1
|
Wang J, Jiang Q, Liu D, Zhang L, Cai L, Zhu Y, Cao Z, Li W, Zhu X, Yang W. Effect of inner strain on the performance of dual-phase oxygen permeable membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.120142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
2
|
Sekhar PK, Moore Z, Aravamudhan S, Khosla A. A New Low-Temperature Electrochemical Hydrocarbon and NO x Sensor. SENSORS 2017; 17:s17122759. [PMID: 29186027 PMCID: PMC5750761 DOI: 10.3390/s17122759] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 11/14/2017] [Accepted: 11/27/2017] [Indexed: 11/26/2022]
Abstract
In this article, a new investigation on a low-temperature electrochemical hydrocarbon and NOx sensor is presented. Based on the mixed-potential-based sensing scheme, the sensor is constructed using platinum and metal oxide electrodes, along with an Yttria-Stabilized Zirconia (YSZ)/Strontium Titanate (SrTiO3) thin-film electrolyte. Unlike traditional mixed-potential sensors which operate at higher temperatures (>400 °C), this potentiometric sensor operates at 200 °C with dominant hydrocarbon (HC) and NOx response in the open-circuit and biased modes, respectively. The possible low-temperature operation of the sensor is speculated to be primarily due to the enhanced oxygen ion conductivity of the electrolyte, which may be attributed to the space charge effect, epitaxial strain, and atomic reconstruction at the interface of the YSZ/STO thin film. The response and recovery time for the NOx sensor are found to be 7 s and 8 s, respectively. The sensor exhibited stable response even after 120 days of testing, with an 11.4% decrease in HC response and a 3.3% decrease in NOx response.
Collapse
Affiliation(s)
- Praveen Kumar Sekhar
- Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, USA.
| | - Zachary Moore
- Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, USA.
| | - Shyam Aravamudhan
- Joint School of Nanoscience and Nanoengineering, North Carolina A & T State University, Greensboro, NC 27401, USA.
| | - Ajit Khosla
- Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan.
| |
Collapse
|
3
|
Pennycook TJ, Yang H, Jones L, Cabero M, Rivera-Calzada A, Leon C, Varela M, Santamaria J, Nellist PD. 3D elemental mapping with nanometer scale depth resolution via electron optical sectioning. Ultramicroscopy 2016; 174:27-34. [PMID: 28012372 DOI: 10.1016/j.ultramic.2016.12.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 11/23/2016] [Accepted: 12/02/2016] [Indexed: 10/20/2022]
Abstract
Electron energy loss spectroscopy in the scanning transmission electron microscope has long been used to perform elemental mapping but has not previously exhibited depth sensitivity. The key to depth resolution with optical sectioning is the transfer of sufficiently high lateral spatial frequencies. By performing spectrum imaging with atomic resolution we achieve nanometer scale depth resolution, enabling us to optically section an oxide heterostructure spectroscopically. Such 3D elemental mapping is sensitive to atomic scale changes in structure and composition and is more interpretable than Z-contrast imaging alone.
Collapse
Affiliation(s)
- Timothy J Pennycook
- EPSRC SuperSTEM Facility, Daresbury Laboratory, Warrington WA4 4AD, UK; Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
| | - Hao Yang
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
| | - Lewys Jones
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
| | - Mariona Cabero
- Grupo de Fisica de Materiales Complejos, Universidad Complutense, 28040 Madrid, Spain
| | | | - Carlos Leon
- Grupo de Fisica de Materiales Complejos, Universidad Complutense, 28040 Madrid, Spain
| | - Maria Varela
- Grupo de Fisica de Materiales Complejos, Universidad Complutense, 28040 Madrid, Spain; Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jacobo Santamaria
- Grupo de Fisica de Materiales Complejos, Universidad Complutense, 28040 Madrid, Spain
| | - Peter D Nellist
- EPSRC SuperSTEM Facility, Daresbury Laboratory, Warrington WA4 4AD, UK; Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
| |
Collapse
|
4
|
Su B, Guo W, Jiang L. Learning from nature: binary cooperative complementary nanomaterials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1072-96. [PMID: 25074551 DOI: 10.1002/smll.201401307] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 05/16/2023]
Abstract
In this Review, nature-inspired binary cooperative complementary nanomaterials (BCCNMs), consisting of two components with entirely opposite physiochemical properties at the nanoscale, are presented as a novel concept for the building of promising materials. Once the distance between the two nanoscopic components is comparable to the characteristic length of some physical interactions, the cooperation between these complementary building blocks becomes dominant and endows the macroscopic materials with novel and superior properties. The first implementation of the BCCNMs is the design of bio-inspired smart materials with superwettability and their reversible switching between different wetting states in response to various kinds of external stimuli. Coincidentally, recent studies on other types of functional nanomaterials contribute more examples to support the idea of BCCNMs, which suggests a potential yet comprehensive range of future applications in both materials science and engineering.
Collapse
Affiliation(s)
- Bin Su
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | | | | |
Collapse
|
5
|
Gómez-Pérez A, Prado-Gonjal J, Muñoz-Gil D, Andrada-Chacón A, Sánchez-Benítez J, Morán E, Azcondo MT, Amador U, Schmidt R. Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores. RSC Adv 2015. [DOI: 10.1039/c5ra07796f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work we report on the microwave assisted synthesis of nano-sized Gd2Ti2O7 (GTO) and Ho2Ti2O7 (HTO) powders from the RE2Ti2O7 pyrochlore family (RE = rare earth) and their physical properties.
Collapse
Affiliation(s)
| | - Jesús Prado-Gonjal
- Dpto. Química Inorgánica
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Daniel Muñoz-Gil
- Dpto. Química Inorgánica
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Adrián Andrada-Chacón
- Dpto. Química Física I
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Javier Sánchez-Benítez
- Dpto. Química Física I
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Emilio Morán
- Dpto. Química Inorgánica
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | | | - Ulises Amador
- Dpto. Química
- Facultad de Farmacia
- Universidad San Pablo – CEU
- Madrid
- Spain
| | - Rainer Schmidt
- Dpto. Física Aplicada III
- Facultad de CC. Físicas
- GFMC
- Universidad Complutense de Madrid
- 28040 Madrid
| |
Collapse
|
6
|
Aidhy DS, Zhang Y, Weber WJ. (001) SrTiO3 | (001) MgO interface and oxygen-vacancy stability from first-principles calculations. ACS APPLIED MATERIALS & INTERFACES 2014; 6:15536-15541. [PMID: 25137404 DOI: 10.1021/am504306t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In-depth understanding of interfacial atomistic structures is required to design heterointerfaces with controlled functionalities. Using density functional theory calculations, we investigate the interfacial structure of (001) SrTiO3 | (001) MgO, and characterize the stable interface structure. Among the four types of possible interface structures, we show that the TiO2-terminated SrTiO3 containing electrostatically attractive Mg-O and Ti-O ion-ion interactions forms the most stable interface. We also show that oxygen vacancies can be preferentially stabilized across the interface via manipulating interfacial strain. We elucidate that oxygen vacancies are most stable in the tensile-strain material, and unstable in compressive strain material. This stability is explained from equation-of-state analysis using a single crystal, where the oxygen vacancy shows a larger volume than the oxygen ion, thus explaining its stability under tensile-strained conditions.
Collapse
Affiliation(s)
- Dilpuneet S Aidhy
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | | | | |
Collapse
|
7
|
Sanchez-Santolino G, Cabero M, Varela M, Garcia-Barriocanal J, Leon C, Pennycook SJ, Santamaria J. Oxygen octahedral distortions in LaMO3/SrTiO3 superlattices. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2014; 20:825-831. [PMID: 24758834 DOI: 10.1017/s1431927614000750] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work we study the interfaces between the Mott insulator LaMnO3 (LMO) and the band insulator SrTiO3 (STO) in epitaxially grown superlattices with different thickness ratios and different transport and magnetic behaviors. Using atomic resolution electron energy-loss spectral imaging, we analyze simultaneously the structural and chemical properties of these interfaces. We find changes in the oxygen octahedral tilts within the LaMnO3 layers when the thickness ratio between the manganite and the titanate layers is varied. Superlattices with thick LMO and ultrathin STO layers present unexpected octahedral tilts in the STO, along with a small amount of oxygen vacancies. On the other hand, thick STO layers exhibit undistorted octahedra while the LMO layers present reduced O octahedral distortions near the interfaces. These findings are discussed in view of the transport and magnetic differences found in previous studies.
Collapse
Affiliation(s)
| | - Mariona Cabero
- 1GFMC,Departamento de Fisica Aplicada III,Universidad Complutense de Madrid,28040 Madrid,Spain
| | - Maria Varela
- 1GFMC,Departamento de Fisica Aplicada III,Universidad Complutense de Madrid,28040 Madrid,Spain
| | | | - Carlos Leon
- 1GFMC,Departamento de Fisica Aplicada III,Universidad Complutense de Madrid,28040 Madrid,Spain
| | - Stephen J Pennycook
- 4Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN 37996,USA
| | - Jacobo Santamaria
- 1GFMC,Departamento de Fisica Aplicada III,Universidad Complutense de Madrid,28040 Madrid,Spain
| |
Collapse
|
8
|
Chu P, Chen DP, Wang YL, Xie YL, Yan ZB, Wan JG, Liu JM, Li JY. Kinetics of 90° domain wall motions and high frequency mesoscopic dielectric response in strained ferroelectrics: a phase-field simulation. Sci Rep 2014; 4:5007. [PMID: 24845806 PMCID: PMC4028899 DOI: 10.1038/srep05007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 05/01/2014] [Indexed: 11/20/2022] Open
Abstract
The dielectric and ferroelectric behaviors of a ferroelectric are substantially determined by its domain structure and domain wall dynamics at mesoscopic level. A relationship between the domain walls and high frequency mesoscopic dielectric response is highly appreciated for high frequency applications of ferroelectrics. In this work we investigate the low electric field driven motion of 90°-domain walls and the frequency-domain spectrum of dielectric permittivity in normally strained ferroelectric lattice using the phase-field simulations. It is revealed that, the high-frequency dielectric permittivity is spatially inhomogeneous and reaches the highest value on the 90°-domain walls. A tensile strain favors the parallel domains but suppresses the kinetics of the 90° domain wall motion driven by electric field, while the compressive strain results in the opposite behaviors. The physics underlying the wall motions and thus the dielectric response is associated with the long-range elastic energy. The major contribution to the dielectric response is from the polarization fluctuations on the 90°-domain walls, which are more mobile than those inside the domains. The relevance of the simulated results wth recent experiments is discussed.
Collapse
Affiliation(s)
- P Chu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - D P Chen
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - Y L Wang
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - Y L Xie
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - Z B Yan
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - J G Wan
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - J-M Liu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - J Y Li
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
| |
Collapse
|
9
|
Bruno FY, Schmidt R, Varela M, Garcia-Barriocanal J, Rivera-Calzada A, Cuellar FA, Leon C, Thakur P, Cezar JC, Brookes NB, Garcia-Hernandez M, Dagotto E, Pennycook SJ, Santamaria J. Electron doping by charge transfer at LaFeO3/Sm2CuO4 epitaxial interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1468-1473. [PMID: 23292988 DOI: 10.1002/adma.201203483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 10/23/2012] [Indexed: 06/01/2023]
Abstract
Using X-ray absorption spectroscopy and electron energy loss spectroscopy with atomic-scale spatial resolution, experimental evidence for charge transfer at the interface between the Mott insulators Sm2 CuO4 and LaFeO3 is obtained. As a consequence of the charge transfer, the Sm2 CuO4 is doped with electrons and thus epitaxial Sm2 CuO4 /LaFeO3 heterostructures become metallic.
Collapse
Affiliation(s)
- Flavio Y Bruno
- GFMC, Departamento Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, Madrid, Spain.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Aydin H, Korte C, Rohnke M, Janek J. Oxygen tracer diffusion along interfaces of strained Y2O3/YSZ multilayers. Phys Chem Chem Phys 2013; 15:1944-55. [DOI: 10.1039/c2cp43231e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
11
|
Griggio F, Jesse S, Kumar A, Ovchinnikov O, Kim H, Jackson TN, Damjanovic D, Kalinin SV, Trolier-McKinstry S. Substrate clamping effects on irreversible domain wall dynamics in lead zirconate titanate thin films. PHYSICAL REVIEW LETTERS 2012; 108:157604. [PMID: 22587285 DOI: 10.1103/physrevlett.108.157604] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 02/14/2012] [Indexed: 05/31/2023]
Abstract
The role of long-range strain interactions on domain wall dynamics is explored through macroscopic and local measurements of nonlinear behavior in mechanically clamped and released polycrystalline lead zirconate-titanate (PZT) films. Released films show a dramatic change in the global dielectric nonlinearity and its frequency dependence as a function of mechanical clamping. Furthermore, we observe a transition from strong clustering of the nonlinear response for the clamped case to almost uniform nonlinearity for the released film. This behavior is ascribed to increased mobility of domain walls. These results suggest the dominant role of collective strain interactions mediated by the local and global mechanical boundary conditions on the domain wall dynamics. The work presented in this Letter demonstrates that measurements on clamped films may considerably underestimate the piezoelectric coefficients and coupling constants of released structures used in microelectromechanical systems, energy harvesting systems, and microrobots.
Collapse
Affiliation(s)
- F Griggio
- Materials Research Institute and Materials Science and Engineering Department, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | | | | | | | | | | | | | | | | |
Collapse
|