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Zhang Y, Ju S, Casals G, Tang J, Lin Y, Li X, Liang L, Jia Z, Zeng M, Casals E. Facile aqueous synthesis and comparative evaluation of TiO 2-semiconductor and TiO 2-metal nanohybrid photocatalysts in antibiotics degradation under visible light. RSC Adv 2023; 13:33187-33203. [PMID: 37954413 PMCID: PMC10636657 DOI: 10.1039/d3ra06231g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 11/05/2023] [Indexed: 11/14/2023] Open
Abstract
Advanced oxidation processes using TiO2-based nanomaterials are sustainable technologies that hold great promise for the degradation of many types of pollutants including pharmaceutical residues. A wide variety of heterostructures coupling TiO2 with visible-light active nanomaterials have been explored to shift its photocatalytic properties to harness sun irradiation but a systematic comparison between them is lacking in the current literature. Furthermore, the high number of proposed nanostructures with different size, morphology, and surface area, and the often complex synthesis processes hamper the transition of these materials into commercial and effective solutions for environmental remediation. Herein, we have designed a facile and cost-effective method to synthesize two heterostructured photocatalysts representative of two main families of novel structures proposed, hybrids of TiO2 with metal (Au) and semiconductor (CeO2) nanomaterials. The photocatalysts have been extensively characterized to ensure a good comparability in terms of co-catalyst doping characteristics, morphology and surface area. The photocatalytic degradation of ciprofloxacin and sulfamethoxazole as target pollutants, two antibiotics of high concern polluting water sources, has been evaluated and CeO2/TiO2 exhibited the highest activity, achieving complete antibiotic degradation at very low photocatalyst concentrations. Our study provides new insights into the development of inexpensive heterostructured photocatalysts and suggests that the non-stoichiometry and characteristic d and f electronic orbital configuration of CeO2 have a significantly improved role in the enhancement of the photocatalytic reaction.
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Affiliation(s)
- Yuping Zhang
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Shijie Ju
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Gregori Casals
- Biochemistry and Molecular Genetics Department, Clinical and Provincial Hospital of Barcelona Barcelona 08036 Spain
- IDIBAPS Research Center Barcelona 08036 Spain
| | - Jie Tang
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Yichao Lin
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Xiaofang Li
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Lihua Liang
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Zhiyu Jia
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology Beijing 100081 PR China
| | - Muling Zeng
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
| | - Eudald Casals
- School of Biotechnology and Health Sciences, Wuyi University Jiangmen 529020 PR China
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2
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Machon D, Le Floch S, Mishra S, Daniele S, Masenelli-Varlot K, Hermet P, Mélinon P. Extreme structural stability of Ti 0.5Sn 0.5O 2 nanoparticles: synergistic effect in the cationic sublattice. NANOSCALE 2022; 14:14286-14296. [PMID: 36134596 DOI: 10.1039/d2nr03441g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Ti0.5Sn0.5O2 nanoparticles (∼5 nm and ∼10 nm) have been studied under high pressure by Raman spectroscopy. For particles with diameter ∼10 nm, a transformation has been observed at 20-25 GPa while for particles with ∼5 nm diameter no phase transition has been observed up to ∼30 GPa. The Ti0.5Sn0.5O2 solid solution shows an extended stability at the nanoscale, both of its cationic and anionic sublattices. This ultrastability originates from the contribution of Ti and Sn mixing: Sn stabilizes the cationic network at high pressure and Ti ensures a coupling between the cationic and anionic sublattices. This result questions a "traditional" crystallographic description based on polyhedra packing and this synergistic effect reported in this work is similar to the case of metamaterials but at the nanoscale.
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Affiliation(s)
- Denis Machon
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5306, Institut Lumière Matière, F-69622 Villeurbanne, France.
- Laboratoire Nanotechnologies et Nanosystèmes (LN2), CNRS UMI-3463, Université de Sherbrooke, Institut Interdisciplinaire d'Innovation Technologique(3IT), Sherbrooke, Québec, Canada
| | - Sylvie Le Floch
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5306, Institut Lumière Matière, F-69622 Villeurbanne, France.
| | - Shashank Mishra
- IRCELYON, CNRS-UMR 5256, Université Lyon 1, 2 Avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Stéphane Daniele
- IRCELYON, CNRS-UMR 5256, Université Lyon 1, 2 Avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | | | - Patrick Hermet
- ICGM, CNRS-UMR 5253, Université de Montpellier, ENSCM, 34090 Montpellier, France
| | - Patrice Mélinon
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5306, Institut Lumière Matière, F-69622 Villeurbanne, France.
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3
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Morphology Tuned Pressure Induced Amorphization in VO2(B) Nanobelts. INORGANICS 2022. [DOI: 10.3390/inorganics10080122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Pressure-induced amorphization (PIA) has drawn great attention since it was first observed in ice. This process depends closely on the crystal structure, the size, the morphology and the correlated pressurization environments, among which the morphology-tuned PIA remains an open question on the widely concerned mesoscale. In this work, we report the synthesis and high-pressure research of VO2(B) nanobelts. XRD and TEM were performed to investigate the amorphization process. The amorphization pressure in VO2(B) nanobelts(~30 GPa) is much higher than that in previous reported 2D VO2(B) nanosheets(~21 GPa), the mechanism is the disruption of connectivity at particular relatively weaker bonds in the (010) plane. These results suggest a morphology-tuned pressure-induced amorphization, which could promote the fundamental understanding of PIA.
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4
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Wang K, Molteni C, Haynes PD. Localized Soft Vibrational Modes and Coherent Structural Phase Transformations in Rutile TiO 2 Nanoparticles under Negative Pressure. NANO LETTERS 2022; 22:5922-5928. [PMID: 35797495 PMCID: PMC9335867 DOI: 10.1021/acs.nanolett.2c01939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We study the effect of size on the vibrational modes and frequencies of nanoparticles, by applying a newly developed, robust, and efficient first-principles-based method that we present in outline. We focus on rutile TiO2, a technologically important material whose bulk exhibits a softening of a transverse acoustic mode close to q=(12,12,14), which becomes unstable with the application of negative pressure. We demonstrate that, under these conditions, nanoparticles above a critical size exhibit unstable localized modes and we calculate their characteristic localization length and decomposition with respect to bulk phonons. We propose that such localized soft modes could initiate coherent structural phase transformations in small nanoparticles above a critical size.
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Affiliation(s)
- Kang Wang
- Imperial
College London, Department of Materials, Exhibition Road, London SW7 2AZ, U.K.
| | - Carla Molteni
- King’s
College London, Department of Physics, Strand, London WC2R 2LS, U.K.
| | - Peter D. Haynes
- Imperial
College London, Department of Materials, Exhibition Road, London SW7 2AZ, U.K.
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5
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Li J, Liu B, Dong J, Li C, Dong Q, Lin T, Liu R, Wang P, Shen P, Li Q, Liu B. Size and morphology effects on the high pressure behaviors of Mn 3O 4 nanorods. NANOSCALE ADVANCES 2020; 2:5841-5847. [PMID: 36133888 PMCID: PMC9419549 DOI: 10.1039/d0na00610f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 10/26/2020] [Indexed: 06/16/2023]
Abstract
The high-pressure behaviors of Mn3O4 nanorods were studied by high pressure powder synchrotron X-ray diffraction and Raman spectroscopy. We found that the initial hausmannite phase transforms into the orthorhombic CaTi2O4-type structure, and then to the marokite-like phase upon compression. Upon decompression, the marokite-like phase is retained at the ambient pressure. Compared with Mn3O4 bulk and nanoparticles, Mn3O4 nanorods show obviously different phase transition behaviors. Upon compression, the phase transition sequence of Mn3O4 nanorods is similar with the nanoparticles, while the decompression behavior is consistent with the bulk counterparts. The hausmannite phase shows higher stability and smaller bulk modulus in Mn3O4 nanorods than those of the corresponding bulk and nanoparticles. We proposed that the higher phase stability and compressibility of the nanorods are concerned with their nanosize effects and the rod morphology. Both the growth orientation and the suppressed Jahn-Teller distortion of the Mn3O4 nanorods are crucial factors for their high pressure behaviors.
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Affiliation(s)
- Juanying Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Bo Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Junyan Dong
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Chenyi Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Qing Dong
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Tao Lin
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Ran Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Peng Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Pengfei Shen
- Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology Shenzhen 518055 China
| | - Quanjun Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University No. 2699 Qianjin Street Changchun 130012 People's Republic of China
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6
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Tang S, Huang X, Zhang J, Cui Q. InOOH Bulk Crystals and Ultrathin Nanowires under Compression. ACS OMEGA 2020; 5:15146-15151. [PMID: 32637787 PMCID: PMC7331075 DOI: 10.1021/acsomega.0c01088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/04/2020] [Indexed: 06/11/2023]
Abstract
InOOH bulk crystals and ultrathin nanowires have been investigated under high pressures by in situ synchrotron radiation X-ray diffraction measurements at ambient temperature. The anisotropic compression indicates that the b-axis is more compressible than the other two axes in InOOH under hydrostatic conditions. Two inflection points, which are associated with the hydrogen-bond strengthening, can be reflected in the plots of b/c ratio versus pressure (b/c-P plots). The size-induced enhancement of the bulk modulus can be visualized from the P-V plots. By comparing the differences in the compression of bulk InOOH and ultrathin nanowires, it is validated that the nanosize effects play an important role in the high-pressure behaviors of InOOH.
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Affiliation(s)
- Shunxi Tang
- School
of Computer Science, Jiangxi University
of Traditional Chinese Medicine, Nanchang 330004, China
| | - Xuejuan Huang
- School
of Pharmacy, Jiangxi University of Traditional
Chinese Medicine, Nanchang 330004, China
| | - Jian Zhang
- College
of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Qiliang Cui
- College
of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
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7
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Mei S, Guo Y, Lin X, Dong H, Sun LD, Li K, Yan CH. Experimental and Simulation Insights into Local Structure and Luminescence Evolution in Eu 3+-Doped Nanocrystals under High Pressure. J Phys Chem Lett 2020; 11:3515-3520. [PMID: 32293899 DOI: 10.1021/acs.jpclett.0c00895] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tremendous effort has been devoted to tailoring structure-correlated properties, especially for the luminescence of lanthanide nanocrystals (NCs). High pressure has been demonstrated as a decent way to tune the performance of lanthanide NCs; however, little attention has been paid to the local structure evolution accompanied by extreme compression and its effect on luminescence. Here, we tailor the local structure around lanthanide ions with pressure in β-NaGdF4 NCs, in which Eu3+ ions were doped as optical probes for local structure for the sensitive electric dipole transition. As the pressure increases, the intensity ratio of the 5D0 → 7F2 to 5D0 → 7F1 transition decreases monotonically from 2.04 to 0.81, implying a higher local symmetry around Eu3+ ions from compression. In situ X-ray diffraction demonstrates that the sample maintains the hexagonal structure up to 33.5 GPa, and density functional theory calculations reveal the tendency of the local structure to vary under high pressure.
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Affiliation(s)
- Sheng Mei
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yu Guo
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiaohuan Lin
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Hao Dong
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ling-Dong Sun
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Kuo Li
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Chun-Hua Yan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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8
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Liu F, Dong Z, Liu L. Comparative study on the pressure-induced phase transformation of anatase TiO 2 hollow and solid microspheres. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:395403. [PMID: 31242467 DOI: 10.1088/1361-648x/ab2d17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanostructured anatase TiO2 undergoes pressure-induced phase transformation, and the transformation sequence is significantly different from the bulk counterpart. The size and the morphology are found both playing a critical role in the phase transformation behavior. In this work, we prepare anatase TiO2 microspheres using a hydrothermal method. By controlling the reaction time, hollow and solid spheres of similar diameters are prepared. TEM and XRD analysis reveals that these microspheres are aggregates of anatase nanocrystalline of size between 15-16 nm. The phase transformation behaviour under high temperature is examined in situ using both Raman spectroscopy and synchrotron x-ray diffraction. We find that although both solid and hollow spheres are micron-sized, they undergo phase transformation sequence similar to nanomaterials with size of several tens of nanometers. Hollow spheres exhibit a higher compressibility than the solid spheres. A detailed analysis based on the formation mechanism of the spheres is performed to explain the unique phase transformation behavior of these materials.
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Affiliation(s)
- Fang Liu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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9
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Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects. Proc Natl Acad Sci U S A 2019; 116:11181-11186. [PMID: 31101716 DOI: 10.1073/pnas.1902820116] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Wurtzite boron nitride (w-BN) is a metastable superhard material that is a high-pressure polymorph of BN. Clarifying how the metastable high-pressure material can be stabilized at atmospheric pressure is a challenging issue of fundamental scientific importance and promising technological value. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and high temperature. By combining transmission electron microscopy and ab initio molecular dynamics simulations, we reveal a stabilization mechanism for w-BN, i.e., the metastable high-pressure phase can be stabilized by 3D networks of planar defects which are constructed by a high density of intersecting (0001) stacking faults and {10[Formula: see text]0} inversion domain boundaries. The 3D networks of planar defects segment the w-BN bulk crystal into numerous nanometer-size prismatic domains with the reverse crystallographic polarities. Our findings unambiguously demonstrate the retarding effect of crystal defects on the phase transformations of metastable materials, which is in contrast to the common knowledge that the crystal defects in materials will facilitate the occurrence of phase transformations.
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10
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Bai F, Bian K, Huang X, Wang Z, Fan H. Pressure Induced Nanoparticle Phase Behavior, Property, and Applications. Chem Rev 2019; 119:7673-7717. [PMID: 31059242 DOI: 10.1021/acs.chemrev.9b00023] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Nanoparticle (NP) high pressure behavior has been extensively studied over the years. In this review, we summarize recent progress on the studies of pressure induced NP phase behavior, property, and applications. This review starts with a brief overview of high pressure characterization techniques, coupled with synchrotron X-ray scattering, Raman, fluorescence, and absorption. Then, we survey the pressure induced phase transition of NP atomic crystal structure including size dependent phase transition, amorphization, and threshold pressures using several typical NP material systems as examples. Next, we discuss the pressure induced phase transition of NP mesoscale structures including topics on pressure induced interparticle separation distance, NP coupling, and NP coalescence. Pressure induced new properties and applications in different NP systems are highlighted. Finally, outlooks with future directions are discussed.
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Affiliation(s)
- Feng Bai
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
| | - Kaifu Bian
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Xin Huang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Zhongwu Wang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Hongyou Fan
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.,Department of Chemical and Biological Engineering, Albuquerque, University of New Mexico, Albuquerque, New Mexico 87106, United States.,Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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11
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Guan Z, Li Q, Zhang H, Shen P, Zheng L, Chu S, Park C, Hong X, Liu R, Wang P, Liu B, Shen G. Pressure induced transformation and subsequent amorphization of monoclinic Nb 2O 5 and its effect on optical properties. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:105401. [PMID: 30566910 DOI: 10.1088/1361-648x/aaf9bd] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Pressure-induced phase transitions of monoclinic H-Nb2O5 have been studied by in situ synchrotron x-ray diffraction, pair distribution function (PDF) analysis, and Raman and optical transmission spectroscopy. The initial monoclinic phase is found to transform into an orthorhombic phase at ~9 GPa and then change to an amorphous form above 21.4 GPa. The PDF data reveal that the amorphization is associated with disruptions of the long-range order of the NbO6 octahedra and the NbO7 pentagonal bipyramids, whereas the local edge-shares of octahedra and the local linkages of pentagonal bipyramids are largely preserved in their nearest neighbors. Upon compression, the transmittance of the sample in a region from visible to near infrared (450-1000 nm) starts to increase above 8.0 GPa and displays a dramatic enhancement above 22.2 GPa, indicating that the amorphous form has a high transmittance. The pressure-induced amorphous form is found to be recoverable under pressure release, and maintain high optical transmittance property at ambient conditions. The recoverable pressure induced amorphous material promises for applications in multifunctional materials.
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Affiliation(s)
- Zhou Guan
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China
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12
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Huang Y, He Y, Sheng H, Lu X, Dong H, Samanta S, Dong H, Li X, Kim DY, Mao HK, Liu Y, Li H, Li H, Wang L. Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li 4Ti 5O 12. Natl Sci Rev 2019; 6:239-246. [PMID: 34691862 PMCID: PMC8291545 DOI: 10.1093/nsr/nwy122] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 10/09/2018] [Accepted: 10/11/2018] [Indexed: 11/13/2022] Open
Abstract
Lithium titanium oxide (Li4Ti5O12, LTO), a 'zero-strain' anode material for lithium-ion batteries, exhibits excellent cycling performance. However, its poor conductivity highly limits its applications. Here, the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations. LTO underwent a pressure-induced amorphization (PIA) at 26.9 GPa. The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase. Furthermore, our calculations demonstrated that the different compressibility of the LiO6 and TiO6 octahedra in the structure was crucial for the PIA. The amorphous phase promotes Li+ diffusion and enhances its ionic conductivity by providing defects for ion migration. Our results not only provide an insight into the pressure depended structural properties of a spinel-like material, but also facilitate exploration of the interplay between PIA and conductivity.
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Affiliation(s)
- Yanwei Huang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Yu He
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Howard Sheng
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Department of Physics and Astronomy, George Mason University, Fairfax VA 22030, USA
| | - Xia Lu
- State Key Laboratory of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Energy, Beijing University of Chemical Engineering, Beijing 100029, China
| | - Haini Dong
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Sudeshna Samanta
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Hongliang Dong
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Xifeng Li
- School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
| | - Duck Young Kim
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Ho-kwang Mao
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Geophysical Laboratory, Carnegie Institution, Washington, DC 20015, USA
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Heping Li
- Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Hong Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lin Wang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
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13
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Structural Phase Transition and Compressibility of CaF2 Nanocrystals under High Pressure. CRYSTALS 2018. [DOI: 10.3390/cryst8050199] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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14
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Xi W, Song X, Hu S, Chen Z. Phase field crystal simulation of stress induced localized solid-state amorphization in nanocrystalline materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:475902. [PMID: 28960182 DOI: 10.1088/1361-648x/aa8fee] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, the phase field crystal (PFC) method is used to study the localized solid-state amorphization (SSA) and its dynamic transformation process in polycrystalline materials under the uniaxial tensile deformation with different factors. The impacts of these factors, including strain rates, temperatures and grain sizes, are analyzed. Kinetically, the ultra-high strain rate causes the lattice to be seriously distorted and the grain to gradually collapse, so the dislocation density rises remarkably. Therefore, localized SSA occurs. Thermodynamically, as high temperature increases the activation energy, the atoms are active and prefer to leave the original position, which induce atom rearrangement. Furthermore, small grain size increases the percentage of grain boundary and the interface free energy of the system. As a result, Helmholtz free energy increases. The dislocations and Helmholtz free energy act as the seed and driving force for the process of the localized SSA. Also, the critical diffusion-time step and the percentage of amorphous region areas are calculated. Through this work, the PFC method is proved to be an effective means to study localized SSA under uniaxial tensile deformation.
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Affiliation(s)
- Wen Xi
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
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15
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Sun Q, Zheng C, Huston LQ, Frankcombe TJ, Chen H, Zhou C, Fu Z, Withers RL, Norén L, Bradby JE, Etheridge J, Liu Y. Bimetallic Ions Codoped Nanocrystals: Doping Mechanism, Defect Formation, and Associated Structural Transition. J Phys Chem Lett 2017; 8:3249-3255. [PMID: 28661671 DOI: 10.1021/acs.jpclett.7b01384] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ionic codoping offers a powerful approach for modifying material properties by extending the selection of potential dopant ions. However, it has been a major challenge to introduce certain ions that have hitherto proved difficult to use as dopants (called "difficult-dopants") into crystal structures at high concentrations, especially through wet chemical synthesis. Furthermore, the lack of a fundamental understanding of how codopants are incorporated into host materials, which types of defect structures they form in the equilibrium state, and what roles they play in material performance, has seriously hindered the rational design and development of promising codoped materials. Here we take In3+ (difficult-dopants) and Nb5+ (easy-dopants) codoped anatase TiO2 nanocrystals as an example and investigate the doping mechanism of these two different types of metal ions, the defect formation, and their associated impacts on high-pressure induced structural transition behaviors. It is experimentally demonstrated that the dual mechanisms of nucleation and diffusion doping are responsible for the synergic incorporation of these two dopants and theoretically evidenced that the defect structures created by the introduced In3+, Nb5+ codopants, their resultant Ti3+, and oxygen vacancies are locally composed of both defect clusters and equivalent defect pairs. These formed local defect structures then act as nucleation centers of baddeleyite- and α-PbO2-like metastable polymorphic phases and induce the abnormal trans-regime structural transition of codoped anatase TiO2 nanocrystals under high pressure. This work thus suggests an effective strategy to design and synthesize codoped nanocrystals with highly concentrated difficult-dopants. It also unveils the significance of local defect structures on material properties.
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Affiliation(s)
| | | | | | - Terry J Frankcombe
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales , Australian Capital Territory, Canberra 2601, Australia
| | | | - Chao Zhou
- Fenghua Advanced Technology Holding Co., Ltd. , Zhaoqing, Guangdong 526020, China
| | - Zhenxiao Fu
- Fenghua Advanced Technology Holding Co., Ltd. , Zhaoqing, Guangdong 526020, China
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16
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Zhang Y, Wang Q, Zhang J, Wu X, Ma Y. An immutable array of TiO 2 nanotubes to pressures over 30 GPa. NANOTECHNOLOGY 2017; 28:145705. [PMID: 28206983 DOI: 10.1088/1361-6528/aa60fb] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the successful formation of an immutable array of α-PbO2 phase TiO2 nanotubes by compression of a TiO2 nanotube array in an anatase phase. During compression to 31.3 GPa, the TiO2 nanotubes started to directly transform from an anatase phase to a baddeleyite phase at 14.5 GPa and completed the transition at 30.1 GPa. Under decompression, the baddeleyite phase transformed to an α-PbO2 phase at 4.6 GPa, which was quenchable to ambient pressure. Notably the tubular array microstructure was retained after the application of ultra high pressure and undergoing a series of phase transformations. Measurements indicated that the nanotubes in the array possessed higher compressibility than in the bulk form. The highly aligned array structure is believed to reinforce the nanotubes themselves, giving exceptional stability. This, as well as the wall thickness, may also account for their different phase transition pathway.
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Affiliation(s)
- Yanyan Zhang
- Center for High Pressure Science and Technology Advanced Research, Changchun, 130012, People's Republic of China
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17
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Shen G, Mao HK. High-pressure studies with x-rays using diamond anvil cells. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:016101. [PMID: 27873767 DOI: 10.1088/1361-6633/80/1/016101] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Pressure profoundly alters all states of matter. The symbiotic development of ultrahigh-pressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.
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Affiliation(s)
- Guoyin Shen
- Geophysical Laboratory, Carnegie Institution of Washington, Washington DC, USA
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18
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Lü X, Wang Y, Stoumpos CC, Hu Q, Guo X, Chen H, Yang L, Smith JS, Yang W, Zhao Y, Xu H, Kanatzidis MG, Jia Q. Enhanced Structural Stability and Photo Responsiveness of CH 3 NH 3 SnI 3 Perovskite via Pressure-Induced Amorphization and Recrystallization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8663-8668. [PMID: 27514760 DOI: 10.1002/adma.201600771] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 07/07/2016] [Indexed: 05/18/2023]
Abstract
An organic-inorganic halide CH3 NH3 SnI3 perovskite with significantly improved structural stability is obtained via pressure-induced amorphization and recrystallization. In situ high-pressure resistance measurements reveal an increased electrical conductivity by 300% in the pressure-treated perovskite. Photocurrent measurements also reveal a substantial enhancement in visible-light responsiveness. The mechanism underlying the enhanced properties is shown to be associated with the pressure-induced structural modification.
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Affiliation(s)
- Xujie Lü
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Yonggang Wang
- High Pressure Science and Engineering Center (HiPSEC), University of Nevada Las Vegas, Las Vegas, NV, 89154, USA
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | | | - Qingyang Hu
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, China
| | - Xiaofeng Guo
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Haijie Chen
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
| | - Liuxiang Yang
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Jesse S Smith
- High Pressure Collaborative Access Team (HPCAT), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Wenge Yang
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, China
| | - Yusheng Zhao
- High Pressure Science and Engineering Center (HiPSEC), University of Nevada Las Vegas, Las Vegas, NV, 89154, USA.
- Department of Physics, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Hongwu Xu
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
| | | | - Quanxi Jia
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
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19
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Liu G, Kong L, Yan J, Liu Z, Zhang H, Lei P, Xu T, Mao HK, Chen B. Nanocrystals in compression: unexpected structural phase transition and amorphization due to surface impurities. NANOSCALE 2016; 8:11803-11809. [PMID: 27280175 DOI: 10.1039/c5nr09027j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report an unprecedented surface doping-driven anomaly in the compression behaviors of nanocrystals demonstrating that the change of surface chemistry can lead to an interior bulk structure change in nanoparticles. In the synchrotron-based X-ray diffraction experiments, titania nanocrystals with low concentration yttrium dopants at the surface are found to be less compressible than undoped titania nanocrystals. More surprisingly, an unexpected TiO2(ii) phase (α-PbO2 type) is induced and obvious anisotropy is observed in the compression of yttrium-doped TiO2, in sharp contrast to the compression behavior of undoped TiO2. In addition, the undoped brookite nanocrystals remain with the same structure up to 30 GPa, whereas the yttrium-doped brookite amorphizes above 20 GPa. The abnormal structural evolution observed in yttrium-doped TiO2 does not agree with the reported phase stability of nano titania polymorphs, thus suggesting that the physical properties of the interior of nanocrystals can be controlled by the surface, providing an unconventional and new degree of freedom in search for nanocrystals with novel tunable properties that can trigger applications in multiple areas of industry and provoke more related basic science research.
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Affiliation(s)
- Gang Liu
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China. and High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institute of Washington, Argonne, Illinois 60439, USA
| | - Lingping Kong
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China. and High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institute of Washington, Argonne, Illinois 60439, USA
| | - Jinyuan Yan
- Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA and Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA
| | - Zhenxian Liu
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - Hengzhong Zhang
- Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
| | - Pei Lei
- Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China
| | - Tao Xu
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, USA
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China. and Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - Bin Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China. and Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
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20
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The behaviors of anatase and TiO2(B) phase coexisting nanosheets under high pressure. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.11.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Li Q, Zhang H, Liu R, Liu B, Li D, Zheng L, Liu J, Cui T, Liu B. Nanosize effects assisted synthesis of the high pressure metastable phase in ZrO2. NANOSCALE 2016; 8:2412-2417. [PMID: 26754580 DOI: 10.1039/c5nr07503c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The size effects on the high pressure behaviors of monoclinic (MI) ZrO2 nanoparticles were studied using in situ high pressure synchrotron X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). A size-dependent phase transition behavior under high pressure was found in nanoscale ZrO2. The normal phase transition sequence of MI-orthorhombic I (OI)-orthorhombic II (OII) occurs in 100-300 nm ZrO2 nanoparticles, while only the transition of MI-OI exists in ultrafine ∼5 nm ZrO2 nanoparticles up to the highest experimental pressure of ∼52 GPa. This indicates that the size effects preclude the transition from the OI to the OII phase in ∼5 nm nanoparticles. Upon decompression, the OII and OI phases are retained down to ambient pressure, respectively. This is the first observation of the pure OI phase ZrO2 under ambient conditions. The bulk moduli of the MI ZrO2 nanoparticles were determined to be B0 = 192 (7) GPa for the 100-300 nm nanoparticles and B0 = 218 (12) GPa for the ∼5 nm nanoparticles. We suggest that the significant high surface energy precludes the transition from the OI to the OII phase and the nanosize effects enhance the incompressibility in the ultrafine ZrO2 nanoparticles (∼5 nm). Our study indicates that this is a potential way of preparing novel nanomaterials with high pressure structures using nanosize effects.
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Affiliation(s)
- Quanjun Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Huafang Zhang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Ran Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Bo Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Dongmei Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Liu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China.
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22
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Dong Z, Xiao F, Zhao A, Liu L, Sham TK, Song Y. Pressure induced structural transformations of anatase TiO2 nanotubes probed by Raman spectroscopy and synchrotron X-ray diffraction. RSC Adv 2016. [DOI: 10.1039/c6ra15614b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pressure-induced transformations of anatase TiO2 nanotubes probed by in situ Raman spectroscopy and synchrotron X-ray diffraction reveal novel compression behaviors.
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Affiliation(s)
- Zhaohui Dong
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
- Shanghai Synchrotron Radiation Facility (SSRF)
| | - Fengping Xiao
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
- College of Chemistry and Chemical Engineering
| | - Ankang Zhao
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
| | - Lijia Liu
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
- Institute of Functional Nano and Soft Materials (FUNSOM)
| | - Tsun-Kong Sham
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
- Soochow University-Western University Centre for Synchrotron Radiation Research
| | - Yang Song
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
- Soochow University-Western University Centre for Synchrotron Radiation Research
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23
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24
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Gunawidjaja R, Diez-y-Riega H, Eilers H. Irreversible phase transitions due to laser-based T-jump heating of precursor Eu:ZrO2/Tb:Y2O3 core/shell nanoparticles. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2015.06.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Zhou B, Xiao G, Yang X, Li Q, Wang K, Wang Y. Pressure-dependent optical behaviors of colloidal CdSe nanoplatelets. NANOSCALE 2015; 7:8835-8842. [PMID: 25910180 DOI: 10.1039/c4nr07589g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two-dimensional (2D) colloidal anisotropic CdSe nanoplatelets (NPLs) have attracted a great deal of attraction within recent years. Their strong thickness-dependent absorption and emission spectra exhibit significant differences from those of other shaped CdSe nanocrystals (NCs) due to a unique atomically flat morphology. Based on their dielectric confinement effect and the large confinement energy, the 2D CdSe NPLs exhibit the best characteristics of optical and electronic properties as compared to the other CdSe nanocrystallite ensembles. Here, we systematically investigate the in situ high-pressure photoluminescence (PL), absorption, and time-resolved PL spectroscopy of CdSe NPLs with different thicknesses. The pressure-dependent optical behaviors of these NPLs exhibit several remarkable differences compared with those of other shaped CdSe NCs such as a higher phase transition pressure, irreversible PL and absorption spectra after the release of pressure, a narrower tunable range of absorption and PL peak energies, and minor changes in the ranges of PL decay time with increasing pressure. These phenomena and results are attributed to their unique geometric shape and distinctive soft ligand bonding on the surface.
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Affiliation(s)
- Bo Zhou
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, P. R. China.
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26
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Xiao S, Li X, Deng H, Deng L, Hu W. Amorphization and thermal stability of aluminum-based nanoparticles prepared from the rapid cooling of nanodroplets: effect of iron addition. Phys Chem Chem Phys 2015; 17:6511-22. [PMID: 25656373 DOI: 10.1039/c4cp05030d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Despite an intensive investigation on bimetallic nanoparticles, little attention has been paid to their amorphization in the past few decades. The study of amorphization on a nanoscale is of considerable significance for the preparation of amorphous nanoparticles and bulk metallic glass. Herein, we pursue the amorphization process of Al-based nanoparticles with classic molecular dynamics simulations and local structural analysis techniques. By a comparative study of the amorphization of pure Al and Fe-doped Al-based nanodroplets in the course of rapid cooling, we find that Fe addition plays a very important role in the vitrification of Al-based nanodroplets. Owing to the subsurface segregated Fe atoms with their nearest neighbors tending to form relatively stable icosahedral (ICO) clusters, the Fe-centred cluster network near the surface effectively suppresses the crystallization of droplets from surface nucleation and growth as the concentration of Fe attains a certain value. The glass formation ability of nanodroplets is suggested to be enhanced by the high intrinsic inner pressure as a result of small size and surface tension, combined with the dopant-inhibited surface nucleation. In addition, the effect of the size and the added concentration of nanoparticles on amorphization and the thermal stability of the amorphous nanoparticles are discussed. Our findings reveal the amorphization mechanism in Fe-doped Al-based nanoparticles and provide a theoretical guidance for the design of amorphous materials.
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Affiliation(s)
- Shifang Xiao
- School of Physics and Electronics, Hunan University, Changsha 410082, China.
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27
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Dong Z, Song Y. Size- and morphology-dependent structural transformations in anatase TiO2 nanowires under high pressures. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0241] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Titanium dioxide (TiO2) nanowires with two different dimensions (i.e., <100 nm and ∼200 nm in diameter) were synthesized and studied under high pressure up to 37 GPa by Raman spectroscopy and synchrotron X-ray diffraction. Direct anatase to baddeleyite phase transitions were observed in both samples upon compression, but with different onset pressures. The observed phase transitions are in contrast to bulk TiO2, where the anatase phase transforms to α-PbO2 phase and then the baddeleyite phase. Compressibility of the anatase and baddeleyite phases was found different than both nanocrystals and the corresponding bulk materials. Our comparative study demonstrated not only that the morphology of TiO2 nanowire substantially influences the high pressure behaviors, but dimensions play a determining role in terms of transformation pressures, phase stability regions, and compressibility.
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Affiliation(s)
- Zhaohui Dong
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, CAS, Shanghai 201204, P. R. China
| | - Yang Song
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
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28
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Machon D, Mélinon P. Size-dependent pressure-induced amorphization: a thermodynamic panorama. Phys Chem Chem Phys 2015; 17:903-10. [DOI: 10.1039/c4cp04633a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complex behavior of nanoparticles subjected to high-pressure is analyzed using different thermodynamic and geometrical approaches. The defect density and the surface states are identified as the main factors governing the pressure-induced transitions of nanoparticles.
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Affiliation(s)
- Denis Machon
- Institut Lumière Matière
- UMR 5306 Université Lyon 1-CNRS
- Université de Lyon
- 69622 Villeurbanne cedex
- France
| | - Patrice Mélinon
- Institut Lumière Matière
- UMR 5306 Université Lyon 1-CNRS
- Université de Lyon
- 69622 Villeurbanne cedex
- France
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29
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Li Z, Wang J, Hou Y, Bai X, Song H, Zhou Q, Wei T, Li Y, Liu B. Analysis of the upconversion photoluminescence spectra as a probe of local microstructure in Y2O3/Eu3+nanotubes under high pressure. RSC Adv 2015. [DOI: 10.1039/c4ra10042e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In situupconversion photoluminescence measurements of Y2O3/Eu3+nanotubes under high pressure were carried out with 632.8 nm laser light excitation.
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Affiliation(s)
- Zepeng Li
- School of Science
- Civil Aviation University of China
- Tianjin 300300
- China
- State Key Laboratory of Superhard Materials
| | - Jinhua Wang
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
- School of Science
| | - Yuanyuan Hou
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
| | - Xue Bai
- State Key Laboratory on Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Hongwei Song
- State Key Laboratory on Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Qingjun Zhou
- School of Science
- Civil Aviation University of China
- Tianjin 300300
- China
| | - Tong Wei
- School of Science
- Civil Aviation University of China
- Tianjin 300300
- China
| | - Yan Li
- School of Science
- Civil Aviation University of China
- Tianjin 300300
- China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
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30
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Yildirim H, Greeley JP, Sankaranarayanan SKRS. localized order-disorder transitions induced by Li segregation in amorphous TiO2 nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18962-18970. [PMID: 25303039 DOI: 10.1021/am5048398] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Li segregation and transport characteristics in amorphous TiO2 nanoparticles (NPs) are studied using molecular dynamics (MD) simulations. A strong intraparticle segregation of Li is observed, and the degree of segregation is found to correlate with Li concentration. With increasing Li concentration, Li diffusivity and segregation are enhanced, and this behavior is tied to the structural response of the NPs with increasing lithiation. The atoms in the amorphous NPs undergo rearrangement in the regions of high Li concentration, introducing new pathways for Li transport and segregation. These localized atomic rearrangements, in turn, induce preferential crystallization near the surfaces of the NPs. Such rich, dynamical responses are not expected for crystalline NPs, where the presence of well-defined lattice sites leads to limited segregation and transport at high Li concentrations. The preferential crystallization in the near-surface region in amorphous NPs may offer enhanced stability and fast Li transport for Li-ion battery applications, in addition to having potentially useful properties for other materials science applications.
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Affiliation(s)
- Handan Yildirim
- School of Chemical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
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31
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Popescu C, Sans JA, Errandonea D, Segura A, Villanueva R, Sapiña F. Compressibility and Structural Stability of Nanocrystalline TiO2 Anatase Synthesized from Freeze-Dried Precursors. Inorg Chem 2014; 53:11598-603. [DOI: 10.1021/ic501571u] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Catalin Popescu
- CELLS-ALBA Synchrotron Light Facility, 08290 Cerdanyola,
Barcelona, Spain
| | - Juan Angel Sans
- Instituto de Diseño
para la Fabricación y Producción Automatizada, MALTA
Consolider Team, Universitat Politècnica de València, 46022 València, Spain
| | - Daniel Errandonea
- ICMUV-Departamento
de Física Aplicada, MALTA Consolider Team, Universitat de València, 46100 Burjassot, Spain
| | - Alfredo Segura
- ICMUV-Departamento
de Física Aplicada, MALTA Consolider Team, Universitat de València, 46100 Burjassot, Spain
| | - Regina Villanueva
- Institut de Ciencia dels Materials, Universitat de València, Apartado
de Correos 22085, E-46071 València, Spain
| | - Fernando Sapiña
- Institut de Ciencia dels Materials, Universitat de València, Apartado
de Correos 22085, E-46071 València, Spain
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32
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Zhang H, Banfield JF. Structural Characteristics and Mechanical and Thermodynamic Properties of Nanocrystalline TiO2. Chem Rev 2014; 114:9613-44. [DOI: 10.1021/cr500072j] [Citation(s) in RCA: 228] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Hengzhong Zhang
- Department
of Earth and Planetary
Science, University of California, Berkeley, California 94720, United States
| | - Jillian F. Banfield
- Department
of Earth and Planetary
Science, University of California, Berkeley, California 94720, United States
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Petkovich ND, Rudisill SG, Wilson BE, Mukherjee A, Stein A. Control of TiO2 Grain Size and Positioning in Three-Dimensionally Ordered Macroporous TiO2/C Composite Anodes for Lithium Ion Batteries. Inorg Chem 2014; 53:1100-12. [DOI: 10.1021/ic402648f] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Nicholas D. Petkovich
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Stephen G. Rudisill
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Benjamin E. Wilson
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Anwesha Mukherjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Andreas Stein
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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34
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Li Q, Cheng B, Tian B, Liu R, Liu B, Wang F, Chen Z, Zou B, Cui T, Liu B. Pressure-induced phase transitions of TiO2 nanosheets with high reactive {001} facets. RSC Adv 2014. [DOI: 10.1039/c3ra46404k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
TiO2 nanosheets with highly reactive {001} facets show ultralow compressibility compared to those of the corresponding TiO2 nanoparticles and bulk.
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Affiliation(s)
- Quanjun Li
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Benyuan Cheng
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Baoli Tian
- Key Laboratory for Special Functional Materials of Ministry of Education
- Henan University
- Kaifeng 475004, P.R. China
| | - Ran Liu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Bo Liu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Fei Wang
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Zhiqiang Chen
- GeoScience Department
- Stony Brook University
- New York 11794, USA
| | - Bo Zou
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Tian Cui
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, P.R. China
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35
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36
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Swamy V. The structural origin of the unusual compression behaviors in nanostructured TiO2: insights from first-principles calculations. Phys Chem Chem Phys 2014; 16:18156-62. [DOI: 10.1039/c4cp02033b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First-principles calculations of anatase structured TiO2 and ZrO2 as well as of TiO2–B were carried up to 20 GPa in order to develop an understanding of the unusual compression and pressure-dependent phase transitions reported for nanocrystalline (nc) pure and Zr-doped anatase and nc TiO2–B.
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Affiliation(s)
- Varghese Swamy
- Advanced Engineering Platform
- School of Engineering
- Monash University Malaysia
- Jalan Lagoon Selatan
- Bandar Sunway, Malaysia
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37
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Lü X, Yang W, Quan Z, Lin T, Bai L, Wang L, Huang F, Zhao Y. Enhanced electron transport in Nb-doped TiO2 nanoparticles via pressure-induced phase transitions. J Am Chem Soc 2013; 136:419-26. [PMID: 24320708 DOI: 10.1021/ja410810w] [Citation(s) in RCA: 144] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Anatase TiO2 is one of the most important energy materials but suffers from poor electrical conductivity. Nb doping has been considered as an effective way to improve its performance in the applications of photocatalysis, solar cells, Li batteries, and transparent conducting oxide films. Here, we report the further enhancement of electron transport in Nb-doped TiO2 nanoparticles via pressure-induced phase transitions. The phase transition behavior and influence of Nb doping in anatase Nb-TiO2 have been systematically investigated by in situ synchrotron X-ray diffraction and Raman spectroscopy. The bulk moduli are determined to be 179.5, 163.3, 148.3, and 139.0 GPa for 0, 2.5, 5.0, and 10.0 mol % Nb-doped TiO2, respectively. The Nb-concentration-dependent stiffness variation has been demonstrated: samples with higher Nb concentrations have lower stiffness. In situ resistance measurements reveal an increase of 40% in conductivity of quenched Nb-TiO2 in comparison to the pristine anatase phase. The pressure-induced conductivity evolution is discussed in detail in terms of the packing factor model, which provides direct evidence for the rationality of the correlation of packing factors with electron transport in semiconductors. Pressure-treated Nb-doped TiO2 with unique properties surpassing those in the anatase phase holds great promise for energy-related applications.
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Affiliation(s)
- Xujie Lü
- High Pressure Science and Engineering Center, University of Nevada , Las Vegas, Nevada 89154, United States
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38
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Lü X, Hu Q, Yang W, Bai L, Sheng H, Wang L, Huang F, Wen J, Miller DJ, Zhao Y. Pressure-Induced Amorphization in Single-Crystal Ta2O5 Nanowires: A Kinetic Mechanism and Improved Electrical Conductivity. J Am Chem Soc 2013; 135:13947-53. [DOI: 10.1021/ja407108u] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xujie Lü
- High Pressure Science
and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, United States
- High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
| | - Qingyang Hu
- School of
Physics, Astronomy, and Computational Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Wenge Yang
- High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
| | - Ligang Bai
- High Pressure Science
and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, United States
| | - Howard Sheng
- School of
Physics, Astronomy, and Computational Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Lin Wang
- High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
| | - Fuqiang Huang
- CAS Key Laboratory of Materials for Energy
Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences (CAS), Shanghai 200050, People’s Republic of China
| | - Jianguo Wen
- Electron Microscopy Center, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Dean J. Miller
- Electron Microscopy Center, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Yusheng Zhao
- High Pressure Science
and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, United States
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39
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Quan Z, Luo Z, Wang Y, Xu H, Wang C, Wang Z, Fang J. Pressure-induced switching between amorphization and crystallization in PbTe nanoparticles. NANO LETTERS 2013; 13:3729-3735. [PMID: 23805798 DOI: 10.1021/nl4016705] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Combining in situ high-pressure X-ray scattering with transmission electron microscopy, we investigated the pressure-induced structural switches between the rock salt and amorphous phases as well as the associated mechanisms of their crystallization and growth in 6 nm PbTe nanocrystal. It was observed that rock salt PbTe nanocrystal started to become amorphous above 10 GPa and then underwent a low-to-high density amorphous phase transformation at pressures over 15 GPa. The low-density amorphous phase exhibited a structural memory of the rock salt phase, as manifested by a backward transformation to the rock salt phase via single nucleation inside each nanoparticle upon the release of pressure. In contrast, the high-density amorphous phase remained stable and could be preserved at ambient conditions. In addition, electron beam-induced heating could drive a recrystallization of the rock salt phase on the recovered amorphous nanoparticles. These studies provide significant insights into structural mechanisms for pressure-induced switching between amorphous and crystalline phases as well as their associated growth processes.
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Affiliation(s)
- Zewei Quan
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
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40
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Baláž P, Achimovičová M, Baláž M, Billik P, Cherkezova-Zheleva Z, Criado JM, Delogu F, Dutková E, Gaffet E, Gotor FJ, Kumar R, Mitov I, Rojac T, Senna M, Streletskii A, Wieczorek-Ciurowa K. Hallmarks of mechanochemistry: from nanoparticles to technology. Chem Soc Rev 2013; 42:7571-637. [PMID: 23558752 DOI: 10.1039/c3cs35468g] [Citation(s) in RCA: 482] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).
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Affiliation(s)
- Peter Baláž
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04353, Košice, Slovakia.
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41
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Xiong H, Yildirim H, Podsiadlo P, Zhang J, Prakapenka VB, Greeley JP, Shevchenko EV, Zhuravlev KK, Tkachev S, Sankaranarayanan SKRS, Rajh T. Compositional tuning of structural stability of lithiated cubic titania via a vacancy-filling mechanism under high pressure. PHYSICAL REVIEW LETTERS 2013; 110:078304. [PMID: 25166416 DOI: 10.1103/physrevlett.110.078304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Indexed: 06/03/2023]
Abstract
Experimental and theoretical studies on the compositional dependence of stability and compressibility in lithiated cubic titania are presented. The crystalline-to-amorphous phase transition pressure increases monotonically with Li concentration (from ∼17.5 GPa for delithiated to no phase transition for fully lithiated cubic titania up to 60 GPa). The associated enhancement in structural stability is postulated to arise from a vacancy filling mechanism in which an applied pressure drives interstitial Li ions to vacancy sites in the oxide interior. The results are of significance for understanding mechanisms of structural response of metal oxide electrode materials at high pressures as well as emerging energy storage technologies utilizing such materials.
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Affiliation(s)
- Hui Xiong
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Handan Yildirim
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Jun Zhang
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Jeffrey P Greeley
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Kirill K Zhuravlev
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Sergey Tkachev
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | | | - Tijana Rajh
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
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42
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Salamat A, McMillan PF, Firth S, Woodhead K, Hector AL, Garbarino G, Stennett MC, Hyatt NC. Structural Transformations and Disordering in Zirconolite (CaZrTi2O7) at High Pressure. Inorg Chem 2013; 52:1550-8. [DOI: 10.1021/ic302346g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ashkan Salamat
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, Cedex 9, France
| | - Paul F. McMillan
- Department of Chemistry, University College London, London WC1H 0AJ, U.K
| | - Steven Firth
- Department of Chemistry, University College London, London WC1H 0AJ, U.K
| | - Katherine Woodhead
- Department of Chemistry, University College London, London WC1H 0AJ, U.K
| | | | - Gaston Garbarino
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, Cedex 9, France
| | - Martin C. Stennett
- Department of Materials Science & Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, U.K
| | - Neil C. Hyatt
- Department of Materials Science & Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, U.K
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43
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Li Q, Liu R, Liu B, Wang L, Wang K, Li D, Zou B, Cui T, Liu J, Chen Z, Yang K. Stability and phase transition of nanoporous rutile TiO2 under high pressure. RSC Adv 2012. [DOI: 10.1039/c2ra20586f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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44
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Quan Z, Wang Y, Bae IT, Loc WS, Wang C, Wang Z, Fang J. Reversal of Hall-Petch effect in structural stability of PbTe nanocrystals and associated variation of phase transformation. NANO LETTERS 2011; 11:5531-5536. [PMID: 22044393 DOI: 10.1021/nl203409s] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Using an in situ synchrotron X-ray diffraction technique, a pressure-induced phase transformation of PbTe nanocrystals with sizes of 13 and 5 nm up to ∼20 GPa was studied. Upon an increase of pressure, we observed that the 13 nm PbTe nanocrystals start a phase transformation from rocksalt structure to an intermediate orthorhombic structure and finally CsCl-type structure at 8 GPa, which is 2 GPa higher than that in bulk PbTe. In contrast, the 5 nm PbTe nanocrystals do not display the same type of transition with a further increased transition pressure as expected. Instead of orthorhombic or CsCl-type structure, the 5 nm PbTe nanocrystals turn to amorphous phase under a similar pressure (8 GPa). Upon a release of pressure, the 13 nm PbTe nanocrystals transform from high pressure CsCl-type structure directly to rocksalt structure, whereas the 5 nm PbTe nanocrystals remain their amorphous phase to ambient conditions. The structure stability of rocksalt-type PbTe shows a significant reversal of Hall-Petch effect. On the basis of such an observation with a critical size determination of ∼9 nm, PbTe nanocrystals appear as the first class of material that demonstrates a pressure-induced structural change from order to disorder. By sharing the insight of this reversed Hall-Petch effect with associated transition types, we tuned our experimental protocol and successfully synthesized a sample with "high-pressure metastable structure", amorphous phase at ambient pressure. This integrative study provides a feasible pathway to understand nucleation mechanism as a function of particle size and to explore novel materials with high-pressure metastable structure and unique properties under lab-accessible conditions.
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Affiliation(s)
- Zewei Quan
- Department of Chemistry, Materials Science and Engineering Program, and Small Scale Systems Integration and Packaging Center, State University of New York at Binghamton, Binghamton, New York 13902, United States
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45
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Wang L, Yang W, Ding Y, Ren Y, Xiao S, Liu B, Sinogeikin SV, Meng Y, Gosztola DJ, Shen G, Hemley RJ, Mao WL, Mao HK. Size-dependent amorphization of nanoscale Y2O3 at high pressure. PHYSICAL REVIEW LETTERS 2010; 105:095701. [PMID: 20868175 DOI: 10.1103/physrevlett.105.095701] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 07/29/2010] [Indexed: 05/29/2023]
Abstract
Y2O3 with particle sizes ranging from 5 nm to 1 μm were studied at high pressure using x-ray diffraction and Raman spectroscopy techniques. Nanometer-sized Y2O3 particles are shown to be more stable than their bulk counterparts, and a grain size-dependent crystalline-amorphous transition was discovered in these materials. High-energy atomic pair distribution function measurements reveal that the amorphization is associated with the breakdown of the long-rang order of the YO6 octahedra, while the nearest-neighbor edge-shared octahedral linkages are preserved.
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Affiliation(s)
- Lin Wang
- HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
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46
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Lukowiak A, Wiglusz R, Maczka M, Gluchowski P, Strek W. IR and Raman spectroscopy study of YAG nanoceramics. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.06.033] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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47
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Huang CN, Bow JS, Zheng Y, Chen SY, Ho N, Shen P. Nonstoichiometric Titanium Oxides via Pulsed Laser Ablation in Water. NANOSCALE RESEARCH LETTERS 2010; 5:972-85. [PMID: 20672115 PMCID: PMC2894151 DOI: 10.1007/s11671-010-9591-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Accepted: 03/27/2010] [Indexed: 05/24/2023]
Abstract
Titanium oxide compounds TiO,Ti2O3, and TiO2 with a considerable extent of nonstoichiometry were fabricated by pulsed laser ablation in water and characterized by X-ray/electron diffraction, X-ray photoelectron spectroscopy and electron energy loss spectroscopy. The titanium oxides were found to occur as nanoparticle aggregates with a predominant 3+ charge and amorphous microtubes when fabricated under an average power density of ca. 1 × 108W/cm2 and 1011W/cm2, respectively followed by dwelling in water. The crystalline colloidal particles have a relatively high content of Ti2+ and hence a lower minimum band gap of 3.4 eV in comparison with 5.2 eV for the amorphous state. The protonation on both crystalline and amorphous phase caused defects, mainly titanium rather than oxygen vacancies and charge and/or volume-compensating defects. The hydrophilic nature and presumably varied extent of undercoordination at the free surface of the amorphous lamellae accounts for their rolling as tubes at water/air and water/glass interfaces. The nonstoichiometric titania thus fabricated have potential optoelectronic and catalytic applications in UV-visible range and shed light on the Ti charge and phase behavior of titania-water binary in natural shock occurrence.
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Affiliation(s)
- Chang-Ning Huang
- Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, Republic of China.
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48
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Lang M, Zhang F, Zhang J, Wang J, Schuster B, Trautmann C, Neumann R, Becker U, Ewing RC. Nanoscale manipulation of the properties of solids at high pressure with relativistic heavy ions. NATURE MATERIALS 2009; 8:793-797. [PMID: 19734884 DOI: 10.1038/nmat2528] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2009] [Accepted: 08/06/2009] [Indexed: 05/28/2023]
Abstract
High-pressure and high-temperature phases show unusual physical and chemical properties, but they are often difficult to 'quench' to ambient conditions. Here, we present a new approach, using bombardment with very high-energy, heavy ions accelerated to relativistic velocities, to stabilize a high-pressure phase. In this case, Gd(2)Zr(2)O(7), pressurized in a diamond-anvil cell up to 40 GPa, was irradiated with 20 GeV xenon or 45 GeV uranium ions, and the (previously unquenchable) cubic high-pressure phase was recovered after release of pressure. Transmission electron microscopy revealed a radiation-induced, nanocrystalline texture. Quantum-mechanical calculations confirm that the surface energy at the nanoscale is the cause of the remarkable stabilization of the high-pressure phase. The combined use of high pressure and high-energy ion irradiation provides a new means for manipulating and stabilizing new materials to ambient conditions that otherwise could not be recovered.
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Affiliation(s)
- Maik Lang
- Department of Geological Sciences, University of Michigan, 1100 N University Avenue, Ann Arbor, Michigan 48109-1005, USA
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49
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Dong Z, Song Y. Pressure-induced morphology-dependent phase transformations of nanostructured tin dioxide. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.060] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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50
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Swamy V, Kuznetsov AY, Dubrovinsky LS, Kurnosov A, Prakapenka VB. Unusual compression behavior of anatase TiO2 nanocrystals. PHYSICAL REVIEW LETTERS 2009; 103:075505. [PMID: 19792660 DOI: 10.1103/physrevlett.103.075505] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Indexed: 05/28/2023]
Abstract
The size-dependent stiffness variations in nanocrystalline anatase, a leading material for applications in photovoltaics, photocatalysis, photoelectrochromics, sensors, and optical coatings, were determined using in situ synchrotron x-ray diffraction and Raman scattering. An unusual, abrupt change in the compression curve at approximately 10 GPa and subtle breaks in the pressure shifts of the intense E(g) Raman band at approximately 10 and approximately 15 GPa have been correlated with approximately 2 A-scale disordering of nanocrystalline anatase structure that fully amorphizes under high compression.
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Affiliation(s)
- Varghese Swamy
- Department of Materials Engineering, Monash University, Victoria 3800, Australia.
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