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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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Zatsepin AF, Kuznetsova YA, Trofimova ES, Pustovarov VA. Excited states of modified oxygen-deficient centers and Si quantum dots in Gd-implanted silica glasses: emission dynamics and lifetime distributions. Phys Chem Chem Phys 2021; 23:23184-23195. [PMID: 34622256 DOI: 10.1039/d1cp03826e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The emission centers and excited state characteristics of silica glasses implanted with Gd ions were studied by time-resolved pulsed cathodoluminescence. It was found that in the process of ion implantation, two types of new emission centers associated with Gd ions as well as Si quantum dots are formed in glassy silica. The distributions of excited states over the lifetime were found for both new centers and Si quantum dots. The nature of dispersion of the emission decay time was discussed in terms of structural disorder in the matrix. Thermal annealing and an increase in the ion fluence lead to the stimulation of the formation of Gd-related new centers and Si quantum dots. The micromechanisms for the formation of new Gd-related centers and two types of Si quantum dots were proposed on the basis of two scenarios for the introduction of Gd ions into the SiO2 network: insertion of Gd into interstitial voids near oxygen-deficient centers and Gd → Si substitution with subsequent expulsion of Si atoms to the interstitial voids. New emission oxygen-deficient centers and quantum dots created by ion-beam technology in silica glasses are of interest for the development of new functional materials for photonics, and micro- and opto-electronics.
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Affiliation(s)
- A F Zatsepin
- Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia.
| | - Yu A Kuznetsova
- Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia.
| | - E S Trofimova
- Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia.
| | - V A Pustovarov
- Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia.
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Hariwal R, Malik HK, Negi A, Kandasami A. Controlling room temperature ferromagnetism and band gap in ZnO nanostructured thin films by varying angle of implantation. RSC Adv 2018; 8:6278-6287. [PMID: 35540397 PMCID: PMC9078269 DOI: 10.1039/c7ra10615g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 01/30/2018] [Indexed: 01/29/2023] Open
Abstract
The defects in the host lattice play a major role in tuning the surface roughness, optical band gap and the room temperature ferromagnetism of ZnO thin films.
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Affiliation(s)
| | - Hitendra K. Malik
- Department of Physics
- Indian Institute of Technology Delhi
- New Delhi-110016
- India
| | - Ambika Negi
- Department of Physics
- Acharya Narendra Dev College
- University of Delhi
- New Delhi-110019
- India
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Kozlovskiy AL, Shlimas DI, Zdorovets MV, Mashentseva AA, Kadyrzhanov KK. Thermal annealing-induced modification of the structure and electrical conductivity of metallic nanotubes embedded in PET track-etched membranes. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0268-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Li F, Li Z, Tan L, Zhou Y, Ma J, Lysevych M, Fu L, Tan HH, Jagadish C. Radiation effects on GaAs/AlGaAs core/shell ensemble nanowires and nanowire infrared photodetectors. NANOTECHNOLOGY 2017; 28:125702. [PMID: 28140378 DOI: 10.1088/1361-6528/aa5bad] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
With the recent advances in nanowire (NW) growth and fabrication, there has been rapid development and application of GaAs NWs in optoelectronics. It is also of importance to study the radiation tolerance of optoelectronic nano-devices for atomic energy and space-based applications. Here, photoluminescence (PL) and time-resolved photoluminescence measurements were carried out on GaAs/AlGaAs core/shell NWs at room temperature before and after 1 MeV proton irradiation with fluences ranging from 1.0 × 1012-3.0 × 1013 cm-2. It is found that the GaAs/AlGaAs core/shell NWs with smaller diameter show much less PL degradation compared with the ones with larger diameters. The increased radiation hardness is mainly attributed to the improvement of a room temperature dynamic-annealing mechanism near the surface of the NWs. We also found that the minority carrier lifetime is closely related to both the PL intensity and defect density induced by irradiation. Finally, GaAs/AlGaAs ensemble NW photodetectors operating in the near-infrared spectral regime have been demonstrated. The influence of proton irradiation on light and dark current characteristics also indicates that NW structures are a good potential candidate for radiation harsh-environment applications.
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Affiliation(s)
- Fajun Li
- National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, People's Republic of China. Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra 2601, A.C.T., Australia
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Wang SL, Shi XH, Yang Z, Zhang YM, Shen LR, Lei ZY, Zhang ZQ, Cao C, Fan DL. Osteopontin (OPN) is an important protein to mediate improvements in the biocompatibility of C ion-implanted silicone rubber. PLoS One 2014; 9:e98320. [PMID: 24911051 PMCID: PMC4049582 DOI: 10.1371/journal.pone.0098320] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Accepted: 05/01/2014] [Indexed: 01/15/2023] Open
Abstract
Medical device implants are drawing increasing amounts of interest from modern medical practitioners. However, this attention is not evenly spread across all such devices; most of these implantable devices can cause adverse reactions such as inflammation, fibrosis, thrombosis, and infection. In this work, the biocompatibility of silicone rubber (SR) was improved through carbon (C) ion implantation. Scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) results confirmed that these newly generated carbon-implanted silicone rubbers (C-SRs) had large, irregular peaks and deep valleys on their surfaces. The water contact angle of the SR surface decreased significantly after C ion implantation. C ion implantation also changed the surface charge distribution, silicone oxygen rate, and chemical-element distribution of SR to favor cell attachment. The dermal fibroblasts cultured on the surface C-SR grew faster and showed more typical fibroblastic shapes. The expression levels of major adhesion proteins, including talin-1, zyxin, and vinculin, were significantly higher in dermal fibroblasts cultured on C-SR coated plates than in dermal fibroblasts cultured on SR. Those same dermal fibroblasts on C-SRs showed more pronounced adhesion and migration abilities. Osteopontin (OPN), a critical extracellular matrix (ECM) protein, was up-regulated and secreted from dermal fibroblasts cultured on C-SR. Matrix metalloproteinase-9 (MMP-9) activity was also increased. These cells were highly mobile and were able to adhere to surfaces, but these abilities were inhibited by the monoclonal antibody against OPN, or by shRNA-mediated MMP-9 knockdown. Together, these results suggest that C ion implantation significantly improves SR biocompatibility, and that OPN is important to promote cell adhesion to the C-SR surface.
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Affiliation(s)
- Shao-liang Wang
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Xiao-hua Shi
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Zhi Yang
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Yi-ming Zhang
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Li-ru Shen
- Southwestern Institute of Physics, Chengdu, Sichuan, People's Republic of China
| | - Ze-yuan Lei
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Zhi-qing Zhang
- Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, People's Republic of China
| | - Cong Cao
- Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, People's Republic of China
- * E-mail: (CC); (DF)
| | - Dong-li Fan
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China
- * E-mail: (CC); (DF)
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