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Das A, Kaur A, Kaur P. Hydrostatic pressure-induced reversible phase transformation in iron oxide nanoparticles. NANOSCALE 2024; 16:12650-12659. [PMID: 38887047 DOI: 10.1039/d4nr01443j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
We report hydrostatic pressure-induced reversible phase transformation in maghemite γ-Fe2O3 nanoparticles (cubic → tetragonal → cubic) using an in situ diamond anvil cell (DAC) technique. Thermal arc plasma-synthesized nanoparticles, particularly in a He gas medium, exhibit the reversible phase transformation under pressure ranging from 0 to 2.58 GPa. Rietveld refinement reflects that cubic to tetragonal maghemite phase transformation coexists with a cubic metallic Fe phase at 0.55 GPa pressure. The generation of two new superlattice reflections at 6.93° and 8.11°, respectively, reflects the phase transformation. The presence of a core-shell-type nanostructure observed from transmission electron microscopy micrographs is found to exhibit a spin glass shell-type behavior. This triggers pressure-induced fluctuating magnetization and interparticle interaction-induced surface anisotropy and spin disorder with broken bonds, translational symmetry, and incomplete coordination. This leads to overcoming the nucleation barrier at the surface, subsequently denser nucleation sites and increased nucleation probability. This further leads to an atomic rearrangement and tetragonality in the maghemite phase. Furthermore, with increasing pressure, the reversible structural change, i.e. from the tetragonal to cubic maghemite phase, has been explained in the light of the "internal stress model". The grains are again forced back to the cubic phase via generation of uniform compression along the c-axis and tension along the a and b axes. The spin glass behavior of the core-shell nanostructure along with the "internal stress model" explain the whole reversible phase transformation phenomenon in the γ-Fe2O3 phase.
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Affiliation(s)
- Arkaprava Das
- Chimie des Interaction Plasma surface, Université of Mons, Mons, Belgium.
| | - Anumeet Kaur
- Department of Applied Sciences and Humanities, Global Group of Institutes, Amritsar, Punjab, 143501, India
| | - Parwinder Kaur
- Department of Applied Sciences, Bhai Gurdas Group of Institutes, Sangrur, Punjab 148001, India
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2
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Gálico DA, Rodrigues EM, Halimi I, Toivola J, Zhao H, Xu J, Moilanen JO, Liu X, Hemmer E, Murugesu M. Confining single Er 3+ ions in sub-3 nm NaYF 4 nanoparticles to induce slow relaxation of the magnetisation. Nat Commun 2024; 15:3498. [PMID: 38664382 PMCID: PMC11045814 DOI: 10.1038/s41467-024-47682-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
Molecular systems known as single-molecule magnets (SMMs) exhibit magnet-like behaviour of slow relaxation of the magnetisation and magnetic hysteresis and have potential application in high-density memory storage or quantum computing. Often, their intrinsic magnetic properties are plagued by low-energy molecular vibrations that lead to phonon-induced relaxation processes, however, there is no straightforward synthetic approach for molecular systems that would lead to a small amount of low-energy vibrations and low phonon density of states at the spin-resonance energies. In this work, we apply knowledge accumulated over the last decade in molecular magnetism to nanoparticles, incorporating Er3+ ions in an ultrasmall sub-3 nm diamagnetic NaYF4 nanoparticle (NP) and probing the slow relaxation dynamics intrinsic to the Er3+ ion. Furthermore, by increasing the doping concentration, we also investigate the role of intraparticle interactions within the NP. The knowledge gained from this study is anticipated to enable better design of magnetically high-performance molecular and bulk magnets for a wide variety of applications, such as molecular electronics.
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Affiliation(s)
- Diogo A Gálico
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Emille M Rodrigues
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Ilias Halimi
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Juho Toivola
- Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - He Zhao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Jiahui Xu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Jani O Moilanen
- Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland.
| | - Xiaogang Liu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Eva Hemmer
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
- Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
- Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
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3
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Zhao JW, Wang HY, Feng L, Zhu JZ, Liu JX, Li WX. Crystal-Phase Engineering in Heterogeneous Catalysis. Chem Rev 2024; 124:164-209. [PMID: 38044580 DOI: 10.1021/acs.chemrev.3c00402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
The performance of a chemical reaction is critically dependent on the electronic and/or geometric structures of a material in heterogeneous catalysis. Over the past century, the Sabatier principle has already provided a conceptual framework for optimal catalyst design by adjusting the electronic structure of the catalytic material via a change in composition. Beyond composition, it is essential to recognize that the geometric atomic structures of a catalyst, encompassing terraces, edges, steps, kinks, and corners, have a substantial impact on the activity and selectivity of a chemical reaction. Crystal-phase engineering has the capacity to bring about substantial alterations in the electronic and geometric configurations of a catalyst, enabling control over coordination numbers, morphological features, and the arrangement of surface atoms. Modulating the crystallographic phase is therefore an important strategy for improving the stability, activity, and selectivity of catalytic materials. Nonetheless, a complete understanding of how the performance depends on the crystal phase of a catalyst remains elusive, primarily due to the absence of a molecular-level view of active sites across various crystal phases. In this review, we primarily focus on assessing the dependence of catalytic performance on crystal phases to elucidate the challenges and complexities inherent in heterogeneous catalysis, ultimately aiming for improved catalyst design.
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Affiliation(s)
- Jian-Wen Zhao
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hong-Yue Wang
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Li Feng
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jin-Ze Zhu
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jin-Xun Liu
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Wei-Xue Li
- Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, iChem, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
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4
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Banday A, Shahid R, Gupta M, Murugavel S. Tunable electronic structure of heterosite FePO 4: an in-depth structural study and polaron transport. RSC Adv 2023; 13:18332-18346. [PMID: 37333798 PMCID: PMC10275275 DOI: 10.1039/d3ra01366a] [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: 02/28/2023] [Accepted: 04/18/2023] [Indexed: 06/20/2023] Open
Abstract
The development of better electrode materials for lithium-ion batteries has been intensively investigated both due to their fundamental scientific aspects as well as their usefulness in technological applications. The present technological development of rechargeable batteries is hindered by fundamental challenges, such as low energy and power density, short lifespan, and sluggish charge transport kinetics. Among the various anode materials proposed, heterosite FePO4 (h-FP) has been found to intercalate lithium and sodium ion hosts to obtain novel rechargeable batteries. The h-FP has been obtained via the delithiation of triphylite LiFePO4 (LFP), and its structural and electronic properties have been investigated with different crystallite sizes. The synchrotron XRD measurements followed by Rietveld refinement analysis reveal lattice expansion upon the reduction of crystallite size of h-FP. In addition, the decrease in the crystallite size enhances surface energy contributions, thereby creating more oxygen vacancies up to 2% for 21 nm crystallite size. The expansion in the lattice parameters is reflected in the vibrational properties of the h-FP structure, where the red-shift has been observed in the characteristic modes upon the reduction of crystallite size. The local environment of the transition metal ion and its bonding characteristics have been elucidated through soft X-ray absorption spectroscopy (XAS) with the effect of crystallite size. XAS unequivocally reveals the valence state of iron 3d electrons near the Fermi level, which is susceptible to local lattice distortion and uncovers the detailed information on the evolution of electronic states with crystallite size. The observed local lattice distortion has been considered to be as a result of the decrease in the level of covalency between the Fe-3d and O-2p states. Further, we demonstrate the structural advantages of nanosized h-FP on the transport properties, where an enhancement in the polaronic conductivity with decreasing crystallite size has been observed. The polaronic conduction mechanism has been analyzed and discussed on the basis of the Mott model of polaron conduction along with an insightful analysis on the role of the electronic structure. The present study provides spectroscopic results on the anode material that reveal the evolution of electronic states for fingerprinting, understanding, and optimizing it for advanced rechargeable battery operations.
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Affiliation(s)
- Azeem Banday
- Department of Physics & Astrophysics, University of Delhi Delhi-110007 India
| | - Raza Shahid
- Department of Physics, Jamia Millia Islamia New Delhi-110025 India
| | - Mukul Gupta
- UGC-DAE Consortium for Scientific Research, University Campus Khandwa Road Indore 452 001 India
| | - Sevi Murugavel
- Department of Physics & Astrophysics, University of Delhi Delhi-110007 India
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Nielsen IG, Kløve M, Roelsgaard M, Dippel AC, Iversen BB. In situ X-ray diffraction study of the solvothermal formation mechanism of gallium oxide nanoparticles. NANOSCALE 2023; 15:5284-5292. [PMID: 36810774 DOI: 10.1039/d2nr07128b] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Gallium oxides are of broad interest due to their wide band gaps and attractive photoelectric properties. Typically, the synthesis of gallium oxide nanoparticles is based on a combination of solvent-based methods and subsequent calcination, but detailed information about solvent based formation processes is lacking, and this limits the tailoring of materials. Here we have examined the formation mechanisms and crystal structure transformations of gallium oxides during solvothermal synthesis using in situ X-ray diffraction. γ-Ga2O3 readily forms over a wide range of conditions. In contrast, β-Ga2O3 only forms at high temperatures (T > 300 °C), and it is always preceded by γ-Ga2O3, indicating that γ-Ga2O3 is a crucial part of the formation mechanism of β-Ga2O3. The activation energy for formation of β-Ga2O3 from γ-Ga2O3 is determined to be 90-100 kJ mol-1 in ethanol, water and aqueous NaOH based on kinetic modelling of phase fractions obtained from multi-temperature in situ X-ray diffraction data. At low temperatures GaOOH and Ga5O7OH form in aqueous solvent, but these phases are also obtained from γ-Ga2O3. Systematic exploration of synthesis parameters such as temperature, heating rate, solvent and reaction time reveal that they all affect the resulting product. In general, the solvent based reaction paths are different from reports on solid state calcination studies. This underlines that the solvent is an active part of the solvothermal reactions and to a high degree determines different formation mechanisms.
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Affiliation(s)
- Ida Gjerlevsen Nielsen
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark.
| | - Magnus Kløve
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark.
| | - Martin Roelsgaard
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark.
| | | | - Bo Brummerstedt Iversen
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark.
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6
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Santos C, Attah-Baah JM, Junior RSS, Mâcedo MA, Rezende MVS, Matos RS, Ţălu Ş, Trong DN, da Paz SPA, Angélica RS, Ferreira NS. Insights into the Fe 3+ Doping Effects on the Structure and Electron Distribution of Cr 2O 3 Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:980. [PMID: 36985876 PMCID: PMC10059910 DOI: 10.3390/nano13060980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/04/2023] [Accepted: 03/04/2023] [Indexed: 06/18/2023]
Abstract
Herein, we carefully investigated the Fe3+ doping effects on the structure and electron distribution of Cr2O3 nanoparticles using X-ray diffraction analysis (XRD), maximum entropy method (MEM), and density functional theory (DFT) calculations. We showed that increasing the Fe doping induces an enlargement in the axial ratio of c/a, which is associated with an anisotropic expansion of the unit cell. We found that as Fe3+ replaces Cr in the Cr2O3 lattice, it caused a higher interaction between the metal 3d states and the oxygen 2p states, which led to a slight increase in the Cr/Fe-O1 bond length followed by an opposite effect for the Cr/Fe-O2 bonds. Our results also suggest that the excitations characterize a well-localized bandgap region from occupied Cr d to unoccupied Fe d states. The Cr2O3 and Fe-doped Cr2O3 nanoparticles behave as Mott-Hubbard insulators due to their band gap being in the d-d gap, and Cr 3d orbitals dominate the conduction band. These findings suggest that the magnitude and the character of the electronic density near the O atom bonds in Cr2O3 nanoparticles are modulated by the Cr-Cr distances until its stabilization at the induced quasi-equilibrium of the Cr2O3 lattice when the Fe3+ doping values reaches the saturation level range.
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Affiliation(s)
- Cledson Santos
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
| | - John M. Attah-Baah
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
| | - Romualdo S. Silva Junior
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
| | - Marcelo A. Mâcedo
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
| | - Marcos V. S. Rezende
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
| | - Robert S. Matos
- Amazonian Materials Group, Federal University of Amapá, Macapá 68902-280, AP, Brazil
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, 15 Constantin Daicoviciu St., 400020 Cluj-Napoca, Romania
| | - Dung Nguyen Trong
- Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi 100000, Vietnam
| | - Simone P. A. da Paz
- Institute of Geosciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Rômulo S. Angélica
- Institute of Geosciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Nilson S. Ferreira
- Department of Physics, Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristóvão 49100-000, SE, Brazil
- PPGCA, Universidade Federal do Amapá, Macapá 68902-280, AP, Brazil
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7
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Fischer J, Han L, Saito T, Dadmun M. When does a macromolecule transition from a polymer chain to a nanoparticle? NANOSCALE ADVANCES 2022; 4:5164-5177. [PMID: 36504741 PMCID: PMC9680937 DOI: 10.1039/d2na00617k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 10/31/2022] [Indexed: 06/17/2023]
Abstract
Frequently, the defining characteristic of a nanoparticle is simply its size, where objects that are 1-100 nm are characterized as nanoparticles. However, synthetic and biological macromolecules, in particular high molecular weight chains, can satisfy this size requirement without providing the same phenomena as one would expect from a nanoparticle. At the same time, soft polymer nanoparticles are important in a broad range of fields, including understanding protein folding, drug delivery, vitrimers, catalysis and nanomedicine. Moreover, the recent flourish of all polymer nanocomposites has led to the synthesis of soft all-polymer nanoparticles, which emerge from internal crosslinking of a macromolecule. Thus, there exists a transition of an internally crosslinked macromolecule from a polymer chain to a nanoparticle as the amount of internal crosslinks increases, where the polymer chain exhibits different behavior than the nanoparticle. Yet, this transition is not well understood. In this work, we seek to address this knowledge gap and determine the transition of a macromolecule from a polymer chain to a nanoparticle as internal crosslinking increases. In this work, small angle neutron scattering (SANS) offers insight into the structure of polystyrene and poly(ethyl hexyl methacrylate) nanostructures in dilute solutions, with crosslinking densities that vary from 0.1 to 10.7%. Analyses of the SANS data provides structural characteristics to classify a nanostructure as chain-like or particle-like and identify a crosslinking dependent transition between the two morphologies. It was found that for both types of polymeric nanostructures, a crosslinking density of 0.81% (∼ a crosslink for every 1 in 125 monomers) or higher exhibit clear particle-like behavior. Lower crosslinking density nanostructures showed amounts of collapse similar to that of a star polymer (0.1% XL) or a random walk polymer chain (0.4% XL). Thus, the transition of an internally crosslinked macromolecule from a polymer chain to a nanoparticle is not an abrupt transition but occurs via the gradual contraction of the chain with incorporated crosslinks.
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Affiliation(s)
- Jacob Fischer
- Department of Chemistry, University of Tennessee Knoxville Tennessee USA
| | - Lu Han
- Chemical Sciences Division, Oak Ridge National Lab Oak Ridge Tennessee USA
| | - Tomonori Saito
- Chemical Sciences Division, Oak Ridge National Lab Oak Ridge Tennessee USA
| | - Mark Dadmun
- Department of Chemistry, University of Tennessee Knoxville Tennessee USA
- Chemical Sciences Division, Oak Ridge National Lab Oak Ridge Tennessee USA
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8
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Schroer MA, Levish A, Yildizlar Y, Stepponat M, Winterer M. A versatile chemical vapor synthesis reactor for in situ x-ray scattering and spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:113706. [PMID: 36461417 DOI: 10.1063/5.0122461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 10/16/2022] [Indexed: 06/17/2023]
Abstract
We describe a versatile reactor system for chemical vapor synthesis of nanoparticles, which enables in situ investigations of high temperature gas phase particle formation and transformation processes by x-ray scattering and x-ray absorption spectroscopy. The system employs an inductively heated hot wall reactor as the energy source to start nanoparticle formation from a mixture of precursor vapor and oxygen. By use of a modular set of susceptor segments, it is especially possible to change solely the residence time of the gas mixture while keeping all other process parameters (temperature, gas flow, pressure) constant. Corresponding time-temperature profiles are supported by computational fluid dynamics simulations. The operation of the system is demonstrated for two example studies: tin oxide nanoparticle formation studied by small angle x-ray scattering and iron oxide nanoparticle formation by x-ray absorption spectroscopy.
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Affiliation(s)
- Martin A Schroer
- Nanoparticle Process Technology (NPPT), Faculty of Engineering and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
| | - Alexander Levish
- Nanoparticle Process Technology (NPPT), Faculty of Engineering and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
| | - Yasin Yildizlar
- Nanoparticle Process Technology (NPPT), Faculty of Engineering and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
| | - Maximilian Stepponat
- Nanoparticle Process Technology (NPPT), Faculty of Engineering and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
| | - Markus Winterer
- Nanoparticle Process Technology (NPPT), Faculty of Engineering and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
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9
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Formation of polymorphs and pores in small nanocrystalline iron oxide particles. Sci Rep 2022; 12:15291. [PMID: 36097019 PMCID: PMC9467998 DOI: 10.1038/s41598-022-19276-4] [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: 07/01/2022] [Accepted: 08/26/2022] [Indexed: 11/17/2022] Open
Abstract
A novel chemical vapor synthesis reactor design is used to control the pore-particle mesostructure and investigate the pore formation mechanism through the variation of residence time in oxygen. This enables the exploitation of the Kirkendall effect at the nanoscale to generate ultrasmall pores in small nanocrystalline iron oxide particles. Detailed structural characterization and quantitative data analysis of complementary high resolution transmission electron microscopy images, X-ray diffractograms, nitrogen sorption isotherms and X-ray absorption spectra provide a consistent comprehensive picture of the hollow nanoparticles from the local to the microstructure. The pore formation mechanism seems to play a key role for β-Fe2O3 polymorph formation.
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10
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Spivakov A, Lin CR, Tsai CY, Chen YZ. Size-Dependent Magnetic and Magneto-Optical Properties of Bi-Doped Yttrium Iron Garnet Nanopowders. NANOSCALE RESEARCH LETTERS 2022; 17:70. [PMID: 35925519 PMCID: PMC9352828 DOI: 10.1186/s11671-022-03709-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Bi-doped yttrium iron garnet nanopowders were successfully synthesized by a combustion method at different synthesis conditions, and the evolution of their structural, magnetic, and magneto-optical properties has been studied by various methods. X-ray diffraction analysis revealed that crystallite size increases with increase as in annealing time (tA) well as in annealing temperature (TA) and varied from 15.2 nm (TA = 650 °C, tA = 0.5 h) to 44.5 nm (TA = 800 °C, tA = 12 h). The magnetic hysteresis loops exhibit behavior characteristic of soft magnetic materials; herewith, the saturation magnetization demonstrates a growing trend with increasing crystallite size (D). The behavior of the coercivity indicates that, at room temperature, the transition between single-domain and multidomain states occurs at D = 35.3 nm. It was found that the size effect in the MCD spectra is clearly observed for the samples with crystallite sizes less than 42.2 nm for an intersublattice charge-transfer transition and a crystal-field tetrahedral transition. The influence of cation redistribution on the observed changes has been discussed.
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Affiliation(s)
- Aleksandr Spivakov
- Department of Applied Physics, National Pingtung University, No. 4-18 Minsheng Rd., Pingtung County, 90003, Taiwan
| | - Chun-Rong Lin
- Department of Applied Physics, National Pingtung University, No. 4-18 Minsheng Rd., Pingtung County, 90003, Taiwan.
| | - Chang-Yen Tsai
- Department of Applied Physics, National Pingtung University, No. 4-18 Minsheng Rd., Pingtung County, 90003, Taiwan
| | - Ying-Zhen Chen
- Department of Applied Physics, National Pingtung University, No. 4-18 Minsheng Rd., Pingtung County, 90003, Taiwan
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11
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Jurkiewicz K, Kamiński M, Bródka A, Burian A. Atomistic origin of nano-silver paracrystalline structure: molecular dynamics and x-ray diffraction studies. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:375401. [PMID: 35772380 DOI: 10.1088/1361-648x/ac7d84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
Classical molecular dynamics (MD) and x-ray diffraction (XRD) have been used to establish the origin of the paracrystalline structure of silver nanoparticles at the atomic scale. Models based on the face-centred cubic structure have been computer generated and their atomic arrangements have been optimized by the MD with the embedded-atom model (EAM) potential and its modified version (MEAM). The simulation results are compared with the experimental XRD data in reciprocal and real spaces, i.e. the structure factor and the pair distribution function. The applied approach returns the structural models, defined by the Cartesian coordinates of the constituent atoms. It has been found that most of the structural features of Ag nanoparticles are better reproduced by the MEAM. The presence of vacancy defects in the structure of the Ag nanoparticles has been considered and the average concentration of vacancies is estimated to be 3 at.%. The average nearest-neighbour Ag-Ag distances and the coordination numbers are determined and compared with the values predicted for the bulk Ag, demonstrating a different degree of structural disorder on the surface and in the core, compared to the bulk crystalline counterpart. It has been shown that the paracrystalline structure of the Ag nanoparticles has origin in the surface disorder and the disorder generated by the presence of the vacancy defects. Both sources lead to network distortion that propagates proportionally to the square root of the interatomic distances.
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Affiliation(s)
- Karolina Jurkiewicz
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Michał Kamiński
- Deutsches Elektronen-Synchrotron, Photon Science, Notkestraße 85, D-22607 Hamburg, Germany
| | - Aleksander Bródka
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Andrzej Burian
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
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12
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Fukina DG, Koryagin AV, Titaev DN, Suleimanov EV, Kirillova NI, Boryakov AV, Mitin AV. The photocatalytic oxidation ability of Rb0.9Nb1.625Mo0.375O5.62 with classic β‐pyrochlore structure. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Diana G Fukina
- N. I. Lobachevsky State University of Nizhny Novgorod Institute of Chemistry 23 Gagarin Avenue 603022 Nizhny Novgorod RUSSIAN FEDERATION
| | - Andrey V. Koryagin
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Insitute of Chemistry RUSSIAN FEDERATION
| | - Dmitry N. Titaev
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Institute of Chemistry RUSSIAN FEDERATION
| | - Eugeny V. Suleimanov
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Institute of Chemistry RUSSIAN FEDERATION
| | - Natalia I. Kirillova
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Insitute of Chemistry RUSSIAN FEDERATION
| | - Aleksey V. Boryakov
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Institute of Chemistry RUSSIAN FEDERATION
| | - Aleksandr V. Mitin
- Lobachevsky State University of Nizhni Novgorod: Nacional'nyj issledovatel'skij Nizegorodskij gosudarstvennyj universitet imeni N I Lobacevskogo Insitute of Chemistry RUSSIAN FEDERATION
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13
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Boiko V, Dai Z, Chaika M, Grzeszkiewicz K, Li J, Strek W, Hreniak D. Size-Dependent Persistent Luminescence of YAGG:Cr3+ Nanophosphors. MATERIALS 2022; 15:ma15134407. [PMID: 35806532 PMCID: PMC9267483 DOI: 10.3390/ma15134407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/18/2022] [Accepted: 06/19/2022] [Indexed: 02/07/2023]
Abstract
In the current work, YAGG:Cr3+ nanophosphors were synthesized by the Pechini method and then annealed at different temperatures in the range 800–1300 °C. The structure and morphology of the samples were characterized by X-ray Powder Diffraction (XRPD). The lattice parameters and average crystalline sizes as site occupation by Al3+ and Ga3+ ions were calculated from the Rietveld refinement data. To investigate the effect of crystalline size of the materials on their optical properties: excitation and emission spectra were recorded and analyzed. Finally, the effect of crystalline size on the probability of carrier recombination leading to PersL was determined experimentally with thermoluminescence analyses. The Tmax-Tstop method was applied to determine the trap type and particle size (calcination temperature) effect on their redistribution. A correlation between structural changes and trap redistribution was found. In particular, the extinction of high-temperature TL maximum with increasing annealing temperatures is observed, while low-temperature TL maximum increases and reaches a maximum when the lattice parameter reaches saturation.
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Affiliation(s)
- Vitalii Boiko
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
- Correspondence:
| | - Zhengfa Dai
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
- Key Laboratory of Transparent Opto-Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China; (Z.D.); (J.L.)
| | - Mykhailo Chaika
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
| | - Karina Grzeszkiewicz
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
| | - Jiang Li
- Key Laboratory of Transparent Opto-Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China; (Z.D.); (J.L.)
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wieslaw Strek
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
| | - Dariusz Hreniak
- Division of Optical Spectroscopy, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, PL 50-422 Wroclaw, Poland; (M.C.); (K.G.); (W.S.); (D.H.)
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14
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Li Y, Zhou Z. Small-size and high-crystallinity β-NaLuF4 nanocrystals synthesized by automatic nanomaterial synthesizer. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Shi R, Brites CDS, Carlos LD. Hexagonal-phase NaREF 4 upconversion nanocrystals: the matter of crystal structure. NANOSCALE 2021; 13:19771-19782. [PMID: 34821890 DOI: 10.1039/d1nr04209b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The hexagonal-phase (β) of NaREF4 upconversion nanocrystals (RE = rare earth elements) has been widely employed because of the outstanding luminescence performance, yet less is known about the essence of this superior property. The current understanding of this issue is raised from the advantage of weak electron-vibration interactions in fluoride systems, while the interpretability of this statement is controversial and contradictory results are commonly reported. One feasible way to solve this puzzle is from the aspect of "structure-property" relationship, yet even after decades of investigation, the structural details of β-NaREF4 are still under debate. Herein, the reported results relevant to this topic are reviewed, and the conflicting viewpoints are summarized. The similarities and differences between different lattice templates are assessed, and the reasons underlying the divergence are analysed. Based on these discussions, it is realized that the crystal structure of β-NaREF4 should be more reliably depicted as one flexible lattice framework with complex characteristics, and the structural disorder induced by atom displacements in the lattice is probably the key to supporting the superior luminescence properties of β-NaREF4 nanocrystals.
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Affiliation(s)
- Rui Shi
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Carlos D S Brites
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Luís D Carlos
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
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16
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Yang RX, Tan LZ. Understanding size dependence of phase stability and band gap in CsPbI3 perovskite nanocrystals. J Chem Phys 2020; 152:034702. [DOI: 10.1063/1.5128016] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ruo Xi Yang
- Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
| | - Liang Z. Tan
- Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
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17
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Anticancerous Activity of Transition Metal Oxide Nanoparticles. Nanobiomedicine (Rij) 2020. [DOI: 10.1007/978-981-32-9898-9_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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18
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Suresh M, Jeevanandam J, Chan YS, Danquah MK, Kalaiarasi JMV. Opportunities for Metal Oxide Nanoparticles as a Potential Mosquitocide. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00703-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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19
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Jeevanandam J, Chan YS, Danquah MK, Law MC. Cytotoxicity Analysis of Morphologically Different Sol-Gel-Synthesized MgO Nanoparticles and Their In Vitro Insulin Resistance Reversal Ability in Adipose cells. Appl Biochem Biotechnol 2019; 190:1385-1410. [PMID: 31776944 DOI: 10.1007/s12010-019-03166-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 10/23/2019] [Indexed: 12/19/2022]
Abstract
Insulin resistance is one of the major factors that leads to type 2 diabetes. Although insulin therapies have been shown to overcome insulin resistance, overweight and hypoglycemia are still observed in most cases. The disadvantages of insulin therapies have driven the interest in developing novel curative agents with enhanced insulin resistance reversibility. Magnesium deficiency has also been recognized as a common problem which leads to insulin resistance in both type 1 and 2 diabetes. Oxide nanoparticles demonstrate highly tunable physicochemical properties that can be exploited by engineers to develop unique oxide nanoparticles for tailored applications. Magnesium supplements for diabetic cells have been reported to increase the insulin resistance reversibility. Hence, it is hypothesized that magnesium oxide (MgO) nanoparticles could be molecularly engineered to offer enhanced therapeutic efficacy in reversing insulin resistance. In the present work, morphologically different MgO nanoparticles were synthesized and evaluated for biophysical characteristics, biocompatibility, cytotoxicity, and insulin resistance reversibility. MTT assay revealed that hexagonally shaped MgO nanoparticles are less toxic to 3T3-L1 adipose cells (diabetic) compared with spherically and rod-shaped MgO nanoparticles. MTT assays using VERO cells (normal, non-diabetic) showed that 400 μg/ml of hexagonal MgO nanoparticles were less toxic to both diabetic and non-diabetic cells. DNS glucose assay and western blot showed that hexagonally shaped MgO nanoparticles had reversed 29.5% of insulin resistance whilst fluorescence microscopy studies indicated that the insulin resistance reversal is due to the activation of intracellular enzymes. The probable mechanism for MgO nanoparticles to induce cytotoxic effect and insulin resistance reversal is discussed.
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Affiliation(s)
- Jaison Jeevanandam
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, CDT 250, 98009, Miri, Sarawak, Malaysia
| | - Yen San Chan
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, CDT 250, 98009, Miri, Sarawak, Malaysia.
| | - Michael K Danquah
- Chemical Engineering Department, University of Tennessee, Chattanooga, TN, 37403, USA
| | - Ming Chiat Law
- Department of Mechanical Engineering, Faculty of Engineering and Science, Curtin University, CDT 250, 98009, Miri, Sarawak, Malaysia
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20
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Bai F, Zhang J, Yuan Y, Liu H, Li X, Chueh CC, Yan H, Zhu Z, Jen AKY. A 0D/3D Heterostructured All-Inorganic Halide Perovskite Solar Cell with High Performance and Enhanced Phase Stability. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1904735. [PMID: 31608506 DOI: 10.1002/adma.201904735] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/09/2019] [Indexed: 05/24/2023]
Abstract
Although organic-inorganic hybrid perovskite solar cells (PVSCs) have achieved dramatic improvement in device efficiency, their long-term stability remains a major concern prior to commercialization. To address this issue, extensive research efforts are dedicated to exploiting all-inorganic PVSCs by using cesium (Cs)-based perovskite materials, such as α-CsPbI3 . However, the black-phase CsPbI3 (cubic α-CsPbI3 and orthorhombic γ-CsPbI3 phases) is not stable at room temperature, and it tends to convert to the nonperovskite δ-CsPbI3 phase. Here, a simple yet effective approach is described to prepare stable black-phase CsPbI3 by forming a heterostructure comprising 0D Cs4 PbI6 and γ-CsPbI3 through tuning the stoichiometry of the precursors between CsI and PbI. Such heterostructure is manifested to enable the realization of a stable all-inorganic PVSC with a high power conversion efficiency of 16.39%. This work provides a new perspective for developing high-performance and stable all-inorganic PVSCs.
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Affiliation(s)
- Fujin Bai
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Jie Zhang
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Yufei Yuan
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Hongbin Liu
- Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Xiaosong Li
- Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Chu-Chen Chueh
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan
| | - He Yan
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Zonglong Zhu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Alex K-Y Jen
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
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Fakharuddin A, Shabbir U, Qiu W, Iqbal T, Sultan M, Heremans P, Schmidt-Mende L. Inorganic and Layered Perovskites for Optoelectronic Devices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807095. [PMID: 31012172 DOI: 10.1002/adma.201807095] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 02/22/2019] [Indexed: 05/25/2023]
Abstract
Organic-inorganic halide perovskites are making breakthroughs in a range of optoelectronic devices. Reports of >23% certified power conversion efficiency in photovoltaic devices, external quantum efficiency >21% in light-emitting diodes (LEDs), continuous-wave lasing and ultralow lasing thresholds in optically pumped lasers, and detectivity in photodetectors on a par with commercial GaAs rivals are being witnessed, making them the fastest ever emerging material technology. Still, questions on their toxicity and long-term stability raise concerns toward their market entry. The intrinsic instability in these materials arises due to the organic cation, typically the volatile methylamine (MA), which contributes to hysteresis in the current-voltage characteristics and ion migration. Alternative inorganic substitutes to MA, such as cesium, and large organic cations that lead to a layered structure, enhance structural as well as device operational stability. These perovskites also provide a high exciton binding energy that is a prerequisite to enhance radiative emission yield in LEDs. The incorporation of inorganic and layered perovskites, in the form of polycrystalline films or as single-crystalline nanostructure morphologies, is now leading to the demonstration of stable devices with excellent performance parameters. Herein, key developments made in various optoelectronic devices using these perovskites are summarized and an outlook toward stable yet efficient devices is presented.
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Affiliation(s)
- Azhar Fakharuddin
- IMEC, Kapeldreef 75, Heverlee, 3001, Belgium
- Department of Electrical Engineering, KU Leuven, Kasteelpark Arenberg, 3000, Leuven, Belgium
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Umair Shabbir
- Department of Physics, Faculty of Science, University of Gujrat, Gujrat, 50700, Punjab, Pakistan
- Nanoscience and Technology Department, National Centre for Physics, Quaid-I-Azam, University Campus, Islamabad, 44000, Pakistan
| | - Weiming Qiu
- IMEC, Kapeldreef 75, Heverlee, 3001, Belgium
- Department of Electrical Engineering, KU Leuven, Kasteelpark Arenberg, 3000, Leuven, Belgium
| | - Tahir Iqbal
- Department of Physics, Faculty of Science, University of Gujrat, Gujrat, 50700, Punjab, Pakistan
| | - Muhammad Sultan
- Nanoscience and Technology Department, National Centre for Physics, Quaid-I-Azam, University Campus, Islamabad, 44000, Pakistan
| | - Paul Heremans
- IMEC, Kapeldreef 75, Heverlee, 3001, Belgium
- Department of Electrical Engineering, KU Leuven, Kasteelpark Arenberg, 3000, Leuven, Belgium
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22
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Yousry YM, Yao K, Tan X, Mohamed AM, Wang Y, Chen S, Ramakrishna S. Structure and High Performance of Lead-Free (K 0.5Na 0.5)NbO 3 Piezoelectric Nanofibers with Surface-Induced Crystallization at Lowered Temperature. ACS APPLIED MATERIALS & INTERFACES 2019; 11:23503-23511. [PMID: 31252502 DOI: 10.1021/acsami.9b05898] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Lead-free potassium and sodium niobate (KNN) nanofiber webs with random and aligned configurations were prepared by the electrospinning process from polymer-modified chemical solution. The crystallization process, structure, composition, dielectric, ferroelectric, and piezoelectric properties of the nanofibers and nanofiber webs were investigated. Theoretical analysis and experimental results showed that the surface-induced heterogeneous nucleation resulted in the remarkable lower crystallization temperature for the KNN nanofibers with the {100} orientation of the perovskite phase in contrast to the bulk KNN gel and thus well-controlled chemical stoichiometry. Low dielectric loss, large electric polarization, and high piezoelectric performance were obtained in the nanofiber webs. In particular, the aligned nanofiber web exhibited further improved piezoelectric strain and voltage coefficients and higher FOM than their thin film counterparts and is promising for high-performance electromechanical sensor and transducer applications.
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Affiliation(s)
- Yasmin Mohamed Yousry
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Innovis, 138634 , Singapore
- Department of Mechanical Engineering , National University of Singapore , 9 Engineering Drive 1 , 117575 , Singapore
| | - Kui Yao
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Innovis, 138634 , Singapore
| | - Xiaoli Tan
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50011 , United States
| | - Ayman Mahmoud Mohamed
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Innovis, 138634 , Singapore
| | - Yumei Wang
- Department of Mechanical Engineering , National University of Singapore , 9 Engineering Drive 1 , 117575 , Singapore
| | - Shuting Chen
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Innovis, 138634 , Singapore
| | - Seeram Ramakrishna
- Department of Mechanical Engineering , National University of Singapore , 9 Engineering Drive 1 , 117575 , Singapore
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23
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Jeevanandam J, Chan YS, Danquah MK. Effect of pH variations on morphological transformation of biosynthesized MgO nanoparticles. PARTICULATE SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1080/02726351.2019.1566938] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jaison Jeevanandam
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University CDT 250, Miri, Malaysia
| | - Yen San Chan
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University CDT 250, Miri, Malaysia
| | - Michael K. Danquah
- Chemical Engineering Department, University of Tennessee, Chattanooga, TN, USA
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24
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Nasrollahzadeh M, Sajadi SM, Sajjadi M, Issaabadi Z. Applications of Nanotechnology in Daily Life. INTERFACE SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1016/b978-0-12-813586-0.00004-3] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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25
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Nafday D, Sarkar S, Ayyub P, Saha-Dasgupta T. A Reduction in Particle Size Generally Causes Body-Centered-Cubic Metals to Expand but Face-Centered-Cubic Metals to Contract. ACS NANO 2018; 12:7246-7252. [PMID: 29874041 DOI: 10.1021/acsnano.8b03360] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
From a careful analysis of existing data as well as new measurements, we show that the size dependence of the lattice parameters in metal nanoparticles with face-centered cubic (fcc) and body-centered cubic (bcc) symmetries display opposite trends: nanoparticles with fcc structure generally contract with decreasing particle size, while those with bcc structure expand. We present a microscopic explanation for this apparently puzzling behavior based on first-principles simulations. Our results, obtained from a comparison of density functional theory calculations with experimental data, indicate that the nanoparticles are capped by a surface monolayer of oxygen atoms, which is routinely detected by surface-sensitive techniques. The bcc- and fcc-based nanoparticles respond in contrasting fashion to the presence of the oxygen capping layer, and this dictates whether the corresponding lattice parameter would increase or decrease with size reduction. The metal-oxygen bonds at the surface, being shorter and stronger than typical metal-metal bonds, pull the surface metal atoms outward. This outward movement of surface atoms influences the core regions to a larger extent in the relatively open bcc geometry, producing a rather large overall expansion of the cluster, compared to the bulk. In case of fcc clusters, on the other hand, the outward movement of surface metal atoms does not percolate too far inside, resulting in either a smaller net expansion or contraction of the cluster depending on the extent of surface oxygen coverage. Our study therefore provides a convincing physicochemical basis for the correlation between the underlying geometry and the nature of change of the lattice parameters under size reduction.
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Affiliation(s)
- Dhani Nafday
- Department of Condensed Matter Physics and Materials Science , S. N. Bose National Centre for Basic Sciences , Kolkata 700106 , India
| | - Subhrangsu Sarkar
- Department of Condensed Matter Physics and Materials Science , Tata Institute of Fundamental Research , Mumbai 400005 , India
| | - Pushan Ayyub
- Department of Condensed Matter Physics and Materials Science , Tata Institute of Fundamental Research , Mumbai 400005 , India
| | - Tanusri Saha-Dasgupta
- Department of Condensed Matter Physics and Materials Science , S. N. Bose National Centre for Basic Sciences , Kolkata 700106 , India
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26
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Investigation of HfO2 Thin Films on Si by X-ray Photoelectron Spectroscopy, Rutherford Backscattering, Grazing Incidence X-ray Diffraction and Variable Angle Spectroscopic Ellipsometry. CRYSTALS 2018. [DOI: 10.3390/cryst8060248] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Zhai X, Wang Y, Liu X, Liu S, Lei P, Yao S, Song S, Zhou L, Feng J, Zhang H. A Simple Strategy for the Controlled Synthesis of Ultrasmall Hexagonal-Phase NaYF4
:Yb,Er Upconversion Nanocrystals. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xuesong Zhai
- School of Materials Engineering; Yancheng Institute of Technology; Yancheng 224051 P.R. China
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Ying Wang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Shihu Liu
- School of Materials Engineering; Yancheng Institute of Technology; Yancheng 224051 P.R. China
| | - Pengpeng Lei
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Shuang Yao
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Shuyan Song
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Liang Zhou
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Jing Feng
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
| | - Hongjie Zhang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P.R. China
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28
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Li Y, Li Y, Wang R, Xu Y, Zheng W, Liu Z. First-Principles Calculation of Phase/Size Characteristic in Yb3+/Tm3+/ZnO Upconversion Nanoparticles through Metal Ga3+Doping. ChemistrySelect 2017. [DOI: 10.1002/slct.201700561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yuemei Li
- School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin, Heilongjiang 150001 China
| | - Yongmei Li
- Key Laboratory of Hormones and Development (Ministry of Health); Tianjin Key Laboratory of Metabolic Diseases; Tianjin Metabolic Diseases Hospital & Tianjin Institute of Endocrinology; Tianjin Medical University; 300070 Tianjin China
| | - Rui Wang
- School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin, Heilongjiang 150001 China
| | - Yanling Xu
- School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin, Heilongjiang 150001 China
| | - Wei Zheng
- School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin, Heilongjiang 150001 China
| | - Zhihua Liu
- School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin, Heilongjiang 150001 China
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29
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Jadhav AP, Khan S, Kim SJ, Lee SY, Park JK, Cho SH. Near-infrared quantum cutting in Tb3+ and Yb3+-doped Y2O3 nanophosphors. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-016-2427-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Jeevanandam J, Chan YS, Danquah MK. Biosynthesis and characterization of MgO nanoparticles from plant extracts via induced molecular nucleation. NEW J CHEM 2017. [DOI: 10.1039/c6nj03176e] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We synthesized 18–80 nm sized MgO nanoparticles using three different leaf extracts with biophysical characteristics.
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Affiliation(s)
- Jaison Jeevanandam
- Department of Chemical Engineering
- Faculty of Engineering and Science
- Miri
- Malaysia
| | - Yen San Chan
- Department of Chemical Engineering
- Faculty of Engineering and Science
- Miri
- Malaysia
| | - Michael K. Danquah
- Department of Chemical Engineering
- Faculty of Engineering and Science
- Miri
- Malaysia
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31
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Lenczewska K, Stefanski M, Hreniak D. Synthesis, structure and NIR luminescence properties of Yb3+ and Bi3+-activated vanadate GdVO4. J RARE EARTH 2016. [DOI: 10.1016/s1002-0721(16)60103-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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32
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Liang L, Kang X, Sang Y, Liu H. One-Dimensional Ferroelectric Nanostructures: Synthesis, Properties, and Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2016; 3:1500358. [PMID: 27812477 PMCID: PMC5069456 DOI: 10.1002/advs.201500358] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 12/06/2015] [Indexed: 05/22/2023]
Abstract
One-dimensional (1D) ferroelectric nanostructures, such as nanowires, nanorods, nanotubes, nanobelts, and nanofibers, have been studied with increasing intensity in recent years. Because of their excellent ferroelectric, ferroelastic, pyroelectric, piezoelectric, inverse piezoelectric, ferroelectric-photovoltaic (FE-PV), and other unique physical properties, 1D ferroelectric nanostructures have been widely used in energy-harvesting devices, nonvolatile random access memory applications, nanoelectromechanical systems, advanced sensors, FE-PV devices, and photocatalysis mechanisms. This review summarizes the current state of 1D ferroelectric nanostructures and provides an overview of the synthesis methods, properties, and practical applications of 1D nanostructures. Finally, the prospects for future investigations are outlined.
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Affiliation(s)
- Longyue Liang
- State Key Laboratory of Crystal Materials Shandong University 27 Shandanan Road Jinan 250100 P.R. China
| | - Xueliang Kang
- State Key Laboratory of Crystal Materials Shandong University 27 Shandanan Road Jinan 250100 P.R. China
| | - Yuanhua Sang
- State Key Laboratory of Crystal Materials Shandong University 27 Shandanan Road Jinan 250100 P.R. China
| | - Hong Liu
- State Key Laboratory of Crystal Materials Shandong University 27 Shandanan Road Jinan 250100 P.R. China
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33
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Mani BK, Herchig R, Glazkova E, Lisenkov S, Ponomareva I. Emergence of ferroelectricity in antiferroelectric nanostructures. NANOTECHNOLOGY 2016; 27:195705. [PMID: 27039877 DOI: 10.1088/0957-4484/27/19/195705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
First-principles-based finite-temperature simulations are used to predict the emergence of ferroelectricity in antiferroelectric nanostructures made of PbZrO3. The phenomenon is expected to occur in antiferroelectric nanodots, nanowires, and thin films with good surface charge compensation and can be explained by the recently proposed surface effect. Our computations provide a microscopic insight into the equilibrium phases, phase competition, and electrical properties of PbZrO3 nanostructures. The dependence of these properties on the electrical boundary conditions and nanostructure size is investigated.
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Affiliation(s)
- B K Mani
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
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34
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35
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Wang L, Li X, Li Z, Chu W, Li R, Lin K, Qian H, Wang Y, Wu C, Li J, Tu D, Zhang Q, Song L, Jiang J, Chen X, Luo Y, Xie Y, Xiong Y. A New Cubic Phase for a NaYF4 Host Matrix Offering High Upconversion Luminescence Efficiency. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:5528-5533. [PMID: 26288065 DOI: 10.1002/adma.201502748] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/16/2015] [Indexed: 06/04/2023]
Abstract
A NaYF4 host matrix with a new cubic phase is fabricated to offer high upconversion luminescence efficiency. The new cubic phase is formed through a hexagonal-to-cubic phase transition by shining intense near-infrared light on lanthanide-doped hexagonal NaYF4 materials.
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Affiliation(s)
- Limin Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Xiyu Li
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Zhengquan Li
- Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang, 321004, P. R. China
| | - Wangsheng Chu
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Renfu Li
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Ke Lin
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Haisheng Qian
- School of Medical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China
| | - Yao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Changfeng Wu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin, 130012, P. R. China
| | - Jiong Li
- Shanghai Synchrotron Radiation Facility, Shanghai, 201204, P. R. China
| | - Datao Tu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Qun Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Li Song
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Jun Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Xueyuan Chen
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Yi Luo
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Yi Xie
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Yujie Xiong
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
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36
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Grzyb T, Mrówczyńska L, Szczeszak A, Śniadecki Z, Runowski M, Idzikowski B, Lis S. Synthesis, characterization, and cytotoxicity in human erythrocytes of multifunctional, magnetic, and luminescent nanocrystalline rare earth fluorides. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2015; 17:399. [PMID: 26457061 PMCID: PMC4594090 DOI: 10.1007/s11051-015-3191-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 09/21/2015] [Indexed: 05/31/2023]
Abstract
Multifunctional nanoparticles exhibiting red or green luminescence properties and magnetism were synthesized and thoroughly analyzed. The hydrothermal method was used for the synthesis of Eu3+- or Tb3+-doped GdF3-, NaGdF4-, and BaGdF5-based nanocrystalline materials. The X-ray diffraction patterns of the samples confirmed the desired compositions of the materials. Transmission electron microscope images revealed the different morphologies of the products, including the nanocrystal sizes, which varied from 12 nm in the case of BaGdF5-based nanoparticles to larger structures with dimensions exceeding 300 nm. All of the samples presented luminescence under ultraviolet irradiation, as well as when the samples were in the form of water colloids. The highest luminescence was observed for BaGdF5-based materials. The obtained nanoparticles exhibited paramagnetism along with probable evidence of superparamagnetic behavior at low temperatures. The particles' magnetic characteristics were also preserved for samples in the form of a suspension in distilled water. The cytotoxicity studies against the human erythrocytes indicated that the synthesized nanoparticles are non-toxic because they did not cause the red blood cells shape changes nor did they alter their membrane structure and permeabilization.
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Affiliation(s)
- Tomasz Grzyb
- />Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Lucyna Mrówczyńska
- />Department of Cell Biology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznan, Poland
| | - Agata Szczeszak
- />Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Zbigniew Śniadecki
- />Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznan, Poland
| | - Marcin Runowski
- />Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Bogdan Idzikowski
- />Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznan, Poland
| | - Stefan Lis
- />Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
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37
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Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-015-0713-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Zamiri R, Abbastabar Ahangar H, Kaushal A, Zakaria A, Zamiri G, Tobaldi D, Ferreira JMF. Dielectrical Properties of CeO2 Nanoparticles at Different Temperatures. PLoS One 2015; 10:e0122989. [PMID: 25910071 PMCID: PMC4409379 DOI: 10.1371/journal.pone.0122989] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/26/2015] [Indexed: 11/19/2022] Open
Abstract
A template-free precipitation method was used as a simple and low cost method for preparation of CeO2 nanoparticles. The structure and morphology of the prepared nanoparticle samples were studied in detail using X-ray diffraction, Raman spectroscopy and Scanning Electron Microscopy (SEM) measurements. The whole powder pattern modelling (WPPM) method was applied on XRD data to accurately measure the crystalline domain size and their size distribution. The average crystalline domain diameter was found to be 5.2 nm, with a very narrow size distribution. UV-visible absorbance spectrum was used to calculate the optical energy band gap of the prepared CeO2 nanoparticles. The FT-IR spectrum of prepared CeO2 nanoparticles showed absorption bands at 400 cm-1 to 450 cm-1 regime, which correspond to CeO2 stretching vibration. The dielectric constant (εr) and dielectric loss (tan δ) values of sintered CeO2 compact consolidated from prepared nanoparticles were measured at different temperatures in the range from 298 K (room temperature) to 623 K, and at different frequencies from 1 kHz to 1 MHz.
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Affiliation(s)
- Reza Zamiri
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
- Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal
- * E-mail: (RZ); (AZ)
| | - Hossein Abbastabar Ahangar
- Department of Chemistry, Faculty of Science, Islamic Azad University, Najafabad Branch, Najafabad, Isfahan, Iran
| | - Ajay Kaushal
- Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal
| | - Azmi Zakaria
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
- * E-mail: (RZ); (AZ)
| | - Golnoosh Zamiri
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - David Tobaldi
- Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal
| | - J. M. F. Ferreira
- Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal
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39
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Andersen HL, Christensen M. In situ powder X-ray diffraction study of magnetic CoFe2O4 nanocrystallite synthesis. NANOSCALE 2015; 7:3481-3490. [PMID: 25626732 DOI: 10.1039/c4nr06937d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The evolution of size and size distribution during hydrothermal synthesis of nanocrystalline CoFe2O4 has been studied by in situ synchrotron powder X-ray diffraction (PXRD). Varying synthesis temperature or [OH(-)] concentration in the precursor proves to have no significant effect on the final volume-weighted nanocrystallite sizes (∼12 nm) of CoFe2O4. However, analysis by whole powder pattern modeling of the [OH(-)] concentration series reveals a substantial difference in the number-weighted size distributions when varying the amount of base used. Furthermore, changing the metal ion concentration prior to NaOH addition in the precursor preparation gives a handle to control the nanoparticle sizes (∼5-15 nm). All in situ experiments show almost instantaneous formation of the CoFe2O4 nanocrystallites, without significant growth or broadening of the size distribution after 60 s. Magnetic hysteresis curve measurements illustrate, how this facilitates the tailoring of materials with specific magnetic properties, as larger particles (∼15 nm) exhibit hard magnetic properties while the smaller particles (∼6-7 nm) are superparamagnetic.
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Affiliation(s)
- Henrik L Andersen
- Center for Materials Crystallography, Department of Chemistry and iNANO, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
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40
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Vidya YS, Anantharaju KS, Nagabhushana H, Sharma SC, Nagaswarupa HP, Prashantha SC, Shivakumara C. Combustion synthesized tetragonal ZrO2: Eu(3+) nanophosphors: structural and photoluminescence studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 135:241-251. [PMID: 25068837 DOI: 10.1016/j.saa.2014.06.151] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 06/15/2014] [Accepted: 06/29/2014] [Indexed: 06/03/2023]
Abstract
Novel crystalline tetragonal ZrO2: Eu(3+) phosphors were prepared by a facile and efficient low temperature solution combustion method at 400±10 °C using oxalyl dihydrazide (ODH) as fuel. The powder X-ray diffraction patterns and Rietveld confinement of as formed ZrO2: Eu(3+) (1-11 mol%) confirmed the presence of body centered tetragonal phase. The crystallite size estimated from Scherrer's and W-H plots was found to be in the range of 7-17 nm. These results were in good agreement with transmission electron microscopy studies. The calculated microstrain in most of the planes indicated the presence of tensile stress along various planes of the particles. The observed space group (P42/nmc) revealed the presence of cations in the 2b positions (0.75, 0.25, 0.25) and the anions in the 4d positions (0.25, 0.25, 0.45). The optical band gap energies estimated from Wood and Tauc's relation was found to be in the range 4.3-4.7 eV. Photoluminescence (PL) emission was recorded under 394 and 464 nm excitation shows an intense emission peak at 605 nm along with other emission peaks at 537, 592, 605 and 713 nm. These emission peaks were attributed to the transition of (5)D0→(7)FJ (J=0, 1, 2, 3) of Eu(3+) ions. The high ratio of Intensity of ((5)D0→(7)F2) and ((5)D0→(7)F1) infers that Eu(3+) occupies sites with a low symmetry and without an inversion center. CIE color coordinates indicated the red regions which could meet the needs of illumination devices.
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Affiliation(s)
- Y S Vidya
- Department of Physics, Lal Bahadur Shastry Government First Grade College, Bangalore 560 032, India.
| | - K S Anantharaju
- Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
| | - H Nagabhushana
- Prof. C.N.R. Rao Centre for Advanced Materials Research, Tumkur University, Tumkur 572 103, India
| | - S C Sharma
- Vice Chancellor, Chhattisgarh Swami Vivekananda Technical University, North Park Avenue, Sector-8, Bhilai, Chhattisgarh 490 009, India
| | - H P Nagaswarupa
- Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India
| | - S C Prashantha
- Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India
| | - C Shivakumara
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
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41
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Tobaldi DM, Pullar RC, Gualtieri AF, Belen Jorge A, Binions R, McMillan PF, Seabra MP, Labrincha JA. Influence of sol counter-ions on the anatase-to-rutile phase transformation and microstructure of nanocrystalline TiO2. CrystEngComm 2015. [DOI: 10.1039/c4ce02494j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Amongst nanomaterials, metal oxides play an increasingly dominant role, with titanium dioxide (titania, TiO2) being widely used for various applications, such as light-to-energy conversion and storage, and photocatalysis.
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Affiliation(s)
- D. M. Tobaldi
- Department of Materials and Ceramic Engineering/CICECO
- University of Aveiro
- 3810-193 Aveiro, Portugal
| | - R. C. Pullar
- Department of Materials and Ceramic Engineering/CICECO
- University of Aveiro
- 3810-193 Aveiro, Portugal
| | - A. F. Gualtieri
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli studi di Modena e Reggio Emilia
- I-41121 Modena, Italy
| | - A. Belen Jorge
- Department of Chemistry
- University College London
- London, UK
| | - R. Binions
- School of Engineering and Materials Science
- Queen Mary University of London
- London E1 4NS, UK
| | - P. F. McMillan
- Department of Chemistry
- University College London
- London, UK
| | - M. P. Seabra
- Department of Materials and Ceramic Engineering/CICECO
- University of Aveiro
- 3810-193 Aveiro, Portugal
| | - J. A. Labrincha
- Department of Materials and Ceramic Engineering/CICECO
- University of Aveiro
- 3810-193 Aveiro, Portugal
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42
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Kar A, Kundu S, Patra A. Lanthanide-Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding. Chemphyschem 2014; 16:505-21. [DOI: 10.1002/cphc.201402668] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Indexed: 11/08/2022]
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43
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Beekman M, Disch S, Gunning N, Johnson DC. Preparation, Formation, and Structure of [(SnSe)1.04]m(MoSe2)n Intergrowth Compounds (0 < m and n < 32) from Designed Precursors. Inorg Chem 2014; 54:1091-9. [DOI: 10.1021/ic502427c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matt Beekman
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
- Department of Natural Sciences, Oregon Institute of Technology, Klamath Falls, Oregon 97601, United States
| | - Sabrina Disch
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
- Department
of Chemistry, Universität zu Köln, D-50939 Köln, Germany
| | - Noel Gunning
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - David C. Johnson
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
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44
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Gao D, Zhang X, Zhang J. The effects of structural characterization on the luminescence of Eu3+-doped fluoride nano/microcrystals. CrystEngComm 2014. [DOI: 10.1039/c4ce01726a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Chakraborty I, Shirodkar SN, Gohil S, Waghmare UV, Ayyub P. The nature of the structural phase transition from the hexagonal (4H) phase to the cubic (3C) phase of silver. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:115405. [PMID: 24589655 DOI: 10.1088/0953-8984/26/11/115405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The phase transition from the hexagonal 4H polytype of silver to the commonly known 3C (fcc) phase was studied in detail using x-ray diffraction, electron microscopy, differential scanning calorimetry and Raman spectroscopy. The phase transition is irreversible and accompanied by extensive microstructural changes and grain growth. Detailed scanning and isothermal calorimetric analysis suggests that it is an autocatalytic transformation. Though the calorimetric data suggest an exothermic first-order phase transition with an onset at 155.6 °C (for a heating rate of 2 K min(-1)) and a latent heat of 312.9 J g(-1), the microstructure and the electrical resistance appear to change gradually from much lower temperatures. The 4H phase shows a Raman active mode at 64.3 cm(-1) (at 4 K) that undergoes mode softening as the 4H → 3C transformation temperature is approached. A first-principles density functional theory calculation shows that the stacking fault energy of 4H-Ag increases monotonically with temperature. That 4H-Ag has a higher density of stacking faults than 3C-Ag, implies the metastability of the former at higher temperatures. Energetically, the 4H phase is intermediate between the hexagonal 2H phase and the 3C ground state, as indicated by the spontaneous transformation of the 2H to the 4H phase at -4 °C. Our data appear to indicate that the 4H-Ag phase is stabilized at reduced dimensions and thermally induced grain growth is probably responsible for triggering the irreversible transformation to cubic Ag.
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Affiliation(s)
- Indrani Chakraborty
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India
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46
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Wiglusz RJ, Watras A, Malecka M, Deren PJ, Pazik R. Structure Evolution and Up‐Conversion Studies of ZnX
2
O
4
:Er
3+
/Yb
3+
(X = Al
3+
, Ga
3+
, In
3+
) Nanoparticles. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301351] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- R. J. Wiglusz
- Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50‐422 Wrocław, Poland, http://www.intibs.pl
| | - A. Watras
- Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50‐422 Wrocław, Poland, http://www.intibs.pl
| | - M. Malecka
- Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50‐422 Wrocław, Poland, http://www.intibs.pl
| | - P. J. Deren
- Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50‐422 Wrocław, Poland, http://www.intibs.pl
| | - R. Pazik
- Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50‐422 Wrocław, Poland, http://www.intibs.pl
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47
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Ghosh B, Siruguri V, Raychaudhuri AK, Chatterji T. Effect of size reduction on the structural and magnetic order in LaMnO(3+δ) (δ ≈ 0:03) nanocrystals: a neutron diffraction study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:025603. [PMID: 24334437 DOI: 10.1088/0953-8984/26/2/025603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a structural transition from the orthorhombic to the rhombohedral phase upon size reduction in nanocrystalline LaMnO(3+δ) (δ ≈ 0:03) as revealed through neutron diffraction studies. The transition occurs when the average particle (crystallite) size is taken below ~50 nm without change of δ, which is fixed at around 0.03 as measured by a number of characterization tools. The change in the crystallographic structure is accompanied by a change in the magnetic order, where the canted antiferromagnetic order with moments in the basal (ab) plane for the bulk changes to collinear ferromagnetic order with spins along the c-axis for the nanocrystals. The spontaneous ferromagnetic moment ~3 μ(B) and the transition temperature of 260 K in LaMnO(3+δ) nanocrystals are similar to those found in La0:67Ca0:33MnO3 which has a much higher Mn(4+) content. The likely origin is traced to change in magnetic exchange interactions due to change in Mn-O bond lengths which become almost identical in the MnO6 octahedron in the rhombohedral structure in the absence of Jahn-Teller distortion. The study provides an example of structural and magnetic phase transition driven purely by size reduction and with no change in the chemical constituents.
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Wiglusz RJ, Boulon G, Guyot Y, Guzik M, Hreniak D, Strek W. Structural and spectroscopic properties of Yb3+-doped MgAl2O4 nanocrystalline spinel. Dalton Trans 2014; 43:7752-9. [DOI: 10.1039/c3dt53644k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pechini's sol–gel method was successfully applied to obtain an Yb3+-doped MgAl2O4 spinel nanopowder. The regularity between the observed structural and spectroscopic measurements was described in detail.
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Affiliation(s)
- Rafal J. Wiglusz
- Institute of Low Temperature and Structure Research
- PAS
- PL-50-422 Wrocław, Poland
| | - Georges Boulon
- Institute Light Matter (ILM)
- UMR 5306 University of Lyon 1-CNRS
- University of Lyon
- Villeurbanne, France
| | - Yannick Guyot
- Institute Light Matter (ILM)
- UMR 5306 University of Lyon 1-CNRS
- University of Lyon
- Villeurbanne, France
| | - Malgorzata Guzik
- Faculty of Chemistry
- University of Wrocław
- PL-50-383 Wrocław, Poland
| | - Dariusz Hreniak
- Institute of Low Temperature and Structure Research
- PAS
- PL-50-422 Wrocław, Poland
| | - Wieslaw Strek
- Institute of Low Temperature and Structure Research
- PAS
- PL-50-422 Wrocław, Poland
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Gaur UK, Kumar A, Varma GD. The synthesis of self-assembled polycrystalline 1-D CuO nanostructures in aqueous medium and a study of their multifunctional features. CrystEngComm 2014. [DOI: 10.1039/c3ce42552e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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