SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Liupeng Zhao,Rongrong Jin,Chen Wang,Tianshuang Wang,Yanfeng Sun,Peng Sun,Geyu Lu
In this work, we successfully prepare the ZnO-Co 3 O 4 heterostructure on a nanosheet hollow sphere structure. Due to the high redox activity of Co 3 O 4 , the fabricated sensor using 3 at% ZnO-Co 3 O 4 hollow composite exhibits enhanced acetone sensing performance (S = 17.3–50 ppm) at a low operating temperature (150 °C), which is about 5.1 times higher than that of Co 3 O 4 -based sensor (S=3.4–50 ppm). Meanwhile, the ZnO-Co 3 O 4 based sensor shows ppb-level detection limit (S=1.3 at 100 ppb). The reason for the higher sensitivity and lower detection limit of the sensor is that the formation of n-p heterojunctions reduces both the degree of upward band-bending and the surface hole concentration, that allows the sensor to have a higher gas response under the same surface sensing-reactions (surface charge transfer).
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Jiaoyuan Zhang,Rongrong Chen,Jingyuan Liu,Qi Liu,Jing Yu,Hongsen Zhang,Xiaoyan Jing,Milin Zhang,Jun Wang
In this work, superhydrophobic and superoleophilic nickel foam loaded with ZnO@Co 3 O 4 hierarchical structure was successfully fabricated via a simplified one-pot hydrothermal method , followed by a brief calcination process and, finally, superhydrophobically modification with hexadecyltrimethoxysilan (HDTMS). The as-prepared nickel foam showed excellent abrasion resistance , chemical stability and high oil-water separation efficiency. The chemical composition and morphologies were characterized by means of Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The sample we have manufactured proves to be a potential material for the separation of oil-water mixtures.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Mei Li,Shengbo Zhang,Liwen Li,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
The facile synthesis of low-cost, eco-friendly photocatalysts with high charge separation efficiency and CO2 adsorption capacity for efficient photocatalytic CO2 reduction remains a challenge. Herein, a hollow structured p-n heterojunction catalyst, polydopamine (PDA)-ZnO/Co3O4, was successfully synthesized by pyrolyzing bimetallic ZnCo-ZIFs, followed by modification with PDA. Through optimizing the Zn/Co ratio, a high separation efficiency of the photogenerated electron–hole pairs has been achieved. Furthermore, by tuning the content of PDA on the surface of ZnO/Co3O4, the adsorption capacity of CO2 can be maximized. Consequently, PDA15/ZnO/Co3O4 showed a CO production rate of 537.5 μmol/g/h with a CO selectivity of 97.7% without using the photosensitizer and additional sacrificial agent. Band structure based on results of X-ray photoelectron spectroscopy, photoelectrochemical characterization, as well as density functional theory calculation was used to propose a plausible mechanism for photocatalytic CO2 reduction on the PDA15/ZnO/Co3O4. The present study provides an effective approach to fabricate highly efficient photocatalysts based on semiconducting metal oxides for CO2 reduction with remarkable abilities of absorbing lights, separating charge carriers, and adsorbing CO2.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Meiling Zhang,Jing Yu,Jun Wang
Slippery liquid-infused porous surfaces (SLIPSs) are gaining remarkable amount of interest because of their exceptional liquid and solid repellency properties, their tolerance to high pressures and transparency. The lubricant layer may be depleted, leading to the loss of the “slippery” characteristics of the SLIPSs. Herein, we aimed to increase the lubricant storage capacity to enhance the long-term stability of SLIPSs through the construction of a hierarchical structure on the alloy substrates; the SLIPS herein thus represents a new kind of anti-corrosion material. By comparing the wetting speed of the lubricant and shear resistance properties, we showed that SLIPS with a ZnO/Co 3 O 4 /SiO 2 hierarchical structure provided the best lubricant wettability among the samples investigated herein; the lubricant was contained in the interior of this sample, thus providing the highest shear-tolerance observed. We also investigated the anti-corrosion property of SLIPSs that comprised ZnO/Co 3 O 4 /SiO 2 . The hierarchical structure had enough space to store the lubricant, which provided excellent corrosion protection for the alloy substrate.
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
ANALYST
·
2020
·Vol. 146
·期 2
·605-611
·
IF 3.978
Jie Lv,Cong Zhang,Shuangling Wang,Meng Li,Wei Guo
Sensitive detection of copper ions (Cu2+) in biological samples is extremely important since an abnormal level of Cu2+ is linked with many diseases. Herein, we demonstrated a novel turn-on colorimetric sensor for selective detection of Cu2+ both in buffered solution and serum samples based on porous bimetallic transition metal oxide nanocages (ZnO-Co3O4 NCs) as peroxidase mimics. The ZnO-Co3O4 NCs were prepared by using ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) as precursors via direct calcination. With the high peroxidase-like activity, the obtained ZnO-Co3O4 NCs can catalyze the oxidation of tetramethylbenzidine (TMB) in the presence of H2O2 to form a blue colored product. The inhibition effect of cysteine (Cys) on the catalytic activity of ZnO-Co3O4 NCs and its strong binding ability toward Cu2+ enabled the ZnO-Co3O4 NCs/Cys system to be utilized for sensitive detection of Cu2+, in which the catalytic activity of ZnO-Co3O4 NCs/Cys can be recovered by the introduction of Cu2+ with an obvious color change of the solution. The linear range for Cu2+ determination was 2 to 100 nM with a detection limit of 1.08 nM. More importantly, this colorimetric sensor has been successfully applied to detect Cu2+ in serum without pretreatment. Our findings are expected to expand the scope of application of nanozyme and shed light on early disease diagnosis.
研究领域:
生物化学
·
医学诊断
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纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-10
·
IF 5.833
Zhou Xi,Wang Shuangling,Zhang Cong,Lin Yulong,Lv Jie,Hu Shuyang,Zhang Shanshan,Li Meng
A sensitive and rapid colorimetric biosensor has been developed for determination of amyloid-β peptide (Aβ) and study of amyloidogenesis based on the high peroxidase-like activity of porous bimetallic ZnO-Co 3 O 4 nanocages (NCs). Due to the high binding ability of Aβ monomer to ZnO-Co 3 O 4 NCs, the catalytic activity of ZnO-Co 3 O 4 NCs can be significantly suppressed by Aβ monomer. This finding forms the basis for a colorimetric assay for Aβ monomer detection. The detection limit for Aβ monomer is 3.5 nM with a linear range of 5 to 150 nM ( R 2 = 0.997). The system was successfully applied to the determination of Aβ monomer in rat cerebrospinal fluid. Critically, the different inhibition effects of monomeric and aggregated Aβ species on the catalytic activity of ZnO-Co 3 O 4 NCs enabled the sensor to be used for tracking the dynamic progress of Aβ aggregation and screening Aβ inhibitors. Compared with the commonly used thioflavin T fluorescence assay, this method provided higher sensitivity to the formation of Aβ oligomer at the very early assembly stage. Our assay shows potential application in early diagnosis and therapy of Alzheimer's disease (AD).
研究领域:
生物传感器
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医学诊断
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Kun Li,Xiaofang Li,Xiao Chang,Xurong Qiao,Ya Xiong,Fujun Xia,Qingzhong Xue
ABSTRACT The demand of acetone gas sensors with great response value and fast response/recovery time to low concentration acetone is increasing in practical diagnosis for diabetes. In this work, metal-organic frameworks (MOFs) derived flower-like ZnO/Co 3 O 4 heterojunctions based sensor is prepared by a simple solution mixing method at room temperature. The sensor shows high acetone response value, short response/recovery time, excellent selectivity and good stability. For example, the response value of ZnO/Co 3 O 4 heterojunctions based sensor is up to 120 % towards 500 ppb acetone at 300 ℃, which is about 30-fold enhancement than these of intrinsic ZnO and Co 3 O 4 . Moreover, its minimal detection limitation is 100 ppb acetone and it shows ultra-fast response/recovery time for ppb-level acetone (22 s/27 s@500 ppb). The excellent acetone sensing properties of flower-like ZnO/Co 3 O 4 heterojunctions based sensor is attributed to the sharp resistance variation of heterojunction interface between ZnO and Co 3 O 4 and the ultra-fast gas transport channel provided by ZnO nanosheets. This finding provides important insights and useful guidance for the detection of ppb-level acetone.
研究领域:
材料科学
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传感器技术
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医学诊断
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Cong Zhang,Jujie Ren,Yifei Xing,Min Cui,Na Li,Peng Liu,Xiaofang Wen,Meng Li
In this work, PdNPs@ZnO-Co 3 O 4 was synthesized via the facile oxidation treatment of bimetallic ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) followed by in situ chemical reduction of PdNPs on the surface of the nanocrystals. After combined with MWCNTs, the PdNPs@ZnO-Co 3 O 4 -MWCNTs nanocomposites were formed, which were then exploited as novel electrode materials to construct the non-enzyme electrochemical sensors for high-sensitivity detection of tanshinol. Due to the high catalytic activity of multi-metallic PdNPs@ZnO-Co 3 O 4 , and the excellent charge transfer property between imidazole groups of the ligands in MOFs and MWCNTs, the obtained sensor exhibited high sensitivity for tanshinol detection under optimum experimental conditions. The sensor shows two well linear relationship between the current and tanshinol concentration in the range of 0.002–0.69 mM (R 2 = 0.989) and 0.69–3.75 mM (R 2 = 0.994) with the corresponding sensitivity of 59.16 μA mM − 1 and 19.08 μA mM − 1 . And the limit of detection (LOD) was calculated to be 0.019 μM (S/N = 3). Furthermore, with the advantages of good repeatability, stability and selectivity, the fabricated sensor can be successfully applied to measurement of tanshinol in real medicinal liquids samples. Our results would accelerate the applications of MOFs in electrochemical field and provide insights into design of multifunctional non-enzyme sensing materials for various applications in biocatalysis, bioanalysis and drug testing.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zerong Wang,Huimin Yin,Yingli Guo,Yongtao Gao,Junhui Liu,Junhe Han,Mingju Huang
Using solar energy for photocatalytic degradation of pollutants is a clean and effective method for treating the increasingly severe problem of environmental pollution. Herein, porous ZnO/Co 3 O 4 cages with improved charge separation ability was designed via a facile ZIF-8@ZIF-67-derived approach for tetracycline (TC) photodegradation. Great photodegradation performance and good stability were achieved. The degradation rate was as high as 97 % within 60 min. The enhancement mechanism of TC photodegradation was investigated. The porous structure of ZnO/Co 3 O 4 produced a number of active sites. The effective utilized spectrum was extended from the ultraviolet to the red region. The presence of two mixed valence states of Cobalt, Co 2+ and Co 3+ , increased the density of defect states and was conducive to the adsorption of TC. The composite had a Z-scheme heterojunction, in which strong oxidative capacity can be maintained, combination of electrons and holes was greatly reduced and efficient charge transfer occurred. This study would give new insights into the design of new photocatalysts with synergetic enhancement effect for TC photodegradation.
研究领域:
环境科学
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材料科学
·
光催化
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8535-8546
·
IF 2.324
Xiao Jia,Diao Kaidi,Zheng Zhou,Cui Xudong
We report a facile strategy to synthesize porous ZnO/Co 3 O 4 composites by direct pyrolysis of the metal–organic frameworks (MOFs) precursor and their applications to the sensing of acetone at ppb–ppm level. The as-prepared ZnO/Co 3 O 4 sample exhibits enhanced sensitivity (15.17 ppm −1 ), high selectivity towards low-concentration acetone when compared with pure ZnO. The enhancement in gas sensing performance of ZnO/Co 3 O 4 sample could be attributed to the unique porous structure, the p -Co 3 O 4 / n -ZnO junctions effect and the catalytic activity of Co 3 O 4 . The studies might open intriguing perspectives for the design of porous p/n composites for high performance gas sensing applications.
研究领域:
材料科学
·
气体传感
·
纳米材料
·
化学传感器
·
无机化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Lili Lian,Jinyi Lv,Dawei Lou
Multifunctional magnetic microspheres (Mag@ZnO–Co3O4) with bimetal oxide shell were synthesized via a facile method. The Mag@ZnO–Co3O4 composite was characterized through a vibrating sample magnetometer, N2 adsorption analysis, Fourier transform infrared spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy analyses. The structural analysis showed that the as-prepared microsphere possessed a mean diameter of 150 nm, a bimetal oxide shell thickness of ∼10.0 nm, and a magnetic core, which endowed it with good dispersibility, strong magnetism, and excellent adsorption property for oxytetracycline (OTC). Several experimental conditions, such as solution pH, adsorption time, OTC concentration, and ionic strength were systematically investigated. The Mag@ZnO–Co3O4 composite exhibited a fast adsorption rate, that is, the equilibrium was reached within 90 min, when the concentration of OTC was between 10 and 30 mg/L. The composite showed favorable performance for the adsorption of OTC in the pH range 5–9. According to the adsorption isotherms and kinetics, the removal of OTC was efficient and obeyed the pseudo-second-order rate equation and Langmuir adsorption model.
研究领域:
材料科学
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环境科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Jia Liming,Li Xinmei,Yang Rui,Yan Zhiqi
ZnO/Co 3 O 4 nanocomposite fibers were synthesized via electrospinning followed by controlled calcination , and their structural evolution and gas sensing performance were systematically investigated. Comprehensive characterization (XRD, SEM, FTIR, XPS) revealed that calcination temperature critically governs crystallinity, oxygen vacancy concentration, and morphology. The results showed that the prepared ZnO/Co 3 O 4 nanocomposite fibers at the 500 °C calcination temperature exhibited a complete morphology and a high concentration of oxygen vacancy (49 %), which promoted oxygen vacancy adsorption and redox reactions, enabling room-temperature operation with a response of 17.56 and a rapid response/recovery time (25/34 s) toward 500 ppm ethylene glycol at room temperature. Mechanistic studies demonstrated that the p-n heterojunction between n-ZnO and p-Co 3 O 4 facilitates interfacial charge transfer, generating built-in electric fields that enhance carrier mobility. This work provides a scalable strategy for designing energy-efficient gas sensors through synergistic optimization of heterojunction engineering and defect chemistry.
研究领域:
材料科学
·
纳米技术
·
气体传感器
·
功能材料
·
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）