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Cold Sintering of Na2WO4 Ceramics using a Na2WO4-2H(2)O Chemistry EI SCIE
期刊论文 | 2021 , 41 (12) , 6029-6034 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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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 :

Hydrated salt Sintering mechanism Microwave dielectrics Na2WO4 Hydrated flux Cold sintering process

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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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Cold sintered composites consisting of PEEK and metal oxides with improved electrical properties via the hybrid interfaces EI SCIE
期刊论文 | 2021 , 226 | COMPOSITES PART B-ENGINEERING
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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 :

Inorganic-organic composites Zinc oxide Cold sintering process Dielectrics Varistors

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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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Monolithic integrated multifunctional photoelectrochemical device for smart ultraviolet management EI SCIE
期刊论文 | 2021 , 20 | Materials Today Energy
WoS CC Cited Count: 1
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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 :

Monolithic integrated circuits Oxide minerals Photoelectrochemical cells Electrolytes Titanium dioxide Ultraviolet radiation Biology Radiation shielding

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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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Self-Powered Rewritable Electrochromic Display based on WO3-x Film with Mechanochemically Synthesized MoO3-y Nanosheets EI SCIE PubMed
期刊论文 | 2021 , 13 (17) , 20326-20335 | ACS APPLIED MATERIALS & INTERFACES
WoS CC Cited Count: 1
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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 :

rewritable displays molybdenum oxide nanosheets electrochromic self-powered mechanochemical

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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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Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance (vol 13, 20, 2021) SCIE PubMed CSCD
期刊论文 | 2021 , 13 (1) | NANO-MICRO LETTERS
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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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Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance EI SCIE PubMed CSCD
期刊论文 | 2021 , 13 (1) | Nano-Micro Letters
WoS CC Cited Count: 5
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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 :

Kinetics Tungsten compounds Diffusion Electrochromism Electrons Carbides Ions Transition metals Electrochromic devices

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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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Preparation of zinc oxide/poly-ether-ether-ketone (PEEK) composites via the cold sintering process EI SCIE
期刊论文 | 2021 , 215 | Acta Materialia
WoS CC Cited Count: 3
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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 :

Sintering Particle size analysis II-VI semiconductors Ketones Oxide minerals Electric fields Zinc oxide Ethers Grain boundaries

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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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Rutile TiO2 microwave dielectric ceramics prepared via cold sintering assisted two step sintering EI SCIE
期刊论文 | 2021 , 41 (6) , 3459-3465 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 2
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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 :

nano-ceramics Microwave dielectric properties Low-temperature sintering Submicron Cold sintering process Rutile titanium dioxide

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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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A high-performance transparent photodetector via building hierarchical g-C3N4 nanosheets/CNTs van der Waals heterojunctions by a facile and scalable approach EI SCIE Scopus
期刊论文 | 2020 , 529 | Applied Surface Science | IF: 6.707
WoS CC Cited Count: 7
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Abstract :

Graphitic-carbon nitride (g-C3N4) as a novel two-dimensional (2D) material has attracted considerable attentions due to its unique properties and diverse applications. However, the poor electron-hole (e-h) separation efficiency and short carrier diffusion length greatly hinder its application in optoelectronic devices. Here, we present a solution-processed photodetector based on the g-C3N4 nanosheets and carbon nanotubes (CNTs). Through a layer by layer spin coating method, a grid-like active layer with a large number of g-C3N4 nanosheets/CNTs van der Waals heterojunctions can be assembled. This subtle structure endows the device an outstanding photoelectric conversion performance as well as a high transparency (72%). The photodetector exhibits a broadband response to UV and visible light. Under 365 nm UV illumination, a high responsivity up to 0.23 A/W has been obtained, which exceeds those of most current transparent photodetectors. This work not only presents the first transparent device based on g-C3N4, but also provides a paradigm on designing low-cost and high performance electronic devices with van der Waals heterojunctions. © 2020

Keyword :

Carbon nitride Van der Waals forces Photoelectricity Photodetectors Heterojunctions Photons Nanosheets Carbon nanotubes

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GB/T 7714 Fang, Huajing , Ma, Hailong , Zheng, Cheng et al. A high-performance transparent photodetector via building hierarchical g-C3N4 nanosheets/CNTs van der Waals heterojunctions by a facile and scalable approach [J]. | Applied Surface Science , 2020 , 529 .
MLA Fang, Huajing et al. "A high-performance transparent photodetector via building hierarchical g-C3N4 nanosheets/CNTs van der Waals heterojunctions by a facile and scalable approach" . | Applied Surface Science 529 (2020) .
APA Fang, Huajing , Ma, Hailong , Zheng, Cheng , Lennon, Sean , Wu, Wenting , Wu, Liangliang et al. A high-performance transparent photodetector via building hierarchical g-C3N4 nanosheets/CNTs van der Waals heterojunctions by a facile and scalable approach . | Applied Surface Science , 2020 , 529 .
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Self-doped tungsten oxide films induced by: In situ carbothermal reduction for high performance electrochromic devices EI SCIE Scopus
期刊论文 | 2020 , 8 (40) , 13999-14006 | Journal of Materials Chemistry C | IF: 7.393
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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Abstract :

As a promising electrochromic material, tungsten oxide is of great value for applications in smart windows and energy saving displays. Fabricating high performance tungsten oxide by the cost-effective way is immensely in demand for promoting the large-scale application. Herein, we demonstrate a green and economic route in developing self-doped tungsten oxide (WO3-x) films. Through the precursor design and carbonization process, amorphous carbon can be obtained and used as an in situ reducing agent. Then, oxygen vacancies and nanopores were generated in WO3-x films by carbothermal reduction during annealing. The self-doping WO3-x film exhibits a remarkable optical modulation (∼70% at 680 nm) in both visible and near infrared bands. The electrochromic switching behavior of the WO3-x film shows a fast response speed (7 s for coloring and 15 s for bleaching), a high coloration efficiency up to 62 cm2 C-1 and a good cycling stability. The enhanced electrochromic properties are attributed to the large specific surface area and oxygen vacancies which facilitate the ion insertion and extraction at the interface. This work offers a highly active electrochromic material as well as an ingenious synthesis strategy for numerous oxygen deficient functional oxides. This journal is © The Royal Society of Chemistry.

Keyword :

Oxide films Oxygen vacancies Carbothermal reduction Energy conservation Infrared devices Carbonization Electrochromism Amorphous carbon Electrochromic devices Semiconductor doping Oxides Cost effectiveness Tungsten compounds

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GB/T 7714 Zhou, Lijun , Wei, Peng , Fang, Huajing et al. Self-doped tungsten oxide films induced by: In situ carbothermal reduction for high performance electrochromic devices [J]. | Journal of Materials Chemistry C , 2020 , 8 (40) : 13999-14006 .
MLA Zhou, Lijun et al. "Self-doped tungsten oxide films induced by: In situ carbothermal reduction for high performance electrochromic devices" . | Journal of Materials Chemistry C 8 . 40 (2020) : 13999-14006 .
APA Zhou, Lijun , Wei, Peng , Fang, Huajing , Wu, Wenting , Wu, Liangliang , Wang, Hong . Self-doped tungsten oxide films induced by: In situ carbothermal reduction for high performance electrochromic devices . | Journal of Materials Chemistry C , 2020 , 8 (40) , 13999-14006 .
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