MOLECULES
·
2021
·Vol. 26
·期 13
·4079
·
IF 4.412
Gaozhan Xie,Jiangchao Wang,Yang Cao,Xudong Xue,Xiao Zhang,Chang Liu,Huanhuan Li,Ye Tao,Runfeng Chen
Three phosphine sulfide-based bipolar host materials,vizCzPhPS,DCzPhPS, andTCzPhPS, were facilely prepared through a one-pot synthesis in excellent yields. The developed hosts exhibit superior thermal stabilities with the decomposition temperatures (Td) all exceeding 350 °C and the melting temperatures (Tm) over 200 °C. In addition, their triplet energy (ET) levels are estimated to be higher than 3.0 eV, illustrating that they are applicable to serve as hosts for blue phosphorescent organic light-emitting diodes (PhOLEDs). The maxima luminance, current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE) of 17,223 cd m−2, 36.7 cd A−1, 37.5 lm W−1, and 17.5% are achieved for the blue PhOLEDs hosted byCzPhPS. The PhOLEDs based onDCzPhPSandTCzPhPSshow inferior device performance than that ofCzPhPS, which might be ascribed to the deteriorated charge transporting balance as the increased number of the constructed carbazole units inDCzPhPSandTCzPhPSmolecules would enhance the hole-transporting ability of the devices to a large extent. Our study demonstrates that the bipolar hosts derived from phosphine sulfide have enormous potential applications in blue PhOLEDs, and the quantity of donors should be well controlled to exploit highly efficient phosphine sulfide-based hosts.Keywords:bipolar host material;phosphorescent organic light-emitting diode;phosphine sulfide;carbazole;triplet energy level
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Journal of Biobased Materials and Bioenergy
·
2021
·Vol. 15
·期 4
·514-520
·
IF 0.708
Wang Xiaobin
The penetration depth of light into wheat flour is the basis for the effective detection of additives in wheat flour using hyperspectral imaging. To determine the effective penetration depth of light into different gluten flours in hyperspectral image collection, the partial least squares-discriminant
analysis (PLS-DA) method was used. Double-layer samples were prepared by placing flour layers with different thicknesses on top of the benzoyl peroxide (BPO) layer. PLS-DA classification model was established by using the diffuse reflectance spectra of each pixel in the double-layer sample
image, and the classification accuracy was used to evaluate the results. The results show that the average accuracy of 1 and 1.5 mm models after smoothing pretreatment is above 95%. Therefore, a 1.5 mm sample depth for the detection of mixed samples of flour and additives is recommended. The
selected sample depth was used for the detection of mixed samples containing different concentrations of BPO in flour, and the percentage of detected BPO pixels was positively correlated with BPO concentration, which could be used for subsequent quantitative analysis. The results lay a foundation
for the effective detection additives in wheat flour by using hyperspectral imaging technology.
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CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Ziyan Wu,Qiqi Zhang,Binghan Li,Zhifang Shi,Kaimin Xu,Yi Chen,Zhijun Ning,Qixi Mi
All-inorganic metal halide perovskites are noted for their excellent optoelectronic properties and good chemical stability but also a propensity to transform into nonperovskite phases. A case in point is lead-free CsSnCl3, whose perovskite Phase I is metastable at room temperature and could not be stabilized by partial substitution of Cs+ or Cl–. Judging from the radii of the constituent ions of CsSnCl3, we paid attention to octahedral cations smaller than Sn2+ and selected Mn2+ and In3+ for substitution at the B-site. A quantitative structural indicator, volume per formula unit (V/Z), guided the syntheses of CsSn0.9Mn0.1Cl3 (CTMC) and CsSn0.9In0.067Cl3 (CTIC), which are shown by single-crystal X-ray diffraction and differential scanning calorimetry to be homogeneous, stable perovskite phases at room temperature. CTMC turns into a disordered perovskite structure at 193 K, lower than the corresponding transition temperature of CsSnCl3 by nearly 100 K. Vacancies in CTIC result in a more flexible crystal structure than CTMC and CsSnCl3. CTMC and CTIC appear bright yellow with a steep absorption edge at ∼450 nm, and their photoluminescence peaks are located at 645 and 484 nm, respectively, with intensities significantly enhanced from CsSnCl3. Energy transfer processes are proposed to account for the Stokes shifts in the photoluminescence of CTMC and CTIC. Thin films of CTMC glow red under ultraviolet excitation and hold promise for electroluminescence devices. This study gives insights into the structural and electronic effects of ionic substitution in CsSnCl3 and can be extended to other metastable perovskite phases.
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Nanoscale
·
2019
·Vol. 11
·期 28
·13521-13531
·
IF 6.97
Nan Pan,Juanrong Qin,Pingping Feng,Botao Song
Fibrous materials with high light transmittance exhibit great potential in a wide range of applications; unfortunately, fabrication of such materials still remains a challenge due to the strong light scattering caused by the rough fibrous structure and the voids between fibers. Window screens are commonly used in our daily life, and their unique woven structure ensures excellent mechanical properties, while the voids between wires allow light to pass through. By learning from the architecture of window screens, we proposed a novel patterned electrospinning approach with window screen like wire meshes as collectors to deposit fibers with anisotropic thickness gradients and further to improve the optical properties. The results indicated that the obtained fibrous mats closely copied the structure of the wire meshes, and exhibited unique thickness anisotropy with most of the fibers densely packed on the wires in a small area, while very few fibers sparsely suspended in the voids over a large area. Owing to the large area of the thin region within fibrous mats, the overall light transmittance of such a well-organized mat was greatly improved as compared with that of an isotropous mat. Furthermore, by carefully investigating the microstructure of the fibrous mats and simulating the electric field distribution with the software Comsol Multiphysics, a novel needle array collector with an ultra large area of voids was designed to achieve optimal light transparency. Finally, as proof of concepts, we investigated the potential use of transparent fibrous mats as a visual wound dressing and a window dust filter, respectively.
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RSC Advances
·
2019
·Vol. 9
·期 39
·22559-22566
·
IF 3.049
Hao Chen,Changteng Zhang,Ya Pang,Qianhong Shen,Yang Yu,Yuxuan Su,Jiabang Wang,Fang Zhang,Hui Yang
Novel Nb-doped Bi2WO6 nanosheets have been successfully synthesized by a simple hydrothermal method. XRD, Raman spectra, XPS and SEM were adopted to analyze the structure and morphology of the samples, then the structure-dependent optical properties, photoelectric behavior and photocatalytic activities were investigated, and the structure–property relationship was also discussed. The results show that doping Nb5+ can increase the oxygen vacancies in the Bi2WO6 lattice and reduce the optical band gap of Bi2WO6. The oxygen vacancies also act as electron traps, which promote the separation of photogenerated carriers. Hence, compared with the pure Bi2WO6, the as-prepared Nb-doped Bi2WO6 nanosheets exhibit enhanced visible-light photocatalytic activity for removing contaminants in water such as rhodamine B and tetracycline.
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JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 122
·期 17
·
IF 2.068
Tong Liping,Saito Katsuhiko,Guo Qixin,Zhou Han,Fan Tongxiang,Zhang Di
Visible-light-activated near-infrared luminescent materials are promising photoluminescent materials due to their convenience and low cost. Crystal defects can seriously affect the performance of luminescent materials, and better understanding of the complexity of the structural disorder and electronic structures of such materials opens up new possibilities in luminescent material development. In this work, we successfully design a novel, effective, visible-light-activated near-infrared luminescent Gd 3 Ga 5 O 12 : 4.2%Yb 3+ , 8.4%Er 3+ , and 4.2%Bi 3+ system based on first principles. This exhibits strong emission intensity and high luminous efficiency (0.993) and also has a lifetime (7.002 ms) that is at least twice as long as the longest lifetime reported in published papers. We utilize density functional theory with an effective LSDA + U method to study the structural properties of Gd 3− x − y − z Ga 5 O 12 : x Yb 3+ , y Bi 3+ , z Er 3+ (GGG: Yb 3+ , Bi 3+ , Er 3+ ). The d and f electron orbits of rare-earth ions are considered for an effective Hund exchange. Detailed analysis reveals that GGG: 4.2%Yb 3+ , 8.4%Er 3+ , 4.2%Bi 3+ has the smallest cell volume because of the strong covalent bonds of Bi–O, Er–O, and Yb–O. Bi 3d is a hybridized state that acts as sensitizing ions during the process of luminescence in GGG: Yb 3+ , Bi 3+ , Er 3+ . Together with experimental and theoretical results, we analyze the influence of defects on emission intensity. The locations of Yb 3+ , Er 3+ , and Bi 3+ are determined by X-ray absorption fine structure measurements, which are in agreement with the model constructed using first principles. This work may provide innovative guidance for the design of high-performance visible-light-activated near-infrared luminophores based on calculations and a new methodology for application of coherent laser radar and optical communication.
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ChemSusChem
·
2022
·Vol. 15
·期 21
·e202201473
·
IF 9.14
Rundong Fan,Yizeng Wu,Haipeng Xie,Yongli Gao,Lina Wang,Bo Zhao,Dong Li,Shaocheng Liu,Yu Zhang,Hua Kong,Yujing Li,Qi Chen,Anyuan Cao,Huanping Zhou
Graphical Hybrid theory : A hybrid perovskite material, 4,4’-ethylenedipyridinium lead bromide, is assembled onto carbon material to function as photoelectrode of the Li-oxygen battery, leading to a reduced overpotential of 0.5 V compared to the Li-oxygen battery without illumination (1.3 V). The overpotential can be maintained lower than 0.9 V after cycling for 170 h. Organic-inorganic hybrid perovskites have emerged in the last decade as promising semiconductors due to the excellent optoelectronic properties. This kind of perovskites exhibited respectable photocatalytic activities toward potential application in battery; however, the instability issue still hindered their practical use. Herein, a hybrid perovskite material, 4,4’-ethylenedipyridinium lead bromide [(4,4’-EDP)Pb 2 Br 6 ], was assembled onto the carbon materials to function as photoelectrode of the Li-oxygen battery. The strong cation-π interactions between the A-site cations enabled this hybrid perovskite to endure the cycling process as well as the exposure to battery electrolyte and oxygen. Benefitting from the photo-generated carriers of the photoelectrode under illumination, the formation/decomposition of the discharge product was accelerated, thus leading to a reduced overpotential from 1.3 V to an optimized 0.5 V compared to the Li-oxygen battery without illumination. The overpotential could be maintained lower than 0.9 V after cycling for 170 h. Furthermore, when exposed to the sunlight, the charging voltage was reduced by over 0.2 V. The intrinsic stability and strong light absorption of perovskites together with the optimized perovskite/carbon cathode interfaces contributed to the improved performance under different light sources without complex material design, which shed light on the exploration of organic-inorganic hybrid perovskites in Li-oxygen battery applications.
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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.
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TEXTILE RESEARCH JOURNAL
·
2023
·
IF 2.3
Liang Jin,Tao Qian,Yujun Cheng,Dongming Qi,John H. Xin,Gang Xia,Zhihua Cui
Dye wastewater has attracted great attention due to high pollution and toxicity which can cause harm to the living environment. It is common for azo-disperse dyes to be used to dye hydrophobic fibers. A reduction clearing method is used to eliminate the dye particles on the fabric after dyeing. However, when azo disperse dyes on the fiber surface are eliminated by the reduction clearing process, this can give rise to an effluent discharge due to the presence of sodium hydrosulfite. The introduction of carboxylic ester groups into dye molecules can effectively avoid this issue. Six novel environmentally friendly alkali-clearable disperse dyes, containing cyano and carboxylic ester groups, were readily synthesized by a diazo coupling reaction with various diazo components. Their dyeing properties on polyethylene terephthalate fabrics were respectively measured and compared with those of commercial reference dyes. It was indicated that some fastness properties of the synthesized dyes on polyethylene terephthalate fabrics after the alkali clearing were improved compared with those of the reference dyes due to the existence of the carboxylic ester group. Moreover, the chromaticity of dye wastewater can be further reduced by recovering hydrolyzed dyes.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lei Wang,Jafar Ali,Zhibin Wang,N.A. Oladoja,Rong Cheng,Changbo Zhang,Gilles Mailhot,Gang Pan
Nanobubbles have gained much attention due to their unusual properties such as large specific surface area, surface energy and internal energy, thereby, increase the surface reaction and improve the mass transfer efficiency. The long term stability of nanobubbles and generation of reactive oxygen species enables them to address various environmental issues for water purification without secondary pollution. However, there are few studies concerning the application of oxygen nanobubbles in the advanced oxidation processes (AOPs). In this study, first time, oxygen nanobubbles were introduced into the photoreaction system under visible light irradiation for enhanced photodegradation of oxytetracycline (OTC). Results indicated that oxygen nanobubbles significantly improved the photodegradation of OTC through high mass transfer and generation of reactive radicals during the nanobubble collapse. The oxygen nanobubble stability was confirmed to be pH dependent. The nanobubbles concentration increased from 0.76 to 3.78 × 10 8 particles/mL, while the mean size decreased from 205 nm to 138 nm as the pH value increased (3.2–11.0). The photodegradation efficiency of OTC was improved from 45% to 98% with the increase of pH (4.0–11.0). Oxygen nanobubbles hold promise to improve the AOPs , such as reducing catalysts and chemicals usage and costs. Quenching experiments demonstrated that OH was the predominant active species induced the photodegradation of OTC. With the development of nanobubbles technology, it is anticipated to realize totally chemicals free green technology. This study provides a novel nanobubble/AOPs technology, which will be more efficient and environmental friendly and will have broad application in waste water treatment and drinking water purification.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Hong Zhang,Xiaoxiang Xu
More than 1.6 eV band gap reductions have been realized on Mg 5 Ta 4 O 15 by nitrogen doping with its pseudobrookite structure maintained. The nitrogen doped Mg 5 Ta 4 O 15 , i.e. Mg 5 Ta 4 O 15-x N y , shows broad absorption in the visible light region and promising photocatalytic activity for both water reduction and oxidation reactions under visible light illumination (λ ≥ 400 nm). Apparent quantum efficiency as high as ~0.90% has been achieved at 420 ± 20 nm on Mg 5 Ta 4 O 15-x N y which is comparable to a number of active metal oxynitrides photocatalysts . Apart from visible light absorption, Nitrogen doping on Mg 5 Ta 4 O 15 is also accompanied by improved surface hydrophilicity and a negative shift of flat band potential. This simple strategy for band gap engineering can be extended to other metal oxides which may open new playgrounds in the design and development of efficient visible light active photocatalysts.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3519-3527
·
IF 1.093
Teng Wei,Wang Youmei,Lin Qin,Zhu Hui,Tang Yubin,Li Xinyong
Molybdenum disulfide (MoS2), as a typical layered transition metal sulfide, has been widely used in photocatalysis. Here, we report layered MoS2 nanosheet-coated TiO2 heterostructures that were prepared using a simple photo-assisted deposition method.
The as-prepared samples were investigated in detail by using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results demonstrated that the MoS2 nanosheets uniformly covered the outer surface
of TiO2. The visible light-sensitive photocatalytic activity was evaluated by the removal of methylene blue (MB) and 2-chlorophenol (2-CP) in aqueous solution. Thus, the MoS2/TiO2 heterostructures exhibited improved photocatalytic degradation activity under
visible light compared with the pure TiO2. Under visible light irradiation for 90 min, the degradation efficiencies of MB and 2-CP over the MoS2/TiO2 sample (sunlight irradiation time: 30 min) are as high as 93.6% and 70.6%, respectively. Furthermore, the corresponding
mechanism of enhanced photocatalytic activity is proposed on the basis of the comprehensively investigated results from the radical trapping experiments, photoluminescence spectroscopy, and electron spin resonance analysis. The hole oxidation, hydroxyl radicals, and superoxide anion radicals
act as the active species simultaneously in the photodegradation of the dye molecules. However, of these species, hole oxidation played the most important roles in the photocatalytic reaction.
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危险品化学品经营许可证（带存储）