JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 12
·7009-7019
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IF 2.047
Ma Xin,Ying Zhihua,Wen Fei,Li Lili,Zheng Xiaolong,Zheng Peng,Wang Gaofeng
Since cobalt-containing spinel oxides have good prospects for the detection of toxic gases, they also have great potential for applications in the field of gas sensors. However, ZnCo 2 O 4 -based gas sensors have the disadvantages of low response values and poor selectivity in formaldehyde detection. In this study, we attempted to prepare formaldehyde gas sensors by varying the addition of sodium citrate for hydrothermal synthesis of ZnCo 2 O 4 . During the fabrication process, it was found that an appropriate amount of sodium citrate content could produce ZnO on the surface of ZnCo 2 O 4 , and that the gas sensitivity of ZnO-ZnCo 2 O 4 to formaldehyde was better compared to that of pure ZnCo 2 O 4 . The sensor has a response rate of 17 at 20 ppm formaldehyde at 200°C. It also has good selectivity, repeatability, and stability. These results can provide foundational knowledge for the implementation of spinel oxide materials in the field of gas sensors.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 8
·1027
·
IF 2.67
Ningzhe Yan,Hao Luo,Yanan Liu,Haiping Yu,Guangyin Jing
Regulating the swimming motility of bacteria near surfaces is essential to suppress or avoid bacterial contamination and infection in catheters and medical devices with wall surfaces. However, the motility of bacteria near walls strongly depends on the combination of the local physicochemical properties of the surfaces. To unravel how nanostructures and their local chemical microenvironment dynamically affect the bacterial motility near surfaces, here, we directly visualize the bacterial swimming and systematically analyze the motility ofEscherichia coliswimming on ZnO nanoparticle films and nanowire arrays with further ultraviolet irradiation. The results show that the ZnO nanowire arrays reduce the swimming motility, thus significantly enhancing the trapping ability for motile bacteria. Additionally, thanks to the wide bandgap nature of a ZnO semiconductor, the ultraviolet irradiation rapidly reduces the bacteria locomotion due to the hydroxyl and singlet oxygen produced by the photodynamic effects of ZnO nanowire arrays in an aqueous solution. The findings quantitatively reveal how the combination of geometrical nanostructured surfaces and local tuning of the steric microenvironment are able to regulate the motility of swimming bacteria and suggest the efficient inhibition of bacterial translocation and infection by nanostructured coatings.Keywords:ZnO nanowire arrays;bacteria motility;antibacterial;particle tracking
研究领域:
微生物学
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材料科学
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DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 12
·1883
·
IF 2.972
Zhuhua Xu,Yanfei Lv,Feng Huang,Cong Zhao,Shichao Zhao,Guodan Wei
Monolayer tungsten disulfide (2D WS2) films have attracted tremendous interest due to their unique electronic and optoelectronic properties. However, the controlled growth of monolayer WS2is still challenging. In this paper, we report a novel method to grow WS2through chemical vapor deposition (CVD) with ZnO crystalline whisker as a growth promoter, where partially evaporated WS2reacts with ZnO to form ZnWO4by-product. As a result, a depletion region of W atoms and S-rich region is formed which is favorable for subsequent monolayer growth of WS2, selectively positioned on the silicon oxide substrate after the CVD growth.Keywords:monolayer WS2;ZnO;CVD;controlled growth
研究领域:
材料科学
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 13
·5371-5386
·
IF 3.5
Cai Haopeng,Lin Zhenqin,Gao Lihua,Feng Chaochao,Tang Rui
Abstract The derivatives of metal–organic frameworks have been proven to be ideal candidates for microwave absorption due to their ability to form diverse microstructures of metals/heteroatom doped-carbon composites. In this study, we synthesized three types of zinc oxide (ZnO)@ZIF-8 with varying ZIF-8 shell thicknesses using ZnO colloidal spheres as sacrificial templates. Subsequently, we investigated the microwave absorption properties of a series of non-magnetic ZnO/N-doped carbon nanospheres pyrolyzed by ZnO@ZIF-8 at different temperatures. Remarkably, the non-magnetic samples (30 wt% filler loading) with a hollow structure pyrolyzed at 800 °C exhibited a broad effective absorption band exceeding 6 GHz. The excellent microwave absorbing performance of the samples pyrolyzed at 800 °C can be attributed to the reduction of the ZnO core to Zn 0 , anchoring it in the graphitized N-carbon layer, and the formation of an inner hollow cavity that enhances impedance matching. Therefore, this research not only provides an array of excellent dielectric-type microwave absorbing materials but also presents a novel strategy for developing lightweight and high-performance non-magnetic carbon-based microwave absorbing materials. Graphical abstract
研究领域:
材料科学
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电磁材料
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微波工程
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DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5760-5770
·
IF 4
Shouli Bai,Shiyu Jia,Yingying Zhao,Yongjun Feng,Ruixian Luo,Dianqing Li,Aifan Chen
Photoelectrochemical (PEC) water splitting has been recognized as the most promising approach for directly converting solar energy into chemical energy, and substantial efforts have been made to develop a highly efficient and low-cost photoanode for enhancement of PEC water splitting efficiency due to sluggish water oxidation reaction kinetics. A ternary NiFePB-modified ZnO/BiVO4 heterojunction photoanode was simply assembled by low-temperature hydrothermal, metal–organic decomposition and electrodeposition methods to improve the water splitting efficiency; its photocurrent density for water oxidation reached 1.66 mA cm−2 at 1.23 V (vs. RHE); in comparison, that of ZnO is only 0.4 mA cm−2. The onset potential manifests a cathodic shift of ∼283 mV compared to ZnO. The IPCE and the ABPE respectively are 3.1 and 6.4 times those of ZnO, respectively. This improvement is ascribed to the efficient separation of photogenerated electrons and holes by the formation of a heterojunction between ZnO and BiVO4 and the enhancement in the oxygen evolution reaction kinetics by the decoration of the co-catalyst NiFePB as a hole acceptor.
研究领域:
材料科学
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能源转换与储存
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DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Zepeng Fang,Dagui Chen,Fengpo Yan,Jiangquan Lv,Yongjing Wang,Xiangfeng Guan
The water monitoring parameter of chemical oxygen demand (COD) is a universal way to assess organic pollution in aqueous systems. Though the ways for the detection of COD have been developed for decades, it is still a challenge to achieve highly sensitive and portable COD detectors. In this work, a new electrode composite of Ni/ZnO/Cu (CE-1) was prepared for the electrochemical tests of COD. The electrode was structural characterized by using scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray Diffractometer (XRD), which showed that self-supported Cu microflowers were successfully electrodeposited on the ZnO micro-prims that were firstly loaded on the Ni foils. The electrochemical behaviors were investigated with the comparison of CE-1 and the electrode that Cu nanoparticles were directly deposited on the Ni foil (CE-2). It shows that CE-1 possesses much superior electrochemical properties than CE-2, which indicates that the introduction of ZnO micro-rod the electrode can significantly enhance the electrocatalysis property. CE-1 exhibited a linear COD detection range of 2.3603 to 577.8 mg/L as well as an excellent correlation with the classic dichromate method (R 2 = 0.99933). Moreover, low detection limit of 0.6036 mg/L (the signal blank/slope=3) and high sensitivity of 2.403 × 10 −2 mA / (mg • L −1 ) can be simultaneously achieved by using CE-1, which is hard to attain for its counterparts reported in literature. CE-1 also shows good concordance with the classic method for real water sample detections. Consequently, the environmentally friendly CE-1 is supposed as a promising candidate for COD detection electrode.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 7
·3471-3480
·
IF 3.925
Qichang Zhang,Yanmin Jia,Jing Chen,Xiaoxing Wang,Luohong Zhang,Zhi Chen,Zheng Wu
In this work, the construction of heterostructures is considered to be an outstanding method to enhance the decomposition ratio in the piezocatalysis process. Piezoelectric BiFeO3/ZnO heterostructure nanomaterials synthesized via a mixing–calcining method exhibit an enhanced piezocatalysis performance through collecting vibration energy to decompose rhodamine B (RhB) dye. After undergoing 180 min vibration, with the different ZnO contents of 0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt% and 5 wt%, the BiFeO3/ZnO heterostructures can respectively decompose 73.4%, 87.0%, 96.9%, 92.9%, 67.9% and 55.1% RhB dye. The kinetic rate constant of the RhB dye decomposition is 21.0 × 10−3 min−1 for the BiFeO3/2%ZnO heterostructures, while it is only 7.37 × 10−3 min−1 for the BiFeO3. The reason for the enhanced piezocatalytic dye decomposition ratio may be that the heterostructure effectively separates the positive and negative charges to reduce the recombination of the positive and negative charges. These main medium active species such as hydroxyl radicals (˙OH) in the process of piezocatalysis are confirmed on the basis of the results of both electron spin resonance and active species capture experiments. The BiFeO3/ZnO heterostructures, with a strongly enhanced piezocatalytic dye decomposition performance, offer a promising option to treat wastewater through collecting environmental vibration energy in the future.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5563
·
IF 4.6
Yayang Wang,Ziyi Liu,Yuesheng Li,Xiaojie Yang,Lingfei Zhao,Jian Peng
The development of a stable and highly active photocatalyst has garnered significant attention in the field of wastewater treatment. In this study, a novel technique involving a facile stirring method was devised to fabricate an array of g-C3N4/ZnO nanowire (ZnO NW) composites. Through the introduction of g-C3N4to augment the generation of electron-hole pairs upon exposure to light, the catalytic efficacy of these composites was found to surpass that of the pristine ZnO NWs when subjected to simulated sunlight. The photocatalytic performance of a 20 mg·L−1methylene blue solution was found to be highest when the doping rate was 25 wt%, resulting in a degradation rate of 99.1% after 60 min. The remarkable enhancement in catalytic efficiency can be ascribed to the emergence of a captivating hetero-junction at the interface of g-C3N4and ZnO NWs, characterized by a harmoniously aligned band structure. This alluring arrangement effectively curtailed charge carrier recombination, amplified light absorption, and augmented the distinct surface area, culminating in a notable boost to the photocatalytic prowess. These findings suggest that the strategic engineering of g-C3N4/ZnO NW heterostructures holds tremendous promise as a pioneering avenue for enhancing the efficacy of wastewater treatment methodologies.Keywords:g-C3N4;ZnO NW;heterostructure;photodegradation
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Qi Qi,Sujuan Liu,Xing Li,Chunlong Kong,Zhiyong Guo,Liang Chen
This report describes the controllable encapsulation of ZnO nanoparticles with N-doped nanoporous carbon (N-NpC) via a simple fabrication and calcination of ZnO@ZIF-8 (zeolitic imidazolate framework). In the fabrication of ZnO@ZIF-8, ZnO was used both as the support and Zn source for the formation of ZIF-8. After calcination under N 2 atmosphere, the ZnO@N-NpC core-shell heterostructures were formed and characterized by IR, UV–vis, XRD , XPS , scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As expected, the well-defined ZnO@N-NpC core-shell nanospheres demonstrated distinct photocatalytic activity and adsorption capacity in response to the dye methylene blue (MB) in aqueous solution, and the degradation efficiency of MB is up to 99% under UV irradiation for 20 min after catalysts were reused for 5 cycles and stored for two months. Therefore, it is reasonable to believe that the ZnO@N-NpC core-shell heterostructures are new-type nanomaterials for photodegradation of the organic pollutants from wastewater.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
·
2025
·Vol. 29
·期 11
·e70636
·
IF 4.2
Hao Zhang,Guoyan Liu
Gastric cancer is a common malignant tumour. Copper‐induced cell death, a recently discovered form of metal ion‐related cell death, has garnered significant attention from researchers. We synthesised a multifunctional nanoparticle, ZnO@CuEA, and characterised its morphology using transmission electron microscopy. Cytotoxicity was analysed via CCK8 assays and calcein‐AM staining. The tumour‐targeting capability of ZnO@CuEA was validated using confocal microscopy and in vivo imaging experiments. RNA‐seq and proteomic analysis were conducted to assess changes in mRNA and protein expression before and after ZnO@CuEA treatment. Lysosomal β‐galactosidase staining was employed for cellular senescence detection, and protein expression levels were analysed via Western blot. Finally, in vivo experiments demonstrated the tumour‐inhibitory effect of ZnO@CuEA. ZnO@CuEA is a multifunctional nanoparticle capable of targeting tumour cells and inducing cuproptosis. In vivo experiments showed that ZnO@CuEA exhibits significant antitumor activity. The multifunctional nanoparticles synthesised in this study provide a novel therapeutic approach for cancer treatment.
研究领域:
肿瘤学
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分子生物学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 7
·e4411
·
IF 3.581
Xin Jin,Guangrong Liu,Chongzhuo Bao,Mingxin Chen,Qiang Huang
The high dispersion and stability of a nanocomposites suspension are required as a crucial factor in many of their applications. In this study, ZnO nanosheets covered with polyaniline (PANI) thin layer (ZnO@PANI) were synthesized by a simple in-situ polymerization. The as-prepared ZnO@PANI powders were well characterized by XRD, Raman, FTIR, XPS and photoluminescence spectra, as well as SEM and TEM techniques. The effect of PANI incorporation on the chemical dissolution and dispersing stability of ZnO aqueous suspension was investigated. Dissolution experiments showed that the dissolution of ZnO was effectively restrained by the surface-hybridized PANI layer. ZnO@PANI suspension can be more stable in a wider pH range. Dynamic Light Scattering (DLS) analysis indicated that ZnO@PANI particles were thoroughly dispersed in the neutral and alkaline solution as proven by the emergence of a single distribution with a high diffused intensity. Sedimentation experiments suggested that ZnO@PANI suspension was a more stable dispersion taking into account the effect of pH and ionic strength.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 31
·1-15
·
IF 2.8
Zhang Yuhong,Liu Yanchang,Qu Zhihao,Liu Junlong,Tian Siye,Liu Hang
In this paper, AuPd alloy nanoparticles (NPs) are prepared by co-reduction method using double reducing agents. Different mass percentages of AuPd alloy NPs loaded ZnO nanomaterials are prepared by classical impregnation method. The gas sensing properties of the sensor are studied. 0.5 wt% AuPd–ZnO exhibits a higher gas sensing response (Ra/Rg = 32, 50 ppm ethanol), which is 1.88 times that of ZnO gas sensing response. At the same time, the response/recovery time is 2 s/29 s. Compared with ZnO, the recovery time is reduced by 55 s. At last, the sensing mechanism in the process of gas sensing test is analyzed based on AuPd alloy NPs and ZnO.
研究领域:
材料科学
·
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）