1
|
Acharya M, Banyas E, Ramesh M, Jiang Y, Fernandez A, Dasgupta A, Ling H, Hanrahan B, Persson K, Neaton JB, Martin LW. Exploring the Pb 1- x Sr x HfO 3 System and Potential for High Capacitive Energy Storage Density and Efficiency. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2105967. [PMID: 34599789 DOI: 10.1002/adma.202105967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 09/14/2021] [Indexed: 05/05/2023]
Abstract
The hafnate perovskites PbHfO3 (antiferroelectric) and SrHfO3 ("potential" ferroelectric) are studied as epitaxial thin films on SrTiO3 (001) substrates with the added opportunity of observing a morphotropic phase boundary (MPB) in the Pb1- x Srx HfO3 system. The resulting (240)-oriented PbHfO3 (Pba2) films exhibited antiferroelectric switching with a saturation polarization ≈53 µC cm-2 at 1.6 MV cm-1 , weak-field dielectric constant ≈186 at 298 K, and an antiferroelectric-to-paraelectric phase transition at ≈518 K. (002)-oriented SrHfO3 films exhibited neither ferroelectric behavior nor evidence of a polar P4mm phase . Instead, the SrHfO3 films exhibited a weak-field dielectric constant ≈25 at 298 K and no signs of a structural transition to a polar phase as a function of temperature (77-623 K) and electric field (-3 to 3 MV cm-1 ). While the lack of ferroelectric order in SrHfO3 removes the potential for MPB, structural and property evolution of the Pb1- x Srx HfO3 (0 ≤ x < 1) system is explored. Strontium alloying increased the electric-breakdown strength (EB ) and decreased hysteresis loss, thus enhancing the capacitive energy storage density (Ur ) and efficiency (η). The composition, Pb0.5 Sr0.5 HfO3 produced the best combination of EB = 5.12 ± 0.5 MV cm-1 , Ur = 77 ± 5 J cm-3 , and η = 97 ± 2%, well out-performing PbHfO3 and other antiferroelectric oxides.
Collapse
Affiliation(s)
- Megha Acharya
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Ella Banyas
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Maya Ramesh
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Yizhe Jiang
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Abel Fernandez
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Arvind Dasgupta
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Handong Ling
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
| | | | - Kristin Persson
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jeffrey B Neaton
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Department of Physics, University of California, Berkeley, Berkeley, CA, 94720, USA
- Kavli Energy Nanosciences Institute, University of California, Berkeley, CA, 94720, USA
| | - Lane W Martin
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| |
Collapse
|
2
|
Kadim EJ, Noorden ZA, Adzis Z, Azis N. Nanoparticles Application in High Voltage Insulation Systems. IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2021; 28:1380-1399. [DOI: 10.1109/tdei.2021.009531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
3
|
High-k Polymer Nanocomposite Materials for Technological Applications. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10124249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Understanding the properties of small molecules or monomers is decidedly important. The efforts of synthetic chemists and material engineers must be appreciated because of their knowledge of how utilize the properties of synthetic fragments in constructing long-chain macromolecules. Scientists active in this area of macromolecular science have shared their knowledge of catalysts, monomers and a variety of designed nanoparticles in synthetic techniques that create all sorts of nanocomposite polymer stuffs. Such materials are now an integral part of the contemporary world. Polymer nanocomposites with high dielectric constant (high-k) properties are widely applicable in the technological sectors including gate dielectrics, actuators, infrared detectors, tunable capacitors, electro optic devices, organic field-effect transistors (OFETs), and sensors. In this short colloquy, we provided an overview of a few remarkable high-k polymer nanocomposites of material science interest from recent decades.
Collapse
|
4
|
Impact of the absolute rutile fraction on TiO2 visible-light absorption and visible-light-promoted photocatalytic activity. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.111940] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
5
|
Hennous M, Ramana EV, Tobaldi DM, Costa BFO, Valente MA, Labrincha J, Karmaoui M. Synthesis, structure and magnetic properties of multipod-shaped cobalt ferrite nanocrystals. NEW J CHEM 2019. [DOI: 10.1039/c9nj02237f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A non-aqueous sol–gel route followed by oriented attachment to make multi-pod CoFe2O4 nanocrystals showing large room temperature saturation magnetization.
Collapse
Affiliation(s)
- Mohammed Hennous
- Laboratoire de Physico-Chimie des Matériaux
- Catalyse et Environnement Département de Génie Chimique
- Faculté de Chimie
- Université des Sciences et de la Technologie d'Oran – Mohamed Boudiaf
- Oran 31000
| | - E. Venkata Ramana
- I3N-Aveiro
- Department of Physics
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | - David M. Tobaldi
- Department of Materials and Ceramic Engineering/CICECO – Aveiro Institute of Materials
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
- Portugal
| | | | - M. A. Valente
- I3N-Aveiro
- Department of Physics
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | - Joao Labrincha
- Department of Materials and Ceramic Engineering/CICECO – Aveiro Institute of Materials
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
- Portugal
| | - Mohamed Karmaoui
- Laboratoire de Physico-Chimie des Matériaux
- Catalyse et Environnement Département de Génie Chimique
- Faculté de Chimie
- Université des Sciences et de la Technologie d'Oran – Mohamed Boudiaf
- Oran 31000
| |
Collapse
|
6
|
Karmaoui M, Jorge AB, McMillan PF, Aliev AE, Pullar RC, Labrincha JA, Tobaldi DM. One-Step Synthesis, Structure, and Band Gap Properties of SnO 2 Nanoparticles Made by a Low Temperature Nonaqueous Sol-Gel Technique. ACS OMEGA 2018; 3:13227-13238. [PMID: 31458041 PMCID: PMC6644347 DOI: 10.1021/acsomega.8b02122] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 10/01/2018] [Indexed: 05/22/2023]
Abstract
Because of its electrically conducting properties combined with excellent thermal stability and transparency throughout the visible spectrum, tin oxide (SnO2) is extremely attractive as a transparent conducting material for applications in low-emission window coatings and solar cells, as well as in lithium-ion batteries and gas sensors. It is also an important catalyst and catalyst support for oxidation reactions. Here, we describe a novel nonaqueous sol-gel synthesis approach to produce tin oxide nanoparticles (NPs) with a low NP size dispersion. The success of this method lies in the nonhydrolytic pathway that involves the reaction between tin chloride and an oxygen donor, 1-hexanol, without the need for a surfactant or subsequent thermal treatment. This one-pot procedure is carried out at relatively low temperatures in the 160-260 °C range, compatible with coating processes on flexible plastic supports. The NP size distribution, shape, and dislocation density were studied by powder X-ray powder diffraction analyzed using the method of whole powder pattern modeling, as well as high-resolution transmission electron microscopy. The SnO2 NPs were determined to have particle sizes between 3.4 and 7.7 nm. The reaction products were characterized using liquid-state 13C and 1H nuclear magnetic resonance (NMR) that confirmed the formation of dihexyl ether and 1-chlorohexane. The NPs were studied by a combination of 13C, 1H, and 119Sn solid-state NMR as well as Fourier transform infrared (FTIR) and Raman spectroscopy. The 13C SSNMR, FTIR, and Raman data showed the presence of organic species derived from the 1-hexanol reactant remaining within the samples. The optical absorption, studied using UV-visible spectroscopy, indicated that the band gap (E g) shifted systematically to lower energy with decreasing NP sizes. This unusual result could be due to mechanical strains present within the smallest NPs perhaps associated with the organic ligands decorating the NP surface. As the size increased, we observed a correlation with an increased density of screw dislocations present within the NPs that could indicate relaxation of the stress. We suggest that this could provide a useful method for band gap control within SnO2 NPs in the absence of chemical dopants.
Collapse
Affiliation(s)
- Mohamed Karmaoui
- Department
of Materials and Ceramic Engineering/CICECO—Aveiro Institute
of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- Département
de Génie Chimique, Faculté de Chimie, Université des Sciences et de la technologie Mohamed-Boudiaf
El Mnaouar, BP 1505, Bir El Djir, 31000 Oran, Algeria
- E-mail: , , (M.K.)
| | - Ana Belen Jorge
- Materials
Research Institute, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS London, U.K.
| | - Paul F. McMillan
- University
College London, Christopher Ingold Building, 20 Gordon Street, WC1H 0AJ London, U.K.
| | - Abil E. Aliev
- University
College London, Christopher Ingold Building, 20 Gordon Street, WC1H 0AJ London, U.K.
| | - Robert C. Pullar
- Department
of Materials and Ceramic Engineering/CICECO—Aveiro Institute
of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - João António Labrincha
- Department
of Materials and Ceramic Engineering/CICECO—Aveiro Institute
of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - David Maria Tobaldi
- Department
of Materials and Ceramic Engineering/CICECO—Aveiro Institute
of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- E-mail: , (D.M.T.)
| |
Collapse
|
7
|
Smith PF, Brady AB, Lee SY, Bruck AM, Dooryhee E, Wu L, Zhu Y, Takeuchi KJ, Takeuchi ES, Marschilok AC. Deliberately Designed Atomic-Level Silver-Containing Interface Results in Improved Rate Capability and Utilization of Silver Hollandite for Lithium-Ion Storage. ACS APPLIED MATERIALS & INTERFACES 2018; 10:400-407. [PMID: 29227624 DOI: 10.1021/acsami.7b12307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
α-MnO2-structured materials are generally classified as semiconductors; thus, we present a strategy to increase electrochemical utilization through the design of a conductive material interface. Surface treatment of silver hollandite (AgxMn8O16) with Ag+ (Ag2O) provides significant benefits to the resultant electrochemistry, including a decreased charge-transfer resistance and a 2-fold increase in deliverable energy density at a high rate. The improved function of this designed interface relative to conventional electrode fabrication strategies is highlighted.
Collapse
Affiliation(s)
- Paul F Smith
- Department of Chemistry, Stony Brook University , John S. Toll Rd, Stony Brook, New York 11794, United States
| | - Alexander B Brady
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | | | - Andrea M Bruck
- Department of Chemistry, Stony Brook University , John S. Toll Rd, Stony Brook, New York 11794, United States
| | | | | | | | - Kenneth J Takeuchi
- Department of Chemistry, Stony Brook University , John S. Toll Rd, Stony Brook, New York 11794, United States
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | - Esther S Takeuchi
- Department of Chemistry, Stony Brook University , John S. Toll Rd, Stony Brook, New York 11794, United States
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | - Amy C Marschilok
- Department of Chemistry, Stony Brook University , John S. Toll Rd, Stony Brook, New York 11794, United States
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| |
Collapse
|
8
|
Cheng J, Nazir S, Yang K. First-Principles Prediction of Two-Dimensional Electron Gas Driven by Polarization Discontinuity in Nonpolar/Nonpolar AHfO 3/SrTiO 3 (A = Ca, Sr, and Ba) Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31959-31967. [PMID: 27800684 DOI: 10.1021/acsami.6b06907] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
By using first-principles electronic structure calculations, we explored the possibility of producing two-dimensional electron gas (2DEG) in nonpolar/nonpolar AHfO3/SrTiO3 (A = Ca, Sr, and Ba) heterostructures. Two types of nonpolar/nonpolar interfaces, (AO)0/(TiO2)0 and (HfO2)0/(SrO)0, each with AO and HfO2 surface terminations, are modeled, respectively. The polarization domain and resulting interfacial electronic property are found to be more sensitive to the surface termination of the film rather than the interface model. As film thickness increases, an insulator-to-metal transition is found in all the heterostructures with HfO2 surface termination: for (AO)0/(TiO2)0 interfaces, predicted critical film thickness for an insulator-to-metal transition is about 7, 6, and 3 unit cells for CaHfO3/SrTiO3, SrHfO3/SrTiO3, and BaHfO3/SrTiO3, respectively; for (HfO2)0/(SrO)0 interfaces, the critical film thickness is about 7.5, 5.5, and 4.5 unit cells, respectively. In contrast, for the heterostructures with AO surface termination, CaHfO3/SrTiO3 exhibits a much larger critical film thickness about 11-12 unit cells for an insulator-to-metal transition; while SrHfO3/SrTiO3 and BaHfO3/SrTiO3 do not show any polarization behavior even film thickness increases up to 20 unit cells. The strain-induced polarization behavior was well-elucidated from energy versus polarization profile. This work is expected to stimulate further experimental investigation to the interfacial conductivity in the nonpolar/nonpolar AHfO3/SrTiO3 HS.
Collapse
Affiliation(s)
- Jianli Cheng
- Department of NanoEngineering, University of California, San Diego , 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093-0448, United States
| | - Safdar Nazir
- Department of NanoEngineering, University of California, San Diego , 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093-0448, United States
| | - Kesong Yang
- Department of NanoEngineering, University of California, San Diego , 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093-0448, United States
| |
Collapse
|
9
|
Karmaoui M, Amaral JS, Lajaunie L, Puliyalil H, Tobaldi DM, Pullar RC, Labrincha JA, Arenal R, Cvelbar U. Smallest Bimetallic CoPt 3 Superparamagnetic Nanoparticles. J Phys Chem Lett 2016; 7:4039-4046. [PMID: 27676169 DOI: 10.1021/acs.jpclett.6b01768] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present for the first time a nonaqueous sol-gel route to produce ultrasmall (<2 nm) magnetic bimetallic CoPt3 nanoparticles (NPs). The one-pot procedure is carried out at low temperature (180 °C) using benzyl alcohol, acting as both reducing agent and solvent. The highly monodisperse CoPt3 NPs were investigated with innovative advanced X-ray methods (whole powder pattern modeling), HR-STEM, XPS, and SQUID magnetometry. XPS showed Co was mostly in metallic form, but with a very small amount of CoO on the NP surface. The spherical NPs had an ultrasmall diameter of 1.6 nm and could self-assemble in aligned linear chains, or nanobelts, of single NPs. They are superparamagnetic, with blocking temperature of ∼20 K and coercivity at 10 K of 27.9 kA m-1 (∼350 Oe). However, there is evidence of a second magnetic phase (probably CoO) in the ZFC magnetization curve, which enhances their magnetization values, without significantly affecting their superparamagnetism.
Collapse
Affiliation(s)
- Mohamed Karmaoui
- School of Chemistry-College of Engineering and Physical Sciences, University of Birmingham Edgbaston , Birmingham B15 2TT, United Kingdom
| | - J S Amaral
- Department of Physics/CICECO - Aveiro Institute of Materials, University of Aveiro , Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Luc Lajaunie
- Laboratorio de Microscopías Avanzadas, Instituto de Nanociencia de Aragón, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Harinarayanan Puliyalil
- Department F4, Jozef Stefan Institute , Jamova cesta 39, Ljubljana 1000, Slovenia
- Jozef Stefan international Postgraduate School , Jamova cesta 39, Ljubljana 1000, Slovenia
| | - David M Tobaldi
- Department of Materials and Ceramic Engineering/CICECO - Aveiro Institute of Materials, University of Aveiro , Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Robert C Pullar
- Department of Materials and Ceramic Engineering/CICECO - Aveiro Institute of Materials, University of Aveiro , Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- Department of Materials, Imperial College London , London SW7 2AZ, United Kingdom
| | - João A Labrincha
- Department of Materials and Ceramic Engineering/CICECO - Aveiro Institute of Materials, University of Aveiro , Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Raul Arenal
- Laboratorio de Microscopías Avanzadas, Instituto de Nanociencia de Aragón, Universidad de Zaragoza , 50018 Zaragoza, Spain
- ARAID Foundation , 50018 Zaragoza, Spain
| | - Uroš Cvelbar
- Department F4, Jozef Stefan Institute , Jamova cesta 39, Ljubljana 1000, Slovenia
- Jozef Stefan international Postgraduate School , Jamova cesta 39, Ljubljana 1000, Slovenia
| |
Collapse
|