CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Xianghua Wang,Xingfu Chen,Xinjun Wang,Juntao Hu,Yihui Wu,Wen-Hua Zhang
The surface polarity of nanocrystalline ZnO film, a typical electron transport material in optoelectronics , is chemically modified using self-assembled monolayer (SAM) of phenethyl trichlorosilane (PETS). The surface treatment is proved to generate a hydrophobic surface by removing the hydroxyl groups on the oxide layer, which reduces the emission quenching of the subsequent CsPbBr 3 quantum dot film. In addition, the surface polarity was engineered with varying PETS concentration, thereby contribute to an increased photoluminescence quantum yield (PLQY) by up to 50%. Meanwhile, the thermal stability of photoluminescence was enhanced showing a wide-range temperature tolerance up to 140 °C.
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CATALYSIS LETTERS
·
2020
·Vol. 150
·期 10
·2863-2872
·
IF 2.482
Zhang Pingbo,Chen Yifeng,Zhu Mengnan,Yue Chengguang,Dong Yuming,Leng Yan,Fan Mingming,Jiang Pingping
Magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) exhibited good catalytic activity in the transesterification of glycerol and dimethyl carbonate to yield glycerol carbonate. The glycerol conversion of 97.7% and glycerol carbonate yield of 96.9% could be obtained in this reaction system under the optimized reaction conditions. CoFe 2 O 4 @(CaO–ZnO) was characterized by a series of techniques including TPD, XRD, SEM, TEM, EDS, VSM and BET to evaluate the physico-chemical properties of the catalyst. It was demonstrated that the interaction of acid–base sites improved the catalysis performance of CoFe 2 O 4 @(CaO–ZnO): the strong basic sites were beneficial to the activation of glycerol to glyceroxide anion which could increase glycerol conversion, and the acid site contributes to the carbonyl activation of dimethyl carbonate, converts glyceroxide anion to glycerol carbonate, and improves the selectivity of glycerol carbonate. Meanwhile, the solid–liquid separation process after reaction would be simplified significantly considering CoFe 2 O 4 @(CaO–ZnO) could be easily separated from the reaction mixture under magnetic action. Graphic Abstract Acidic–basic bifunctional magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) was used as a solid base catalyst for the glycerol transesterification. Basic sites were beneficial to the activation of glycerol to glycerol oxygen anion to increase glycerol conversion and acidic sites were beneficial to carbonyl activation of DMC to increase glycerol carbonate selectivity. With magnetism, the solid base catalyst was easily recovered.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2020
·
IF 2.717
Wentao Hu,Xi'an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Jian Wang
In this work, Fe/ZnO soft magnetic composite (SMC) is prepared successfully by sol-gel method combined with a pyrolysis process. Formation mechanism and effect of annealing on magnetic properties for the Fe/ZnO SMCs are studied in detail. The results show that Fe/zinc acetate hydrogel mixture will be decomposed into the Fe/ZnO composites by heating above 340 °C. And ZnO is well coated on the surfaces of Fe particles. The Fe/ZnO composite compact has lower total core loss and better frequency stability of magnetic permeability compared with pure Fe compact. In addition, annealing treatment shows an enhanced effect on the magnetic properties for the Fe/ZnO composite compact such as reduced coercivity and increased permeability. The annealed Fe/ZnO SMCs can keep stable magnetic permeability (26) from 50 Hz to 10 kHz, high magnetic induction (1.65 T) and a relatively low core loss of 91.11 kW/m 3 measured under a magnetic flux density of 30 mT at 10 kHz. Therefore, the Fe/ZnO soft magnetic composites prepared by the above-mentioned method provide a great potential application in electromagnetic conversion equipment.
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IONICS
·
2020
·Vol. 26
·期 7
·3281-3288
·
IF 2.394
Yang He,Chang Limin,Wang Limin,Yin Dongming,Wang Duo,Cheng Yong
The advanced electrode construction consisting of Ni foam uniformly covered by layered ZnO microspheres (ZnO@Ni LMs) is successfully assembled by a simple thermal treatment process followed by a mild annealing treatment, which can be directly used as a binder-free electrode for lithium-ion batteries (LIBs). The as-synthesized ZnO@Ni LMs consist of numerous nanoparticles, leaving abundant porous to mitigate the volume changes between charge-discharge process. Remarkably, binder-free electrode circumvents the addition of insulating material (binder) and inhomogeneous distribution of conductive carbon material on current collector. When evaluated as binder-free electrode for LIBs, ZnO@Ni LMs deliver a superior specific capacity (1144 mA h g −1 at 100 mA g −1 ), brilliant rate capability, and excellent cycling ability (565 mA h g −1 at 100 mA g −1 after 100 cycles).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9550-9558
·
IF 2.22
Zheng Jiahong,Cheng Kangkang,Wu Yuntao,Yu Pengfei
This work reports a molecularly imprinting polymer based on environmentally friendly and non-toxic ZnO quantum dots for the selective detection sulfadimidine. The MIP@ZnO was prepared by sol–gel method, which usedZnO quantum dots, TEOS, APTES, ammonia as signal materials, cross-linker, function monomer, and initiator, respectively. Result proved that MIP@ZnO exhibited excellent selective fluorescence quenching in the presence of sulfadimidine, good linear relationship in the range of 0–40 μmol L −1 with a correlation coefficient ( R 2 ) of 0.98547 was obtained, and the imprinting factor was 2.83. Furthermore, MIP@ZnO has been successfully applied for detection SM 2 in real samples with the spiked recoveries ranging from 95.6 to 99.8% with RSD below 2.38%.
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Optoelectronics Letters
·
2020
·Vol. 16
·期 4
·293-297
·
IF 0
Li Peng,Zhang Hong-yan,Li Zhi-jun,Zhang Jun
The influence of polyvinylpyrrolidone (PVP) and monoethanolamine (MEA) as surfactants on photoluminescence (PL) of Eu-doped ZnO (ZnO:Eu) has been studied. X-ray diffraction (XRD) results show that there are more Eu 3+ ions to replace Zn 2+ ions into ZnO lattice for ZnO:Eu in the presence of surfactant MEA. From the spectral analysis for ZnO:Eu with different surfactants by Gaussian deconvolution, it can be seen that the use of MEA as a surfactant affects the energy transfer from ZnO host to Eu 3+ ions and leads to three new emission peaks, including UV emission (389 nm), violet emission (411 nm) and green emission (506 nm).
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ACS Applied Nano Materials
·
2020
·
IF 0
Jia Li,Xiang Zhu,Jianyu Wang,Zhiyan Rui,Shiqiao Zhang,Yuxin Li,Rui Ding,Wenxiang He,Jianguo Liu,Zhigang Zou
Nonprecious metal electrocatalysts (NPMEs) have been recognized as highly promising oxygen electroreduction catalysts, but improving their activity and stability in acidic electrolyte remains critical. Here, we integrated self-assembly technology induced by rotary evaporation with the hard-template method to synthesize Fe–N-codoped NPMEs with large specific surface areas and hierarchical pore structure. The presence of Fe3+ assisted complete removal of the ZnO hard template at a relatively low temperature, which is beneficial for both the in situ growth of micropores/mesopores within the carbon layers and the retention of more nitrogen-containing groups. The obtained Fe–N–C/ZnO porous carbon material exhibited outstanding oxygen reduction reaction catalytic activity, along with respectable electrochemical stability in a perchloric acid electrolyte. Applied in fuel cells, the electrocatalyst loading was reduced to 2.0 mg/cm2 because of increased mass transfer arising from the hierarchical porous structure and resulting in a power density of 700 mW/cm2.
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Nanotechnology Reviews
·
2019
·Vol. 8
·期 1
·315-326
·
IF 2.759
Yuan Xie,Wei Wei,Fanbin Meng,Xi Qu,Jinyang Li,Li Wang,Zuowan Zhou
In response to the widespread bacterial threat, mechanical bactericidal nanostructures with various morphologies have been reported for years. However, the relationship between morphology and bactericidal properties is still yet to be elucidated due to the lack of a fair comparison under similar density of the nanostructures. For this purpose, an electrical-field assisted hydrothermal growth method were utilized to prepare the ZnO nanoarrays with similar array density (1.9×10 9 rod·cm 2 -2.4 ×10 9 rod·cm 2 ) but gradient morphologies from hexagonal prism, hexagonal prismoid to hexagonal pyramid on stainless steel sheets. Moreover, in dark condition, a bactericidal activity was observed on the ZnO nanoarray surfaces within 30 min contact for both E. coli and S. aureus cells. The bactericidal rate was rapidly enhanced as the average tip width of the nanorods decreasing from 137 to 38 nm. These results suggest that the hexagonal pyramid ZnO nanoarrays have a rapid, efficient and broad-spectrum bactericidal activity, which could contribute to the next-generation aquatic pathogens control strategies.
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RSC Advances
·
2019
·Vol. 9
·期 66
·38772-38782
·
IF 3.049
Danya Huang,Ying Zhang,Jingjing Zhang,Hongli Wang,Minggang Wang,Chen Wu,Daowen Cheng,Yue Chi,Zhankui Zhao
The design and synthesis of an efficient adsorbent for antibiotics-based pollutants is challenging due to the unique physicochemical properties of antibiotics. The development of a mesoporous SiO2–ZnO composite is a novel way to achieve excellent adsorption efficiency for doxycycline hydrochloride (DOX) in aqueous solutions due to the engineered highly open mesoporous structure and the ZnO-modified framework. Unlike the traditional method of obtaining mesoporous composites by post-synthesis techniques, the novel one-step method developed in this study is both effective and environment-friendly. The adsorption mechanism based on the novel synergetic effect between SiO2 and ZnO was demonstrated through several experiments. SiO2 led to the creation of a 3D open framework structure that provides sufficient space and rapid transport channels for adsorption, ensuring rapid adsorption kinetics. A higher number of active sites and enhanced affinity of the contaminants are provided by ZnO, ensuring high adsorption capacity. The mesoporous SiO2–ZnO could be easily regenerated without a significant decrease in its adsorption efficiency. These results indicate that the developed strategy afforded a simple approach for synthesizing the novel mesoporous composites, and that mesoporous SiO2–ZnO is a possible alternative adsorbent for the removal of DOX from wastewater.
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PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 6
·802-807
·
IF 1.65
Du Jingjing,Guo Ruilin,Li Ke,Ma Bingbing,Chen Yan,Lv Yanna
In this work, we assessed the toxic effects of ZnO nanoparticles (NPs; 1, 10, and 50 mg L −1 ) and the corresponding dissoluble Zn ions (0.71, 8.66, and 35.59 mg L −1 ) on Microcystis aeruginosa . After chronic exposure (28 days), significantly higher growth inhibition was observed under ZnO NPs at 1 mg L −1 (47%) than under Zn ions at 0.71 mg L −1 (−15%). The opposite effect pattern was observed for ZnO NPs at 10 (71% vs. 80%) and 50 mg L −1 (73% vs. 95%) compared to Zn ions at the corresponding concentrations. After 7 days of exposure, ZnO NPs at 10 and 50 mg L −1 led to an increase of 83 and 53% in malondialdehyde content, as well as an increase of 106 and 61% in superoxide dismutase activity, respectively. However, Zn ions at the corresponding concentrations showed negligible impacts on the two parameters. The different results indicate that the insoluble NPs during the initial exposure mostly account for lipid peroxidation, which further lead to microalgal antioxidant response. During the subsequent exposure, the contributors of ZnO NP toxicity shift with the concentration and exposure time of ZnO NPs. In conclusion, the study presents new insights into the different contributions of insoluble NPs and dissoluble metallic ions to metallic NP toxicity.
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RSC Advances
·
2022
·Vol. 12
·期 52
·34107-34116
·
IF 4.036
Chuanfeng Zang,Hao Chen,Xiangye Han,Wei Zhang,Junfang Wu,Fanghua Liang,Jiamu Dai,Hongchao Liu,Guangyu Zhang,Ke-Qin Zhang,Mingzheng Ge
PVDF/ZnO/CuS photocatalysts with ZnO/CuS heterojunctions were synthesized via electrospinning, hydrothermal, and ion-exchange techniques. As matrix materials, electrospun PVDF nanofibers are easy to be recycled and reused. ZnO nanorods anchored on PVDF nanofiber with high specific surface area provide abundant active reaction sites for photocatalysis. While the loaded CuS nanoparticles as a photosensitizer compensate the low quantum efficiency of ZnO and improve the visible-light photocatalytic efficiency. As a result, the PVDF/ZnO/CuS composited photocatalyst exhibits outstanding photocatalytic performance in exposure to UV and visible light owing to the suppressed recombination of electron–hole pairs and widened visible light absorption range. The kinetic constants of PVDF/ZnO/CuS nanocomposites under UV irradiation (9.01 × 10−3 min−1) and visible light (6.53 × 10−3 min−1) irradiation were 3.66 and 2.53 times higher than that of PVDF/ZnO (2.46 × 10−3 min−1 & 2.58 × 10−3 min−1), respectively. Furthermore, PVDF/ZnO/CuS nanocomposites demonstrate excellent robustness in terms of recycling and reuse, which is advantageous in practical applications.
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高影响因子
SENSORS
·
2022
·Vol. 23
·期 1
·91
·
IF 3.847
Yanlu Chen,Xinxin Pu,Xinyu Xu,Menghan Shi,Hui-Jun Li,Ding Wang
The traditional self-supported piezoelectric thin films prepared by filtration methods are limited in practical applications due to their poor tensile properties. The strategy of using flexible polyethylene terephthalate (PET) fabric as the flexible substrate is beneficial to enhancing the flexibility and stretchability of the flexible device, thus extending the applications of pressure sensors. In this work, a novel wearable pressure sensor is prepared, of which uniform and dense ZnO nanoarray-coated PET fabrics are covered by a two-dimensional MXene nanosheet. The ternary structure incorporates the advantages of the three components including the superior piezoelectric properties of ZnO nanorod arrays, the excellent flexibility of the PET substrate, and the outstanding conductivity of MXene, resulting in a novel wearable sensor with excellent pressure-sensitive properties. The PET/ZnO@MXene pressure sensor exhibits excellent sensing performance (S = 53.22 kPa−1), fast response/recovery speeds (150 ms and 100 ms), and superior flexural stability (over 30 cycles at 5% strain). The composite fabric also shows high sensitivity in both motion monitoring and physiological signal detection (e.g., device bending, elbow bending, finger bending, wrist pulse peaks, and sound signal discrimination). These findings provide insight into composite fabric-based pressure-sensitive materials, demonstrating the great significance and promising prospects in the field of flexible pressure sensing.Keywords:flexible pressure sensors;MXene;pressure-sensitive;ZnO nanoarrays
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