habrioux A, Vogel W, Guinel M, Guetaz L, Servat K, Kokoh B, Alonso-Vante N. Structural and electrochemical studies of Au–Pt nanoalloys. Phys Chem Chem Phys 2009; 11:3573-9. [DOI: 10.1039/b820668f] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Shen X, Chen X, Liu JH, Huang XJ. Free standing Pt–Au bimetallic membranes with a leaf-like nanostructure from agarose-mediated electrodeposition and oxygen gas sensing in room temperature ionic liquids. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b914161h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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