1
|
Bidoul N, Roisin N, Flandre D. Tuning the Intrinsic Stochasticity of Resistive Switching in VO 2 Microresistors. NANO LETTERS 2024; 24:6201-6209. [PMID: 38757925 DOI: 10.1021/acs.nanolett.4c00184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Vanadium dioxide (VO2) microresistors exhibit resistive switching above a certain threshold voltage, allowing them to emulate neurons in neuromorphic systems. However, such devices present intrinsic cycle-to-cycle variations in their resistances and threshold voltages, which can be detrimental or beneficial, depending on their use. Here, we study this stochasticity in VO2 microresistors with various grain sizes and dimensions, through high-resolution electrical and optical measurements across numerous cycles. Our results highlight that the cycle-to-cycle variations in threshold voltage increase as the grain size becomes comparable to the device dimensions. We also present observations of multimodal threshold voltage distributions in the smaller-length resistors. To understand the underlying phenomenon, we investigate the relationship between the device insulating resistance and threshold voltage distributions, showing that these modes could correspond to distinct percolation paths and filaments. Our findings provide the first experimentally verified guidelines for designing VO2 devices with minimized/maximized stochasticity, depending on the targeted application.
Collapse
Affiliation(s)
- Noémie Bidoul
- Institute for Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), UCLouvain, Louvain-la-Neuve 1348, Belgium
| | - Nicolas Roisin
- Institute for Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), UCLouvain, Louvain-la-Neuve 1348, Belgium
| | - Denis Flandre
- Institute for Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), UCLouvain, Louvain-la-Neuve 1348, Belgium
| |
Collapse
|
2
|
Yang G, Yang S, Sun J, Duan G, Cao B, Liu Z. W-doped VO 2 for high-performance aqueous Zn-ion batteries. Phys Chem Chem Phys 2023; 25:25435-25441. [PMID: 37706505 DOI: 10.1039/d3cp03006g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Aqueous Zn-ion batteries (AZIBs) have become one of the most promising energy storage devices due to their high safety and low cost. However, the development of stable cathodes with fast kinetics and high energy density is the key to achieving large-scale application of AZIBs. In this work, W-doped VO2 (W-VO2) is developed by a one-step hydrothermal method. Benefiting from the pre-insertion of W6+ and the introduction of the W-O bond, accomplishing an expanded lattice spacing and a stable structure, both improved kinetics and long cycle life are achieved. The W-VO2 delivers a specific capacity of 340.2 mA h g-1 at 0.2 A g-1, an excellent high-rate capability with a discharge capacity of 186.9 mA h g-1 at 10 A g-1, and long-term cycling stability with a capacity retention of 76.5% after 2000 cycles. The electrochemical performance of the W-VO2 has been greatly improved, compared with the pure VO2. The W doping strategy proposed here also presents an encouraging pathway for developing other high-energy and stable cathodes.
Collapse
Affiliation(s)
- Guangxu Yang
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| | - Shuhua Yang
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| | - Jinfeng Sun
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| | - Guangbin Duan
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| | - Bingqiang Cao
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| | - Zongming Liu
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
| |
Collapse
|
3
|
Brown TD, Bohaichuk SM, Islam M, Kumar S, Pop E, Williams RS. Electro-Thermal Characterization of Dynamical VO 2 Memristors via Local Activity Modeling. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2205451. [PMID: 36165218 DOI: 10.1002/adma.202205451] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/23/2022] [Indexed: 06/16/2023]
Abstract
Translating the surging interest in neuromorphic electronic components, such as those based on nonlinearities near Mott transitions, into large-scale commercial deployment faces steep challenges in the current lack of means to identify and design key material parameters. These issues are exemplified by the difficulties in connecting measurable material properties to device behavior via circuit element models. Here, the principle of local activity is used to build a model of VO2 /SiN Mott threshold switches by sequentially accounting for constraints from a minimal set of quasistatic and dynamic electrical and high-spatial-resolution thermal data obtained via in situ thermoreflectance mapping. By combining independent data sets for devices with varying dimensions, the model is distilled to measurable material properties, and device scaling laws are established. The model can accurately predict electrical and thermal conductivities and capacitances and locally active dynamics (especially persistent spiking self-oscillations). The systematic procedure by which this model is developed has been a missing link in predictively connecting neuromorphic device behavior with their underlying material properties, and should enable rapid screening of material candidates before employing expensive manufacturing processes and testing procedures.
Collapse
Affiliation(s)
- Timothy D Brown
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
- Sandia National Laboratories, Livermore, CA, 94550, USA
| | | | - Mahnaz Islam
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Suhas Kumar
- Sandia National Laboratories, Livermore, CA, 94550, USA
| | - Eric Pop
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - R Stanley Williams
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
| |
Collapse
|
4
|
Kaydashev V, Slavich A, Domaratskiy I, Zhukov S, Kirtaev R, Mylnikov D, Alymov G, Kutepov M, Kaidashev E. Reconfigurable VO 2 metasurfaces with hybrid electro-optical control: manipulating THz radiation with 0.3 W/cm 2 light. APPLIED OPTICS 2023; 62:4942-4948. [PMID: 37707272 DOI: 10.1364/ao.490081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 05/24/2023] [Indexed: 09/15/2023]
Abstract
Dynamicallyprogrammable metasurfaces capable of manipulating terahertz (THz) wavefronts in various manners depending on external controls are highly desired for next-generation wireless communication systems and new tools for THz diagnostics. Such metasurfaces may utilize the insulator-to-metal transition in V O 2, which can be induced both electrically and optically. Optical control is especially convenient for individual addressing to each meta-atom, but it is hampered by the high optical switching threshold of V O 2. We experimentally realize V O 2-based THz metasurfaces with hybrid electro-optical control when the metasurface is brought close to the transition point by an almost-threshold current, and then is easily switched by unfocused continuous-wave light. We were able to control the metasurface THz transmission by 0.4W/c m 2 near-IR light, while purely optical switching required tightly focused light with an intensity of >3×105 W/c m 2. After correcting for the fact that a tightly focused spot dissipates heat easier, we estimate that the optical switching threshold reduction due to the electric current alone is ∼2 orders of magnitude. Finally, coating the metasurface with Au nanoparticles further reduced the threshold by 30% due to plasmonic effects.
Collapse
|
5
|
Basyooni MA, Al-Dossari M, Zaki SE, Eker YR, Yilmaz M, Shaban M. Tuning the Metal-Insulator Transition Properties of VO 2 Thin Films with the Synergetic Combination of Oxygen Vacancies, Strain Engineering, and Tungsten Doping. NANOMATERIALS 2022; 12:nano12091470. [PMID: 35564181 PMCID: PMC9099983 DOI: 10.3390/nano12091470] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 04/20/2022] [Accepted: 04/20/2022] [Indexed: 02/01/2023]
Abstract
Vanadium oxide (VO2) is considered a Peierls–Mott insulator with a metal–insulator transition (MIT) at Tc = 68° C. The tuning of MIT parameters is a crucial point to use VO2 within thermoelectric, electrochromic, or thermochromic applications. In this study, the effect of oxygen deficiencies, strain engineering, and metal tungsten doping are combined to tune the MIT with a low phase transition of 20 °C in the air without capsulation. Narrow hysteresis phase transition devices based on multilayer VO2, WO3, Mo0.2W0.8O3, and/or MoO3 oxide thin films deposited through a high vacuum sputtering are investigated. The deposited films are structurally, chemically, electrically, and optically characterized. Different conductivity behaviour was observed, with the highest value towards VO1.75/WO2.94 and the lowest VO1.75 on FTO glass. VO1.75/WO2.94 showed a narrow hysteresis curve with a single-phase transition. Thanks to the role of oxygen vacancies, the MIT temperature decreased to 35 °C, while the lowest value (Tc = 20 °C) was reached with Mo0.2W0.8O3/VO2/MoO3 structure. In this former sample, Mo0.2W0.8O3 was used for the first time as an anti-reflective and anti-oxidative layer. The results showed that the MoO3 bottom layer is more suitable than WO3 to enhance the electrical properties of VO2 thin films. This work is applied to fast phase transition devices.
Collapse
Affiliation(s)
- Mohamed A. Basyooni
- Department of Nanotechnology and Advanced Materials, Graduate School of Applied and Natural Science, Selçuk University, Konya 42030, Turkey; (M.A.B.); (S.E.Z.)
- Department of Nanoscience and Nanoengineering, Institute of Science and Technology, University of Necmettin Erbakan, Konya 42060, Turkey;
- Science and Technology Research and Application Center (BITAM), University of Necmettin Erbakan, Konya 42060, Turkey
| | - Mawaheb Al-Dossari
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, Saudi Arabia;
- Department of Physics, Dhahran Aljanoub, King Khalid University, Abha 61421, Saudi Arabia
| | - Shrouk E. Zaki
- Department of Nanotechnology and Advanced Materials, Graduate School of Applied and Natural Science, Selçuk University, Konya 42030, Turkey; (M.A.B.); (S.E.Z.)
- Science and Technology Research and Application Center (BITAM), University of Necmettin Erbakan, Konya 42060, Turkey
| | - Yasin Ramazan Eker
- Science and Technology Research and Application Center (BITAM), University of Necmettin Erbakan, Konya 42060, Turkey
- Department of Metallurgy and Material Engineering, Faculty of Engineering and Architecture, Necmettin Erbakan University, Konya 42060, Turkey
- Correspondence: (Y.R.E.); (M.S.)
| | - Mucahit Yilmaz
- Department of Nanoscience and Nanoengineering, Institute of Science and Technology, University of Necmettin Erbakan, Konya 42060, Turkey;
| | - Mohamed Shaban
- Department of Physics, Faculty of Science, Islamic University of Madinah, AlMadinah Almonawara 42351, Saudi Arabia
- Nanophotonics and Applications Laboratory, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt
- Correspondence: (Y.R.E.); (M.S.)
| |
Collapse
|
6
|
Stress-Induced In Situ Modification of Transition Temperature in VO 2 Films Capped by Chalcogenide. MATERIALS 2020; 13:ma13235541. [PMID: 33291745 PMCID: PMC7729558 DOI: 10.3390/ma13235541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/29/2020] [Accepted: 12/01/2020] [Indexed: 11/16/2022]
Abstract
We attempted to modify the monoclinic–rutile structural phase transition temperature (Ttr) of a VO2 thin film in situ through stress caused by amorphous–crystalline phase change of a chalcogenide layer on it. VO2 films on C- or R-plane Al2O3 substrates were capped by Ge2Sb2Te5 (GST) films by means of rf magnetron sputtering. Ttr of the VO2 layer was evaluated through temperature-controlled measurements of optical reflection intensity and electrical resistance. Crystallization of the GST capping layer was accompanied by a significant drop in Ttr of the VO2 layer underneath, either with or without a SiNx diffusion barrier layer between the two. The shift of Ttr was by ~30 °C for a GST/VO2 bilayered sample with thicknesses of 200/30 nm, and was by ~6 °C for a GST/SiNx/VO2 trilayered sample of 200/10/6 nm. The lowering of Ttr was most probably caused by the volume reduction in GST during the amorphous–crystalline phase change. The stress-induced in in situ modification of Ttr in VO2 films could pave the way for the application of nonvolatile changes of optical properties in optoelectronic devices.
Collapse
|
7
|
Basyooni MA, Zaki SE, Shaban M, Eker YR, Yilmaz M. Efficient MoWO 3/VO 2/MoS 2/Si UV Schottky photodetectors; MoS 2 optimization and monoclinic VO 2 surface modifications. Sci Rep 2020; 10:15926. [PMID: 32985575 PMCID: PMC7522211 DOI: 10.1038/s41598-020-72990-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/09/2020] [Indexed: 11/21/2022] Open
Abstract
The distinctive properties of strongly correlated oxides provide a variety of possibilities for modulating the properties of 2D transition metal dichalcogenides semiconductors; which represent a new class of superior optical and optoelectronic interfacing semiconductors. We report a novel approach to scaling-up molybdenum disulfide (MoS2) by combining the techniques of chemical and physical vapor deposition (CVD and PVD) and interfacing with a thin layer of monoclinic VO2. MoWO3/VO2/MoS2 photodetectors were manufactured at different sputtering times by depositing molybdenum oxide layers using a PVD technique on p-type silicon substrates followed by a sulphurization process in the CVD chamber. The high quality and the excellent structural and absorption properties of MoWO3/VO2/MoS2/Si with MoS2 deposited for 60 s enables its use as an efficient UV photodetector. The electronically coupled monoclinic VO2 layer on MoS2/Si causes a redshift and intensive MoS2 Raman peaks. Interestingly, the incorporation of VO2 dramatically changes the ratio between A-exciton (ground state exciton) and trion photoluminescence intensities of VO2/(30 s)MoS2/Si from < 1 to > 1. By increasing the deposition time of MoS2 from 60 to 180 s, the relative intensity of the B-exciton/A-exciton increases, whereas the lowest ratio at deposition time of 60 s refers to the high quality and low defect densities of the VO2/(60 s)MoS2/Si structure. Both the VO2/(60 s)MoS2/Si trion and A-exciton peaks have higher intensities compared with (60 s) MoS2/Si structure. The MoWO3/VO2/(60 s)MoS2/Si photodetector displays the highest photocurrent gain of 1.6, 4.32 × 108 Jones detectivity, and ~ 1.0 × 1010 quantum efficiency at 365 nm. Moreover, the surface roughness and grains mapping are studied and a low semiconducting-metallic phase transition is observed at ~ 40 °C.
Collapse
Affiliation(s)
- Mohamed A Basyooni
- Nanophysics Laboratory, Department of NanoScience and NanoEngineering, Institute of Science and Technology, University of Necmettin Erbakan, Konya, 42060, Turkey
- Science and Technology Research and Application Center (BITAM), University of Necmettin Erbakan, Konya, 42060, Turkey
| | - Shrouk E Zaki
- Nanophysics Laboratory, Department of NanoScience and NanoEngineering, Institute of Science and Technology, University of Necmettin Erbakan, Konya, 42060, Turkey
| | - Mohamed Shaban
- Nanophotonics and Applications Laboratory, Department of Physics, Faculty of Science, Beni-Suef University, Beni Suef, 62514, Egypt.
- Department of Physics, Faculty of Science, Islamic University in Almadinah Almonawara, Almadinah Almonawara, 42351, Saudi Arabia.
| | - Yasin Ramazan Eker
- Department of Metallurgy and Material Engineering, Faculty of Engineering and Architecture, Necmettin Erbakan University, Konya, 42060, Turkey
- Science and Technology Research and Application Center (BITAM), University of Necmettin Erbakan, Konya, 42060, Turkey
| | - Mucahit Yilmaz
- Nanophysics Laboratory, Department of NanoScience and NanoEngineering, Institute of Science and Technology, University of Necmettin Erbakan, Konya, 42060, Turkey
| |
Collapse
|
8
|
Petel BE, Matson EM. Physicochemical Factors That Influence the Deoxygenation of Oxyanions in Atomically Precise, Oxygen-Deficient Vanadium Oxide Assemblies. Inorg Chem 2020; 60:6855-6864. [DOI: 10.1021/acs.inorgchem.0c02052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Brittney E. Petel
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Ellen M. Matson
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| |
Collapse
|
9
|
Park Y, Sim H, Jo M, Kim GY, Yoon D, Han H, Kim Y, Song K, Lee D, Choi SY, Son J. Directional ionic transport across the oxide interface enables low-temperature epitaxy of rutile TiO 2. Nat Commun 2020; 11:1401. [PMID: 32179741 PMCID: PMC7076001 DOI: 10.1038/s41467-020-15142-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 02/19/2020] [Indexed: 11/23/2022] Open
Abstract
Heterogeneous interfaces exhibit the unique phenomena by the redistribution of charged species to equilibrate the chemical potentials. Despite recent studies on the electronic charge accumulation across chemically inert interfaces, the systematic research to investigate massive reconfiguration of charged ions has been limited in heterostructures with chemically reacting interfaces so far. Here, we demonstrate that a chemical potential mismatch controls oxygen ionic transport across TiO2/VO2 interfaces, and that this directional transport unprecedentedly stabilizes high-quality rutile TiO2 epitaxial films at the lowest temperature (≤ 150 °C) ever reported, at which rutile phase is difficult to be crystallized. Comprehensive characterizations reveal that this unconventional low-temperature epitaxy of rutile TiO2 phase is achieved by lowering the activation barrier by increasing the “effective” oxygen pressure through a facile ionic pathway from VO2-δ sacrificial templates. This discovery shows a robust control of defect-induced properties at oxide interfaces by the mismatch of thermodynamic driving force, and also suggests a strategy to overcome a kinetic barrier to phase stabilization at exceptionally low temperature. The research to utilize chemical potential mismatch for materials synthesis has been limited across the oxide interface. Here, the authors show that directional ionic transport from the VO2 layers stabilizes the rutile TiO2 phase at extremely low temperatures, at which epitaxy is difficult, by effectively lowering the activation barrier for crystallization.
Collapse
Affiliation(s)
- Yunkyu Park
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hyeji Sim
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Minguk Jo
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Gi-Yeop Kim
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Daseob Yoon
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hyeon Han
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.,Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale), 06120, Germany
| | - Younghak Kim
- Pohang Accelerator Laboratory, Pohang, 37673, Republic of Korea
| | - Kyung Song
- Materials Modeling and Characterization Department, Korea Institute of Materials Science (KIMS), Changwon, Republic of Korea
| | - Donghwa Lee
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Junwoo Son
- Department of Materials Science and Engineering (MSE), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
| |
Collapse
|
10
|
Tadeo IJ, Mukhokosi EP, Krupanidhi SB, Umarji AM. Low-cost VO 2(M1) thin films synthesized by ultrasonic nebulized spray pyrolysis of an aqueous combustion mixture for IR photodetection. RSC Adv 2019; 9:9983-9992. [PMID: 35520889 PMCID: PMC9062365 DOI: 10.1039/c9ra00189a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 02/27/2019] [Indexed: 01/13/2023] Open
Abstract
We report detailed structural, electrical transport and IR photoresponse properties of large area VO2(M1) thin films deposited by a simple cost-effective two-step technique. Phase purity was confirmed by XRD and Raman spectroscopy studies. The high quality of the films was further established by a phase change from low temperature monoclinic phase to high temperature tetragonal rutile phase at 68 °C from temperature dependent Raman studies. An optical band gap of 0.75 eV was estimated from UV-visible spectroscopy. FTIR studies showed 60% reflectance change at λ = 7.7 μm from low reflectivity at low temperature to high reflectivity at high temperature in a transition temperature of 68 °C. Electrical characterization showed a first order transition of the films with a resistance change of four orders of magnitude and TCR of -3.3% K-1 at 30 °C. Hall-effect measurements revealed the n-type nature of VO2 thin films with room temperature Hall mobility, μ e of 0.097 cm2 V-1 s-1, conductivity, σ of 0.102 Ω-1 cm-1 and carrier concentration, n e = 5.36 × 1017 cm-3. In addition, we fabricated a high photoresponsive IR photodetector based on VO2(M1) thin films with excellent stability and reproducibility in ambient conditions using a low-cost method. The VO2(M1) photodetector exhibited high sensitivity, responsivity, quantum efficiency, detectivity and photoconductive gain of 5.18%, 1.54 mA W-1, 0.18%, 3.53 × 1010 jones and 9.99 × 103 respectively upon illumination with a 1064 nm laser at a power density of 200 mW cm-2 and 10 V bias voltage at room temperature.
Collapse
Affiliation(s)
- Inyalot Jude Tadeo
- Materials Research Centre, Indian Institute of Science Bengaluru 560012 India +91-80-23607316 +91-80-22932944
| | - Emma P Mukhokosi
- Materials Research Centre, Indian Institute of Science Bengaluru 560012 India +91-80-23607316 +91-80-22932944
| | - Saluru B Krupanidhi
- Materials Research Centre, Indian Institute of Science Bengaluru 560012 India +91-80-23607316 +91-80-22932944
| | - Arun M Umarji
- Materials Research Centre, Indian Institute of Science Bengaluru 560012 India +91-80-23607316 +91-80-22932944
| |
Collapse
|
11
|
Guo D, Ling C, Wang C, Wang D, Li J, Zhao Z, Wang Z, Zhao Y, Zhang J, Jin H. Hydrothermal One-Step Synthesis of Highly Dispersed M-Phase VO 2 Nanocrystals and Application to Flexible Thermochromic Film. ACS APPLIED MATERIALS & INTERFACES 2018; 10:28627-28634. [PMID: 30062879 DOI: 10.1021/acsami.8b08908] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Preparation of ultrafine highly dispersed VO2(M) nanoparticles that are essential materials to fabricate thermochromic flexible films remains a challenge, preventing effective use of their promising properties. Here, we report an original hydrothermal approach by controlling oxidizing atmosphere of reaction with hydrogen peroxide to prepare ultrafine VO2(M) nanoparticles free from annealing. Hydrogen peroxide is separated from precursor solution in a reactor, which creates a moderate oxygenation environment, enabling the formation of stoichiometric VO2(M) nanoparticles. The obtained VO2(M) nanoparticles are well-dispersed, highly uniform, and single-phase, with an average particle size ∼30 nm. The flexible thermochromic films fabricated with the VO2(M) nanoparticles exhibit excellent thermochromic performance with a solar modulation efficiency of 12.34% and luminous transmittance of 54.26%. While the films prepared with annealed nanoparticles show reduced transmittance due to light scattering of the large size particles resulting from agglomeration and growth during annealing. This work demonstrates a promising technique to realize moderate oxidizing atmosphere by hydrothermal process for preparing well-dispersed stoichiometric nano-oxides.
Collapse
Affiliation(s)
- Deyu Guo
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Chen Ling
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Chengzhi Wang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Dan Wang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Jingbo Li
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Zhengjing Zhao
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Zehao Wang
- Department of Chemistry , National University of Singapore , Singapore 119077 , Singapore
| | - Yongjie Zhao
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Jiatao Zhang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| | - Haibo Jin
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China
| |
Collapse
|
12
|
Fan L, Wang X, Wang F, Zhang Q, Zhu L, Meng Q, Wang B, Zhang Z, Zou C. Revealing the role of oxygen vacancies on the phase transition of VO 2 film from the optical-constant measurements. RSC Adv 2018; 8:19151-19156. [PMID: 35539638 PMCID: PMC9080608 DOI: 10.1039/c8ra03292k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 05/18/2018] [Indexed: 11/21/2022] Open
Abstract
Vanadium dioxide (VO2) material shows a distinct metal–insulator transition (MIT) at the critical temperature of ∼340 K. Similar to other correlated oxides, the MIT properties of VO2 is always sensitive to those crystal defects such as oxygen vacancies. In this study, we investigated the oxygen vacancies related phase transition behavior of VO2 crystal film and systematically examined the effect of oxygen vacancies from the optical constant measurements. The results indicated that the oxygen vacancies changed not only the electron occupancy on V 3d–O 2p hybrid-orbitals, but also the electron–electron correlation energy and the related band gap, which modulated the MIT behavior and decreased the critical temperature resultantly. Our work not only provided a facile way to modulate the MIT behavior of VO2 crystal film, but also revealed the effects of the oxygen vacancies on the electronic inter-band transitions as well as the electronic correlations in driving this MIT process. Optical conductivity spectroscopy was performed to reveal the role of oxygen vacancies during VO2 metal–insulator transition.![]()
Collapse
Affiliation(s)
- Lele Fan
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology Yancheng 224051 P. R. China .,National Synchrotron Radiation Laboratory, University of Science and Technology of China Hefei 230029 P. R. China
| | - Xiangqi Wang
- Department of Physics, University of Science and Technology of China Hefei 230026 P. R. China
| | - Feng Wang
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology Yancheng 224051 P. R. China
| | - Qinfang Zhang
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology Yancheng 224051 P. R. China
| | - Lei Zhu
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology Yancheng 224051 P. R. China
| | - Qiangqiang Meng
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology Yancheng 224051 P. R. China
| | - Baolin Wang
- School of Physical Science and Technology, Nanjing Normal University Nanjing 210023 P. R. China
| | - Zengming Zhang
- Department of Physics, University of Science and Technology of China Hefei 230026 P. R. China
| | - Chongwen Zou
- National Synchrotron Radiation Laboratory, University of Science and Technology of China Hefei 230029 P. R. China
| |
Collapse
|
13
|
Émond N, Torriss B, Chaker M. Natural and induced growth of VO 2 (M) on VO 2 (B) ultrathin films. Sci Rep 2018; 8:7153. [PMID: 29740103 PMCID: PMC5940801 DOI: 10.1038/s41598-018-25656-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 04/24/2018] [Indexed: 11/16/2022] Open
Abstract
This work examines the synthesis of single phase VO2 (B) thin films on LaAlO3 (100) substrates, and the naturally-occurring and induced subsequent growth of VO2 (M) phase on VO2 (B) films. First, the thickness (t) dependence of structural, morphological and electrical properties of VO2 films is investigated, evidencing that the growth of VO2 (B) phase is progressively replaced by that of VO2 (M) when t > ~11 nm. This change originates from the relaxation of the substrate-induced strain in the VO2 (B) films, as corroborated by the simultaneous increase of surface roughness and decrease of the c-axis lattice parameter towards that of bulk VO2 (B) for such films, yielding a complex mixed-phase structure composed of VO2 (B)/VO2 (M) phases, accompanied by the emergence of the VO2 (M) insulator-to-metal phase transition. Second, the possibility of inducing this phase conversion, through a proper surface modification of the VO2 (B) films via plasma treatment, is demonstrated. These natural and induced VO2 (M) growths not only provide substantial insights into the competing nature of phases in the complex VO2 polymorphs system, but can also be further exploited to synthesize VO2 (M)/VO2 (B) heterostructures at the micro/nanoscale for advanced electronics and energy applications.
Collapse
Affiliation(s)
- Nicolas Émond
- INRS-Énergie, Matériaux et Télécommunications, 1650, Boulevard Lionel Boulet, Varennes, Québec, J3X 1S2, Canada
| | - Badr Torriss
- INRS-Énergie, Matériaux et Télécommunications, 1650, Boulevard Lionel Boulet, Varennes, Québec, J3X 1S2, Canada
| | - Mohamed Chaker
- INRS-Énergie, Matériaux et Télécommunications, 1650, Boulevard Lionel Boulet, Varennes, Québec, J3X 1S2, Canada.
| |
Collapse
|
14
|
Lee M, Kim D. The Control of Transition Behavior of VO2
Film Deposited on Sapphire (0001) Substrate by the Organic Polymer-Assisted Thermal Deposition. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11388] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Myeongsoon Lee
- Department of Chemistry; Pukyong National University; Busan 48513 Korea
| | - Don Kim
- Department of Chemistry; Pukyong National University; Busan 48513 Korea
| |
Collapse
|
15
|
Takai C, Senna M, Hoshino S, Razavi-Khosroshahi H, Fuji M. Chemical and thermal properties of VO2 mechanochemically derived from V2O5 by co-milling with paraffin wax. RSC Adv 2018; 8:21306-21315. [PMID: 35539917 PMCID: PMC9080850 DOI: 10.1039/c8ra02159g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/29/2018] [Indexed: 01/09/2023] Open
Abstract
A novel mechanochemical reduction process of V2O5 to VO2 was established by milling with paraffin wax (PW, average molecular weight 254–646), serving as a reductant. The reduction progressed with increasing milling time and mass ratio V2O5 : PW (MRVP). The mechanochemically derived VO2 became phase pure after milling for 3 h with an MRVP of 30 : 1 and exhibited a reversible polymorphic transformation between tetragonal and monoclinic phases at around 53–60 °C and 67–79 °C during heating and cooling, respectively. The latent heat was above 20 J g−1 in both processes, being superior to those of commercial VO2. Doping of starting V2O5 with Cr, Mo or W at 1 at% in the form of oxide did not increase the latent heat. This is another difference from the conventionally prepared doped VO2. These anomalous heat storage properties of mechanochemically derived VO2 were discussed mainly on the basis of X-ray photoelectron spectroscopy V2p3/2 peaks combined with ion etching. The observed relatively high heat storage capacity of undoped VO2 is primarily ascribed to the abundance of V4+ ionic states introduced during milling with PW, which were stabilized with simultaneously introduced structural degradation throughout the entire particles. The possible role of a remaining small amount of PW was also discussed. Reduction of V2O5via a mechano-chemical route brings about unique electronic states of vanadium. The resulting VO2 exhibits high latent heat storage during heating (a) and cooling (b).![]()
Collapse
Affiliation(s)
- Chika Takai
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
| | - Mamoru Senna
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
- Faculty of Science and Technology
| | - Satoshi Hoshino
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
| | | | - Masayoshi Fuji
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
| |
Collapse
|