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Jing R, Lu X, Wang J, Xiong J, Qiao Y, Zhang R, Yu Z. CeO 2-Based Frustrated Lewis Pairs via Defective Engineering: Formation Theory, Site Characterization, and Small Molecule Activation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310926. [PMID: 38239093 DOI: 10.1002/smll.202310926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/02/2024] [Indexed: 06/27/2024]
Abstract
Activation of small molecules is considered to be a central concern in the theoretical investigation of environment- and energy-related catalytic conversions. Sub-nanostructured frustrated Lewis pairs (FLPs) have been an emerging research hotspot in recent years due to their advantages in small molecule activation. Although the progress of catalytic applications of FLPs is increasingly reported, the fundamental theories related to the structural formation, site regulation, and catalytic mechanism of FLPs have not yet been fully developed. Given this, it is attempted to demonstrate the underlying theory of FLPs formation, corresponding regulation methods, and its activation mechanism on small molecules using CeO2 as the representative metal oxide. Specifically, this paper presents three fundamental principles for constructing FLPs on CeO2 surfaces, and feasible engineering methods for the regulation of FLPs sites are presented. Furthermore, cases where typical small molecules (e.g., hydrogen, carbon dioxide, methane oxygen, etc.) are activated over FLPs are analyzed. Meanwhile, corresponding future challenges for the development of FLPs-centered theory are presented. The insights presented in this paper may contribute to the theories of FLPs, which can potentially provide inspiration for the development of broader environment- and energy-related catalysis involving small molecule activation.
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Affiliation(s)
- Run Jing
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, P.R. China
| | - Xuebin Lu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, P.R. China
- School of Ecology and Environment, Tibet University, Lhasa, 850000, P.R. China
| | - Jingfei Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, P.R. China
| | - Jian Xiong
- School of Ecology and Environment, Tibet University, Lhasa, 850000, P.R. China
| | - Yina Qiao
- School of Environment and Safety Engineering, North University of China, Taiyuan, 030051, P.R. China
| | - Rui Zhang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, P.R. China
| | - Zhihao Yu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, P.R. China
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2
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Sun W, Liu Z, Xu Z, Zhang Y. Unravelling the interplay of local structure and valence transitions in Ce-doped CaYAlO 4 luminescent materials. LUMINESCENCE 2024; 39:e4591. [PMID: 37675627 DOI: 10.1002/bio.4591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/28/2023] [Accepted: 09/03/2023] [Indexed: 09/08/2023]
Abstract
Cerium has been widely used as a dopant in luminescent materials due to its unique electronic configurations. It is generally anticipated that the luminescence properties of rare-earth-doped materials are closely related to the local environment of activators, especially for Ce3+ . In addition, it is convenient to modulate its emission wavelength by adjusting the composition and structure. In this study, we systematically analyzed the microstructure of the Ce-doped CaYAlO4 system at atomic resolution. The quantitive results indicated that the structure distortion greatly influenced the valence state of the Ce dopant, which is critical to its luminescence efficiency. In addition, valence variations also exist from surface to inner structure due to the big distortion area around the surface. Our results unravel the interplay of local structure and valence transitions in Ce-doped aluminate phosphors, which has the potential to be applied in other luminescent materials.
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Affiliation(s)
- Wenhao Sun
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China
| | - Zihui Liu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China
| | - Zhipeng Xu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China
| | - Yang Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China
- Center of Advanced Analysis & Gene Sequencing, Zhengzhou University, Zhengzhou, China
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3
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Romanchuk AY, Plakhova TV, Konyukhova AD, Smirnova A, Kozlov DA, Novichkov DA, Trigub AL, Kalmykov SN. Oxidation and Nanoparticle Formation during Ce(III) Sorption onto Minerals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:5243-5251. [PMID: 36940242 DOI: 10.1021/acs.est.2c08921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The sorption of Ce(III) on three abundant environmental minerals (goethite, anatase, and birnessite) was investigated. Batch sorption experiments using a radioactive 139Ce tracer were performed to investigate the key features of the sorption process. Differences in sorption kinetics and changes in oxidation states were found in the case of the sorption of Ce(III) on birnessite compared to that on other minerals. Speciation of cerium onto all of the studied minerals was investigated using spectral and microscopic methods: high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), and X-ray absorption spectroscopy (XAS) in conjunction with theoretical calculations. It was found that during the sorption process onto birnessite, Ce(III) was oxidized to Ce(IV), while the Ce(III) on goethite and anatase surfaces remained unchanged. Oxidation of Ce(III) by sorption on birnessite was also accompanied by the formation of CeO2 nanoparticles on the mineral surface, which depended on the initial cerium concentration and pH value.
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Affiliation(s)
- Anna Yu Romanchuk
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Tatiana V Plakhova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Anastasiia D Konyukhova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Anastasiia Smirnova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Daniil A Kozlov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
- Kurnakov Institute of General and Inorganic Chemistry, Moscow, Leninskii prosp. 31, 119071 Moscow, Russia
| | - Daniil A Novichkov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Alexander L Trigub
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
- National Research Centre Kurchatov Institute, Akademika Kurchatova pl. 1, 123182 Moscow, Russia
| | - Stepan N Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
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4
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Zhang Y, Yang X, Zhao SN, Zhai Y, Pang X, Lin J. Recent Developments of Microscopic Study for Lanthanide and Manganese Doped Luminescent Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2205014. [PMID: 36310419 DOI: 10.1002/smll.202205014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Luminescent materials are indispensable for applications in lighting, displays and photovoltaics, which can transfer, absorb, store and utilize light energy. Their performance is closely related with their size and morphologies, exact atomic arrangement, and local configuration about photofunctional centers. Advanced electron microscopy-based techniques have enabled the possibility to study nanostructures with atomic resolution. Especially, with the advanced micro-electro-mechanical systems, it is able to characterize the luminescent materials at the atomic scale under various environments, providing a deep understanding of the luminescent mechanism. Accordingly, this review summarizes the recent achievements of microscopic study to directly image the microstructure and local environment of activators in lanthanide and manganese (Ln/Mn2+ )-doped luminescent materials, including: 1) bulk materials, the typical systems are nitride/oxynitride phosphors; and 2) nanomaterials, such as nanocrystals (hexagonal-phase NaLnF4 and perovskite) and 2D nanosheets (Ca2 Ta3 O10 and MoS2 ). Finally, the challenges and limitations are highlighted, and some possible solutions to facilitate the developments of advanced luminescent materials are provided.
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Affiliation(s)
- Yang Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Xuewei Yang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Shu-Na Zhao
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yalong Zhai
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Xinchang Pang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Jun Lin
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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Gold Nanoparticles Supported on Ceria Nanoparticles Modulate Leukocyte–Endothelium Cell Interactions and Inflammation in Type 2 Diabetes. Antioxidants (Basel) 2022; 11:antiox11112297. [DOI: 10.3390/antiox11112297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/09/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
Gold-ceria nanoparticles (Au/CeO2) are known to have antioxidant properties. However, whether these nanoparticles can provide benefits in type 2 diabetes mellitus (T2D) remains unknown. This work aimed to study the effects of Au/CeO2 nanoparticles at different rates of gold purity (10, 4.4, 1.79 and 0.82) on leukocyte–endothelium interactions and inflammation in T2D patients. Anthropometric and metabolic parameters, leukocyte–endothelium interactions, ROS production and NF-κB expression were assessed in 57 T2D patients and 51 healthy subjects. T2D patients displayed higher Body Mass Index (BMI) and characteristic alterations in carbohydrate and lipid metabolism. ROS production was increased in leukocytes of T2D patients and decreased by Au/CeO2 at 0.82% gold. Interestingly, Au/CeO2 0.82% modulated leukocyte–endothelium interactions (the first step in the atherosclerotic process) by increasing leukocyte rolling velocity and decreasing rolling flux and adhesion in T2D. A static adhesion assay also revealed diminished leukocyte–endothelium interactions by Au/CeO2 0.82% treatment. NF-κB (p65) levels increased in T2D patients and were reduced by Au/CeO2 treatment. Cell proliferation, viability, and apoptosis assays demonstrated no toxicity produced by Au/CeO2 nanoparticles. These results demonstrate that Au/CeO2 nanoparticles at 0.82% exert antioxidant and anti-inflammatory actions in the leukocyte–endothelium interaction of T2D patients, suggesting a protective role against the appearance of atherosclerosis and cardiovascular diseases when this condition exists.
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6
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The role of doping strategy in nanoparticle-based electrochemiluminescence biosensing. Bioelectrochemistry 2022; 148:108249. [PMID: 36029761 DOI: 10.1016/j.bioelechem.2022.108249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 08/15/2022] [Accepted: 08/17/2022] [Indexed: 11/23/2022]
Abstract
Doping plays a crucial role in electrochemiluminescence (ECL) due to the followings: (1) Modulation of electronic structure, alteration of the surface state of nanoparticles (NPs), providing effective protection from the surrounding environment, thereby leading to ECL emitters with exceptional properties including tunable spectra, high luminescence efficiency, low excitation potential, and good stability. (2) Employment of doped NPs as promising coreactant alternatives due to the presence of functional groups such as amines induced by NP doping. (3) Serving as novel co-reaction accelerators (CRAs) for ECL through doping induced high catalytic properties. (4) Behaving as excellent carriers to load ECL emitters, recognition elements, and catalysts due to doping-induced larger surface area, higher conductivity and better biocompatibility of NPs. As a consequence, doped NPs have aroused broad interest and found wide applications in various ECL sensing platforms. In this review, the current promising improvements, concepts, and excellent applications of doped NPs for ECL biosensing are addressed. We aim to bring to light the physicochemical characteristics of various doped NPs that endow them with appealing ECL performance, leading to diverse applications in biosensing.
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7
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Grzelak J, Gázquez J, Grayston A, Teles M, Herranz F, Roher N, Rosell A, Roig A, Gich M. Magnetic Mesoporous Silica Nanorods Loaded with Ceria and Functionalized with Fluorophores for Multimodal Imaging. ACS APPLIED NANO MATERIALS 2022; 5:2113-2125. [PMID: 35252779 PMCID: PMC8886853 DOI: 10.1021/acsanm.1c03837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/26/2022] [Indexed: 05/12/2023]
Abstract
Multifunctional magnetic nanocomposites based on mesoporous silica have a wide range of potential applications in catalysis, biomedicine, or sensing. Such particles combine responsiveness to external magnetic fields with other functionalities endowed by the agents loaded inside the pores or conjugated to the particle surface. Different applications might benefit from specific particle morphologies. In the case of biomedical applications, mesoporous silica nanospheres have been extensively studied while nanorods, with a more challenging preparation, have attracted much less attention despite the positive impact on the therapeutic performance shown by seminal studies. Here, we report on a sol-gel synthesis of mesoporous rodlike silica particles of two distinct lengths (1.4 and 0.9 μm) and aspect ratios (4.7 and 2.2) using Pluronic P123 as a structure-directing template and rendering ∼1 g of rods per batch. Iron oxide nanoparticles have been synthesized within the pores yielding maghemite (γ-Fe2O3) nanocrystals of elongated shape (∼7 nm × 5 nm) with a [110] preferential orientation along the rod axis and a superparamagnetic character. The performance of the rods as T2-weighted MRI contrast agents has also been confirmed. In a subsequent step, the mesoporous silica rods were loaded with a cerium compound and their surface was functionalized with fluorophores (fluorescamine and Cyanine5) emitting at λ = 525 and 730 nm, respectively, thus highlighting the possibility of multiple imaging modalities. The biocompatibility of the rods was evaluated in vitro in a zebrafish (Danio rerio) liver cell line (ZFL), with results showing that neither long nor short rods with magnetic particles caused cytotoxicity in ZFL cells for concentrations up to 50 μg/ml. We advocate that such nanocomposites can find applications in medical imaging and therapy, where the influence of shape on performance can be also assessed.
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Affiliation(s)
- Jan Grzelak
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - Jaume Gázquez
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - Alba Grayston
- Neurovascular
Research Laboratory, Vall d’Hebron
Research Institute (VHIR), 08035, Barcelona, Catalonia, Spain
| | - Mariana Teles
- Institute
of Biotechnology and Biomedicine (IBB), Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain
| | - Fernando Herranz
- Instituto
de Química Médica (IQM), Consejo
Superior de Investigaciones Científicas (CSIC), 28006 Madrid, Spain
| | - Nerea Roher
- Institute
of Biotechnology and Biomedicine (IBB), Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain
| | - Anna Rosell
- Neurovascular
Research Laboratory, Vall d’Hebron
Research Institute (VHIR), 08035, Barcelona, Catalonia, Spain
| | - Anna Roig
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - Martí Gich
- Institut
de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
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8
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Lee K, Kim S, Sun S, Lee G, Kwon J, Hwang J, Seo J, Paik U, Song T. Hydrogenated ceria nanoparticles for high-efficiency silicate adsorption. NEW J CHEM 2022. [DOI: 10.1039/d2nj04043c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The enriched Ce3+ ions were confirmed on the surface of hydrogenated ceria nanoparticles which play a key role as active sites in various chemical reactions including silicate adsorption.
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Affiliation(s)
- Kangchun Lee
- Foundry Process Development Team, Semiconductor R&D Center, Samsung Electronics, Hwaseong, Korea
| | - Sungmin Kim
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Seho Sun
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Ganggyu Lee
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Jiseok Kwon
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Junha Hwang
- Department of Energy Engineering, Hanyang University, Seoul, Korea
- Material R&D Center, KCTech, Hwaseong, Korea
| | - Jihoon Seo
- Department of Chemical and Biomolecular Engineering, Clarkson University, New York, USA
| | - Ungyu Paik
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Taeseup Song
- Department of Energy Engineering, Hanyang University, Seoul, Korea
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9
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Zhang Y, Zhao S, Feng J, Song S, Shi W, Wang D, Zhang H. Unraveling the physical chemistry and materials science of CeO2-based nanostructures. Chem 2021. [DOI: 10.1016/j.chempr.2021.02.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Bui HT, Weon S, Bae JW, Kim EJ, Kim B, Ahn YY, Kim K, Lee H, Kim W. Oxygen vacancy engineering of cerium oxide for the selective photocatalytic oxidation of aromatic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2021; 404:123976. [PMID: 33080555 DOI: 10.1016/j.jhazmat.2020.123976] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/26/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
The engineering of oxygen vacancies in CeO2 nanoparticles (NPs) allows the specific fine-tuning of their oxidation power, and this can be used to rationally control their activity and selectivity in the photocatalytic oxidation (PCO) of aromatic pollutants. In the current study, a facile strategy for generating exceptionally stable oxygen vacancies in CeO2 NPs through simple acid (CeO2-A) or base (CeO2-B) treatment was developed. The selective (or mild) PCO activities of CeO2-A and CeO2-B in the degradation of a variety of aromatic substrates in water were successfully demonstrated. CeO2-B has more oxygen vacancies and exhibits superior photocatalytic performance compared to CeO2-A. Control of oxygen vacancies in CeO2 facilitates the adsorption and reduction of dissolved O2 due to their high oxygen-storage ability. The oxygen vacancies in CeO2-B as active sites for oxygen-mediated reactions act as (i) adsorption and reduction reaction sites for dissolved O2, and (ii) photogenerated electron scavenging sites that promote the formation of H2O2 by multi-electron transfer. The oxygen vacancies in CeO2-B are particularly stable and can be used repeatedly over 30 h without losing activity. The selective PCOs of organic substrates were studied systematically, revealing that the operating mechanisms for UV-illuminated CeO2-B are very different from those for conventional TiO2 photocatalysts. Thus, the present study provides new insights into the design of defect-engineered metal oxides for the development of novel photocatalysts.
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Affiliation(s)
- Hoang Tran Bui
- Department of Chemical and Biological Engineering, Research Institute of Global Environment, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Seunghyun Weon
- School of Health and Environmental Science, Korea University, Seoul 02841, Republic of Korea
| | - Ji Won Bae
- Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Eun-Ju Kim
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Bupmo Kim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Yong-Yoon Ahn
- Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of Korea
| | - Kitae Kim
- Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of Korea
| | - Hangil Lee
- Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Republic of Korea.
| | - Wooyul Kim
- Department of Chemical and Biological Engineering, Research Institute of Global Environment, Sookmyung Women's University, Seoul 140-742, Republic of Korea.
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11
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Wei Y, Wan J, Yang N, Yang Y, Ma Y, Wang S, Wang J, Yu R, Gu L, Wang L, Wang L, Huang W, Wang D. Efficient sequential harvesting of solar light by heterogeneous hollow shells with hierarchical pores. Natl Sci Rev 2020; 7:1638-1646. [PMID: 34691499 PMCID: PMC8290956 DOI: 10.1093/nsr/nwaa059] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/01/2020] [Accepted: 03/27/2020] [Indexed: 12/18/2022] Open
Abstract
In nature, sequential harvesting of light widely exists in the old life entity, i.e. cyanobacteria, to maximize the light absorption and enhance the photosynthesis efficiency. Inspired by nature, we propose a brand new concept of temporally-spatially sequential harvesting of light in one single particle, which has purpose-designed heterogeneous hollow multi-shelled structures (HoMSs) with porous shells composed of nanoparticle subunits. Structurally, HoMSs consist of different band-gap materials outside-in, thus realizing the efficient harvesting of light with different wavelengths. Moreover, introducing oxygen vacancies into each nanoparticle subunit can also enhance the light absorption. With the benefit of sequential harvesting of light in HoMSs, the quantum efficiency at wavelength of 400 nm is enhanced by six times compared with the corresponding nanoparticles. Impressively, using these aforementioned materials as photocatalysts, highly efficient photocatalytic water splitting is realized, which cannot be achieved by using the nanoparticle counterparts. This new concept of temporally-spatially sequential harvesting of solar light paves the way for solving the ever-growing energy demand.
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Affiliation(s)
- Yanze Wei
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jiawei Wan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Nailiang Yang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Yang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yanwen Ma
- School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Songcan Wang
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia 4072, Australia
| | - Jiangyan Wang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Ranbo Yu
- Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Lin Gu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lianhui Wang
- School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Lianzhou Wang
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia 4072, Australia
| | - Wei Huang
- School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Dan Wang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
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12
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Gutiérrez-Carcedo P, Navalón S, Simó R, Setoain X, Aparicio-Gómez C, Abasolo I, Victor VM, García H, Herance JR. Alteration of the Mitochondrial Effects of Ceria Nanoparticles by Gold: An Approach for the Mitochondrial Modulation of Cells Based on Nanomedicine. NANOMATERIALS 2020; 10:nano10040744. [PMID: 32295053 PMCID: PMC7221686 DOI: 10.3390/nano10040744] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/04/2020] [Accepted: 04/07/2020] [Indexed: 12/13/2022]
Abstract
Ceria nanoparticles are cell compatible antioxidants whose activity can be enhanced by gold deposition and by surface functionalization with positive triphenylphosphonium units to selectively target the mitochondria. The antioxidant properties of these nanoparticles can serve as the basis of a new strategy for the treatment of several disorders exhibiting oxidative stress, such as cancer, diabetes or Alzheimer’s disease. However, all of these pathologies require a specific antioxidant according with their mechanism to remove oxidant species excess in cells and diminish their effect on mitochondrial function. The mechanism through which ceria nanoparticles neutralize oxidative stress and their effect on mitochondrial function have not been characterized yet. In the present study, the mitochondria antioxidant effect of ceria and ceria-supported gold nanoparticles, with or without triphenylphosphonium functionalization, was assessed in HeLa cells. The effect caused by ceria nanoparticles on mitochondria function in terms of mitochondrial membrane potential (∆Ψm), adenosine triphosphate (ATP) production, nuclear respiratory factor 1 (NRF1) and nuclear factor erythroid–2–like 1 (NFE2L1) was reversed by the presence of gold. Furthermore, this effect was enhanced when nanoparticles were functionalized with triphenylphosphonium. Our study illustrates how the mitochondrial antioxidant effect induced by ceria nanoparticles can be modulated by the presence of gold.
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Affiliation(s)
- Patricia Gutiérrez-Carcedo
- Medical Molecular Imaging Research Group, Vall d’Hebron Research Institute, CIBBIM-Nanomedicine, Universitat Autònoma de Barcelona (UAB) and Biomedical Imaging Group, Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 08035 Barcelona, Spain; (P.G.-C.); (C.A.-G.)
- Diabetes and Metabolism Research Unit, Vall d’Hebron Research Institute, Department of Endocrinology, Vall d’Hebron Research Institute, UAB, Biomedical Research Center in Diabetes Network and Associated Metabolic Diseases (CIBERDEM), 08035 Barcelona, Spain;
| | - Sergio Navalón
- Deparment of Chemistry and Instiute of Chemical Technology (CSIC-UPV), Universitat Politècnica de València, 46022 Valencia, Spain;
| | - Rafael Simó
- Diabetes and Metabolism Research Unit, Vall d’Hebron Research Institute, Department of Endocrinology, Vall d’Hebron Research Institute, UAB, Biomedical Research Center in Diabetes Network and Associated Metabolic Diseases (CIBERDEM), 08035 Barcelona, Spain;
| | - Xavier Setoain
- Hospital Clinic, Biophysics and Bioengineering Unit, Biomedicine Department, School of Medicine, University of Barcelona, and CIBER-BBN, 08036 Barcelona, Spain;
| | - Carolina Aparicio-Gómez
- Medical Molecular Imaging Research Group, Vall d’Hebron Research Institute, CIBBIM-Nanomedicine, Universitat Autònoma de Barcelona (UAB) and Biomedical Imaging Group, Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 08035 Barcelona, Spain; (P.G.-C.); (C.A.-G.)
| | - Ibane Abasolo
- Functional Validation & Preclinical Research (FVPR), Group of Drug Delivery & Targeting, CIBBIM-Nanomedicine, Vall d’Hebron Research Institute, UAB, CIBBER-BBN, 08035 Barcelona, Spain;
| | - Victor Manuel Victor
- Service of Endocrinology and Nutrition, University Hospital Doctor Peset, FISABIO, 46017 Valencia, Spain;
- CIBERehd, Department of Physiology, University of Valencia, 46010 Valencia, Spain
| | - Hermenegildo García
- Deparment of Chemistry and Instiute of Chemical Technology (CSIC-UPV), Universitat Politècnica de València, 46022 Valencia, Spain;
- Correspondence: (H.G.); (J.R.H.); Tel.: +34-96-387-7807 (H.G.); +34-93-489-3000 (ext. 4946) (J.R.H.)
| | - José Raúl Herance
- Medical Molecular Imaging Research Group, Vall d’Hebron Research Institute, CIBBIM-Nanomedicine, Universitat Autònoma de Barcelona (UAB) and Biomedical Imaging Group, Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 08035 Barcelona, Spain; (P.G.-C.); (C.A.-G.)
- Correspondence: (H.G.); (J.R.H.); Tel.: +34-96-387-7807 (H.G.); +34-93-489-3000 (ext. 4946) (J.R.H.)
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13
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Smiles DE, Batista ER, Booth CH, Clark DL, Keith JM, Kozimor SA, Martin RL, Minasian SG, Shuh DK, Stieber SCE, Tyliszczak T. The duality of electron localization and covalency in lanthanide and actinide metallocenes. Chem Sci 2020; 11:2796-2809. [PMID: 34084340 PMCID: PMC8157540 DOI: 10.1039/c9sc06114b] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 02/04/2020] [Indexed: 12/14/2022] Open
Abstract
Previous magnetic, spectroscopic, and theoretical studies of cerocene, Ce(C8H8)2, have provided evidence for non-negligible 4f-electron density on Ce and implied that charge transfer from the ligands occurs as a result of covalent bonding. Strong correlations of the localized 4f-electrons to the delocalized ligand π-system result in emergence of Kondo-like behavior and other quantum chemical phenomena that are rarely observed in molecular systems. In this study, Ce(C8H8)2 is analyzed experimentally using carbon K-edge and cerium M5,4-edge X-ray absorption spectroscopies (XAS), and computationally using configuration interaction (CI) calculations and density functional theory (DFT) as well as time-dependent DFT (TDDFT). Both spectroscopic approaches provide strong evidence for ligand → metal electron transfer as a result of Ce 4f and 5d mixing with the occupied C 2p orbitals of the C8H8 2- ligands. Specifically, the Ce M5,4-edge XAS and CI calculations show that the contribution of the 4f1, or Ce3+, configuration to the ground state of Ce(C8H8)2 is similar to strongly correlated materials such as CeRh3 and significantly larger than observed for other formally Ce4+ compounds including CeO2 and CeCl6 2-. Pre-edge features in the experimental and TDDFT-simulated C K-edge XAS provide unequivocal evidence for C 2p and Ce 4f covalent orbital mixing in the δ-antibonding orbitals of e2u symmetry, which are the unoccupied counterparts to the occupied, ligand-based δ-bonding e2u orbitals. The C K-edge peak intensities, which can be compared directly to the C 2p and Ce 4f orbital mixing coefficients determined by DFT, show that covalency in Ce(C8H8)2 is comparable in magnitude to values reported previously for U(C8H8)2. An intuitive model is presented to show how similar covalent contributions to the ground state can have different impacts on the overall stability of f-element metallocenes.
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Affiliation(s)
- Danil E Smiles
- Lawrence Berkeley National Laboratory Berkeley California 94720 USA
| | | | - Corwin H Booth
- Lawrence Berkeley National Laboratory Berkeley California 94720 USA
| | - David L Clark
- Los Alamos National Laboratory Los Alamos New Mexico 87545 USA
| | | | - Stosh A Kozimor
- Los Alamos National Laboratory Los Alamos New Mexico 87545 USA
| | | | | | - David K Shuh
- Lawrence Berkeley National Laboratory Berkeley California 94720 USA
| | | | - Tolek Tyliszczak
- Lawrence Berkeley National Laboratory Berkeley California 94720 USA
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14
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Nyoka M, Choonara YE, Kumar P, Kondiah PPD, Pillay V. Synthesis of Cerium Oxide Nanoparticles Using Various Methods: Implications for Biomedical Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E242. [PMID: 32013189 PMCID: PMC7075153 DOI: 10.3390/nano10020242] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/13/2020] [Accepted: 01/14/2020] [Indexed: 12/12/2022]
Abstract
Cerium oxide nanoparticles have been used in a number of non-medical products over the years. The therapeutic application of these nanoparticles has mainly been due to their oxidative stress ameliorating abilities. Their enzyme-mimetic catalytic ability to change between the Ce3+ and Ce4+ species makes them ideal for a role as free-radical scavengers for systemic diseases as well as neurodegenerative diseases. In this review, we look at various methods of synthesis (including the use of stabilizing/capping agents and precursors), and how the synthesis method affects the physicochemical properties, their behavior in biological environments, their catalytic abilities as well as their reported toxicity.
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Affiliation(s)
| | | | | | | | - Viness Pillay
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutics Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa; (M.N.); (Y.E.C.); (P.K.); (P.P.D.K.)
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15
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Wang ZQ, Zhang MJ, Hu XB, Dravid VP, Xu ZN, Guo GC. CeO 2-x quantum dots with massive oxygen vacancies as efficient catalysts for the synthesis of dimethyl carbonate. Chem Commun (Camb) 2020; 56:403-406. [PMID: 31821392 DOI: 10.1039/c9cc07584d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CeO2-x quantum dots with massive oxygen vacancies are obtained by a one-step single molecular synthesis strategy. The yield of dimethyl carbonate from CO2 and methanol is more than 5 times that for commercial CeO2 nanoparticles.
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Affiliation(s)
- Zhi-Qiao Wang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
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16
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Atomic-scale imaging of the defect dynamics in ceria nanowires under heating by in situ aberration-corrected TEM. Sci China Chem 2019. [DOI: 10.1007/s11426-019-9624-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Sung J, Choi BK, Kim B, Kim BH, Kim J, Lee D, Kim S, Kang K, Hyeon T, Park J. Redox-Sensitive Facet Dependency in Etching of Ceria Nanocrystals Directly Observed by Liquid Cell TEM. J Am Chem Soc 2019; 141:18395-18399. [PMID: 31644272 DOI: 10.1021/jacs.9b09508] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Defining the redox activity of different surface facets of ceria nanocrystals is important for designing an efficient catalyst. Especially in liquid-phase reactions, where surface interactions are complicated, direct investigation in a native environment is required to understand the facet-dependent redox properties. Using liquid cell TEM, we herein observed the etching of ceria-based nanocrystals under the control of redox-governing factors. Direct nanoscale observation reveals facet-dependent etching kinetics, thus identifying the specific facet ({100} for reduction and {111} for oxidation) that governs the overall etching under different chemical conditions. Under each redox condition, the contribution of the predominant facet increases as the etching reactivity increases.
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Affiliation(s)
- Jongbaek Sung
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Back Kyu Choi
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Byunghoon Kim
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,Department of Materials Science and Engineering, and Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Byung Hyo Kim
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Joodeok Kim
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Donghoon Lee
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Sungin Kim
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Kisuk Kang
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,Department of Materials Science and Engineering, and Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea.,Institute of Engineering Research, College of Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Taeghwan Hyeon
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
| | - Jungwon Park
- Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.,School of Chemical and Biological Engineering, and Institute of Chemical Process , Seoul National University , Seoul 08826 , Republic of Korea
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18
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Yang L, Jia Y, Wu D, Zhang Y, Ju H, Du Y, Ma H, Wei Q. Synthesis and Application of CeO 2/SnS 2 Heterostructures as a Highly Efficient Coreaction Accelerator in the Luminol-Dissolved O 2 System for Ultrasensitive Biomarkers Immunoassay. Anal Chem 2019; 91:14066-14073. [PMID: 31595739 DOI: 10.1021/acs.analchem.9b03796] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Electrocheluminescence (ECL) immunoassay amplified by coreaction accelerators has experienced major breakthroughs in ultrasensitive detection of biomarkers. Herein, CeO2/SnS2 heterostructures were synthesized and applied as a novel coreaction accelerator to enhance the ECL efficiency of the luminol-dissolved O2 system for the first time. Benefiting from the well-matched lattice spacing, ultrafine CeO2 nanoparticles (NPs) were grown in situ on layered SnS2 nanosheets (NSs) with improved dispersion. CeO2/SnS2 as an electroactive substrate can remarkably accelerate the generation of abundant superoxide anion radicals (O2•-) to react with luminol anion radical (L•-), achieving about 2-fold stronger ECL intensity than that of pure CeO2 NPs. To avoid harsh chemical synthesis of conventional ECL labels and simplify the antibody conjugation process, ferritin (Ft) was served as a natural nanocarrier to immobilize luminol molecules (Lum@Ft) via a one-step linkage, whose protein nanocage can easily connect with the detection antibody. Moreover, a robust site-oriented immobilization strategy using HWRGWVC heptapeptide as specific capturer was further adopted to maintain the bioactivity of the capture antibody on the amine-functionalized CeO2/SnS2 surface, which promoted the incubation efficiency markedly. On account of this advanced sensing strategy, a brand new biosensor was constructed for the accurate detection of heart failure biomarkers, which performed with favorable linearity in the range of 0.0001-50 ng/mL and achieved the detection limit of 36 fg/mL.
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Affiliation(s)
- Lei Yang
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Yue Jia
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Dan Wu
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Yong Zhang
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Huangxian Ju
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China.,State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , China
| | - Yu Du
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Hongmin Ma
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
| | - Qin Wei
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , People's Republic of China
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19
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Plakhova TV, Romanchuk AY, Butorin SM, Konyukhova AD, Egorov AV, Shiryaev AA, Baranchikov AE, Dorovatovskii PV, Huthwelker T, Gerber E, Bauters S, Sozarukova MM, Scheinost AC, Ivanov VK, Kalmykov SN, Kvashnina KO. Towards the surface hydroxyl species in CeO 2 nanoparticles. NANOSCALE 2019; 11:18142-18149. [PMID: 31555787 DOI: 10.1039/c9nr06032d] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Understanding the complex chemistry of functional nanomaterials is of fundamental importance. Controlled synthesis and characterization at the atomic level is essential to gain deeper insight into the unique chemical reactivity exhibited by many nanomaterials. Cerium oxide nanoparticles have many industrial and commercial applications, resulting from very strong catalytic, pro- and anti-oxidant activity. However, the identity of the active species and the chemical mechanisms imparted by nanoceria remain elusive, impeding the further development of new applications. Here, we explore the behavior of cerium oxide nanoparticles of different sizes at different temperatures and trace the electronic structure changes by state-of-the-art soft and hard X-ray experiments combined with computational methods. We confirm the absence of the Ce(iii) oxidation state at the surface of CeO2 nanoparticles, even for particles as small as 2 nm. Synchrotron X-ray absorption experiments at Ce L3 and M5 edges, combined with X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and small angle X-ray scattering (SAXS) and theoretical calculations demonstrate that in addition to the nanoceria charge stability, the formation of hydroxyl groups at the surface profoundly affects the chemical performance of these nanomaterials.
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Affiliation(s)
- Tatiana V Plakhova
- Lomonosov Moscow State University, Department of Chemistry, Leninskije Gory 1, Moscow, Russia
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20
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Ye L, Mahadi AH, Saengruengrit C, Qu J, Xu F, Fairclough SM, Young N, Ho PL, Shan J, Nguyen L, Tao FF, Tedsree K, Tsang SCE. Ceria Nanocrystals Supporting Pd for Formic Acid Electrocatalytic Oxidation: Prominent Polar Surface Metal Support Interactions. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00421] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lin Ye
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - A. Hanif Mahadi
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Chalathan Saengruengrit
- Department of Chemistry, Faculty of Science, Burapha University, Bangsaen, Chonburi 20131, Thailand
| | - Jin Qu
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Feng Xu
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Simon M. Fairclough
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Neil Young
- Department of Materials, University of Oxford, Oxford OX1 3PH, U.K
| | - Ping-Luen Ho
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Junjun Shan
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
| | - Luan Nguyen
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
| | - Franklin F. Tao
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
| | - Karaked Tedsree
- Department of Chemistry, Faculty of Science, Burapha University, Bangsaen, Chonburi 20131, Thailand
| | - S. C. Edman Tsang
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
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21
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Sims CM, Maier RA, Johnston-Peck AC, Gorham JM, Hackley VA, Nelson BC. Approaches for the quantitative analysis of oxidation state in cerium oxide nanomaterials. NANOTECHNOLOGY 2019; 30:085703. [PMID: 30240366 PMCID: PMC6351072 DOI: 10.1088/1361-6528/aae364] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Cerium oxide nanomaterials (nanoceria, CNMs) are receiving increased attention from the research community due to their unique chemical properties, most prominent of which is their ability to alternate between the Ce3+ and Ce4+ oxidation states. While many analytical techniques and methods have been employed to characterize the amounts of Ce3+ and Ce4+ present (Ce3+/Ce4+ ratio) within nanoceria materials, to-date no studies have used multiple complementary analytical tools (orthogonal analysis) with technique-independent oxidation state controls for quantitative determinations of the Ce3+/Ce4+ ratio. Here, we describe the development of analytical methods measuring the oxidation states of nanoceria analytes using technique-independent Ce3+ (CeAlO3:Ge) and Ce4+ (CeO2) control materials, with a particular focus on x-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) approaches. The developed methods were demonstrated in characterizing a suite of commercial nanoceria products, where the two techniques (XPS and EELS) were found to be in good agreement with respect to Ce3+/Ce4+ ratio. Potential sources of artifacts and discrepancies in the measurement results were also identified and discussed, alongside suggestions for interpreting oxidation state results using the different analytical techniques. The results should be applicable towards producing more consistent and reproducible oxidation state analyses of nanoceria materials.
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Affiliation(s)
- Christopher M. Sims
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Russell A. Maier
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Aaron C. Johnston-Peck
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Justin M. Gorham
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Vincent A. Hackley
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Bryant C. Nelson
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
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22
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Application of Electron Microscopes in Nanotoxicity Assessment. Methods Mol Biol 2018. [PMID: 30547465 DOI: 10.1007/978-1-4939-8916-4_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
In this chapter, we highlight the applications of electron microscopes (EMs) in nanotoxicity assessment. EMs can provide detailed information about the size and morphology of nanomaterials (NMs), their localization in cells and tissues, the nano-bio interactions, as well as the ultrastructural changes induced by NMs exposure. Here, we share with the readers how we prepare the tissue sample, and the different types of EMs used among the nanotoxicologists. It is possible to deploy conventional EMs along or in combination with other analytical techniques, such as electron energy loss spectroscopy (EELS), energy dispersive X-ray spectroscopy (EDS or EDX), and TEM-assisted scanning transmission X-ray microscopy (STXM), toward further elemental and chemical characterization. Appropriate images are inserted to illustrate throughout this chapter.
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23
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Johnston-Peck AC, Yang WCD, Winterstein JP, Sharma R, Herzing AA. In situ oxidation and reduction of cerium dioxide nanoparticles studied by scanning transmission electron microscopy. Micron 2018; 115:54-63. [PMID: 30212712 PMCID: PMC6392188 DOI: 10.1016/j.micron.2018.08.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/23/2018] [Accepted: 08/24/2018] [Indexed: 11/29/2022]
Abstract
Cerium dioxide nanocubes and truncated octahedra were reduced and oxidized in the scanning transmission electron microscope. The reduction process was stimulated by the electron beam and oxidation was supported by background gases in the microscope environment. High-angle annular dark field imaging is sensitive to local lattice distortions that arise as oxygen vacancies are created and cerium cations reduce enabling high spatial resolution characterization of this process with temporal resolution on the order of seconds. Such measurements enable us to differentiate and infer that the observed behavior between the nanocubes and truncated octahedra may be due to the difference in crystallographic termination of surfaces. In situ measurements taken with different partial pressures of oxygen reveal the cerium oxidation state and the dose rate threshold for the onset of beam reduction are influenced by the environment. Increasing oxygen partial pressure reduces the Ce3+ content and decreases susceptibility to electron beam driven reduction.
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Affiliation(s)
- Aaron C Johnston-Peck
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Wei-Chang D Yang
- Center for Nanoscience and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; Maryland NanoCenter University of Maryland College Park, MD 20742, USA
| | - Jonathan P Winterstein
- Center for Nanoscience and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Renu Sharma
- Center for Nanoscience and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Andrew A Herzing
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
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24
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Schmid H, Gilardi E, Gregori G, Longo P, Maier J, van Aken PA. Structure and chemistry of interfaces between ceria and yttria-stabilized zirconia studied by analytical STEM. Ultramicroscopy 2018; 188:90-100. [PMID: 29602057 DOI: 10.1016/j.ultramic.2018.01.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 01/16/2018] [Accepted: 01/27/2018] [Indexed: 11/18/2022]
Abstract
Epitaxial undoped and Gd2O3-doped ceria films were grown by pulsed laser deposition on (1 1 1) faced Y2O3-stabilized zirconia (YSZ). Highly localized cerium reduction at the film-substrate interfaces is revealed by atomically resolved valence EELS mapping using Cs aberration-corrected scanning transmission electron microscopy. The chemical profiles reveal interdiffusion of Ce, (Gd), Y, Zr, forming an intermixing zone at the interface 7-9 (1 1 1) lattice planes wide. In its vicinity, the fraction of Ce3+ raises gradually over 6-8 lattice planes from zero in the bulk ceria to ≈100% in one single plane at the interface. Beyond this plane the Ce3+ fraction drops sharply within the YSZ substrate. In the vicinity of the interface systematic scan deflections are observed during EELS line scans. The advancing electron probe experiences a retarding force at the ceria side, and an accelerating force at the YSZ side, irrespective of the scan direction. This behavior is suggestive of coulombic interactions between the electron probe and a charged interface. This is interpreted as an indication of the presence of a space-charge situation at the YSZ/ceria interface, resulting from an excess negative charge at the ceria side (due to Ce3+cations) and an excess positive charge at the YSZ side (due to oxygen vacancies).
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Affiliation(s)
- H Schmid
- Stuttgart Center for Electron Microscopy at the Max Planck Institute for Solid State Research (MPI-FKF), Heisenbergstrasse 1, Stuttgart, 70569, Germany.
| | - E Gilardi
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - G Gregori
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - P Longo
- Gatan Inc., Pleasanton, CA, USA
| | - J Maier
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - P A van Aken
- Stuttgart Center for Electron Microscopy at the Max Planck Institute for Solid State Research (MPI-FKF), Heisenbergstrasse 1, Stuttgart, 70569, Germany.
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25
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Ogura Y, Sato K, Miyahara SI, Kawano Y, Toriyama T, Yamamoto T, Matsumura S, Hosokawa S, Nagaoka K. Efficient ammonia synthesis over a Ru/La 0.5Ce 0.5O 1.75 catalyst pre-reduced at high temperature. Chem Sci 2018; 9:2230-2237. [PMID: 29719696 PMCID: PMC5897884 DOI: 10.1039/c7sc05343f] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 01/13/2018] [Indexed: 01/08/2023] Open
Abstract
A Ru/La0.5Ce0.5O1.75 catalyst pre-reduced at an unusually high temperature (650 °C) catalyses ammonia synthesis at a high rate under mild conditions.
Ammonia is an important feedstock for producing fertiliser and is also a potential energy carrier. However, the process currently used for ammonia synthesis, the Haber–Bosch process, consumes a huge amount of energy; therefore the development of new catalysts for synthesising ammonia at a high rate under mild conditions (low temperature and low pressure) is necessary. Here, we show that Ru/La0.5Ce0.5O1.75 pre-reduced at an unusually high temperature (650 °C) catalysed ammonia synthesis at extremely high rates under mild conditions; specifically, at a reaction temperature of 350 °C, the rates were 13.4, 31.3, and 44.4 mmol g–1 h–1 at 0.1, 1.0, and 3.0 MPa, respectively. Kinetic analysis revealed that this catalyst is free of hydrogen poisoning under the conditions tested. Electron energy loss spectroscopy combined with O2 absorption capacity measurements revealed that the reduced catalyst consisted of fine Ru particles (mean diameter < 2.0 nm) that were partially covered with partially reduced La0.5Ce0.5O1.75 and were dispersed on a thermostable support. Furthermore, Fourier transform infrared spectra measured after N2 addition to the catalyst revealed that N2 adsorption on Ru atoms that interacted directly with the reduced La0.5Ce0.5O1.75 weakened the N
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N bond and thus promoted its cleavage, which is the rate-determining step for ammonia synthesis. Our results indicate that high-temperature pre-reduction of this catalyst, which consists of Ru supported on a thermostable composite oxide with a cubic fluorite structure and containing reducible cerium, resulted in the formation of many sites that were highly active for N2 reduction by hydrogen.
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Affiliation(s)
- Yuta Ogura
- Department of Integrated Science and Technology , Faculty of Science and Technology , Oita University , 700 Dannoharu , Oita 870-1192 , Japan .
| | - Katsutoshi Sato
- Department of Integrated Science and Technology , Faculty of Science and Technology , Oita University , 700 Dannoharu , Oita 870-1192 , Japan . .,Elements Strategy Initiative for Catalysts and Batteries , Kyoto University , 1-30 Goryo-Ohara, Nishikyo-ku , Kyoto 615-8245 , Japan
| | - Shin-Ichiro Miyahara
- Department of Integrated Science and Technology , Faculty of Science and Technology , Oita University , 700 Dannoharu , Oita 870-1192 , Japan .
| | - Yukiko Kawano
- Department of Integrated Science and Technology , Faculty of Science and Technology , Oita University , 700 Dannoharu , Oita 870-1192 , Japan .
| | - Takaaki Toriyama
- The Ultramicroscopy Research Center , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Tomokazu Yamamoto
- Department of Applied Quantum Physics and Nuclear Engineering , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Syo Matsumura
- The Ultramicroscopy Research Center , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan.,Department of Applied Quantum Physics and Nuclear Engineering , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Saburo Hosokawa
- Elements Strategy Initiative for Catalysts and Batteries , Kyoto University , 1-30 Goryo-Ohara, Nishikyo-ku , Kyoto 615-8245 , Japan
| | - Katsutoshi Nagaoka
- Department of Integrated Science and Technology , Faculty of Science and Technology , Oita University , 700 Dannoharu , Oita 870-1192 , Japan .
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26
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Swallow JG, Lee JK, Defferriere T, Hughes GM, Raja SN, Tuller HL, Warner JH, Van Vliet KJ. Atomic Resolution Imaging of Nanoscale Chemical Expansion in Pr xCe 1-xO 2-δ during In Situ Heating. ACS NANO 2018; 12:1359-1372. [PMID: 29338198 DOI: 10.1021/acsnano.7b07732] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Thin film nonstoichiometric oxides enable many high-temperature applications including solid oxide fuel cells, actuators, and catalysis. Large concentrations of point defects (particularly, oxygen vacancies) enable fast ionic conductivity or gas exchange kinetics in these materials but also manifest as coupling between lattice volume and chemical composition. This chemical expansion may be either detrimental or useful, especially in thin film devices that may exhibit enhanced performance through strain engineering or decreased operating temperatures. However, thin film nonstoichiometric oxides can differ from bulk counterparts in terms of operando defect concentrations, transport properties, and mechanical properties. Here, we present an in situ investigation of atomic-scale chemical expansion in PrxCe1-xO2-δ (PCO), a mixed ionic-electronic conducting oxide relevant to electrochemical energy conversion and high-temperature actuation. Through a combination of electron energy loss spectroscopy and transmission electron microscopy with in situ heating, we characterized chemical strains and changes in oxidation state in cross sections of PCO films grown on yttria-stabilized zirconia (YSZ) at temperatures reaching 650 °C. We quantified, both statically and dynamically, the nanoscale chemical expansion induced by changes in PCO redox state as a function of position and direction relative to the film-substrate interface. Additionally, we observed dislocations at the film-substrate interface, as well as reduced cation localization to threading defects within PCO films. These results illustrate several key aspects of atomic-scale structure and mechanical deformation in nonstoichiometric oxide films that clarify distinctions between films and bulk counterparts and that hold several implications for operando chemical expansion or "breathing" of such oxide films.
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Affiliation(s)
- Jessica G Swallow
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Ja Kyung Lee
- Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom
| | - Thomas Defferriere
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Gareth M Hughes
- Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom
| | - Shilpa N Raja
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Harry L Tuller
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Jamie H Warner
- Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom
| | - Krystyn J Van Vliet
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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27
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Kelly D, Zhou M, Clark N, Hamer MJ, Lewis EA, Rakowski AM, Haigh SJ, Gorbachev RV. Nanometer Resolution Elemental Mapping in Graphene-Based TEM Liquid Cells. NANO LETTERS 2018; 18:1168-1174. [PMID: 29323499 PMCID: PMC5821409 DOI: 10.1021/acs.nanolett.7b04713] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/08/2017] [Indexed: 05/26/2023]
Abstract
We demonstrate a new design of graphene liquid cell consisting of a thin lithographically patterned hexagonal boron nitride crystal encapsulated on both sides with graphene windows. The ultrathin window liquid cells produced have precisely controlled volumes and thicknesses and are robust to repeated vacuum cycling. This technology enables exciting new opportunities for liquid cell studies, providing a reliable platform for high resolution transmission electron microscope imaging and spectral mapping. The presence of water was confirmed using electron energy loss spectroscopy (EELS) via the detection of the oxygen K-edge and measuring the thickness of full and empty cells. We demonstrate the imaging capabilities of these liquid cells by tracking the dynamic motion and interactions of small metal nanoparticles with diameters of 0.5-5 nm. We further present an order of magnitude improvement in the analytical capabilities compared to previous liquid cell data with 1 nm spatial resolution elemental mapping achievable for liquid encapsulated bimetallic nanoparticles using energy dispersive X-ray spectroscopy (EDXS).
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Affiliation(s)
- Daniel
J. Kelly
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Mingwei Zhou
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Nick Clark
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Matthew J. Hamer
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Edward A. Lewis
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Alexander M. Rakowski
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Sarah J. Haigh
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
| | - Roman V. Gorbachev
- School of Materials, School of Physics and Astronomy, and National Graphene
Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United
Kingdom
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28
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Graham UM, Yokel RA, Dozier AK, Drummy L, Mahalingam K, Tseng MT, Birch E, Fernback J. Analytical High-resolution Electron Microscopy Reveals Organ-specific Nanoceria Bioprocessing. Toxicol Pathol 2018; 46:47-61. [PMID: 29145781 PMCID: PMC5954437 DOI: 10.1177/0192623317737254] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This is the first utilization of advanced analytical electron microscopy methods, including high-resolution transmission electron microscopy, high-angle annular dark field scanning transmission electron microscopy, electron energy loss spectroscopy, and energy-dispersive X-ray spectroscopy mapping to characterize the organ-specific bioprocessing of a relatively inert nanomaterial (nanoceria). Liver and spleen samples from rats given a single intravenous infusion of nanoceria were obtained after prolonged (90 days) in vivo exposure. These advanced analytical electron microscopy methods were applied to elucidate the organ-specific cellular and subcellular fate of nanoceria after its uptake. Nanoceria is bioprocessed differently in the spleen than in the liver.
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Affiliation(s)
- Uschi M Graham
- 1 Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Academic Medical Center, Lexington, Kentucky, USA
- 2 National Institute of Occupational Safety and Health, Cincinnati, Ohio, USA
| | - Robert A Yokel
- 1 Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Academic Medical Center, Lexington, Kentucky, USA
| | - Alan K Dozier
- 2 National Institute of Occupational Safety and Health, Cincinnati, Ohio, USA
| | | | | | - Michael T Tseng
- 4 Department of Anatomical Sciences and Neurobiology, College of Medicine, University of Louisville, Louisville, Kentucky, USA
| | - Eileen Birch
- 2 National Institute of Occupational Safety and Health, Cincinnati, Ohio, USA
| | - Joseph Fernback
- 2 National Institute of Occupational Safety and Health, Cincinnati, Ohio, USA
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29
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Bugnet M, Overbury SH, Wu ZL, Epicier T. Direct Visualization and Control of Atomic Mobility at {100} Surfaces of Ceria in the Environmental Transmission Electron Microscope. NANO LETTERS 2017; 17:7652-7658. [PMID: 29166035 DOI: 10.1021/acs.nanolett.7b03680] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ceria is one of the world's most prominent material for applications in heterogeneous catalysis, as catalyst support or catalyst itself. Despite an exhaustive literature on the structure of reactive facets of CeO2 in line with its catalytic mechanisms, the temporal evolution of the atomic surface structure exposed to realistic redox conditions remains elusive. Here, we provide a direct visualization of the atomic mobility of cerium atoms on {100} surfaces of CeO2 nanocubes at room temperature in high vacuum, O2, and CO2 atmospheres in an environmental transmission electron microscope. Through quantification of the cationic mobility, we demonstrate the control of the surface dynamics under exposure to O2 and CO2 atmospheres, providing opportunities for a better understanding of the intimate catalytic mechanisms.
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Affiliation(s)
- M Bugnet
- University of Lyon, INSA Lyon, UCBL Lyon 1, MATEIS, UMR 5510 CNRS , 69100 Villeurbanne Cedex, France
| | - S H Overbury
- Chemical Science Division, Center for Nanophase Materials Science, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Z L Wu
- Chemical Science Division, Center for Nanophase Materials Science, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - T Epicier
- University of Lyon, INSA Lyon, UCBL Lyon 1, MATEIS, UMR 5510 CNRS , 69100 Villeurbanne Cedex, France
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30
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Minasian SG, Batista ER, Booth CH, Clark DL, Keith JM, Kozimor SA, Lukens WW, Martin RL, Shuh DK, Stieber SCE, Tylisczcak T, Wen XD. Quantitative Evidence for Lanthanide-Oxygen Orbital Mixing in CeO2, PrO2, and TbO2. J Am Chem Soc 2017; 139:18052-18064. [DOI: 10.1021/jacs.7b10361] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stefan G. Minasian
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Enrique R. Batista
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Corwin H. Booth
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - David L. Clark
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Jason M. Keith
- Colgate University, Hamilton, New York 13346, United States
| | - Stosh A. Kozimor
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Wayne W. Lukens
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Richard L. Martin
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - David K. Shuh
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | | | - Tolek Tylisczcak
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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31
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Du H, Wan T, Qu B, Scott J, Lin X, Younis A, Chu D. Tailoring the multi-functionalities of one-dimensional ceria nanostructures via oxygen vacancy modulation. J Colloid Interface Sci 2017; 504:305-314. [DOI: 10.1016/j.jcis.2017.05.057] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/16/2017] [Accepted: 05/17/2017] [Indexed: 11/28/2022]
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32
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Merrifield RC, Arkill KP, Palmer RE, Lead JR. A High Resolution Study of Dynamic Changes of Ce 2O 3 and CeO 2 Nanoparticles in Complex Environmental Media. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8010-8016. [PMID: 28618231 DOI: 10.1021/acs.est.7b01130] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ceria nanoparticles (NPs) rapidly and easily cycle between Ce(III) and Ce(IV) oxidation states, making them prime candidates for commercial and other applications. Increased commercial use has resulted in increased discharge to the environment and increased associated risk. Once in complex media such as environmental waters or toxicology exposure media, the same redox transformations can occur, causing altered behavior and effects compared to the pristine NPs. This study used high resolution scanning transmission electron microscopy and electron energy loss spectroscopy to investigate changes in structure and oxidation state of small, polymer-coated ceria suspensions in complex media. NPs initially in either the III or IV oxidation states, but otherwise identical, were used. Ce(IV) NPs were changed to mixed (III, IV) NPs at high ionic strengths, while the presence of natural organic macromolecules (NOM) stabilized the oxidation state and increased crystallinity. The Ce(III) NPs remained as Ce(III) at high ionic strengths, but were modified by the presence of NOM, causing reduced crystallinity and degradation of the NPs. Subtle changes to NP properties upon addition to environmental or ecotoxicology media suggest that there may be small but important effects on fate and effects of NPs compared to their pristine form.
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Affiliation(s)
- Ruth C Merrifield
- Department of Geography, Earth and Environmental Sciences, University of Birmingham , Birmingham, U.K
- Center for Environmental Nanoscience and Risk, University of South Carolina , Columbia, South Carolina United States
| | - Kenton P Arkill
- School of Medicine, University of Nottingham , Nottingham, U.K
- CSIC UPV/EHU and PiE, University of the Basque Country , Lejona, Spain
| | - Richard E Palmer
- Nanoscale Physics Research Laboratory, Physics and Astronomy, University of Birmingham , Birmingham, U.K
| | - Jamie R Lead
- Department of Geography, Earth and Environmental Sciences, University of Birmingham , Birmingham, U.K
- Center for Environmental Nanoscience and Risk, University of South Carolina , Columbia, South Carolina United States
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33
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Sinclair R, Lee SC, Shi Y, Chueh WC. Structure and chemistry of epitaxial ceria thin films on yttria-stabilized zirconia substrates, studied by high resolution electron microscopy. Ultramicroscopy 2017; 176:200-211. [DOI: 10.1016/j.ultramic.2017.03.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/15/2016] [Accepted: 12/28/2016] [Indexed: 11/26/2022]
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34
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Publisher's Note. Ultramicroscopy 2017; 175:25-35. [DOI: 10.1016/j.ultramic.2016.12.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/15/2016] [Accepted: 12/28/2016] [Indexed: 11/26/2022]
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35
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Xiong Y, Li L, Zhang L, Cao Y, Yu S, Tang C, Dong L. Migration of copper species in CexCu1−xO2 catalyst driven by thermal treatment and the effect on CO oxidation. Phys Chem Chem Phys 2017; 19:21840-21847. [DOI: 10.1039/c7cp03735j] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A Cu-doped CeO2 solid solution was constructed by co-precipitation and additional acid treatment to investigate the behavior of doped copper under thermal treatment.
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Affiliation(s)
- Yan Xiong
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Lulu Li
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Lei Zhang
- School of Environmental and Chemical Engineering
- Chongqing Three Gorges University
- Wanzhou
- Chongqing 404000
- P. R. China
| | - Yuan Cao
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Shuohan Yu
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Changjin Tang
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Lin Dong
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
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36
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Graham UM, Jacobs G, Yokel RA, Davis BH, Dozier AK, Birch ME, Tseng MT, Oberdörster G, Elder A, DeLouise L. From Dose to Response: In Vivo Nanoparticle Processing and Potential Toxicity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 947:71-100. [PMID: 28168666 PMCID: PMC6376403 DOI: 10.1007/978-3-319-47754-1_4] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Adverse human health impacts due to occupational and environmental exposures to manufactured nanoparticles are of concern and pose a potential threat to the continued industrial use and integration of nanomaterials into commercial products. This chapter addresses the inter-relationship between dose and response and will elucidate on how the dynamic chemical and physical transformation and breakdown of the nanoparticles at the cellular and subcellular levels can lead to the in vivo formation of new reaction products. The dose-response relationship is complicated by the continuous physicochemical transformations in the nanoparticles induced by the dynamics of the biological system, where dose, bio-processing, and response are related in a non-linear manner. Nanoscale alterations are monitored using high-resolution imaging combined with in situ elemental analysis and emphasis is placed on the importance of the precision of characterization. The result is an in-depth understanding of the starting particles, the particle transformation in a biological environment, and the physiological response.
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Affiliation(s)
- Uschi M Graham
- University of Kentucky, Lexington, KY, USA.
- CDC/NIOSH DART, Cincinnati, OH, USA.
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37
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Goris B, Meledina M, Turner S, Zhong Z, Batenburg KJ, Bals S. Three dimensional mapping of Fe dopants in ceria nanocrystals using direct spectroscopic electron tomography. Ultramicroscopy 2016; 171:55-62. [DOI: 10.1016/j.ultramic.2016.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 08/22/2016] [Accepted: 08/29/2016] [Indexed: 11/26/2022]
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38
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Spadaro MC, Luches P, Bertoni G, Grillo V, Turner S, Van Tendeloo G, Valeri S, D'Addato S. Influence of defect distribution on the reducibility of CeO2-x nanoparticles. NANOTECHNOLOGY 2016; 27:425705. [PMID: 27631569 DOI: 10.1088/0957-4484/27/42/425705] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ceria nanoparticles (NPs) are fundamental in heterogeneous catalysis because of their ability to store or release oxygen depending on the ambient conditions. Their oxygen storage capacity is strictly related to the exposed planes, crystallinity, density and distribution of defects. In this work a study of ceria NPs produced with a ligand-free, physical synthesis method is presented. The NP films were grown by a magnetron sputtering based gas aggregation source and studied by high resolution- and scanning-transmission electron microscopy and x-ray photoelectron spectroscopy. In particular, the influence of the oxidation procedure on the NP reducibility has been investigated. The different reducibility has been correlated to the exposed planes, crystallinity and density and distribution of structural defects. The results obtained in this work represent a basis to obtain cerium oxide NP with desired oxygen transport properties.
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Affiliation(s)
- Maria Chiara Spadaro
- Dipartimento FIM, Università di Modena e Reggio Emilia, via G. Campi 213/a, I-41125 Modena, Italy. CNR-NANO, via G. Campi 213/a, I-41125 Modena, Italy
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39
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40
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Torruella P, Arenal R, de la Peña F, Saghi Z, Yedra L, Eljarrat A, López-Conesa L, Estrader M, López-Ortega A, Salazar-Alvarez G, Nogués J, Ducati C, Midgley PA, Peiró F, Estradé S. 3D Visualization of the Iron Oxidation State in FeO/Fe3O4 Core-Shell Nanocubes from Electron Energy Loss Tomography. NANO LETTERS 2016; 16:5068-73. [PMID: 27383904 DOI: 10.1021/acs.nanolett.6b01922] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The physicochemical properties used in numerous advanced nanostructured devices are directly controlled by the oxidation states of their constituents. In this work we combine electron energy-loss spectroscopy, blind source separation, and computed tomography to reconstruct in three dimensions the distribution of Fe(2+) and Fe(3+) ions in a FeO/Fe3O4 core/shell cube-shaped nanoparticle with nanometric resolution. The results highlight the sharpness of the interface between both oxides and provide an average shell thickness, core volume, and average cube edge length measurements in agreement with the magnetic characterization of the sample.
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Affiliation(s)
- Pau Torruella
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Raúl Arenal
- Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
- Fundación ARAID, 50018 Zaragoza, Spain
| | - Francisco de la Peña
- Department of Materials Science & Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge, CB3 0FS, United Kingdom
| | - Zineb Saghi
- CEA-LETI, MINATEC, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
| | - Lluís Yedra
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Alberto Eljarrat
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Lluís López-Conesa
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Marta Estrader
- Laboratoire de Physique et Chimie des Nano-objects , 135 Avenue de Rangueil, 31077 Toulouse Cedex 4, France
| | - Alberto López-Ortega
- INSTM and Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze , Via della Lastruccia 3, Sesto Fiorentino, I-50019 Firenze, Italy
| | - Germán Salazar-Alvarez
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University , 10691 Stockholm, Sweden
| | - Josep Nogués
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats , Passeig de Lluís Companys, 23, 08010 Barcelona, Spain
| | - Caterina Ducati
- Department of Materials Science & Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge, CB3 0FS, United Kingdom
| | - Paul A Midgley
- Department of Materials Science & Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge, CB3 0FS, United Kingdom
| | - Francesca Peiró
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Sonia Estradé
- LENS-MIND-IN2UB, Departament d'Electrònica, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona , Martí i Franquès 1, E-08028 Barcelona, Spain
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41
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Bowman W, March K, Hernandez C, Crozier P. Measuring bandgap states in individual non-stoichiometric oxide nanoparticles using monochromated STEM EELS: The Praseodymium–ceria case. Ultramicroscopy 2016; 167:5-10. [DOI: 10.1016/j.ultramic.2016.04.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 04/21/2016] [Accepted: 04/26/2016] [Indexed: 11/25/2022]
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42
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Johnston-Peck AC, DuChene JS, Roberts AD, Wei WD, Herzing AA. Dose-rate-dependent damage of cerium dioxide in the scanning transmission electron microscope. Ultramicroscopy 2016; 170:1-9. [PMID: 27469265 DOI: 10.1016/j.ultramic.2016.07.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 06/17/2016] [Accepted: 07/03/2016] [Indexed: 11/15/2022]
Abstract
Beam damage caused by energetic electrons in the transmission electron microscope is a fundamental constraint limiting the collection of artifact-free information. Through understanding the influence of the electron beam, experimental routines may be adjusted to improve the data collection process. Investigations of CeO2 indicate that there is not a critical dose required for the accumulation of electron beam damage. Instead, measurements using annular dark field scanning transmission electron microscopy and electron energy loss spectroscopy demonstrate that the onset of measurable damage occurs when a critical dose rate is exceeded. The mechanism behind this phenomenon is that oxygen vacancies created by exposure to a 300keV electron beam are actively annihilated as the sample re-oxidizes in the microscope environment. As a result, only when the rate of vacancy creation exceeds the recovery rate will beam damage begin to accumulate. This observation suggests that dose-intensive experiments can be accomplished without disrupting the native structure of the sample when executed using dose rates below the appropriate threshold. Furthermore, the presence of an encapsulating carbonaceous layer inhibits processes that cause beam damage, markedly increasing the dose rate threshold for the accumulation of damage.
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Affiliation(s)
- Aaron C Johnston-Peck
- Materials Measurement Lab, National Institute of Standards Technology, Gaithersburg, MD 20899, USA.
| | - Joseph S DuChene
- Department of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, FL 32611, USA
| | - Alan D Roberts
- Department of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, FL 32611, USA
| | - Wei David Wei
- Department of Chemistry and Center for Nanostructured Electronic Materials, University of Florida, Gainesville, FL 32611, USA
| | - Andrew A Herzing
- Materials Measurement Lab, National Institute of Standards Technology, Gaithersburg, MD 20899, USA
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Pham TA, Altman AB, Stieber SCE, Booth CH, Kozimor SA, Lukens WW, Olive DT, Tyliszczak T, Wang J, Minasian SG, Raymond KN. A Macrocyclic Chelator That Selectively Binds Ln4+ over Ln3+ by a Factor of 1029. Inorg Chem 2016; 55:9989-10002. [DOI: 10.1021/acs.inorgchem.6b00684] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tiffany A. Pham
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Alison B. Altman
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - S. Chantal E. Stieber
- Los Alamos National Laboratory (LANL), Los
Alamos, New Mexico 87545, United States
- California State Polytechnic University, Pomona, California 91768, United States
| | - Corwin H. Booth
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Stosh A. Kozimor
- Los Alamos National Laboratory (LANL), Los
Alamos, New Mexico 87545, United States
| | - Wayne W. Lukens
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Daniel T. Olive
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Tolek Tyliszczak
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Jian Wang
- Canadian Light Source (CLS), Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Stefan G. Minasian
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Kenneth N. Raymond
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
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44
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Wang JX, Zhuo Y, Zhou Y, Wang HJ, Yuan R, Chai YQ. Ceria Doped Zinc Oxide Nanoflowers Enhanced Luminol-Based Electrochemiluminescence Immunosensor for Amyloid-β Detection. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12968-12975. [PMID: 27145690 DOI: 10.1021/acsami.6b00021] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, ceria doped ZnO nanomaterials with flower-structure (Ce:ZONFs) were prepared to construct a luminol-based electrochemiluminescence (ECL) immunosensor for amyloid-β protein (Aβ) detection. Herein, carboxyl groups (-COOH) covered Ce:ZONFs were synthesized by a green method with lysine as reductant. After that, Ce:ZONFs-based ECL nanocomposite was prepared by combining the luminophore of luminol and Ce:ZONFs via amidation and physical absorption. Luminol modified on Ce:ZONFs surface could generate a strong ECL signal under the assistance of reactive oxygen species (ROSs) (such as OH(•) and O2(•-)), which were produced by a catalytic reaction between Ce:ZONFs and H2O2. It was worth noticing that a quick Ce(4+) ↔ Ce(3+) reaction in this doped material could increase the rate of electron transfer to realize the signal amplification. Subsequently, the luminol functionalized Ce:ZONFs (Ce:ZONFs-Lum) were covered by secondary antibody (Ab2) and glucose oxidase (GOD), respectively, to construct a novel Ab2 bioconjugate (Ab2-GOD@Ce:ZONFs-Lum). The wire-structured silver-cysteine complex (AgCys NWs) with a large number of -COOH, which was synthesized by AgNO3 and l-cysteine, was used as substrate of the immunosensor to capture the primary antibody (Ab1). Under the optimal conditions, this proposed ECL immunosensor had exhibited high sensitivity for Aβ detection with a wide linear range from 80 fg/mL to 100 ng/mL and an ultralow detection limit of 52 fg/mL. Meanwhile, this biosensor had good specificity for Aβ, indicating that the provided strategy had a promising potential in the detection of Aβ.
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Affiliation(s)
- Jing-Xi Wang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
| | - Ying Zhuo
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
| | - Ying Zhou
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
| | - Hai-Jun Wang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
| | - Ruo Yuan
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
| | - Ya-Qin Chai
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, PR China
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45
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Elias JS, Artrith N, Bugnet M, Giordano L, Botton GA, Kolpak AM, Shao-Horn Y. Elucidating the Nature of the Active Phase in Copper/Ceria Catalysts for CO Oxidation. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02666] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Matthieu Bugnet
- Department
of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
| | - Livia Giordano
- Dipartimento
di Scienza dei Materiali, Università di Milano-Bicocca, 20125 Milan, Italy
| | - Gianluigi A. Botton
- Department
of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
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46
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Oxidation-state sensitive imaging of cerium dioxide by atomic-resolution low-angle annular dark field scanning transmission electron microscopy. Ultramicroscopy 2016; 162:52-60. [PMID: 26744830 DOI: 10.1016/j.ultramic.2015.12.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 12/08/2015] [Accepted: 12/15/2015] [Indexed: 11/22/2022]
Abstract
Low-angle annular dark field (LAADF) scanning transmission electron microscopy (STEM) imaging is presented as a method that is sensitive to the oxidation state of cerium ions in CeO2 nanoparticles. This relationship was validated through electron energy loss spectroscopy (EELS), in situ measurements, as well as multislice image simulations. Static displacements caused by the increased ionic radius of Ce(3+) influence the electron channeling process and increase electron scattering to low angles while reducing scatter to high angles. This process manifests itself by reducing the high-angle annular dark field (HAADF) signal intensity while increasing the LAADF signal intensity in close proximity to Ce(3+) ions. This technique can supplement STEM-EELS and in so doing, relax the experimental challenges associated with acquiring oxidation state information at high spatial resolutions.
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47
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Queraltó A, de la Mata M, Martínez L, Magén C, Gibert M, Arbiol J, Hühne R, Obradors X, Puig T. Orientation symmetry breaking in self-assembled Ce1−xGdxO2−ynanowires derived from chemical solutions. RSC Adv 2016. [DOI: 10.1039/c6ra23717g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A novel approach to perform an independent study of the nucleation and coarsening of Ce0.9Gd0.1O2−ynanowires is presented.
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Affiliation(s)
- A. Queraltó
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
| | - M. de la Mata
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
- Institut Català de Nanociència i Nanotecnologia (ICN2)
- CSIC
| | - L. Martínez
- Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)
- Madrid
- Spain
| | - C. Magén
- Laboratorio de Microscopías Avanzadas (LMA)
- Instituto de Nanociencia de Aragón (INA) – ARAID
- Departamento de Física de la Materia Condensada
- Universidad de Zaragoza
- 50018 Zaragoza
| | - M. Gibert
- Département de Physique de la Matière Quantique
- University of Geneva
- 1211 Genève 4
- Switzerland
| | - J. Arbiol
- Institut Català de Nanociència i Nanotecnologia (ICN2)
- CSIC
- The Barcelona Institute of Science and Technology (BIST)
- 08193 Bellaterra
- Spain
| | - R. Hühne
- Institute for Metallic Materials
- IFW Dresden
- 01171 Dresden
- Germany
| | - X. Obradors
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
| | - T. Puig
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
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48
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Wang YJ, Dong H, Lyu GM, Zhang HY, Ke J, Kang LQ, Teng JL, Sun LD, Si R, Zhang J, Liu YJ, Zhang YW, Huang YH, Yan CH. Engineering the defect state and reducibility of ceria based nanoparticles for improved anti-oxidation performance. NANOSCALE 2015; 7:13981-90. [PMID: 26228305 DOI: 10.1039/c5nr02588e] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Due to their excellent anti-oxidation performance, CeO2 nanoparticles receive wide attention in pharmacological application. Deep understanding of the anti-oxidation mechanism of CeO2 nanoparticles is extremely important to develop potent CeO2 nanomaterials for anti-oxidation application. Here, we report a detailed study on the anti-oxidation process of CeO2 nanoparticles. The valence state and coordination structure of Ce are characterized before and after the addition of H2O2 to understand the anti-oxidation mechanism of CeO2 nanoparticles. Adsorbed peroxide species are detected during the anti-oxidation process, which are responsible for the red-shifted UV-vis absorption spectra of CeO2 nanoparticles. Furthermore, the coordination number of Ce in the first coordination shell slightly increased after the addition of H2O2. On the basis of these experimental results, the reactivity of coordination sites for peroxide species is considered to play a key role in the anti-oxidation performance of CeO2 nanoparticles. Furthermore, we present a robust method to engineer the anti-oxidation performance of CeO2 nanoparticles through the modification of the defect state and reducibility by doping with Gd(3+). Improved anti-oxidation performance is also observed in cell culture, where the biocompatible CeO2-based nanoparticles can protect INS-1 cells from oxidative stress induced by H2O2, suggesting the potential application of CeO2 nanoparticles in the treatment of diabetes.
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Affiliation(s)
- Yan-Jie Wang
- 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.
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49
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Lavkova J, Khalakhan I, Chundak M, Vorokhta M, Potin V, Matolin V, Matolinova I. Growth and composition of nanostructured and nanoporous cerium oxide thin films on a graphite foil. NANOSCALE 2015; 7:4038-4047. [PMID: 25652943 DOI: 10.1039/c4nr06550f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The morphology and composition of CeOx films prepared by r.f. magnetron sputtering on a graphite foil have been investigated mainly by using microscopy methods. This study presents the formation of nanocrystalline layers with porous structure due to the modification of a carbon support and the formation of cerium carbide crystallites as a result of the deposition process. Chemical analyses of the layers with different thicknesses performed by energy dispersive X-ray spectroscopy, electron energy loss spectroscopy and X-ray photoelectron spectroscopy have pointed to the reduction of the cerium oxide layers. In the deposited layers, cerium was present in mixed Ce(3+) and Ce(4+) valence. Ce(3+) species were located mainly at the graphite foil-CeOx interface and the chemical state of cerium was gradually changing to Ce(4+) going to the layer surface. It became more stoichiometric in the case of thicker layers except for the surface region, where the presence of Ce(3+) was associated with oxygen vacancies on the surface of cerium oxide grains. The degree of cerium oxide reduction is discussed in the context of particle size.
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Affiliation(s)
- Jaroslava Lavkova
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague 8, Czech Republic.
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50
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Meledina M, Turner S, Galvita VV, Poelman H, Marin GB, Van Tendeloo G. Local environment of Fe dopants in nanoscale Fe : CeO(2-x) oxygen storage material. NANOSCALE 2015; 7:3196-3204. [PMID: 25615558 DOI: 10.1039/c4nr06060a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Nanoscale Fe : CeO2-x oxygen storage material for the process of chemical looping has been investigated by advanced transmission electron microscopy and electron energy-loss spectroscopy before and after a model looping procedure, consisting of redox cycles at heightened temperature. Separately, the activity of the nanomaterial has been tested in a toluene total oxidation reaction. The results show that the material consists of ceria nanoparticles, doped with single Fe atoms and small FeOx clusters. The iron ion is partially present as Fe(3+) in a solid solution within the ceria lattice. Furthermore, enrichment of reduced Fe(2+) species is observed in nanovoids present in the ceria nanoparticles, as well as at the ceria surface. After chemical looping, agglomeration occurs and reduced nanoclusters appear at ceria grain boundaries formed by sintering. These clusters originate from surface Fe(2+) aggregation, and from bulk Fe(3+), which "leaks out" in reduced state after cycling to a slightly more agglomerated form. The activity of Fe : CeO2 during the toluene total oxidation part of the chemical looping cycle is ensured by the dopant Fe in the Fe1-xCexO2 solid solution, and by surface Fe species. These measurements on a model Fe : CeO2-x oxygen storage material give a unique insight into the behavior of dopants within a nanosized ceria host, and allow to interpret a plethora of (doped) cerium oxide-based reactions.
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Affiliation(s)
- M Meledina
- Electron Microscopy for Materials Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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