JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 15
·6627-6643
·
IF 3.5
Zheng Dawei,Zhu Yingming,Wu Kejing,Liu Shengqiang,Fu Pengcheng,Lu Houfang,Liang Bin
Polymeric thermal insulation materials, especially polyurethane foams (PUF), are widely used in buildings to diminish the energy penalty but highly flammable. To reduce the flammability and smoke release of polyurethane foams without sacrificing the inherent properties, we report an efficient strategy involving pulsed chemical vapor deposition (Pulsed-CVD) and spray atomization to generate a phosphorous/SiO 2 nanolayer with a thickness below 200 nm on polydopamine modified rigid polyurethane foams. Due to the unique multilayers structure, the resultant composites showed an extra-ordinary thermal conductivity of 31.9 mW m −1 K −1 and enhanced compressive strength of 42%. Notably, the surface-treated PUF was hard to ignite in vertical test and had a very high limited oxygen index (LOI) value of 34.3%. Cone calorimetry (CC) results revealed that the total heat release (THR) and the total smoke release (TSR) were reduced by 32.9% and 64.3%, respectively. And the close-cell char structure was perfectly retained after CC test. The mechanism research suggested that silica and phosphorus promoted char formation, limited heat release and thermal degradation during combustion. These results indicate the strategy with a mild process has potential for industrialization with superior fire safety and structure stability in polymeric insulation materials. Graphical abstract The polydopamine (PDA)-coated commercial polyurethane foam was treated through the pulsed-CVD and spray atomization strategy, the surface was decorated with flame retardant layers, and the flame and fumes were efficiently suppressed by instant char-forming and dense surface carbon barrier without sacrificing its inherent properties.
研究领域:
材料科学
·
防火材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 145
·期 8
·
IF 2.894
Hao Song,Yang Bingchu,Gao Yongli
The presence of grain boundaries is inevitable for chemical vapor deposition (CVD)-grown MoS 2 domains owing to various merging behaviors, which greatly limits its potential applications in novel electronic and optoelectronic devices. It is therefore of great significance to unravel the merging behaviors of the synthesized polygon shape MoS 2 domains. Here we provide systematic investigations of merging behaviors and electrostatic properties of CVD-grown polycrystalline MoS 2 crystals by multiple means. Morphological results exhibit various polygon shape features, ascribed to polycrystalline crystals merged with triangle shape MoS 2 single crystals. The thickness of triangle and polygon shape MoS 2 crystals is identical manifested by Raman intensity and peak position mappings. Three merging behaviors are proposed to illustrate the formation mechanisms of observed various polygon shaped MoS 2 crystals. The combined photoemission electron microscopy and kelvin probe force microscopy results reveal that the surface potential of perfect merged crystals is identical, which has an important implication for fabricating MoS 2 -based devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
ChemNanoMat
·
2021
·Vol. 7
·期 3
·323-327
·
IF 3.154
Yuxi Guo,Lixing Kang,Shaojia Yu,Jiefu Yang,Xiaofei Qi,Zhiyong Zhang,Zheng Liu
Graphical Large-scale 2D CrTe nanoflakes with a size of ∼250 μm were successfully synthesized via a chemical vapor deposition process, which used mixed compounds (Cr: CrCl 3 ⋅ 6H 2 O: Te) as Cr source and excessive Te in the upstream as Te source. The Te in the mixed compounds decreases the melting point of the mixed compounds and promotes the nucleation and growth of CrTe nanoplates, which leads to large-scale growth of CrTe nanoflakes. Recently, 2D magnetic materials have attracted much attention due to their potential applications in spintronic devices. Chromium telluride (CrTe) flakes have been reported for hard magnetism with a strong perpendicular anisotropy. However, the synthesis of large-scale CrTe nanoflakes on SiO 2 /Si substrate is still a challenge. Here, we report the synthesis of large-scale CrTe nanoflakes with a size of up to ∼250 μm on a SiO 2 /Si substrate via chemical vapor deposition (CVD). Our work demonstrated an effective pathway to synthesize large-scale 2D transition metal tellurides.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Guo Yu,Peilin Han,Hongmei Yi,Jiaxiang Zhao,Songjia Hou,Zuoyi Yan,Jie Liu,Haohong Li,Huidong Zheng,Caijin Zhou
The low efficiency of growing single-walled carbon nanotubes (SWCNT) poses a barrier to their application in high-performance electronic devices. However, it is difficult to control the uniform growth of SWCNT in a floating catalytic reactor due to the complex parameter control. Therefore, it is essential to enhance the growth of SWCNT in the floating catalyst chemical vapor deposition (FCCVD) process. In the present work, the influence of the reactive flow field on the growth of SWCNT, which is often neglected, is revealed. To address this issue, this work combines experiments and simulations to obtain the characteristics of the field distribution within the reactor and the trend of the products. The results of the flow field analysis indicate that thermal buoyancy is the cause of SWCNT growth limitation in FCCVD. By weakening the thermal buoyancy, a homogeneous reaction field is obtained; vortices in the flow field are reduced or even disappear; the temperature field is more homogeneous, and, importantly, the crystallinity of SWCNT is enhanced (I G /I D up to 20-fold). In addition, the decomposition process of the carbon source is also enhanced, thus suppressing the generation of by-products. Based on the results of the small tube experiments, both the increase in temperature and the decrease in residence time increased the I G /I D . Furthermore, the distributions of the maximum and minimum diameters in SWCNT imply variations in the growth modes of SWCNT at different temperatures.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Fangyuan Shen,Chunyan Chen,Wanxin Chen,Qian Liu,Chunlin Chen,Guoqing Xiao,Yuheng Liu,Jian Zhou
Nowadays, oil pollution of water caused by illegal discharges or accidental events occurs frequently, and the waste of resources and environmental pollution cannot be ignored, so effective oil–water separation methods are needed to cope with such incidents. To solve these problems, this paper investigated an aerogel made from a plant polysaccharide, konjac glucomannan (KGM), supplemented with graphene oxide (GO), to improve the mechanical properties. Finally, a hydrophobic layer was attached to the surface and interior of the aerogel via chemical vapor deposition to improve its selectivity toward oil. Through a series of characterization methods such as infrared, X-ray photoelectron spectroscopy, and X-ray diffraction, it was demonstrated that KGM and GO were successfully cross-linked, resulting in excellent mechanical properties and directional absorption properties on oil. This composite polysaccharide aerogel could absorb oil 48 times its own weight. In addition, due to its strong mechanical properties, the gel can be reused many times, and the maximum recovery rate can be maintained at 96% after 10 cycles. Furthermore, the absorption of oil from water was conducted in a continuous mode, demonstrating the diversity of application scenarios. Generally, the results observed in this work have shown that the KGM aerogels have great potential for applications in oil–water separation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Nano Research
·
2019
·Vol. 12
·期 4
·823-827
·
IF 8.515
Yang Peng,Yang Ai-Guo,Chen Lingxiu,Chen Jing,Zhang Youwei,Wang Haomin,Hu Laigui,Zhang Rong-Jun,Liu Ran,Qu Xin-Ping,Qiu Zhi-Jun,Cong Chunxiao
Chemical vapor deposition (CVD) is the most efficient method to grow large-area two dimensional (2D) transition metal dichiacogenides (TMDCs) in high quality. Monolayer molybdenum disulfide (MoS 2 ) and seed-assistant are the mostly selected 2D TMDC and growth strategy for such CVD processes, respectively. Though the advantages of seed catalysts in facilitating the nucleation, achieving higher yield and better repeatability, as well as their effects on the morphologies of as-grown MoS 2 have been studied, the influence of seeding promoters on both optical and electrical properties of as-grown monolayer MoS 2 is not known comprehensively, which is indeed critical for understanding fundamental physics and developing practical application of such emerging 2D semiconductors. In this report, we systematically investigated the effect of different seeding promoters on the properties of CVD-grown monolayer MoS 2 . It is found that different seed molecules lead to different impacts on the optical and electrical properties of as-grown monolayer MoS 2 . Among three different seed catalysts (perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS), copper phthalocyanine (CuPc), and crystal violet (CV)), PTAS performs better in obtaining large area monolayer MoS 2 with good optical quality and high electrical mobility than the other two. Our work gives a guide for modifying the properties of as-grown monolayer MoS 2 and other 2D transition metal dichalcogenides in seeding promoters-assisted synthesis process.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zihao Guo,Jinhui Liu,Xu Han,Fangyuan Ma,Dongke Rong,Jianyu Du,Yehua Yang,Tianlin Wang,Gengwei Li,Yuan Huang,Jie Xing
High-performance artificial synaptic devices with rich functions are highly desired for the development of an advanced brain-like neuromorphic system. Here, we prepare synaptic devices based on a CVD-grown WSe2 flake, which has an unusual morphology of nested triangles. The WSe2 transistor exhibits robust synaptic behaviors such as excitatory postsynaptic current, paired-pulse facilitation, short-time plasticity, and long-time plasticity. Furthermore, due to its high sensitivity to light illumination, the WSe2 transistor exhibits excellent light-dosage-dependent and light wavelength-dependent plasticity, which endow the synaptic device with more intelligent learning and memory functions. In addition, WSe2 optoelectronic synapses can mimic “learning experience” behavior and associative learning behavior like the brain. An artificial neural network is simulated for pattern recognition of hand-written digital images in the MNIST data set and the best recognition accuracy could reach 92.9% based on weight updating training of our WSe2 device. Detailed surface potential analysis and PL characterization reveal that the intrinsic defects generated in growth are dominantly responsible for the controllable synaptic plasticity. Our work suggests that the CVD-grown WSe2 flake with intrinsic defects capable of robust trapping/de-trapping charges holds great application prospects in future high-performance neuromorphic computation.
研究领域:
神经形态工程
·
材料科学
·
光电子学
·
纳米技术
·
人工智能
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 38
·19626-19634
·
IF 5.1
Yunxiao Min,Jie Liu,Zihan Wang,Liang Li
Low-dimensional materials, particularly quasi-2D semiconductors like bismuth oxychalcogenides (BiOX), offer unique advantages for advanced photodetection due to van der Waals integration and quantum-confined properties. In this research, Bi2TeO5 nanosheets were successfully grown using a chemical vapor deposition method. The resulting Bi2TeO5 photodetector exhibited remarkable performance characteristics. Specifically, it demonstrated an open circuit voltage of −1.14 V, a depolarization field of 5.7 × 107 V m−1, a remarkably low dark current of 10−15 A, an impressive on/off ratio of 103, a responsivity of 466.80 mA W−1, a detectivity of 4.23 × 1012 Jones, and an EQE of 218.44% at 8 V bias. The work highlights the significant potential of Bi2TeO5 and provides new design strategies for developing next-generation 2D photodetectors.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 35
·期 3
·2413903
·
IF 18.5
Mengxin Yu,Yalin Zhai,Kai Xu,Ruijie Song,Peng Wan,Daning Shi,Caixia Kan,Xiaosheng Fang,Mingming Jiang
Low-dimensional ternary silver halide (CsAg 2 I 3 ), an emerging inorganic lead-free perovskite, has garnered significant scientific attention due to its strong quantum confinement effects, wide bandgaps, non-toxicity, and others. However, the photophysical properties and optoelectronic performance of CsAg 2 I 3 materials and devices are significantly compromised by crystal quality and defects arising from liquid-phase preparation. Herein, 1D CsAg 2 I 3 single crystals newly grown by the chemical vapor deposition method are reported. These crystals display exceptional quality and stability over a 3-month period despite exposure to air and moisture. The high in-plane anisotropic structure, phonon vibrations, and refractive index of CsAg 2 I 3 crystals are also experimentally elucidated. Polarization-sensitive ultraviolet photodetector based on the CsAg 2 I 3 monocrystal features a responsivity of 139 mA W −1 , a specific detectivity of 1.05 × 10 11 cm Hz 1/2 W −1 , an ultra-fast photoresponse speed of 48.2/69.1 µs, and a dichroic ratio of 2.66 upon 360 nm irradiation at −5.0 V bias. The photodetector excels amongst its competitors, moving toward the potential application of rapid optical anti-counterfeiting identification. This work, which leverages grown high-crystalline and highly stable CsAg 2 I 3 monocrystals, holds promises for advancing this functional material into a robust next-generation optoelectronic devices capable of probing sensitive optical sensing and specific azimuth recognition.
研究领域:
材料科学
·
光电子学
·
物理化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yan Cheng,Shanchi Wang,Zhiguang Xu,Lianyi Jiang,Yan Zhao
Oil-repellency of fabric is essentially based on perfluoroalkyl substances (PFAS, or called perfluorochemicals (PFCs)). However, plans to phase out the use of these chemicals, even those short-chain ones (C4-C6), have been announced because they accumulate in the human body and are extremely persistent in the environment. It is urgent to develop non-fluorine surface chemistry for oil-repellent fabric finishing. Here, we report the non-fluorine oil repellency of brush-like polydimethylsiloxane (PDMS) coating (g-PDMS), and the comparison of its oil repellency with that of a common PFAS crosslink polysiloxane coating (C 4 -PFAS). A catalyst-free, solvent-free chemical vapor deposition (CVD) process was used to prepare the g-PDMS coating. For smooth glass, g-PDMS coating exhibits ultralow contact angle hysteresis (∆ θ ) for various oils (1.3–7.3°), while the ∆ θ of C 4 -PFAS coating is much higher (30.7–49.7°). For fabrics, g-PDMS and C 4 -PFAS achieved almost the same contact angles to castor oil (~134°). According to GB/T 19977-2014 standard, the oil repellency of coated fabrics was rated Grade 5 for both g-PDMS and C 4 -PFAS. Therefore, the non-fluorine oil repellency of g-PDMS is able to meet the basic requirement of oil-repellent fabric finishing, and it is expected that the oil repellency can be further improved by the rational design on surface topography .
研究领域:
材料科学
·
化学工程
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Liru Zeng,Zeyulin Zhang,Dinghe Liu,Zhuangjie Xu,Dazheng Chen,Yue Peng,Qian Feng,Yachao Zhang,Jincheng Zhang,Chunfu Zhang,Yue Hao
The interfacial configuration in oxide heteroepitaxy plays a critical role in determining the structural integrity and reliable performance of wide-bandgap heterostructures. Herein, we investigate the orientation-dependent epitaxial growth of high-quality NiO films on β-Ga 2 O 3 via mist chemical vapor deposition (Mist-CVD), exhibiting distinct epitaxial domain configurations depending on the substrate orientation. Combined experimental and density functional theory (DFT) analyses reveal that the synergistic interplay among surface energy, lattice mismatch, and crystal symmetry governs the epitaxial mode and crystalline quality across different substrate orientations. Benefiting from the high-quality epitaxy, the NiO films demonstrate good environmental stability, retaining 94% of their initial current after 30 days of ambient exposure. As a functional demonstration, the NiO/(001) β-Ga 2 O 3 p-n diode exhibits a low leakage current density (2.08 ×10 −8 A·cm −2 @-100 V) and a high breakdown voltage of 885 V, highlighting the critical role of epitaxial interface quality. This study provides mechanistic insight into orientation-regulated oxide heteroepitaxy and offers a viable materials strategy for constructing stable wide-bandgap oxide heterostructures.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2026
·
IF 3.6
Ting Shu,Huafeng Wang,Juan Zhou,Xiongxiong Xue,Guolin Hao
Abstract Tin-based sulfides have attracted considerable interest because of their distinctive electronic structures and promising optoelectronic, photovoltaic, electrochemical, and photocatalytic properties. However, the phase-controlled synthesis of tin sulfides remains challenging because competing Sn−S phases can readily form during growth. In addition, the thermodynamic and kinetic factors governing phase evolution among tin sulfides are still not fully understood, which limits rational phase engineering and device-oriented optimization. Here, we report a facile chemical vapor deposition strategy using fluorine-doped tin oxide as an in situ tin source for the controllable growth of large-area SnS2 nanosheet arrays and Sn2S3 nanostructures. By tuning the growth temperature, sulfur precursor dosage, and reaction duration, SnS2 nanosheets can be transformed into Sn2S3 under sulfur-deficient, high-temperature conditions. The optimized window for pure Sn2S3 formation is 525 °C, 50 mg sulfur precursor, and 10 min growth duration, under sulfur-deficient Ar/H2 atmosphere. Comprehensive structural and chemical characterizations, together with Gibbs free-energy analysis and density functional theory calculations, suggest that sulfur vacancies play a key role in weakening Sn−S bonding and promoting lattice reconstruction. These results provide an experimentally accessible route for the phase-controlled synthesis of tin sulfides and offer mechanistic insight into vacancy-mediated phase transformation in two-dimensional metal chalcogenides.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）