Article
Chemistry, Multidisciplinary
Shanguang Zhao, Liang Li, Changlong Hu, Bowen Li, Meiling Liu, Jinglin Zhu, Ting Zhou, Weidong Shi, Chongwen Zou
Summary: In the context of the information explosion society, there is a strong demand for information security in practical applications. This paper proposes an innovative strategy for data encryption and reading during confidential data transmission using VO2 devices. The specific insulator-to-metal transition property of VO2 allows for modulating phase transitions between insulator and metallic states through electric field, temperature, and light radiation. A prototype device fabricated on an epitaxial VO2 film demonstrates excellent stability and unique data encryption function. This study not only presents a multiphysical field-modulated VO2 device for information encryption, but also provides clues for functional devices applications in other correlated oxide materials.
Article
Energy & Fuels
Kaihao Bai, Chuanchang Li, Baoshan Xie, Dongyao Zhang, Youfu Lv, Junbing Xiao, Meizhi He, Xiaoliang Zeng, Julan Zeng, Jian Chen
Summary: In this study, a novel PEG/VO2 dual phase change material with phase transition temperature gradients was prepared using the vacuum impregnation method. Expanded graphite was introduced to improve the stability and thermal conductivity of the material. The results showed that the PEG/VO2/EG material had high thermal storage capacity and thermal conductivity, and a faster response to ambient temperature. It also showed potential for thermal management of lithium-ion batteries.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Optics
Jonathan King, Chenghao Wan, Tae Joon Park, Sanket Deshpande, Zhen Zhang, Shriram Ramanathan, Mikhail A. Kats
Summary: We demonstrate an electrically controlled VO2-metal metasurface that functions as a tunable optical switch, optical limiter with tunable threshold, and nonlinear optical isolator. The device achieves tunability through Joule heating and shows promising applications.
Article
Optics
Mark Lust, Ilya Vitebskiy, Igor Anisimov, Nima Ghalichechian
Summary: We present a novel four-port optical router based on the non-linear properties of vanadium dioxide (VO2) phase-change material. The router achieves asymmetrical power threshold response with power limiting capability. The device design, including waveguide structure and ring resonators, is optimized for operation at a wavelength of 5.0 μm. The router demonstrates significant power limiting in both forward and reverse modes, with a total transmission rate of 75% in the inactivated mode. Bi-stability and latching behavior are also observed and discussed.
Article
Optics
Jose Figueroa, Henry Dsouza, Juan Pastrana, David Torres, Harris Hall, Kevin Leedy, Nelson Sepulveda
Summary: VO2-based MEMS tunable optical shutters with unique design for flexible optical modulation have been demonstrated. Optical transmittance can be adjusted using electric current, allowing for modulation of light intensity. Unlike traditional mechanical shutters, these devices offer greater optical tuning capabilities.
Article
Physics, Applied
Jiangxiao Li, Ziyue Wang, Lin Zu, Xinyan Chen, Lingling Kuang, Yajun Tao, Yu He, Jingtian Zhou, Yongqi Dong, Bin Hong, Zhenlin Luo
Summary: The generation and control of multiple phases via hydrogen insertion offer new opportunities for tuning the properties of transition metal oxides. In this study, the complete structural phase transitions during the reversible process of hydrogen insertion into and extraction from the vanadium dioxide lattice were accurately probed using in situ x-ray diffraction and electrical measurements. The ability to switch between hydrogenated VO2 phases and the pristine VO2 phase repeatedly suggests potential applications in hydrogen detection/storage and multi-state information storage. Furthermore, synchrotron x-ray absorption spectroscopy and theoretical first-principles calculations were used to investigate the different phases, revealing that hydrogen insertion significantly affects the filling of the d-band and the electrical properties. This work provides fundamental insights into hydrogen-induced phase transition in metal oxides and has the potential to guide the development of proton-based sensors and devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Dong-Qin Zhang, Yi Tao, Gui-Ming Pan, Zhong-Wei Jin, Bin Fang, Zhi Hong, Fang-Zhou Shu
Summary: Switchable transmissive and reflective metadevices have been demonstrated by combining metasurfaces with vanadium dioxide. The metasurface can be switched between transmissive and reflective modes by carefully designing the structures and utilizing the phase transition of vanadium dioxide. These switchable metadevices have potential applications in imaging, communication, and information processing.
Article
Materials Science, Multidisciplinary
Hanzhi Han, Changqing Fang, Youliang Cheng, Jie Liu, Jiarui Zhao, Qingling Zhang, Mengyao Li, Tan Mao
Summary: The thermochromic behaviors of VO2(M) nanoparticles are significantly influenced by the size purity and crystallinity of the particles. In this study, an orthogonal array design was used to optimize the preparation conditions and achieve high-throughput production of VO2(M) nanoparticles with controllable morphology and size. The experimental results revealed that the fill ratio, reaction time, annealing time, and annealing temperature all had an impact on the size of the nanoparticles, with the fill ratio being the most influential factor. The optimized parameters were validated, and pure VO2(M) nanoparticles with a diameter of approximately 60 nm were successfully prepared.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Physics, Applied
Junhao Niu, Qianyu Yao, Wei Mo, Chunhui Li, Tao Chen
Summary: We propose a switchable metamaterial absorber (MMA) based on the phase-transition characteristics of vanadium dioxide (VO2), achieving bandwidth tunable broadband and four-band absorption in the terahertz (THz) band. The MMA demonstrates over 90% broadband absorption in the 3.06-7.61, 3.18-8.91, and 2.78-9.22 THz ranges for different conductivity values of VO2, and it also achieves high absorption at four different frequencies when VO2 is in the insulator phase. The proposed MMA solves the problem of decreased absorption bandwidth caused by a decrease in VO2 conductivity and has potential applications in stealth technology and selective thermal emitters.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Manish Kumar, Sunita Rani, Hyun Hwi Lee
Summary: A thin film of thermochromic VO2 was prepared on an m-Al2O3 substrate using RF magnetron sputtering. The epitaxial growth of monoclinic M-1 phase of VO2 on m-Al2O3 substrate was confirmed by synchrotron XRD measurements. The temperature-dependent XRD and electrical resistance measurements showed reversible metal-to-insulator transition at approximately 68°C.
Article
Chemistry, Multidisciplinary
Sergey Mutilin, Victor Ya Prinz, Lyubov Yakovkina, Anton K. Gutakovskii
Summary: This study developed a strategy for the formation of hybrid Si/VO2 nanostructures compatible with standard silicon technology, based on selective synthesis of VO2 crystals on 3D silicon structures. The method allows for precise arrays of VO2 nanorings on silicon cylinders, opening up possibilities for post-silicon optoelectronics and neuromorphic circuits.
Article
Chemistry, Physical
Dooyong Lee, Taewon Min, Jiwoong Kim, Sehwan Song, Jisung Lee, Haeyong Kang, Jouhahn Lee, Deok-Yong Cho, Jaekwang Lee, Jae Hyuck Jang, Sungkyun Park
Summary: The study found that octahedral symmetry in VO2 can control its IMT characteristics by changing orbital occupancy, and monoclinic VO2 with high octahedral symmetry exhibits bandwidth-controlled IMT characteristics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yuan Li, He Ma, Fawei Tang, Chenyu Li, Bolun Wang, Xiaoyan Song, Kai Liu, Xinping Zhang
Summary: This paper develops a laser direct writing technique on freestanding vanadium dioxide (VO2) film for fabricating microactuators with arbitrary shapes. The precision of laser direct writing is high, and the pulse energy is low, resulting in increased fabricating efficiency and flexibility. This fabrication strategy can also be applied to the fabrication of other smart microdevices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Nanoscience & Nanotechnology
Daniel Koch, Mohamed Chaker
Summary: This study theoretically investigates the thermochromic properties of doped vanadium dioxide and finds that the transition temperature is mainly influenced by lattice deformations caused by the presence of dopant ions. The limitations of substitutional dopants on the thermochromic performance of VO2 are identified, and alternative approaches are proposed to ensure a low transition temperature and no loss of optical contrast.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Hiroshi Kakiuchida, Masahisa Okada, Yasusei Yamada, Masato Tazawa
Summary: Titanium-vanadium dioxide films with different compositions were analyzed using ellipsometry at various temperatures to study their optical properties. The results showed changes in energy gaps and electron quantities during electronic band transitions near the semiconductor-to-metal transition temperature.
APPLIED PHYSICS LETTERS
(2021)
