1
|
Yamada T, Aharen T, Kanemitsu Y. Upconverted excitonic photoluminescence from a two-dimensional lead-halide perovskite. J Chem Phys 2019; 151:234709. [DOI: 10.1063/1.5129779] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- Takumi Yamada
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Tomoko Aharen
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| |
Collapse
|
2
|
Handa T, Tahara H, Aharen T, Kanemitsu Y. Large negative thermo-optic coefficients of a lead halide perovskite. Sci Adv 2019; 5:eaax0786. [PMID: 31334354 PMCID: PMC6641940 DOI: 10.1126/sciadv.aax0786] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 06/17/2019] [Indexed: 05/23/2023]
Abstract
Lead halide perovskites are promising semiconductors for high-performance photonic devices. Because the refractive index determines the optimal design and performance limit of the semiconductor devices, the refractive index and its change upon external modulations are the most critical properties for advanced photonic applications. Here, we report that the refractive index of halide perovskite CH3NH3PbCl3 shows a distinct decrease with increasing temperature, i.e., a large negative thermo-optic coefficient, which is opposite to those of conventional inorganic semiconductors. By using this negative coefficient, we demonstrate the compensation of thermally induced optical phase shifts occurring in conventional semiconductors. Furthermore, we observe a large and slow refractive index change in CH3NH3PbCl3 during photoirradiation and clarify its origin to be a very low thermal conductivity supported by theoretical analysis. The giant thermo-optic response of CH3NH3PbCl3 facilitates efficient phase modulation of visible light.
Collapse
|
3
|
Nagai M, Tomioka T, Ashida M, Hoyano M, Akashi R, Yamada Y, Aharen T, Kanemitsu Y. Longitudinal Optical Phonons Modified by Organic Molecular Cation Motions in Organic-Inorganic Hybrid Perovskites. Phys Rev Lett 2018; 121:145506. [PMID: 30339458 DOI: 10.1103/physrevlett.121.145506] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 08/03/2018] [Indexed: 06/08/2023]
Abstract
We performed terahertz time-domain spectroscopy for methylammonium (MA) lead halide perovskite single crystals and characterized the longitudinal optical (LO) phonons directly. We found that the effective LO phonon wave number does not change in the wide temperature range between 10 and 300 K. However, the coupling between MA cation modes and the LO phonon mode derived from lead halide cages induces a mode splitting at low temperatures and a damping of the LO phonon mode at high temperatures. These results influence the interpretation of electron-LO phonon interactions in perovskite semiconductors, as well as the interpretations of mobility, carrier diffusion, and polaron formation.
Collapse
Affiliation(s)
- Masaya Nagai
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Takuya Tomioka
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Masaaki Ashida
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Mizuki Hoyano
- Department of Physics, Chiba University, Inage-ku, Chiba 263-8522, Japan
| | - Ryo Akashi
- Department of Physics, Chiba University, Inage-ku, Chiba 263-8522, Japan
| | - Yasuhiro Yamada
- Department of Physics, Chiba University, Inage-ku, Chiba 263-8522, Japan
| | - Tomoko Aharen
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| |
Collapse
|
4
|
Yamada T, Aharen T, Kanemitsu Y. Near-Band-Edge Optical Responses of CH_{3}NH_{3}PbCl_{3} Single Crystals: Photon Recycling of Excitonic Luminescence. Phys Rev Lett 2018; 120:057404. [PMID: 29481171 DOI: 10.1103/physrevlett.120.057404] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Indexed: 06/08/2023]
Abstract
The determination of the band gap and exciton energies of lead halide perovskites is very important from the viewpoint of fundamental physics and photonic device applications. By using photoluminescence excitation (PLE) spectra, we reveal the optical properties of CH_{3}NH_{3}PbCl_{3} single crystals in the near-band-edge energy regime. The one-photon PLE spectrum exhibits the 1s exciton peak at 3.11 eV. On the contrary, the two-photon PLE spectrum exhibits no peak structure. This indicates photon recycling of excitonic luminescence. By analyzing the spatial distribution of the excitons and photon recycling, we obtain 3.15 eV for the band gap energy and 41 meV for the exciton binding energy.
Collapse
Affiliation(s)
- Takumi Yamada
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Tomoko Aharen
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| |
Collapse
|
5
|
Futagoishi T, Aharen T, Kato T, Kato A, Ihara T, Tada T, Murata M, Wakamiya A, Kageyama H, Kanemitsu Y, Murata Y. A Stable, Soluble, and Crystalline Supramolecular System with a Triplet Ground State. Angew Chem Int Ed Engl 2017; 56:4261-4265. [DOI: 10.1002/anie.201701212] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Tsukasa Futagoishi
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tomoko Aharen
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tatsuhisa Kato
- Graduate School of Human and Environmental Sciences; Kyoto University; Kyoto 606-8501 Japan
- Institute for Liberal Arts and Sciences; Kyoto University; Kyoto 606-8501 Japan
| | - Azusa Kato
- Graduate School of Human and Environmental Sciences; Kyoto University; Kyoto 606-8501 Japan
| | - Toshiyuki Ihara
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tomofumi Tada
- Materials Research Center for Element Strategy; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Michihisa Murata
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Atsushi Wakamiya
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | | | - Yasujiro Murata
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| |
Collapse
|
6
|
Futagoishi T, Aharen T, Kato T, Kato A, Ihara T, Tada T, Murata M, Wakamiya A, Kageyama H, Kanemitsu Y, Murata Y. A Stable, Soluble, and Crystalline Supramolecular System with a Triplet Ground State. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701212] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tsukasa Futagoishi
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tomoko Aharen
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tatsuhisa Kato
- Graduate School of Human and Environmental Sciences; Kyoto University; Kyoto 606-8501 Japan
- Institute for Liberal Arts and Sciences; Kyoto University; Kyoto 606-8501 Japan
| | - Azusa Kato
- Graduate School of Human and Environmental Sciences; Kyoto University; Kyoto 606-8501 Japan
| | - Toshiyuki Ihara
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Tomofumi Tada
- Materials Research Center for Element Strategy; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Michihisa Murata
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Atsushi Wakamiya
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | | | - Yasujiro Murata
- Institute for Chemical Research; Kyoto University; Uji Kyoto 611-0011 Japan
| |
Collapse
|
7
|
Gustin L, Hosaka Y, Tassel C, Aharen T, Shimakawa Y, Kageyama H, Wiley JB. From Tetrahedral to Octahedral Iron Coordination: Layer Compression in Topochemically Prepared FeLa 2Ti 3O 10. Inorg Chem 2016; 55:11529-11537. [PMID: 27783495 DOI: 10.1021/acs.inorgchem.6b02071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis, characterization, and thermal modification of the new layered perovskite FeLa2Ti3O10 have been studied. FeLa2Ti3O10 was prepared by ion exchange of the triple-layered Ruddlesden-Popper phase Li2La2Ti3O10 with FeCl2 at 350 °C under static vacuum. Rietveld refinement on synchrotron X-ray diffraction data indicates that the new phase is isostructural with CoLa2Ti3O10, where FeII cations occupy slightly compressed/flattened interlayer tetrahedral sites. Magnetic measurements on FeLa2Ti3O10 display Curie-Weiss behavior at high temperatures and a spin-glass transition at lower temperatures (<30 K). Thermal treatment in oxygen shows that FeLa2Ti3O10 undergoes a significant cell contraction (Δc ≈ -2.7 Å) with a change in the oxidation state of iron (Fe2+ to Fe3+); structural analysis and Mössbauer studies indicate that upon oxidation the local iron environment goes from tetrahedral to octahedral coordination with some deintercalation of iron as Fe2O3 to produce Fe0.67La2Ti3O10.
Collapse
Affiliation(s)
- Léa Gustin
- Department of Chemistry and Advanced Materials Research Institute, University of New Orleans , New Orleans, Louisiana 70148, United States
| | - Yoshiteru Hosaka
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomoko Aharen
- Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yuichi Shimakawa
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - John B Wiley
- Department of Chemistry and Advanced Materials Research Institute, University of New Orleans , New Orleans, Louisiana 70148, United States
| |
Collapse
|
8
|
Handa T, Tex DM, Shimazaki A, Aharen T, Wakamiya A, Kanemitsu Y. Optical characterization of voltage-accelerated degradation in CH 3NH 3PbI 3 perovskite solar cells. Opt Express 2016; 24:A917-A924. [PMID: 27409964 DOI: 10.1364/oe.24.00a917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We investigate the performance degradation mechanism of CH3NH3PbI3 perovskite solar cells under bias voltage in air and nitrogen atmospheres using photoluminescence and electroluminescence techniques. When applying forward bias, the power conversion efficiency of the solar cells decreased significantly in air, but showed no degradation in nitrogen atmosphere. Time-resolved photoluminescence measurements on these devices revealed that the application of forward bias in air accelerates the generation of non-radiative recombination centers in the perovskite layer buried in the device. We found a negative correlation between the electroluminescence intensity and the injected current intensity in air. The irreversible change of the perovskite grain surface in air initiates the degradation of the perovskite solar cells.
Collapse
|
9
|
Zhang R, Murata M, Aharen T, Wakamiya A, Shimoaka T, Hasegawa T, Murata Y. Synthesis of a distinct water dimer inside fullerene C70. Nat Chem 2016; 8:435-41. [DOI: 10.1038/nchem.2464] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 01/20/2016] [Indexed: 11/09/2022]
|
10
|
Mikita R, Aharen T, Yamamoto T, Takeiri F, Ya T, Yoshimune W, Fujita K, Yoshida S, Tanaka K, Batuk D, Abakumov AM, Brown CM, Kobayashi Y, Kageyama H. Topochemical Nitridation with Anion Vacancy-Assisted N3–/O2– Exchange. J Am Chem Soc 2016; 138:3211-7. [DOI: 10.1021/jacs.6b00088] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Dmitry Batuk
- Electron
Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Artem M. Abakumov
- Electron
Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
- Skoltech
Center for Electrochemical Energy Storage, Skolkovo Institute of Science and Technology, 143026 Moscow, Russia
| | - Craig M. Brown
- Center
for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | | | | |
Collapse
|
11
|
Thompson CM, Carlo JP, Flacau R, Aharen T, Leahy IA, Pollichemi JR, Munsie TJS, Medina T, Luke GM, Munevar J, Cheung S, Goko T, Uemura YJ, Greedan JE. Long-range magnetic order in the 5d(2) double perovskite Ba2CaOsO6: comparison with spin-disordered Ba2YReO6. J Phys Condens Matter 2014; 26:306003. [PMID: 25001885 DOI: 10.1088/0953-8984/26/30/306003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The B-site ordered double perovskite Ba2CaOsO6 was studied by dc magnetic susceptibility, powder neutron diffraction and muon spin relaxation methods. The lattice parameter is a = 8.3619(6) Å at 280 K and cubic symmetry [Formula: see text] is retained to 3.5 K with a = 8.3462(7) Å. Curie-Weiss susceptibility behaviour is observed for T > 100 K and the derived constants are C = 0.3361(3) emu K mol(-1) and ΘCW = -156.2(3) K, in excellent agreement with literature values. This Curie constant is much smaller than the spin-only value of 1.00 emu K mol(-1) for a 5d(2) Os(6+) configuration, indicating a major influence of spin-orbit coupling. Previous studies had detected both susceptibility and heat capacity anomalies near 50 K but no definitive conclusion was drawn concerning the nature of the ground state. While no ordered Os moment could be detected by powder neutron diffraction, muon spin relaxation (µSR) data show clear long-lived oscillations indicative of a continuous transition to long-range magnetic order below TC = 50 K. An estimate of the ordered moment on Os(6+) is ∼ 0.2 μB, based upon a comparison with µSR data for Ba2YRuO6 with a known ordered moment of 2.2 μB. These results are compared with those for isostructural Ba2YReO6 which contains Re(5+), also 5d(2), and has a nearly identical unit cell constant, a = 8.36278(2) Å-a structural doppelgänger. In contrast, Ba2YReO6 shows ΘCW = - 616 K, and a complex spin-disordered and, ultimately, spin-frozen ground state below 50 K, indicating a much higher level of geometric frustration than in Ba2CaOsO6. The results on these 5d(2) systems are compared to recent theory, which predicts a variety of ferromagnetic and antiferromagnetic ground states. In the case of Ba2CaOsO6, our data indicate that a complex four-sublattice magnetic structure is likely. This is in contrast to the spin-disordered ground state in Ba2YReO6, despite a lack of evidence for structural disorder, for which theory currently provides no clear explanation.
Collapse
Affiliation(s)
- C M Thompson
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada. Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON L8S 4M1, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Holmberg RJ, Kay M, Korobkov I, Kadantsev E, Boyd PG, Aharen T, Desgreniers S, Woo TK, Murugesu M. An unprecedented CoIIcuboctahedron as the secondary building unit in a Co-based metal–organic framework. Chem Commun (Camb) 2014; 50:5333-5. [DOI: 10.1039/c3cc46396f] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
13
|
Aharen T, Habib F, Korobkov I, Burchell TJ, Guillet-Nicolas R, Kleitz F, Kleiz F, Murugesu M. Novel Co-based metal-organic frameworks and their magnetic properties using asymmetrically binding 4-(4'-carboxyphenyl)-1,2,4-triazole. Dalton Trans 2013; 42:7795-802. [PMID: 23552301 DOI: 10.1039/c3dt33000a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Two novel Co-based metal-organic frameworks (MOFs) were synthesised and characterised using an asymmetrically binding ligand, 4-(4'-carboxyphenyl)-1,2,4 triazole (Hcpt). The isolated [Co3(II)(μ3-O)(OH)(cpt)3(H2O)2]n·xH2O·yDMF, Co-MOF1, exhibits a rhombohedral crystal structure (space group, P63/mc), with a trinuclear cobalt core that resembles the MIL88 series. This MOF shows paramagnetic behaviour down to 2 K with no saturation of magnetisation up to 7 T. This is presumably due to a geometrically frustrated triangular arrangement of Co spins. The two-dimensional complex, [Co(II)(cpt)(N3)]n, Co-MOF2, crystallises in a monoclinic crystal system (space group, C2/m). The magnetic measurements reveal metamagnetic behaviour for this complex with a critical field in the range of 700-1000 Oe.
Collapse
Affiliation(s)
- Tomoko Aharen
- Department of Chemistry, University of Ottawa, 10 Marie Curie Private, Ottawa, ON, Canada K1N 6N5
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Cook C, Habib F, Aharen T, Clérac R, Hu A, Murugesu M. High-temperature spin crossover behavior in a nitrogen-rich Fe(III)-based system. Inorg Chem 2013; 52:1825-31. [PMID: 23387958 DOI: 10.1021/ic301864d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nitrogen-rich ligand bis(1H-tetrazol-5-yl)amine (H(3)bta) was employed to isolate a new Fe(III) complex, Na(2)NH(4)[Fe(III)(Hbta)(3)]·3DMF·2H(2)O (1). Single crystal X-ray diffraction revealed that complex 1 consists of Fe(III) ions in an octahedral environment where each metal ion is coordinated by three Hbta(2-) ligands forming the [Fe(III)(Hbta)(3)](3-) core. Each unit is linked to two one-dimensional (1-D) Na(+)/solvent chains creating a two-dimensional (2-D) network. In addition, the presence of multiple hydrogen bonds in all directions between ammonium cation and ligands of different [Fe(III)(Hbta)(3)](3-) units generates a three-dimensional (3-D) network. Magnetic measurements confirmed that the Fe(III) center undergoes a Spin Crossover (SCO) at high temperature (T(1/2) = 460(10) K).
Collapse
Affiliation(s)
- Cyril Cook
- Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | | | | | | | | | | |
Collapse
|
15
|
Holmberg RJ, Aharen T, Murugesu M. Paramagnetic Nanocrystals: Remarkable Lanthanide-Doped Nanoparticles with Varied Shape, Size, and Composition. J Phys Chem Lett 2012; 3:3721-3733. [PMID: 26291102 DOI: 10.1021/jz301562m] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Magnetic nanoparticles have been developed in recent years with applications in unique and crucial areas such as biomedicine, data storage, environmental remediation, catalysis, and so forth. NaYF4 nanoparticles were synthesized and isolated with lanthanide dopant percentages, confirmed by ICP-OES measurements, of Er, Yb, Tb, Gd, and Dy that were in agreement with the targeted ratios. SEM images showed a distinct variation in particle size and shape with dopant type and percentage. HRTEM and XRD studies confirmed the particles to be crystalline, possessing both α and β phases. Magnetic measurements determined that all of the nanoparticles were paramagnetic and did not exhibit a blocking temperature from 2 to 300 K. The multifunctional properties of these nanoparticles make them suitable for many applications, such as multimodal imaging probes, up-conversion fluorescent markers, as well as MRI contrast agents.
Collapse
Affiliation(s)
- Rebecca J Holmberg
- Centre for Catalysis Research and Innovation and Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5
| | - Tomoko Aharen
- Centre for Catalysis Research and Innovation and Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5
| | - Muralee Murugesu
- Centre for Catalysis Research and Innovation and Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5
| |
Collapse
|
16
|
Yan PF, Lin PH, Habib F, Aharen T, Murugesu M, Deng ZP, Li GM, Sun WB. Planar Tetranuclear Dy(III) Single-Molecule Magnet and Its Sm(III), Gd(III), and Tb(III) Analogues Encapsulated by Salen-Type and β-Diketonate Ligands. Inorg Chem 2011; 50:7059-65. [DOI: 10.1021/ic200566y] [Citation(s) in RCA: 136] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|