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学者姓名：汪宏
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Abstract ：
Electrochromic displays with bistable color states provide a promising means toward transparent human-machine interfaces. However, the need for external power and the weak optical modulation in the visible light region of most electrochromic devices hinder their practical applications in displays. Here we prepare the MoO3-y/WO3-x films based on MoO3-y nanosheets, which show a dark blue color that matches the response of the eye and meets visual comfort standards compared to pure WO3-x film. By introducing the highly transparent Al3+ ion hydrogel layer, a convenient electrochromic device driven by the internal chemical potential has been designed. The device based on the MoO3-y/WO3-x film exhibits a high optical modulation in the whole visible light range and can operate at self-powered mode with fast response speed and excellent cycle stability. Moreover, we develop an ionic writing board based on the MoO3-y/WO3-x film to surmount the fixed display information issue in conventional electrochromic displays. The ionic writing board exhibits excellent visual display quality and realizes arbitrary writing with a self-powered characteristic. This work provides a simple mechanochemical synthesis procedure of MoO3-y nanosheets and an ingenious design of self-powered electrochromic devices, which will enable the development of next-generation high-performance electrochromic displays.
Keyword ：
electrochromic mechanochemical molybdenum oxide nanosheets rewritable displays self-powered
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| GB/T 7714 | Wu, Wenting , Fang, Huajing , Ma, Hailong et al. Self-Powered Rewritable Electrochromic Display based on WO3-x Film with Mechanochemically Synthesized MoO3-y Nanosheets [J]. | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (17) : 20326-20335 . |
| MLA | Wu, Wenting et al. "Self-Powered Rewritable Electrochromic Display based on WO3-x Film with Mechanochemically Synthesized MoO3-y Nanosheets" . | ACS APPLIED MATERIALS & INTERFACES 13 . 17 (2021) : 20326-20335 . |
| APA | Wu, Wenting , Fang, Huajing , Ma, Hailong , Wu, Liangliang , Wang, Qing , Wang, Hong . Self-Powered Rewritable Electrochromic Display based on WO3-x Film with Mechanochemically Synthesized MoO3-y Nanosheets . | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (17) , 20326-20335 . |
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Abstract ：
Ultraviolet (UV) radiation is crucial for the survival and evolution of organisms, while multifunctional electronics for smart UV management remain undeveloped. Herein, we design a novel monolithic integrated photoelectrochemical (PEC) device, in which the TiO2 film, meshy Pt layer and viologen solution are used as the photoelectrode, counter electrode, and electrolyte, respectively. The obtained device exhibits three functions, including photodetection, electrochromism, and light-assisted coloration function, which can detect, shield, and trace the UV radiation. Meanwhile, the PEC device possesses excellent properties, including a high photoresponsivity of 20 mA/W, a high coloration efficiency of 236.7 cm2/C at a wavelength of 600 nm, 98.5% UV blocking mainly in UV-A range, and an instant light-assisted coloring process. By combining the passive detecting and the active shielding, the PEC device enables the intelligent management of the UV radiation, which also provides a general strategy for designing and fabricating multifunctional smart electronics. © 2021 Elsevier Ltd
Keyword ：
Biology Electrolytes Monolithic integrated circuits Oxide minerals Photoelectrochemical cells Radiation shielding Titanium dioxide Ultraviolet radiation
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| GB/T 7714 | Wu, L , Fang, H , Wu, W et al. Monolithic integrated multifunctional photoelectrochemical device for smart ultraviolet management [J]. | Materials Today Energy , 2021 , 20 . |
| MLA | Wu, L et al. "Monolithic integrated multifunctional photoelectrochemical device for smart ultraviolet management" . | Materials Today Energy 20 (2021) . |
| APA | Wu, L , Fang, H , Wu, W , Ma, H , Zheng, C , Wang, H . Monolithic integrated multifunctional photoelectrochemical device for smart ultraviolet management . | Materials Today Energy , 2021 , 20 . |
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Abstract ：
Appropriate preparation routes allow designing and improving the performances of ceramic-based functional composites. In this work, two powder-preparation methods enabled by the cold sintering process are utilized to fabricate unique ZnO-based varistor composites. The thermoplastic polymer, poly-ether-ether-ketone (PEEK), has been successfully integrated with ZnO to form dense ZnO-PEEK composites. With a dissolution method, PEEK particles can be homogeneously dissolved by the mixed solution of tetrahydrofuran and toluene and then form nanoscale thin grain boundaries after cold sintering process. In the direct mixing method, large PEEK particles are observed in the cold sintered samples. A Finite Element Method (FEM) analysis indicates that von-mises stresses concentrate at the grain boundaries of ZnO and at the interfaces of ZnO and PEEK, and these can be increased with the increase of PEEK particle sizes. The electrical properties have been improved with the addition of PEEK, and the cold sintered 95ZnO-5PEEK shows a high breakdown electric field (0.1 mA/mm2) of 3070 V/mm, and a nonlinear coefficient of 5. In addition, the conduction mechanism of the composites has been investigated using impedance spectroscopy. Overall, our work provides a strategy for the development of high-performance ceramic-polymer composites via cold sintering process. © 2021
Keyword ：
Electric fields Ethers Grain boundaries II-VI semiconductors Ketones Oxide minerals Particle size analysis Sintering Zinc oxide
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| GB/T 7714 | Si, Mingming , Hao, Jianyu , Zhao, Enda et al. Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process [J]. | Acta Materialia , 2021 , 215 . |
| MLA | Si, Mingming et al. "Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process" . | Acta Materialia 215 (2021) . |
| APA | Si, Mingming , Hao, Jianyu , Zhao, Enda , Zhao, Xuetong , Guo, Jing , Wang, Hong et al. Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process . | Acta Materialia , 2021 , 215 . |
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Abstract ：
The manipulation of interfacial structures offers an effective route to improve the physical and chemical properties of materials. However, it is challenging to design ceramic-based composites with hybrid interfaces involved with organics and inorganics through the conventional sintering technique, due to the incompatibility of these materials at high temperatures. Here, we propose a strategy to integrate poly-ether-ether-ketone together with several metal-oxide additives into zinc oxide (ZnO) to form composite varistors via cold sintering process. Nanoscale layers of hybrid additives are dispersed between densified ZnO grain structures forming Schottky barriers, which dramatically improves the electrical properties of the resulted composites. Compared with pure ZnO, the breakdown electric field at 0.1 mA mm(-2) reaches over 13 kV mm(-1). Particularly, the composite shows a switch-like effect similar with switching devices, with an extraordinarily high nonlinear coefficient of 375. In addition, the elastic module decreases with the addition of PEEK. Given the flexibility in the dopants of polymers and metal oxides, this work provides a unique route to design composite materials with superior performances.
Keyword ：
Cold sintering process Dielectrics Inorganic-organic composites Varistors Zinc oxide
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| GB/T 7714 | Si, Mingming , Guo, Jing , Hao, Jianyu et al. Cold sintered composites consisting of PEEK and metal oxides with improved electrical properties via the hybrid interfaces [J]. | COMPOSITES PART B-ENGINEERING , 2021 , 226 . |
| MLA | Si, Mingming et al. "Cold sintered composites consisting of PEEK and metal oxides with improved electrical properties via the hybrid interfaces" . | COMPOSITES PART B-ENGINEERING 226 (2021) . |
| APA | Si, Mingming , Guo, Jing , Hao, Jianyu , Zhao, Xuetong , Randall, Clive A. , Wang, Hong . Cold sintered composites consisting of PEEK and metal oxides with improved electrical properties via the hybrid interfaces . | COMPOSITES PART B-ENGINEERING , 2021 , 226 . |
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Abstract ：
Electrochromic technology plays a significant role in energy conservation, while its performance is greatly limited by the transport behavior of ions and electrons. Hence, an electrochromic system with overall excellent performances still need to be explored. Initially motivated by the high ionic and electronic conductivity of transition metal carbide or nitride (MXene), we design a feasible procedure to synthesize the MXene/WO3−x composite electrochromic film. The consequently boosted electrochromic performances prove that the addition of MXene is an effective strategy for simultaneously enhancing electrons and ions transport behavior in electrochromic layer. The MXene/WO3−x electrochromic device exhibits enhanced transmittance modulation and coloration efficiency (60.4%, 69.1 cm2 C−1), higher diffusion coefficient of Li+ and excellent cycling stability (200 cycles) over the pure WO3−x device. Meanwhile, numerical stimulation theoretically explores the mechanism and kinetics of the lithium ion diffusion, and proves the spatial and time distributions of higher Li+ concentration in MXene/WO3−x composite electrochromic layer. Both experiments and theoretical data reveal that the addition of MXene is effective to promote the transport kinetics of ions and electrons simultaneously and thus realizing a high-performance electrochromic device. This work opens new avenues for electrochromic materials design and deepens the study of kinetics mechanism of ion diffusion in electrochromic devices.[Figure not available: see fulltext.] © 2020, The Author(s).
Keyword ：
Carbides Diffusion Electrochromic devices Electrochromism Electrons Ions Kinetics Transition metals Tungsten compounds
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| GB/T 7714 | Wu, Wenting , Fang, Huajing , Ma, Hailong et al. Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance [J]. | Nano-Micro Letters , 2021 , 13 (1) . |
| MLA | Wu, Wenting et al. "Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance" . | Nano-Micro Letters 13 . 1 (2021) . |
| APA | Wu, Wenting , Fang, Huajing , Ma, Hailong , Wu, Liangliang , Zhang, Wenqing , Wang, Hong . Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance . | Nano-Micro Letters , 2021 , 13 (1) . |
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Abstract ：
Crystal water is a kind of water molecules that are incorporated into the crystal structure of hydrated salts, which are generally decomposed at very low temperatures (usually 100 similar to 200 degrees C). Na2WO4 is a compound that could react with H2O forming the Na2WO4 center dot 2H(2)O hydrated crystal salt under certain conditions. In this work, the cold sintering of Na2WO4 ceramics is studied using a Na2WO4-2H2O chemistry at a low sintering temperature of 120 degrees C. Their sintering mechanism has been investigated using SEM, TEM, DSC, FTIR, together with the shrinkage rates of the samples. During the sintering process, the intentionally added liquid water reacts with Na2WO4 powders to produce a Na2WO4 center dot 2H(2)O and Na2WO4 composite, and the crystal water can be decomposed from the Na2WO4 center dot 2H(2)O phase under a certain sintering condition. The water in both liquid and solid forms contributes to the densification of Na2WO4 ceramics. Finally, dense Na2WO4 ceramics with excellent properties (permittivity: 5.7; Q x f: 70 000 GHz; TCF: -70 ppm/degrees C) have been obtained by removing the residual water after a heat treatment. Such sintering process can be generalized to the densification of other inorganic materials that easily react with liquid water to form hydrated salts, which provides a strategy for the cold sintering with crystal water.
Keyword ：
Cold sintering process Hydrated flux Hydrated salt Microwave dielectrics Na2WO4 Sintering mechanism
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| GB/T 7714 | Hao, Jianyu , Guo, Jing , Ma, Chuansheng et al. Cold Sintering of Na2WO4 Ceramics using a Na2WO4-2H(2)O Chemistry [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (12) : 6029-6034 . |
| MLA | Hao, Jianyu et al. "Cold Sintering of Na2WO4 Ceramics using a Na2WO4-2H(2)O Chemistry" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 41 . 12 (2021) : 6029-6034 . |
| APA | Hao, Jianyu , Guo, Jing , Ma, Chuansheng , Yao, Fang-Zhou , Yao, Bin , Si, Mingming et al. Cold Sintering of Na2WO4 Ceramics using a Na2WO4-2H(2)O Chemistry . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (12) , 6029-6034 . |
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Abstract ：
In this work, a sintering route named cold sintering assisted two step sintering process (CSP-TS) is presented to prepare rutile TiO2 ceramics with submicron grain sizes. Cold sintering process at 300 ?C with tetrabutyl titanate and water as the liquid phase yields a ?green body? with a relatively high density of -80 %, and finally dense (98.5?99.8 %) rutile TiO2 ceramics with grain sizes of -600 nm can be obtained in the second sintering process at 950-1000 ?C. The microstructural analysis with SEM and TEM indicates that the CSP-TS samples sintered at 950 ?C have an obvious phenomenon of recrystallization, accompanying by a decrease of amorphous phases and a formation of clear grain boundaries. Besides, the rutile TiO2 ceramics prepared by CSP-TS possess excellent microwave dielectric properties with relative permittivity of 92.0?98.4 and Q x f values of 27,800-31,900 GHz. Therefore, it is feasible to utilize CSP-TS to prepare ceramics with small grain sizes at low sintering temperatures.
Keyword ：
Cold sintering process Low-temperature sintering Microwave dielectric properties nano-ceramics Rutile titanium dioxide Submicron
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| GB/T 7714 | Zhao, Enda , Hao, Jianyu , Xue, Xian et al. Rutile TiO2 microwave dielectric ceramics prepared via cold sintering assisted two step sintering [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (6) : 3459-3465 . |
| MLA | Zhao, Enda et al. "Rutile TiO2 microwave dielectric ceramics prepared via cold sintering assisted two step sintering" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 41 . 6 (2021) : 3459-3465 . |
| APA | Zhao, Enda , Hao, Jianyu , Xue, Xian , Si, Mingming , Guo, Jing , Wang, Hong . Rutile TiO2 microwave dielectric ceramics prepared via cold sintering assisted two step sintering . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (6) , 3459-3465 . |
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| GB/T 7714 | Wu, Wenting , Fang, Huajing , Ma, Hailong et al. Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance (vol 13, 20, 2021) [J]. | NANO-MICRO LETTERS , 2021 , 13 (1) . |
| MLA | Wu, Wenting et al. "Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance (vol 13, 20, 2021)" . | NANO-MICRO LETTERS 13 . 1 (2021) . |
| APA | Wu, Wenting , Fang, Huajing , Ma, Hailong , Wu, Liangliang , Zhang, Wenqing , Wang, Hong . Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance (vol 13, 20, 2021) . | NANO-MICRO LETTERS , 2021 , 13 (1) . |
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Abstract ：
In this work, we investigate the influence of defect concentration of the diamond substrates on the performance of hydrogen-terminated diamond field-effect transistors by Raman spectra, pulsed I-V characteristics analysis, and radio frequency performances measurements. It is found that a sample with higher defect concentration shows larger drain-lag effect and lower large-signal output power density. Defects in the diamond act as traps in the carrier transport and have a considerable influence on the large-signal output power density of diamond field-effect transistors. This work should be helpful for further performance improvement of the microwave power diamond devices. © 2020 Chinese Institute of Electronics
Keyword ：
Defect; Diamond; Power density; Transistor; Trap
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| GB/T 7714 | Zhou, R. , Yu, C. , Zhou, C. et al. Performance of hydrogenated diamond field-effect transistors on single and polycrystalline diamond [J]. | Journal of Semiconductors , 2020 , 41 (12) . |
| MLA | Zhou, R. et al. "Performance of hydrogenated diamond field-effect transistors on single and polycrystalline diamond" . | Journal of Semiconductors 41 . 12 (2020) . |
| APA | Zhou, R. , Yu, C. , Zhou, C. , Guo, J. , He, Z. , Wang, Y. et al. Performance of hydrogenated diamond field-effect transistors on single and polycrystalline diamond . | Journal of Semiconductors , 2020 , 41 (12) . |
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Abstract ：
Dielectric capacitors with the prominent features of ultrafast charging-discharging rates and ultrahigh power densities are ubiquitous components in modern electronics. To meet the growing demand for electronics miniaturization, dielectric capacitors with high energy storage properties are extensively researched. Here we present an overview of the recent progress in the engineering of multiscale structures of dielectric ceramics ranging from bulk to thin films. This article commences with a brief introduction of the fundamentals of dielectric ceramics, including primary parameters, a library of dielectric ceramics, and multiscale structures. Emphases are placed on the relationship between multiscale structures and energy storage properties and the rational structure design principles in dielectric ceramics. Also included are currently available multilayer ceramic capacitors based on multiscale engineered ceramic structures. Finally, challenges along with opportunities for further research and development of high-performance dielectric ceramics for electrostatic energy storage are highlighted.
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| GB/T 7714 | Yao, Fang-Zhou , Yuan, Qibin , Wang, Qing et al. Multiscale structural engineering of dielectric ceramics for energy storage applications: from bulk to thin films [J]. | NANOSCALE , 2020 , 12 (33) : 17165-17184 . |
| MLA | Yao, Fang-Zhou et al. "Multiscale structural engineering of dielectric ceramics for energy storage applications: from bulk to thin films" . | NANOSCALE 12 . 33 (2020) : 17165-17184 . |
| APA | Yao, Fang-Zhou , Yuan, Qibin , Wang, Qing , Wang, Hong . Multiscale structural engineering of dielectric ceramics for energy storage applications: from bulk to thin films . | NANOSCALE , 2020 , 12 (33) , 17165-17184 . |
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