ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tao Wang,Gang Lian,Liping Huang,Fei Zhu,Deliang Cui,Qilong Wang,Qingbo Meng,Ching-Ping Wong
Perovskite single-crystal (SC) or quasi-single-crystal (QSC) films are promising candidates for excellent performance of photoelectric devices. However, it is still a great challenge to fabricate large-area continuous SC or QSC films with proper thickness. Herein, we propose a pressure-assisted high-temperature solvent-engineer (PTS) strategy to grow large-area continuous MAPbI3 QSC films with uniformly thin thickness and orientation. Dramatic grain growth (∼100 μm in the lateral dimension) and adequate boundary fusion are realized in them, vastly eliminating the grain boundaries. Thus, remarkable diminution of the trap density (ntrap: 7.43 × 1011 cm–3) determines a long carrier lifetime (τ2: 1.7 μs) and superior photoelectric performance of MAPbI3-based lateral photodetectors; for instance, an ultrahigh on/off ratio (>2.4 × 106, 2 V), great stability, fast response (283/306 μs), and high detectivity (1.41 × 1013) are achieved. The combination properties and performance of the QSC films surpass most of the reported MAPbI3. This effective approach in growing perovskite QSC films points out a novel way for perovskite-based optoelectronic devices with superior performance.
研究领域:
材料科学
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光电设备
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kede Wu,Junxiang Cao,Zhen Qian,Yi Luo,Bo Niu,Yayun Zhang,Donghui Long
Carbon aerogels exhibit high porosity, good electrical conductivity , and low thermal conductivity , but their practical applications are greatly hindered by their tedious preparation and inherent structure brittleness . Herein, monolithic carbon aerogels (MCAs) with low density and large size are prepared via a facile sol-gel polymerization of phenolic resin within melamine foam (MF), followed by ambient pressure drying and co-carbonization. During ambient pressure drying process, the MF matrix can deliver supporting force to counteract against the solvent evaporation surface tension, thus inhibiting volume shrinkage and shape deformation. Upon co-carbonization process, the MF matrix and organic aerogel could pyrolyze and shrink cooperatively, which could effectively prevent the brittle fracture of monolith. Therefore, large-sized MCAs (up to 250 × 250 × 20 mm) with low densities of 0.12–0.22 g·cm −3 are obtained. The as-obtained MCAs possess high compressive strength (2.50 MPa), ultra-low thermal conductivity (0.051 W·m −1 ·K −1 at 25 °C and 0.111 W·m −1 ·K −1 at 800 °C), and high-volume organic absorption capability (77.3–88.0%, V/V). This facile and low-cost method for the fabrication of large-sized monolithic carbon aerogels with excellent properties could envision enormous potential for high-temperature thermal insulation and organics absorption.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 22
·18052-18059
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IF 3.289
Yi-Hua Wang,Qi Shi,Hong Xu,Jin-Xiang Dong
Small- and large-sized crystalline ZIF-71 was synthesized using different strategies and has average diameters of approximately 450 nm, and 1–2 μm. Large-sized ZIF-71 particles with good crystallinity were prepared by a solvothermal synthesis method and small-sized ZIF-71 particles were prepared upon the addition of an acidic additive (formic acid) at room temperature. The two different sizes of particles were used as oil additives in liquid paraffin, and investigated using four-ball tribotesters. The results show that the small-sized particles can improve the anti-wear properties and load-carrying abilities of the base oil. The large-sized particles exhibit good load-carrying capacity. Wear surfaces were analysed by using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and Zygo Zegage 3D optical profiler after the wear tests.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Feng Anbo,Xie Shengdan,Fu Xiuwei,Chen Zhaolai,Zhu Wei
Metal halide perovskite single crystals are a promising candidate for X-ray detection due to their large atomic number and high carrier mobility and lifetime. However, it is still challenging to grow large-area and thin single crystals directly onto substrates to meet real-world applications. In this work, millimeter-thick and inch-sized methylammonium lead tribromide (MAPbBr3) single-crystal wafers are grown directly on indium tin oxide (ITO) substrates through controlling the distance between solution surface and substrates. The single-crystal wafers are polished and treated with O3 to achieve smooth surface, lower trap density, and better electrical properties. X-ray detectors with a high sensitivity of 632 µC Gyair−1 cm−2 under –5 V and 525 µC Gyair−1 cm−2 under –1 V bias can be achieved. This work provides an effective way to fabricate substrate-integrated, large-area, and thickness-controlled perovskite single-crystal X-ray detectors, which is instructive for developing imaging application based on perovskite single crystals.
研究领域:
材料科学
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物理学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Wei Q.,Wufuer A.,Wang M.,Wang Y.,Dai L.
Three-dimensional graphene (3DG) sponge has attracted increasing attention because it combines the unique properties of cellular materials and the excellent performance of graphene. Preparation of 3DG sponge depends mainly on the self-assembly of graphene oxide sheets. In the case of using uniform large graphene oxide and ultralarge graphene oxide sheets, the nematic liquid crystals (LCs) phases are formed at low concentration. After chemical reduction, the LCs of GO solution are converted to 3DG sponges with a high degree of orientation, offering a new methodology to regulate the controlled large GO sheets. The orientation of GO solution can be inherited by 3DG sponge, making the sponge to have a large-scale ordered network structure. The 3D elastic graphene sponges have low density and good elasticity, promising for the applications in strain sensing, shock damping, and energy cushioning. Our work explores a novel strategy for organizing the ordered alignment of controlled large GO sheets and exploring the relationship between the microstructures and mechanical properties of 3DG sponge.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
CARBON
·
2017
·
IF 6.337
Yan-Jun Wan,Peng-Li Zhu,Shu-Hui Yu,Rong Sun,Ching-Ping Wong,Wei-Hsin Liao
Large-sized graphene sheets (LG) and doping strategy were employed to fabricate lightweight and flexible graphene paper with exceptional electromagnetic interference (EMI) shielding performance. Compared with the smaller sized ones, LG with fewer defects and more conjugated carbon domain size as well as better alignment result in higher electrical conductivity and strength of graphene paper. The iodine doping further improves the carrier density of LG by formation of triiodide ( I 3 − ) and pentaiodide ( I 5 − ) through charge transfer process without deteriorating the mechanical property, thus leading to superior EMI shielding effectiveness (SE). The EMI SE of iodine doped LG film with thickness of 12.5 μm is up to ∼52.2 dB at 8.2 GHz, which is much higher than that of undoped LG with the same thickness (∼47.0 dB). More important, the improvements in EMI SE is contributed to the SE absorption, while the SE reflection is almost unchanged. The mechanisms of improved EMI shielding performance as well as mechanical property were investigated and discussed. The present study provides a facile way to fully develop graphene in lightweight and flexible EMI shielding materials and devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 12
·期 1
·58
·
IF 2.679
Yuefei Wang,Renjing Song,Li Li,Rongpeng Fu,Zhiguo Liu,Bingsheng Li
The authors report that polypyrrole (PPy) films with large area and high crystalline quality have been achieved using an interfacial chemical oxidation method. By dissolving different reactants in two immiscible solvents, the PPy is synthetized at the interface region of the two solutions. The PPy films have sharp XRD diffraction peaks, indicating that the molecular chains in the film are arranged in a high degree of order and that they reflect high crystalline quality. High crystal quality is also conducive to improving electrical conductivity. The conductivity of the as prepared PPy film is about 0.3 S/cm, and the carrier mobility is about 5 cm2/(Vs). In addition, the biggest advantage of this method is that the prepared PPy film has a large area and is easy to transfer to other substrates. This will confidently broaden the application of PPy in the future.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Baoying Wang,Junying Yan,Huangying Wang,Ruirui Li,Rong Fu,Chenxiao Jiang,Victor Nikonenko,Natalia Pismenskaya,Yaoming Wang,Tongwen Xu
The development of low-resistance ion-exchange membranes enabling fast transport of large-sized metallic anions is extremely desirable for the treatment of metal containing effluents using electrodialysis (ED). Herein, mechanically stable ionic liquid-based pore-filling anion-exchange membranes (PFAEMs) with excellent transport performance for large-sized metallic anions were fabricated by impregnating porous polytetrafluoroethylene with ionic liquid (IL) tricapryl(methyl) ammonium chloride, poly(ethylene glycol) dimethacrylate and poly(vinylidene fluoride-co-hexafluoropropylene). The superior compatibility between the ILs and polymeric chains ensured the stable existence of quaternary ammonium groups, thus enabling fast metallic anion migration along the continuous pathway in the membrane matrix at a low current density. The prepared PFAEM exhibited a dramatically greater flux of HCrO 4 − (90.7 μmol m −2 s −1 ), which was 9.5 and 4.4 times higher than the flagship commercial Neosepta@ASE and Neosepta@AMX membranes, respectively. The area resistance of PFAEM (3.4 Ω cm 2 ) was found to be 3.4 and 2.0 times lower than those of the Neosepta@ASE and Neosepta@AMX membranes, respectively. Besides, the preeminent transport performance of PFAEM to other metal coordination anions revealed the universality of the prepared membrane. Moreover, the extremely high limiting current density and satisfactory long-term stability of PFAEM manifested bright prospects for realizing efficient metal separation in industrial-scale applications.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 11
·2385-2392
·
IF 7.804
Xueping Liu,Jiang He,Pengfei Wang,Yuhao Liu,Junyan Xiao,Zhiliang Ku,Yong Peng,Fuzhi Huang,Yi-Bing Cheng,Jie Zhong
Graphical Perovskite solar cells : Perovskite with trace doping of 0.01 % tert -butylammonium iodide preserves its excellent optoelectronic properties, leading to a high power conversion efficiency (PCE) of 19.3 % and a high fill factor of 0.8. High-efficiency perovskite solar cells are fabricated under a high-humidity environment of 50 % relative humidity (RH); these cells realize good humidity and heat stabilities. Solution-processed organic–inorganic lead halide perovskites have shown photovoltaic performance above 23 %, attracting great attention. However, the champion devices require fabrication in a controlled inert/dry atmosphere. The development of highly efficient and stable perovskite solar cells under high-humidity atmosphere conditions for future commercialization is still challenging, especially for CH 3 NH 3 PbI 3 (MAPbI 3 ), which is vulnerable to moisture. In this study, a large-sized tert -butylammonium [C(CH 3 ) 3 NH 3 + ] organic cation was incorporated into the MAPbI 3 crystalline structure, which could form a more stable 3 D crystalline structure and alleviate the decomposition caused by the humidity. It delivered a power conversion efficiency of 19.3 % upon preparation under a humid environment condition of 50 % relative humidity as well as improved humidity and thermal stability. Our work provides a facile strategy for improving perovskite performance and stability by introducing a new chemical additive for the future application of perovskite solar cells.
研究领域:
材料科学
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能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2015
·Vol. 27
·期 35
·5176-5183
·
IF 17.493
Liu Y,Yang Z,Cui D,Ren X,Sun J,Liu X,Zhang J,Wei Q,Fan H,Yu F,Zhang X,Zhao C,Liu SF.
Two-inch-sized perovskite crystals, CH3 NH3 PbX3 (X=I, Br, Cl), with high crystalline quality are prepared by a solution-grown strategy. The availability of large perovskite crystals is expected to transform its broad applications in photovoltaics, optoelectronics, lasers, photodetectors, LEDs, etc., just as crystalline silicon has done in revolutionizing the modern electronics and photovoltaic industries.
研究领域:
材料科学
·
光电子学
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光伏技术
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晶体生长
·
半导体物理
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Tao Long,Yin Xu,Xiaojian Lv,Jingwen Ran,Shuibin Yang,Lanying Xu
A facile one pot method has been applied to fabricate large-sized freestanding titania-silica monolithic aerogels (TSMA). The obtained TSMA was characterized by scanning electron micrograph (SEM), Energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and nitrogen adsorption measurements. SEM results show the TSMA has bicontinuous inner structure and large macropores (through-pores), which are favorable for the liquid infiltration. XRD results demonstrate the TSMA is anatase and nitrogen adsorption results reveal its high specific surface area of 445.9 m 2 /g. To maximize the catalytic activity of the as-prepared TSMA, an annular photocatalytic reactor has been specially designed and fabricated. With the apparatus, the as-prepared TSMA exhibited outstanding catalytic performance, which degraded glyphosate completely within 180 min of photocatalytic reaction. The kinetic rate (k value) of the photocatalytic reaction reaches 0.0242 min −1 . Ion chromatography results indicate that glyphosate was mainly mineralized to inorganic ions such as PO 4 3− and NO 3 − , etc.
研究领域:
环境化学
·
材料科学
·
催化化学
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水处理技术
·
纳米材料应用
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 23
·4026-4032
·
IF 7.411
Li Ma,Qiuming Gao,Weiqian Tian,Qiang Zhang,Hong Xiao,Zeyu Li,Hang Zhang,Xuehui Tian
Large-sized reduced graphene oxide prepared was prepared by combined microwave intermittent heating and an extraction process (e.g., 900 W for 10 min (MRG-900-10)) with a lateral size of several micrometers and a thickness of 4–6 monosheets . The MRG-900-10 has a high C/O molar ratio (5.89) and a sp 2 C content of 69.0 %, which leads to a fast electronic transmission in the sample. In addition, MRG-900-10 possesses a large specific surface area of 568.2 m 2 g −1 , which increases the contact surface area between the active material and the electrolyte, thus enhancing the electron and ion transport in the interfaces when used as the electrode material in supercapacitors. MRG-900-10 possesses a low charge-transfer resistance (≈0.36 Ω). Used as the electrode material for a supercapacitor in 6 m KOH aqueous electrolyte, MRG-900-10 produces a high specific capacity of 327.6 F g −1 at the current density of 0.5 A g −1 . A specific capacity of 248.3 F g −1 was obtained at a high current density of 100 A g −1 , which indicated its high-rate ability. The initial capacity of 92 % can be maintained after 40 000 cycles at 5 A g −1 , which indicated its high cycling stability. As for the MRG-900-10 symmetric supercapacitors, the energy densities of 11.0 and 36.2 Wh kg −1 were obtained in 6 m KOH aqueous and 1 m tetraethylammonium tetrafluoroborate ([TEA]BF 4 )/acetonitrile (ACN) electrolytes, respectively. Importantly, a high energy density of 68.6 Wh kg −1 was achieved in the nonflammable ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethane)sulfonimide ([EMIM][TFSI])/ACN (80 vol % [EMIM][TFSI]), and the supercapacitor was effective from room temperature to 100 °C. Graphical Size matters ! A large-sized reduced graphene oxide-based material with a low charge-transfer resistance has been prepared for use as an electrode in an ionic-liquid-based supercapacitor. A supercapacitor using an optimized electrolyte based on the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethane)sulfonimide has a high energy density and is nonflammable and stable at high temperature (see figure).
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）