MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
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IF 4.644
Zihan Yin,Yujie Shan,Mingyan Yu,Lun Yang,Jiaming Song,Peng Hu,Feng Teng
As a commonly used substrate and matrix material in the construction of high performance ultraviolet photodetector, ZnO nanorod arrays have attached much attention due to their efficiency electron transmission channels and high stability. However, they also have the problem of slow response speed inevitably. In this work, TiO 2 /ZnO nanorod arrays heterojunction structure was prepared and used to construct ultraviolet photodetector. The obtained heterojunction photodetector has a higher on/off ratio (>1000) and shorter rise/decay time (6.1/3.7 s) compared with that of photodetector based on ZnO nanorod arrays (on/off ratio ∼10 and decay time >20 s). The enhanced response speed is caused by the traps of the electron in TiO 2 layer, which can accelerate the decay of current in the OFF state. The obtained results provide a new sight for the further development of the optoelectronic devices based on ZnO nanorod arrays in future.
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高影响因子
JOURNAL OF FOOD SCIENCE
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2022
·Vol. 87
·期 6
·2417-2426
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IF 3.693
Erdong Yuan,Miao Zhou,Shiying Nie,Jiaoyan Ren
The interaction between zinc oxide nanoparticles (ZnO NPs) and whey protein (WP) was studied. The gastric epithelial cell line (GES-1) was used to evaluate the toxicity intensity of ZnO NPs. The interaction mechanism of ZnO NPs and WP was studied by spectroscopic techniques. The results showed that the inhibitory effect of ZnO NPs on cells activity could be reduced when added to ZnO NPs at a concentration of 50 µg/ml. The fluorescence quenching mechanism of ZnO NPs on WP is a combination of dynamic and static quenching. The interaction force between ZnO NPs and WP can be considered as H-bond and VdW force, and they have two binding sites. The interaction between WP and ZnO NPs leads to the loosening of the structural skeleton of WP and the extension of peptide chain, which exposes the tyrosine (Tyr) and tryptophan (Trp) hydrophobic groups in the hydrophobic region of protein molecules and reduces the hydrophobicity of the microenvironment. The ZnO NPs might form a complex with WP through H-bond, hydrophobic interactions, and so on, leading to peptide chain rearrangement, and finally causing changes in the secondary structure of α-helix. 1.1 Practical Application This study provides a theoretical basis for future research on the interaction between food ingredients and nanomaterials, the evaluation of toxicity of nanomaterials and the application scope of nanomaterials in food field.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Shuang Li,Yuchi Zhang,Le Han,Xianliang Li,Yan Xu
Heterojunction formation has been considered as an effective way for exploring ultrahigh sensitive multi-metal oxide based gas sensors. Herein, unique hierarchical radial CeO 2 /ZnO heterostructures with excellent triethylamine (TEA) gas-sensing performance were successfully prepared via a feasible solvothermal method . The morphology, microstructure and gas-sensing performance of the composite were systematically characterized and investigated. The selective TEA gas response of the radial CeO 2 /ZnO heterostructure was increased by ten times as compared to that of pure ZnO phase, ascribing to the abundant reactive sites induced by the formation of n-n heterojunction . Furthermore, the radial CeO 2 /ZnO n-n heterojunction exhibited the best TEA gas sensitivity with R a /R g = 92.17 at an operating temperature of 200 °C, a fast response/recovery time of 29 s/23 s, and a long-term stable repeatability for at least 60 days. The excellent selectivity of CeO 2 /ZnO heterojunction for TEA sensing is also remained even when mixing with other interferent gases. The interface-dependent and enhanced TEA sensing property of CeO 2 /ZnO can be ascribed to its intriguing radial morphology, for which the CeO 2 nanoparticles located in the internal structure of the composite while the ZnO hexagonal prism grew radially outward. The well assembled hierarchical CeO 2 /ZnO n-n heterojunction with abundant accessible active sites significantly facilitate the surface reaction and diffusion of target gas molecules at the interface between CeO 2 and ZnO during gas sensing process.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 35
·16990-16997
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IF 3.925
Guohao Xu,Xin Gao,Tao Luo,Yajie Duan,Huan Qian,Jisheng Yu,Xuedong Zhu
A novel core–shell ZSM-5@ZnO was successfully fabricated through a hydrothermal coating strategy, and the catalytic performance of ZSM-5@ZnO in the methane co-aromatization with propane (MCP) reaction was investigated using a physically-blended ZSM-5/ZnO catalyst as a comparison. Multi-techniques including XRD, ICP-AES, TEM, EDS, XPS, N2 adsorption, 27Al NMR, IR and IG were employed to investigate the deactivation of the carbon deposition and the physicochemical properties of ZSM-5@ZnO. The results revealed that the introduction of methane into propane aromatization can promote the formation of Zn methyl species, further promoting the conversion of reactants and the formation of products. The MCP reaction at 550 °C revealed that ZSM-5@ZnO showed a higher methane and propane conversion and greater aromatic selectivity than those of the physically-blended ZSM-5/ZnO catalyst. The special reaction pathway of the shell (ZnO, metallic sites)–core (ZSM-5, acidic sites) and the relatively close proximity between ZnO and ZSM-5 were responsible for the excellent properties in MCP. Additionally, the formation of the micro–mesoporous property accelerated the mass-transfer rate and inhibited the formation of carbonaceous deposition, significantly enhancing the lifetime of the catalyst. Thanks to the novel core–shell structure of the ZSM-5@ZnO catalyst, it showed excellent properties in the MCP reaction.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Liu-Xin Cai,Li Chen,Xi-Qian Sun,Jing Geng,Chen-Chen Liu,Yue Wang,Zheng Guo
One-dimensional hetero-structured nanofibers (NFs) have recently received great attention because of their rich architectures and potential applications in the field of gas sensors. Polyoxometalate (POM) is a unique nanosized transition metal-oxygen cluster used as a molecular platform to prepare metal oxide nanomaterials and accompanied by high negative charges that readily combine with various metal oxide precursors to form metal oxide complexes. Herein, with the assistance of POM, ZnWO 4 /ZnO hetero-structured NFs were prepared by combining facile electrospinning with thermal oxidation . Adjusting the molar ratio of POM (H 3 PW 12 O 40 ·xH 2 O, denoted as PW 12 ) and Zn(NO 3 ) 2 ·6H 2 O (denoted as Zn 2+ ) in the precursor solution , a series of ZnWO 4 /ZnO hetero-structured NFs were obtained. Compared with pure ZnO NFs, the optimized ZnWO 4 /ZnO hetero-structured NFs demonstrate more excellent sensing performance. A high relative response of 108.5 was achieved for 50 ppm triethylamine (TEA) and with a low detection limit about 150 ppb. Furthermore, the ZnWO 4 /ZnO hetero-structured NFs exhibited remarkable TEA selectivity and outstanding reproducibility. The enhanced sensing mechanism toward TEA could be attributed to n-n heterojunctions with the obvious barrier-control electron transfer effect at the interface between ZnWO 4 and ZnO.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 63
·15706-15715
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IF 5.236
Shang Chen,Kangjia Tao,Xin Chen,Yongqiang Meng,Manyun Wang,Ji Zhou,Chao Chen,Yulin Wang,Kwun Nam Hui,Christopher W. Bielawski,Jianxin Geng
Graphical A Li host material that features vertically aligned channels composed of graphene, carbon nanotubes (CNTs), and decorated ZnO particles (designated ZnO@G-CNT-C) has been prepared by using an ice-template method through oriented freezing. The Li host material not only suppresses the formation of Li dendrites but also reduces the overpotential of Li nucleation. The usability of ZnO@G-CNT-C as Li host was confirmed in full cells with a LiFePO 4 cathode. Lithium (Li) metal is regarded as the ultimate anode material for use in Li batteries due to its high theoretical capacity (3860 mA h g −1 ). However, the Li dendrites that are generated during iterative Li plating/stripping cycles cause poor cycling stability and even present safety risks, and thus severely handicap the commercial utility of Li metal anodes. Herein, we describe a graphene and carbon nanotube (CNT)-based Li host material that features vertically aligned channels with attached ZnO particles (designated ZnO@G-CNT-C) and show that the material effectively regulates Li plating and stripping. ZnO@G-CNT-C is prepared from an aqueous suspension of Zn(OAc) 2 , CNTs, and graphene oxide by using ice to template channel growth. ZnO@G-CNT-C was found to be mechanically robust and capable of guiding Li deposition on the inner walls of the channels without the formation of Li dendrites. When used as an electrode, the material exhibits relatively low polarization for Li plating, fast Li-ion diffusion, and high Coulombic efficiency, even over hundreds of Li plating/stripping cycles. Moreover, full cells prepared with ZnO@G-CNT-C as Li host and LiFePO 4 as cathode exhibit outstanding performance in terms of specific capacity (155.9 mA h g −1 at 0.5 C), rate performance (91.8 mA h g −1 at 4 C), cycling stability (109.4 mA h g −1 at 0.5 C after 800 cycles). The methodology described can be readily adapted to enable the use of carbon-based electrodes with well-defined channels in a wide range of contemporary applications that pertain to energy storage and delivery.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wentao Ye,Yu Jiang,Qi Liu,Doudou Xu,En Zhang,XinWei Cheng,Zhou Wan,Chen Liu
Photocatalytic technology has been attracting considerable attention due to its low cost and environmental friendly properties. In this work, a novel ZnO/Ag 2 MoO 4 /Ag (ZAA) nanocomposite was prepared by an ultrasonic-irradiation method as an efficient visible-light-driven photocatalyst. The structure and photocatalytic property of the photocatalyst were studied by XRD , SEM, FTIR, XPS , TEM , UV–vis DRS and PL Spectroscopy, respectively. The results indicated that the Ag 2 MoO 4 nanocomposites were successfully decorated on the ZnO sheets which grabbed Ag NPs. Benefiting from local surface plasmon resonance effect of metallic silver and the formation of heterojunctions between the counterparts of ZnO and Ag 2 MoO 4 , it effectively suppresses recombination of photogenerated charge carriers, which can enhance good photocatalytic properties and antibacterial activities. An optimal photocatalysis of ZAA with molar ratio of ZnO to Ag 2 MoO 4 at 40:1 performed the highest degradation rate for rhodamine B under visible light irradiation. In addition, over 99.999% of Gram-negative E. coli and 99.846% of Gram-positive S. aureus were reduced by ZAA-40 nanocomposites within 60 min in comparison to pure ZnO sheet. These results demonstrate that ZAA is a promising photocatalyst, making it a prospective strategy to overcome current challengers in the use of organic pollutant degradation and the photocatalytic antibacterial area.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yubin Li,Yi He,Jia Zhuang,Heng Shi
Materials with superwettability have attracted much research interest over the last few decades in the field of water-oil separation. Distinct from other superwetting materials, dual superlyophobic materials that have superoleophobicity in water and superhydrophobicity in oil can perform on-demand oil/water separation without requiring extra energy. However, obtaining such a dual superlyophobic membrane with multifunctionality for application in a complicated wastewater environment remains a challenge. Taking advantage of both ZnO and polydopamine , a multifunctional PDA/SC/KFs@ZnO freestanding membrane was prepared in our study. This novel material displays dual superlyophobicity and has potential application for rapid and simultaneous separation of light and heavy oil-water mixtures, oil-in-water emulsions with soluble dye, and water-in-oil emulsions, as well as a good adsorption-catalysis performance for removing soluble dyes in water under visible light . Our work presents a facial and economic method that uses natural kapok fibers to fabricate a special multifunctional superwetting membrane that is promising for future applications.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Liang,Wei Li,Xuan Wang,Run Zhou,Hao Ding
TiO 2 –ZnO/Au ternary heterojunction nanocomposite was fabricated by producing TiO 2 nanosheets first using solvent-thermal method followed by Au deposition and ZnO deposition respectively. The TiO 2 nanosheets provide a relatively large surface area for the good dispersion of ZnO nanoparticles and Au particles and sufficient contact with the medium, which contribute to the excellent photocatalytic performances of TiO 2 –ZnO/Au heterojunction composite. The phases and structures, morphologies, surface and optical properties of the ternary heterojunction composite are well-characterized. Subsequently, the photocatalytic hydrogen generation of TiO 2 –ZnO/Au is evaluated under visible light irradiation. TiO 2 –ZnO/Au ternary heterojunction composite has efficient light absorption ability and excellent performances in photocatalytic hydrogen generation (1068 μmol/g under the irradiation of visible light for 4 h) and antibacterial properties (reaching 98.2%). TiO 2 –ZnO/Au ternary heterojunction nanocomposite has a large potential to be used in areas such as interior wall coating.
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高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Jinghui Zhan,Huayao Chen,Hongjun Zhou,Li Hao,Hua Xu,Xinhua Zhou
Nano-scale antibacterial agents have attracted enthusiastic attention due to their size-dependent qualities, effective antibacterial activity, and unique physiochemical properties, which showed great application potential in plant protection and nutrition. In this work, Mt-supported ZnO/TiO 2 nanocomposite was prepared through sol-gel assisted impregnation method, and its antibacterial activity against gram-positive bacteria ( S. aureus ) and the wettability on cucumber leaves was investigated. The results suggested that the pillaring of Mt by TiO 2 increased BET specific surface area, improved Zn-dispersion, enhanced adsorption capacity , forming an exfoliation structure of TiO 2 pillared Mt nanocomposite . Besides, Mt-supported ZnO/TiO 2 nanocomposite showed an obvious increase of antibacterial activity and wetting property over pure ZnO and Mt-supported ZnO composite due to the doping of zinc oxide by carbon atoms and the increase of exposed active sites caused by the effective dispersion of ZnO. In addition, the optimal performance was achieved for 15.04% Zn element content with the diameter of the inhibition zone was 48.53 ± 0.1 mm and the contact angle was 82.5 ± 0.2° attributed to the increased BET surface area (72.33 m 2 /g) and metal oxide interaction between TiO 2 and Zn 2+ . The relatively low cost, green and environment friendly, high antibacterial activity, and wettability of Mt-supported ZnO/TiO 2 nanocomposite offers new avenues for the antibacterial agent in the field of agriculture and crop protection.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Cunyin Zhang,Leibin Guo,Chengwei Deng,Haili Huang,Yuanhui Cheng
Aqueous zinc-based flow battery has advantages of low cost, high safety and abundant reservoir, showing a good application prospect. However, zinc dendrites remain a big issue to their cycling stability. Herein, we construct a multi-structured semi-solid anode by packaging multi-layered graphite felt and zinc slurry based on microporous carbon wrapped nano-ZnO ( [email protected] ). [email protected] is prepared by polymerizing dopamine on nano-ZnO and followed calcination . Microporous carbon shells act as restriction spaces, forbidding either oxidized or reduced zinc species flow out, but also serve as the first electron network. Meanwhile, carbon black and graphite felt function as the second and third electron networks. Besides, trace alkaline solutions deliver hydroxyl ions. Thus, the redox of zinc species proceeds in microporous carbon shells without zinc dendrites. Resultantly, semi-solid anode has high electrochemical activity and stability in zinc-iron flow batteries. The average efficiency is 74.8％ with negligible fluctuations over 840 h (460 cycles).
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高影响因子
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