CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zaichun Sun,Bingchu Mei,Hao Zhou,Shaoyong Qin,Huijuan Zhang
High-quality (001) orientated bismuth oxobromide (BiOBr) thin films were deposited on polycrystalline Sn: In 2 O 3 -glass substrates at open-air atmospheric pressure with mist chemical vapor deposition (CVD). Generally, it is difficult to control the surface morphology and thickness for BiOBr because of the high anisotropic crystal structure and very volatile halide . In this study, the growing thickness of BiOBr thin films showed a linear correlation with deposition time. Small thickness resulted in limited absorption ability, while large thickness led to increase of electrical resistance. The surface morphology of (001) orientated BiOBr thin films can be improved obviously under the acidic environment via suppressing Bi 3+ hydrolysis. The (001) orientated BiOBr thin films that deposited by mixed solvent of DMF and 35% HNO 3 aqueous solution exhibited the highest photocurrent density with 0.33 mA cm −2 at 0.6 V vs Ag/AgCl. The intermediate thickness and continuous surface morphology effectively promote the transfer and separation of electron-hole pairs, leading to superior photoelectrochemical (PEC) performance.
研究领域:
材料科学
·
光电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Shouxiang Jiang,Linghui Peng,Ronghui Guo,Dagang Miao,Songmin Shang,Jiangtao Xu,Aishu Li
Iron III oxide (Fe 2 O 3 ) nanoparticles were coated on quartz fabric by electron beam evaporation (EBE) and then annealed in a muffle furnace under air atmosphere at 800 °C for 5 h. The Fe 2 O 3 coated fabric is characterized by energy dispersive X-ray spectroscopy, X-ray diffraction and scanning electron microscopy. The thickness and color performance of the Fe 2 O 3 film on the quartz fabric were measured with a surface profiler and color spectrophotometer, respectively. It is found that an increase of electron beam currents from 20 mA to 60 mA results in an increase of color depth of the coated fabric. The color of the Fe 2 O 3 coated quartz fabric is reddish yellow and changes to red after annealing. The thickness of the Fe 2 O 3 film also increases with the rise of electron beam current.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 3
·684-690
·
IF 8.183
Wei Jing,Wang Xi,Sun Xiangyu,Yang Zhaofeng,Moreels Iwan,Xu Kun,Li Hongbo
Inorganic halide perovskites such as cesium lead iodide (CsPbI 3 ) have drawn tremendous attention, as their tunable band gaps are desirable for solar cells as well as light emitting diodes. However, due to their low Goldschmidt tolerance factor, the cubic phase of bulk CsPbX 3 —the variant with desirable band gap—is not stable in ambient, especially in humid air. Besides, the low solubility of CsX in precursor makes it difficult to control the film thickness and morphology of CsPbX 3 , which becomes another obstacle for the practical application of inorganic perovskite. Here, we report a polymer assisted deposition of high-quality CsPbI 2 Br film by spin-coating a polymer-blended CsPbI 2 Br precursor. The long-chained polymer increases the viscosity of the solution, which enables us to achieve a ca. 700-nm thick film with a low solution concentration of CsPbI 2 Br. Moreover, the polymer network helps to regulate the crystallization process and provides more crystallization sites for perovskite film, reducing grain size and thus improving the film coverage. Perovskite solar cells with the polymer network exhibit improved efficiency and reproducibility (0.72% standard deviation). Moreover, the device demonstrates excellent robustness against moisture and oxygen, and maintains 90% of its initial power conversion efficiency (PCEs) after aging 4 months in ambient conditions. The conception of polymer incorporation into inorganic perovskite films paves a way to further increase the performance, stability and reproducibility of inorganic perovskite devices.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
Lubricants
·
2024
·Vol. 12
·期 3
·67
·
IF 3.1
Qiaoni Xu,Zhaogang Jing,Shijie Du,Feng Guo,Ruitao Mu
Glyceryl monostearate (GMS) was used as an organic friction modifier (OFM) and added to the base oil (PAO10, polyα-olefin) in this study. The film thickness and friction coefficient of the base oil added with GMS (PAO10G) under different slider inclinations and loads were investigated experimentally by using a slider-on-disc contact lubricant film measurement system, and the effect of the adsorption of GMS on the friction behavior of lubricant was studied. Contact angle hysteresis (CAH) was used to evaluate the wettability of the solid–liquid interface, and its correlation with the coefficient of friction was analyzed. The results show that CAH is in good agreement with the wettability of the solid–liquid interface. Compared with the base oil, the wettability of POA10G is weak, which can effectively reduce the coefficient of friction. However, different from the classical lubrication theory, the film thickness of PAO10G is higher than that of PAO10; this unusual phenomenon is preliminarily explained by the interface slippage in this paper.
研究领域:
机械工程
·
表面科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxuan Zhou,Yueting Wang,Zehua Zhang,Fuwei Li,Jian Cheng,Yinghua Ye,Jianbing Xu,Ruiqi Shen
The application and optimization of nano-composite energetic materials in the extreme and particular environment have become a subject of wide concern. Additionally, the design and selection of metastable intermixed composites (MICs) films in low pressure environment is the key problem to explore its future application. Here, 90 wt% high loading Al/CuO nanothermite films were prepared by a simple 3D direct writing approach. Four films with different thicknesses (66, 128, 152, 182 μm) were designed and their combustion properties were tested respectively. The low pressure combustion results show that the self-sustained burning rate of the film (thicker than 66 μm) can be adjusted and controlled in various air pressure environments (101–60 kPa). The self-sustained burning rate of film is affected by both thickness (66–182 μm) and air pressure (101–60 kPa). The lower the air pressure, the lower the burning rate. The greater the thickness, the higher the burning rate. The 66 μm film self-sustainedly burns at atmospheric pressure and extinguishes when the pressure was significantly reduced. The self-sustained combustion rates of the 128 and 152 μm film decreases with decreasing pressure until the pressure drops to 75 and 60 kPa respectively. The 182 μm film keeps self-sustained combustion in a manner of deflagration which is almost unaffected by air pressure, even when the pressure drops to 10 kPa. Simultaneously, it is found that the ignition temperature of the film is almost not affected by pressure. In addition, it is verified that the film has performances of excellent hydrophobic and combustion through air–water interface. These can cope with complex environmental humidity.
研究领域:
材料科学
·
燃烧学
·
航空航天工程
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产品关联
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Ziyuan Zhou,Binghua Wang,Changyu Shen,Bin Zhang
Previous research studies on isotactic polypropylene (iPP) have shown that the ratio of growth rate β to α phase (Gβ/Gα) exceeds 1 when the crystallization temperature (Tc) is between the lower and upper critical temperature limits (Tc** ∼ 100 °C and Tc* ∼ 141 °C, respectively), due to the faster surface kinetics of β-iPP. However, in this work, we observed that when the film thickness (d) decreases from 24 to 9 nm, the temperature interval of Gβ/Gα > 1 narrows and even disappears, as Tc* gradually shifts to lower temperatures while Tc** remains constant. This is presumably because, as d decreases, the width (wd) of the depletion zone of β-iPP expands more significantly than that of α-iPP, resulting in slower diffusion toward the growth front of β-iPP. Consequently, Gβ decreases more than Gα as d diminishes, leading to a reduction in the value of Gβ/Gα, especially at higher Tc, where Gβ/Gα becomes less than 1. Moreover, we found that the diffusion activation energy (Eaβ) of β-iPP is consistently greater than that of α-iPP (Eaα) at a given d, and the gap between Eaα and Eaβ increases as d decreases. This further highlights that the slower diffusion process for β-iPP progressively becomes the main factor affecting the difference between Gα and Gβ as d diminishes.
研究领域:
材料科学
·
高分子物理
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 58
·47010-47021
·
IF 3.84
Gang Wu,Jinyang Li,Xue Qu,Yuxin Zhang,Hua Hong,Changsheng Liu
Precisely controlling the material structure is a high requirement for biological target imprinting. In situ surface imprinting immobilized templates can offer thin-film molecular imprints containing site-directed binding sites on substrates, and therefore is appropriate for biological targets. However, the correlation between the required film thickness for superior imprinting effect and the bulk structure of biological template is not clearly understood. Here we use a series of glycoprotein imprinted films as a model to give a semi-quantitative description for their correlation. Glycoproteins with distinguished molecular sizes including ribonuclease B, glucose oxidase and horseradish peroxidase were used as templates. Covalently immobilizing glycoproteins was achieved by using m-aminophenylboronic acid modified SiO2 or Fe3O4 surface. Dopamine was polymerized onto this surface for glycoprotein imprinting. Varying polymerization time provided a series of thickness tunable imprinting films in nanometer-scale. The binding isotherm study for each glycoprotein imprints with different film thickness was performed. The optimal film thickness for the highest binding capacities and imprinting factors shows a positive correlation with its template size. The each optimized glycoprotein imprints can recognize their template in a simple or complex environment. These results suggest that the thickness of imprinted film should be tailored for matching the geometric size of fixed templates, and reveal the substantial influence of template structure on imprints design.
研究领域:
材料科学
·
生物技术
·
表面化学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 35
·23770-23782
·
IF 3.3
Meina Yu,Jianjun Xu,Luoning Zhang,Qian Wang,Cheng Zou,Yanzi Gao,Huai Yang
As a type of smart dimming film, polymer-dispersed liquid crystals (PDLCs) show great prospects in the fields of indoor partition, electronic curtains, and automobile windows. However, its high off-axis haze greatly impacts the application scope. This obvious shortcoming is mainly caused by the serious mismatch between the effective refractive index of the liquid crystal (neff) and the refractive index of the polymer matrix (np) at large viewing angles. Thereby, factors affecting the viewing angle of a PDLC film are analyzed in this research, including the birefringence of the liquid crystal (Δn), film thickness, and the refractive index of the polymer matrix (np). Balanced electro-optical properties are guaranteed simultaneously. It is found that high on-state transmittance and low off-axis haze can be achieved at large viewing angles in the suggested optimized case where Δn is within the range of 0.1–0.13; the film thickness is between 20 μm and 15 μm; and np approaches no but the difference does not exceed 0.03.
研究领域:
材料科学
·
光学
·
电光技术
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产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Wei Liu,Zuyang Zhang,Daoyin Liu
SiO 2 /TiO 2 core/shell particles are effective photocatalysts, whose performance strongly depends on TiO 2 film thicknesses. Fluidized bed atomic layer deposition (FBALD) can precisely control film thickness at the sub-nanometer scale. In this work, TiO 2 films with different thicknesses are deposited on SiO 2 particles via different ALD cycles at 180 °C in a fluidized bed reactor. TEM images indicate that complete and uniform nanoscale TiO 2 films (0.7–6.4 nm, corresponding to 5–50 ALD cycles) are formed on SiO 2 surface. The TiO 2 film with about 3.9 nm is found to exhibit the highest photocatalytic characteristics by degrading rhodamine-B (RhB) and tetracycline (TC), and the photocatalytic activity is further maintained above 90% after 6 cycles of photocatalytic reaction. Suitable TiO 2 film thickness shows minimal charge transfer resistance, resulting in enhanced photon adsorption and separation of electrons and holes, thus improving photocatalytic performance. This work provides an effective way to tune the photocatalytic performance via FBALD.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Jianquan Xu,Chao Lv,Binyang Du,Xinping Wang,Ophelia K. C. Tsui
We show that the thickness, h0, dependence of the effective viscosity, ηeff(h0), of unentangled random copolymer films of styrene (St) and 4-methoxystyrene (MeOS) supported by silica (SiOx) can be easily tuned by tuning the MeOS concentration, XMeOS, in the copolymer. When XMeOS is increased from 0% to 100%, ηeff(h0) changes steadily from suppressed to enhanced with decreasing film thickness. At XMeOS = 10%, ηeff(h0) displays a nonmonotonic variation. Results obtained by fitting a three-layer model to the ηeff(h0) data show that ηeff(h0) of the XMeOS = 0% film was dominated by the mobility-enhancing effect of the free surface, but as XMeOS increases, the mobility-slowing effect of the substrate surface increases and dominates. The results also show that the propagation distance, lt, of the substrate effect increases with increasing XMeOS and is ∼2.6 to 6 times the radius of gyration of the polymer. We tentatively suggest the long propagation distances to be caused by the long-range van der Waals interactions. Analysis of the van der Waals interfacial potentials of the films supports this interpretation.
研究领域:
高分子物理
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
C.B. Song,Y.L. Zhao,D.M. Song,L. Zhu,X.Q. Gu,Y.H. Qiang
Dye-sensitized solar cells (DSSCs) based on TiO2 nanotube/nanoparticle (NT/NP) photoanodes and Cu2SnSe3 (CTSe) counter electrodes were fabricated. The effect of the thickness of the CTSe films on the DSSC performance was investigated. It was found that DSSC efficiencies firstly increased and then decreased with increasing the film thickness. The optimized DSSC efficiency of 3.14% was achieved at a suitable film thickness (2.9 μm). This work presents a new approach for developing low-cost alternative for expensive Pt in TiO2-nanotube-based DSSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Jiang Cheng,Zhen Zhang,Minghao Zhao,Youwei Guan,Xihao Chen,Xiang Meng,Hua Tang,Lu Li,Shenghao Wang
CdS films prepared via chemical bath deposition exhibit extremely good performance as a buffer layer of chalcogenide solar cells. However, their commercial application is very limited because of the production of a large amount of wastewater containing cadmium. In this study, we develop an efficient way to prepare CdS films using the spin-coating technique. The spin solution is anhydrous, and the oxygen content can be well controlled by changing the Cd/S content ratio in the solution. The crystal structure, morphology, and optical and electrical properties of CdS films with different Cd/S content ratios are characterized. The effect of the oxygen content on the device performance is investigated. We find that the introduction of an appropriate amount of oxygen can improve the carrier transport efficiency by decreasing the interface recombination. The spin-coated CdS films have good coverage of the substrate for film thicknesses below 50 nm. By the optimizing of Cd/S content ratio, we achieve an improved efficiency of 5.76% for the Sb 2 Se 3 solar cells. This preparation technique is sufficiently simple for large-scale processing and produces much less wastewater containing cadmium; thus, it is promising for application to future large-scale solar cell production.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）