NPG Asia Materials
·
2022
·Vol. 14
·期 1
·1-12
·
IF 10.761
Shi Tongyu,Chen Xi,Deng Yuhao,Huang Hao,Wang Jiahong,He Rui,Liu Yanliang,He Xingchen,Li Jia,Chu Paul K.,Yu Xue-Feng
A novel chemical vapor method is developed to synthesize ultrastable lead halide perovskite-zeolite (ZSM-5) composites, in which CsPbX 3 (X = Cl, Br, I) perovskite quantum dots (QDs) are grown in situ in the nanopores of the ZSM-5 substrate. The key chemical reaction between PbBr 2 vapor and the Si–O network in ZSM-5 leads to collapse of the initial zeolite crystal structure, realizing effective confinement and encapsulation of CsPbBr 3 QDs and boosting their stability under harsh conditions, including heat, water, polar solvents, and ultraviolet (UV) light. At the same time, the acquired encapsulation structure possesses the channels needed for halogen exchange to regulate the halide ratios of the CsPbX 3 -ZSM-5 composites. The synthesized CsPbX 3 -ZSM-5 composites exhibit tunable emission from 400 to 700 nm and narrow full-widths at half-maximum (FWHM). To demonstrate the commercial potential, CsPbX 3 -ZSM-5 composites synthesized on a large scale are applied in white light-emitting diodes (WLEDs) and multicolor-coded anti-counterfeiting inks.
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
Materials
·
2015
·Vol. 8
·期 4
·1369-1383
·
IF 2.651
Lei Zu,Xiuguo Cui,Yanhua Jiang,Zhongkai Hu,Huiqin Lian,Yang Liu,Yushun Jin,Yan Li,Xiaodong Wang
Mesoporous polyaniline-silica nanocomposites with a full interpenetrating structure for pseudocapacitors were synthesized via the vapor phase approach. The morphology and structure of the nanocomposites were deeply investigated by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis and nitrogen adsorption-desorption tests. The results present that the mesoporous nanocomposites possess a uniform particle morphology and full interpenetrating structure, leading to a continuous conductive polyaniline network with a large specific surface area. The electrochemical performances of the nanocomposites were tested in a mixed solution of sulfuric acid and potassium iodide. With the merits of a large specific surface area and suitable pore size distribution, the nanocomposite showed a large specific capacitance (1702.68 farad (F)/g) due to its higher utilization of the active material. This amazing value is almost three-times larger than that of bulk polyaniline when the same mass of active material was used.Keywords:polyaniline;mesoporous silica;nanocomposites;vapor phase approach;specific capacitance
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Shunyong Wei,Ming Yang,Hui Sun,Faming Li,Fei Xiao,Jihua Zou,Aobo Ren,Yixuan Huang,Zhihui Xiong,Liming Yuan,Hao Xu,Tixian Zeng,Jiang Wu,Zhiming M. Wang
CdSe single crystals (SCs), with a relatively high atomic number, large X-ray absorption coefficients, and high carrier mobility, are expected to provide high-performance detection for X-ray. However, the difficulty of growing high-quality CdSe SC has severely limited its application in X-ray detection. In this work, we develop an unconstrained physical gas phase method and in situ annealing process to grow high-quality CdSe SCs under unconstrained conditions. Using this method, CdSe SCs exhibit natural exposure planes, ultrahigh resistivity of 5.43 × 1012 to 1.29 × 1013 Ω cm and high μτ product of 1.3 × 10–2 to 1.5 × 10–2 cm2 V–1. It is also observed that CdSe SC X-ray detectors exhibit a record sensitivity of 2.08 × 105 μC Gyair–1 cm–2 and a low detection limit of 85 nGyair s–1, which are both desired in medical diagnostics. Moreover, those devices with different crystal directions provide anisotropic X-ray detection performance. Our findings pave a new avenue to exploit high-performance CdSe SC X-ray detectors.
研究领域:
材料科学
·
医学影像
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
E-POLYMERS
·
2021
·Vol. 21
·期 1
·131-139
·
IF 2.025
Zhengwei Peng,Yan Qin,Jiuqiang Song,Di Zhu,Shuisheng Chen,Jingwen Ren,ZhuangZhuang Li,Zhenyue Zou
The term “structuring” used in silicone rubber describes a phenomenon of the increase in the viscosity of polydimethylsiloxane filled with silica during storage, which limits the applications of the room temperature vulcanized (RTV) silicone rubber in the field of aerospace and military. In this pursuit, the present study was envisaged to solve the problem of structuring of the RTV. A solvent-free method was used to hydrophobize the hydrophilic silica with hexamethyldisilazane. An RTV composition prepared using eight parts of hydrophobic silica with 2.91% C content exhibited a viscosity of less than 100 Pa s, with no significant change in 21 days. In contrast, eight parts of the hydrophilic fumed silica showed an initial viscosity of RTV to be greater than 2,000 Pa s. Silica samples with different adsorbed water content were used to prepare the RTV compositions. It was found that the viscosity of the RTV prepared using the sufficiently dried silica was 5.6 times lower than that of the wet silica. The “dissolution” model of the silica–silica hydrogen bonds in water was proposed. Furthermore, the change in the viscosity of the RTV compositions at different temperatures in the range of −15°C to 30°C was studied. The viscosity of RTV stored at –15°C for 34 days did not change significantly, whereas that stored at room temperature increased from 100 to 1,710 Pa s within 21 days.
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
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2011
·
IF 1.384
Chuanyi Tao,Xueming Li,Wenjing Yang
Hook-shaped and straight silica wires have been successfully synthesized on silicon wafer through a simple thermal vapor method with or without assistance of Al , respectively. The hook-shaped silica wires have amorphous structures with nearly 100 μm long and about 4 μm in average diameters, while the straight silica wires are hundreds of micrometers long and approximately 50–300 nm in diameters. The composition analysis revealed that larger Al/SiO x islands can form on the silicon substrate with Al catalysts, whereas tiny silica clusters form without Al catalysts. They could act as the nucleation centers for the growth of silica wires with different shapes. The formation process of hook-shaped silica microwire results from a thermal gradient on the silicon substrate. The thermal gradient may be caused by the cold gas flowing during the process or other factors that lead to uneven temperature. On the contrary, straight growth of silica submicrowire is unacted on the thermal gradient factor due to the tiny silica clusters as nucleation centers. The present simple and low-cost process of producing hook-shaped and straight silica wires in bulk may lead to potential applications in catalysts, electrode materials, biosensing, etc.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Qingxu Zhang,Huilong Xu,Yihu Song,Qiang Zheng
Hydroxyl-terminated polybutadiene (HTPB) liquid is used to mediate the dispersity of fumed silica in cis -polybutadiene rubber (BR) to prepare nanocomposites. The introduction of HTPB promotes the dispersion of both hydrophilic and hydrophobic silicas (A200 and R974), which improves the reinforcement efficiency, delays the onset strain amplitude of nonlinear softening and enlarges the high-order harmonics in the nonlinearity region. Influence of HTPB on the linear and nonlinear rheological responses are well accounted for by data superposition on the basis of the rheological responses of the matrix. It is evidenced for the first time that the rheological nonlinearity may be enhanced in the case of improved filler dispersity. This is understandable taking the intrinsic nonlinearity of the matrix and the strain amplification effect induced by filler into consideration.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 4
·1332-1339
·
IF 6.8
Zhang Shunyao,Wang Lukai,Feng Junzong,Jiang Yonggang,Li Liangjun,Hu Yijie,Feng Jian
Silica aerogels exhibit considerable potential for thermal insulation applications owing to their low thermal conductivity. However, they generally possess poor mechanical properties and need to be mechanically enhanced while maintaining their low thermal conductivity. In this study, commercial fumed silica and methyltrimethoxysilane were used as the silica sources and water and ethanol were used as solvents to form a slurry. Consequently, silica aerogel monoliths (SAMs) were prepared through ambient drying without additional surface modification or solvent replacement. The resulting SAM maintained a typical nanopore structure and exhibited low density (0.24 g cm −3 ), shrinkage (4%), and thermal conductivity (0.046 W m −1 K −1 ). The slurry was impregnated with fiber blankets via roller pressing, and silica aerogel blankets (SABs) were prepared through thermal solidification of the slurry and ambient drying. The prepared SABs exhibited good flexibility and mechanical properties, facilitating their installation and application for thermal insulation and considerably reducing production cycles and costs. In addition, controlling the particle size and mass fraction of opacifiers decreased the high-temperature thermal conductivities of SABs owing to the nanopore structure and low shrinkage of SAMs, and the thermal conductivity of the optimized SAB at 800°C was as low as 0.054 W m −1 K −1 .
研究领域:
材料科学
·
纳米技术
·
热工学
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）