OPTICS AND LASER TECHNOLOGY
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2023
·
IF 5
Yuanli Xu,Wenlin Feng
A transmission fiber-optic surface plasmon resonance (SPR) sensor based on three-core optical fiber (TCF) coated with mercaptoundecanoic acid (MUA)/ nonionic polyacrylamide (NPAM)/zinc oxide (ZnO) composite film for the detection of chromium ions (Cr 3+ ) in water was proposed and fabricated. Multi-mode fiber (MMF) was spliced with both ends of TCF to form the MMF1-TCF-MMF2 sensing structure. The silver (Ag) film was deposited on the surface of TCF cladding, and then a uniform MUA/NPAM/ZnO composite film was coated on the outer surface of the Ag film to adsorb Cr 3+ , resulting in the wavelength shift of the SPR resonance peak. After adsorption of Cr 3+ , the refractive index of the sensing film changed and the resonance wavelength shifted about 62 nm. The detection limit of the sensor is about 0.029 μΜ (1.5 ppb), and the minimum detection concentration of Cr 3+ is about 0.2 µM (10 ppb), which is far lower than that of the World Health Organization standard (50 ppb). The sensor shows excellent selectivity, high sensitivity and good stability for the trace Cr 3+ , and has potential application for monitoring Cr 3+ in water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaohong Ma,Jiajia Zheng,Huacheng Jin,Xi Zeng,Danyang Li,Feifei You,Jian Qi,Fangli Yuan
The utilization of solar energy to convert CO 2 into small energy molecules is a potential “carbon neutral” technology for CO 2 emission reduction. However, the industrial application is significantly constrained due to the low reduction efficiency, complexity of the synthesis methods, and limitations in scaling up the catalyst materials. In this work, we have successfully designed and synthesized a series of hollow tubular ZnO@ZnS core-sheath heterostructured materials, by combining radio-frequency thermal plasma and hydrothermal treatment technologies. The S:Zn molar ratio, reaction time, and temperature were systematically investigated, and the morphology of intermediate products was successfully captured, which provided conclusive evidence for the proposed formation mechanism. Notably, the photocatalytic CO yield of the ZS 0.5 O hollow nanotube core-sheath composite is not only 3.20 or 4.03 times higher than that of the pure ZnO or ZnS, respectively, but also possesses excellent stability. By in-depth characterization, we found that the hollow core-sheath heterostructure enhances light capture and absorption, exposes more effective active sites, and builds a type-II heterojunction between ZnO and ZnS to enhance the separation efficiency of charge carriers. The synergy of these factors significantly improves the catalytic performance, offering new insights for photocatalytic, electrocatalytic, and photoelectrocatalytic CO 2 reduction.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yao Chen,Zhenyuan Ji,Jiabiao Lian,Hu Zhou,Xiaoping Shen,Lirong Kong,Aihua Yuan
Zinc tungstate (ZnWO 4 ) shows great promise as an anode material for lithium-ion batteries (LIBs) owing to its reversible multi-electron redox reactions and high theoretical capacity. Nevertheless, the low conductivity and big strain during cycling can lead to the inferior electrochemical properties of the ZnWO 4 anode, hindering its practical application. Herein, we report a novel composite with ZnWO 4 /ZnO porous nanoplates in-situ constructed on reduced graphene oxide (rGO) by a metal–organic framework template strategy. The nanoplates with good porosity are composed of nanoparticles and nanorods, providing a short Li + -diffusion distance and plentiful Li + storage active sites. The introduction of rGO can accelerate charge transfer and reinforce structural stability. As a result of these advantages, the ZnWO 4 /ZnO/rGO composite as LIBs anode delivers a high reversible capacity of 811 mAh g after 100 cycles at 200 mA g −1 , excellent rate capability (437 mAh g at 5000 mA g −1 ), and good long cycling stability (485 mAh g after 500 cycles at 2000 mA g −1 ). Notably, the rate capability of the composite far precedes the previously reported ZnWO 4 -based anodes. This work provides an efficient approach for designing and fabricating advanced metal tungstate-based anodes for high-performance LIBs .
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Siyao Zhang,Shiyou Yu,Xin Wang,Yipeng Zhang,Zhenge Yue,Chenchen Li,Yongqiang Ma
Long-term consumption of honey containing ciprofloxacin (CIP) residues may harm human health. It is important to establish a sensitive and rapid CIP detection method. This study reports for the first time the development of an electrochemical sensor for rapid determination of CIP in honey, utilizing a MnO 2 /ZnO composites. Two types of ZnO with different morphologies were prepared, characterized, and compared for their electrocatalytic properties for CIP. The findings indicated that the rod-like ZnO had a better catalytic effect on CIP and was thus selected to combine with MnO 2 to form the composite material. Characterization of the resulting composite material was conducted, followed by an investigation of the electrochemical reaction of CIP on the electrode and optimization of the detection conditions of the sensors. The results indicate that the current value of CIP had a linear relationship with its concentration within the range of 0.5 to 120 µM, and the detection limit was 0.21 µM. The MnO 2 /ZnO/GCE sensor was applied to detect the CIP residues in honey samples, and the recoveries ranged from 95.3% to 97.2%. The results show that the composite material-modified sensor has good sensitivity and can enable rapid detection of CIP content in honey. Therefore, it has a potential application in detecting CIP residues in honey.
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SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 4
·045025
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IF 2.352
Xiang Yu Liu,Jin Li
Solar-driven nano-semiconductor catalysts have shown great potential in solving environmental pollution and energy issues. They convert solar energy into chemical energy, release strong oxidizing hydroxyl radicals (OH·), and thoroughly degrade organic pollutants. However, these photocatalysts in turn may also damage some organic carriers. Therefore, we have used graphite phase carbon nitride (g-C3N4) as the isolation layer to prevent the carrier polyester fiber (PET) from being oxidized by zinc oxide (ZnO). ZnO-g-C3N4@PET composite has been prepared by hydrothermal method, photoluminescence results indicated that ZnO-g-C3N4@PET has a low photo-generated charge recombination rate, while g-C3N4 improves the visible light response of the composite and exhibits an obvious photocatalytic enhancement effect. In the experiment of degrading methylene blue (MB), the degradation efficiency of ZnO-g-C3N4@PET composite has been significantly improved compared with ZnO@PET and g-C3N4@PET alone. In addition, the prepared photocatalyst also has good reusability and still maintains a high degradation rate after five cycles of tests. In the end, a possible mechanism and a pathway of photocatalytic degradation of MB were proposed. All in all, this is a feasible way to build a highly efficient, environmentally friendly and sustainable supported photocatalyst.
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Scientific Reports
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2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Chen Xi,Wang Qi,Wang Xiao-Ju,Li Jie,Xu Guo-Bin
In this study, the ZnO quantum dots (QDs) water-based fluorescent anti-counterfeiting ink was prepared with the polyvinylpyrrolidone (PVP) content of 0.15–0.17 g/mL, the ZnO QDs concentration of 4% and water as the solvent, which has good fluorescence, printability and resistance. According to the halftone technology, fluorescence quenching of the ZnO QDs by acid, and acid resistance of the organic fluorescent ink, a high-quality anti-counterfeiting method of fluorescent discoloration was proposed. The QDs ink has broad application prospects in the field of anti-counterfeiting green packaging.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jingjing Liu,Liuyang Zhang,Bei Cheng,Jiajie Fan,Jiaguo Yu
Timely detection of formaldehyde is pivotal because formaldehyde is slowly released from the indoor decorative materials, jeopardizing our healthy. Herein, a high-response formaldehyde gas sensor based on Ag-ZnO/In 2 O 3 nanofibers was successfully fabricated. Compared with all the control samples, the hybrid exhibits superior sensitivity (0.65 ppm −1 ), excellent selectivity (≥ 12.5) and durable stability (the deviation value ≤ 3%). Particularly, an ultra-high response value of about 186 towards 100 ppm of formaldehyde at 260 °C was achieved, heading the list of outstanding candidates. Additionally, the limit of detection is as low as 9 ppb. The enhanced gas sensing properties can be mainly attributed to multi-level heterojunctions (n-n heterojunction and Ohmic junction) and the “spill-over” effect of Ag, ultimately increasing the adsorption of gas molecules on the surface of sensing material. This work verifies that proper design of multi-level heterojunctions significantly upgrade the sensing performance.
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PubMed
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Meng Zhou,Wenjie Zhao,Qiming Yan,Heqing Fu
The design of multiple heterogeneous interfaces has been proven to be a successful strategy to boost microwave absorption performance. However, the synthesis of magnetic microwave absorber with wide absorption bandwidth is still a challenge. In this work, ZnO@MWCNTs@NiFe 2 O 4 nanocomposites are fabricated by introducing ZnO on the surface of MWCNTs and subsequent anchoring of NiFe 2 O 4 . The minimum reflection loss can reach − 45.5 dB at 12.4 GHz with a thickness of 2 mm, while the broadest efficient absorption bandwidth is above 6.4 GHz at only a 3 mm thickness. Furthermore, the microwave absorption performance of ternary nanocomposites can be optimized by tunable the content of ZnO and NiFe 2 O 4 , whose microwave absorption mechanism depends on the synergy of dielectric loss and magnetic loss. The formation of 3D conductive network and heterogeneous interfaces contributes to the enhancement of conductive loss and polarization, respectively. The experimental results demonstrated that the ZnO@MWCNTs@NiFe 2 O 4 nanocomposites can provide a guide for microwave absorbers with wide absorption bandwidth in the future.
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Crystals
·
2021
·Vol. 11
·期 5
·522
·
IF 2.589
Xinying Yang,Jin Tian,Yang Guo,Mengyuan Teng,Haixia Liu,Tianduo Li,Pingli Lv,Xuping Wang
Zinc oxide (ZnO) possesses superior chemical and physical properties so that it can occupy an essential position in the application of nanostructures. In this paper, ZnO nano-rod arrays were synthesized by a simple one-step hydrothermal approach with the assistance of cetyl trimethyl ammonium bromide (CTAB). Exposure of the {0001} facets could be controlled by adjusting the amount of CTAB and the maximum exposure of the {0001} facets of ZnO nanorods is obtained at 1.2 g of CTAB. The photocurrent, EIS, and PL measurements support the facile charge transfer with minimum recombination of the photogenerated excitons of the ZnO nano-rod arrays obtained at 1.2 g of CTAB. Consequently, the obtained ZnO nano-rod arrays at the optimal CTAB of 1.2 g exhibit an excellent photocatalytic degradation rate of 99.7% for rhodamine B (RhB), while the degradation rate of RhB by the ZnO obtained without CTAB is only 35%.Keywords:ZnO nano-rod arrays;morphology;{0001} facets;photocatalytic activity
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Lei Xue,Aiai Zhang,Jinfang Wu,Qi Wang,Yang Liu,Yuansong Zhao,Shangpeng Liu,Ze Liu,Ping Li,Shanghong Zeng
Surface chemistry can be modified by introducing another component on the surface of catalyst due to the regulation of configuration and electronic properties. Herein, the nanostructured ZnO hollow microspheres were fabricated for selective CO 2 reduction to CO. The addition of CuO weakens the strength of adjacent Zn-O bond and improves the formation of more zero-valence Zn. Small CuO entities can provide the active sites for CO 2 adsorption, and the presence of surface defects due to Zn 2+ reduction could enhance initial dissociation from CO 2 to CO. More interestingly, the 3CuO/ZnO catalyst underwent reconstruction during electrocatalysis , and multi-shelled hollow spheres evolved into a thin flaky structure. The extended surface area of flaky morphology enhances the catalytic stability despite the occurrence of ZnO reduction. This study highlights the importance of surface modification for CO 2 selective reduction to CO but also provides some insights on reconstruction during electrochemical reduction of CO 2 .
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Huifang Wang,Jun Zhang,Qichong Zhang,Hao Wu,Xiaohong Xu
The p-n heterojunctions with the built-in electric field are often adopted to promote the separation of photoexcited electron-hole pairs and enhance the photoelectrochemical (PEC) performance. However, the interface states often affect the band alignment of ZnO/Cu 2 O heterointerface and cause the decline of PEC performance. In this study, the ultrathin insulating Al 2 O 3 layer was introduced to modify the interface between n-type ZnO nanorod arrays (NRA) and p-type Cu 2 O. Compared to that of ZnO NRA/Cu 2 O, the photocurrent density is significantly improved and onset potential shifts negatively for ZnO NRA-Al 2 O 3 /Cu 2 O. The Al 2 O 3 ultrathin layer is deemed to suppress the photoexcited carriers trapped by the heavy interface defect states via improving the interface quality and block the recombination between electrons in the conduction band of ZnO NRA and holes in the valence band of Cu 2 O. This work broadens the interface modification method of p-n heterojunction and its results are favorable for photovoltaic devices, photodetection and PEC water splitting applications.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Ya Nan Wang,Jin Li
ZnO-based semiconductor photocatalysts have emerged from many catalysts and become research hotspots as non-toxic, odorless, and readily available raw materials. Ce-doped ZnO and graphene composites with different concentrations (0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%) were only synthesized by hydrothermal method . The results show that Ce was successfully doped in ZnO by substituting zinc vacancy and compounded with graphene, and distributed uniformly in ZnO lattice. In terms of optical properties , compared with pure ZnO, the absorption of visible light is enhanced, the light response range is widened, the number of electrons that transition back to the ground state is reduced, which indicates that the photocarriers are effectively separated. Compared with the degradation efficiency of pure ZnO (20.28%), ZGCeO series samples showed superior photocatalytic performance, among which ZGCeO2 (2 wt%) samples had the highest photocatalytic activity and catalytic efficiency, and the degradation rate reached 99.12% within 80 min. In this experiment, 2 wt% is the best doping ratio.
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