VACUUM
·
2025
·
IF 3.9
Xiaoli Ji,Fan Chen,Jian Liu,Qianqian Ma,Zhihao Xu,Ruochen Qiao
In this paper, MWCNTs/Si 3 N 4 binary composites were synthesized using a chemical click method, establishing a foundation for the in situ polymerization of MWCNTs/Si 3 N 4 /PPy ternary composites. The morphology, electrical conductivity, and electromagnetic parameters of the composites were characterized using scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and infrared analysis. The wave-absorbing properties of the composites were assessed with a vector network analyzer. The impact of varying feeding ratios on the absorption properties of the composites was investigated. The results indicated that as the amount of PPy increased, the minimum reflection loss of the nano-hybrid materials initially decreased before subsequently increasing. When the feeding ratio of MWCNTs: Si 3 N 4 : PPy was set at 2:1:4 and the thickness of the absorption layer was 2.5 mm, the minimum reflection loss (RL min ) reached −40.14 dB, while the maximum absorption bandwidth (EAB max ) attained 6.88 GHz (d = 2.0 mm). Compared to MWCNTs/Si 3 N 4 binary materials, the ternary materials demonstrated enhanced electromagnetic absorption capabilities. The numerous heterogeneous interface formed by MWCNTs, Si 3 N 4 , and PPy facilitates charge accumulation, creating a structure similar to a capacitor that induces interface polarization and attenuates electromagnetic waves (EMWs) by aligning polar bonds or charges in response to an alternating electric field. Additionally, the MWCNTs/Si 3 N 4 binary nanohybrid materials exhibit a larger surface area following PPy coating, which further enhances impedance matching, extends the propagation distance of EMWs, and improves their dissipation. These research results are of great significance for the production of absorbent composite materials and provide new ideas for the design of absorbent materials.
研究领域:
材料科学
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纳米技术
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电磁学
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高分子化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Haiyan Zhao,Yi Zhou,Shanshan Li,Kemei Shi,Na Li,Min Cui,Cong Zhang
Hydrogen peroxide (H 2 O 2 ) is an important reactive oxygen species, and its abnormal concentration can cause cell distortion and apoptosis, leading to occurrence of various diseases. Therefore, real-time and sensitive monitoring of H 2 O 2 is essential for early disease diagnosis and pathological research. Herein, a novel nanocomposite of Fe-porphyrin covalent organic frameworks decorated with molybdenum disulfide and multi-walled carbon nanotubes (Fe-pCOFs/MoS 2 -MWCNTs), which had glorious enzyme-like activity, was reported for efficient electrochemical detection of H 2 O 2 . The prepared Fe-pCOFs nanosheets with a large specific surface area and fully dispersed Fe 2+ active sites, could enhance mass transfer and atomic utilization, thereby contributing to excellent catalytic efficiency toward H 2 O 2 . The flower-like MoS 2 nanoflakes not only could catalyze the reduction reaction of H 2 O 2 , but also could serve as co-catalyst and form a catalytic cycle with Fe 2+ of Fe-pCOFs, contributing the continuous emergence of catalytic active sites. The highly conductive MWCNTs was employed to promote electron transfer rate. Ultimately, the obtained Fe-pCOFs/MoS 2 -MWCNTs exhibited excellent electrocatalytic activity and conductivity, significantly amplifying the H 2 O 2 response signal. Under the optimal conditions, the sensor had a wide detection range from 20 to 2650 μΜ for H 2 O 2 with a detection limit as low as 2.2 μΜ. Moreover, the sensor successfully recorded trace amounts of H 2 O 2 released from RAW264.7 cells, showing promising application for real-time and sensitive monitoring of H 2 O 2 in clinic or pathological research.
研究领域:
生物医学工程
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分析化学
·
病理学
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产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Nana Tang,Yanping Wei,Quanguo He,Shuting Shi,Chuanqin Zhou,Aiting Chen,Jun Liu
A novel and facile electrochemical determination of Sertraline at nanomolar concentration using bimetallic MXene NbTiCT x and MWCNTs hybridized electrodes as sensing platforms is demonstrated. NbTiCT x /MWCNTs composites were produced by etching NbTiAlC to obtain NbTiCT x , and ultrasonically mixing this with MWCNTs. An electrochemical sensor based on NbTiCT x /MWCNTs nanocomposite modified (NbTiCT x /MWCNTs/GCE) was constructed, for use in the sensitive detection of Sertraline (SER). The successful preparation of NbTiCT x /MWCNTs and the electrochemical performance of the electrodes were verified by Scanning electron microscopy, X-ray diffraction, cyclic voltammetry and electrochemical impedance characterization methods. The experimental results show that NbTiCT x /MWCNTs/GCE can increase the SER oxidation peak current, with two good linear relationships (R 2 = 0.9910 and 0.9967) between the current and the concentration of SER (5.0–10.0 μM and 10.0–100.0 μM), with a detection limit of 0.16 μM (S/N = 3). The sensor has good selectivity, repeatability, reproducibility and stability, and enables the sensitive determination of SER in human serum and urine samples of clinical biological fluids. It is believed that this work is significant and is of broad interest for work in innovative material development and biomedical applications.
研究领域:
材料科学
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生物医学工程
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分析化学
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Dan Wu,Xiang Ren,Lihua Hu,Dawei Fan,Yang Zheng,Qin Wei
A highly sensitive electrochemical adenosine aptasensor was fabricated by covalently immobilizing 3′-NH 2 -terminated capture probe (SSDNA1) and thionine (TH) on Au–GS modified glassy carbon electrode. 3′-SH-terminated adenosine aptamer (SSDNA2) was adsorbed onto palladium/copper alloyed supported on MWCNTs ( [email protected] )-conjugated multiple bienzymes, glucose oxidase (GOx), and horseradish peroxidase (HRP) (SSDNA2/ [email protected] /HRP/GOx). Then, it was immobilized onto the electrode surface through the hybridization between the adenosine aptamer and the capture probe. The signal was amplified based on the gradual electrocatalytic reduction of GOx-generated hydrogen peroxide by the multiple HRP through the mediating ability of the loaded multiple TH. However, the peak current of TH decreased in the presence of adenosine because the interaction between adenosine and its aptamer made SSDNA2/ [email protected] /HRP/GOx release from the modified electrode . Various experimental parameters have been optimized for the detection of adenosine and tests for selectivity , reproducibility and stability have also been performed. Under the optimal condition, the proposed aptasensor displayed a wide linear range (10–400 nM) with the low detection limit (2.5 nM), which has been applied in human serum samples with satisfactory results. Thus, the combination of Au–GS as a sensor platform and [email protected] /HRP/GOx as labels can be a promising amplification strategy for highly sensitive adenosine detection.
研究领域:
生物传感器
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分析化学
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医学检测
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-11
·
IF 6.232
Tang Tingting,Yang Fan,Wang Lina,Zhao Chunxin,Nie Fei,GuopingYang
An ultrasensitive sandwich electrochemiluminescence (ECL) biosensor was designed for determination of concanavalin A (ConA) through the specific carbohydrate-ConA interactions. Three-dimensional porous metal-organic framework (Zn-MOF) was synthesized, which loaded a large amount of luminescent reagents as luminol by encapsulating into its pores to form Zn-MOF@luminol complex. Interestingly, Zn-MOF also acted as the coreactant accelerator in the luminol-H 2 O 2 ECL system. This Zn-MOF@luminol complex was used as the signal probe to achieve a super strong and stable ECL signal. In addition, three-dimensional hierarchical molybdenum disulfide nanoflower and multiwalled carbon nanotubes complex (MoS 2 NF@MWCNTs) with peroxidase-mimicking enzyme property were used as a substrate to modify the glassy carbon electrode to further enhance the ECL signal of luminol by promoting decomposition of H 2 O 2 into reactive oxygen species (ROSs). In addition to the horseradish peroxidase (HRP) catalysis effect on the luminol ECL signal, a triple amplified ConA sandwich ECL sensor with high sensitivity sensor was constructed. The linear range for ConA detection was from 0.5 pg/mL to 100 ng/mL with a detection limit of 0.3 pg/mL ( S / N = 3). The recovery test for ConA in human serum samples was performed with satisfactory results.
Graphical abstract
研究领域:
生物传感器
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分析化学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 4
·1-7
·
IF 2.009
Xie Chong,Shi Jian-Wen,Yang Shenghui,Li Xifei
The MnO x -TiO 2 /MWCNTs nanocomposites were used as De-NO x catalysts to study the deep-rooted reason for the deactivation. Based on a series of characterization on as-prepared catalyst and poisoned catalyst, the results showed that the chief culprit for the deactivation is the micropores in the De-NO x catalyst. The formed ammonium (bi)sulfate in the micropores during the SCR reaction process could not be took away by the gas flow soon and then deposited on the catalyst surface gradually, and further covered the active sites. And the poisoned catalysts could be recovered partly rather than fully by heat treatment at 500 °C because of the decomposition of the ammonium (bi)sulfate and the phase transition of the TiO 2 .
研究领域:
环境催化
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纳米材料科学
·
大气污染控制
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 71
·期 3
·301-309
·
IF 2.99
Xusheng Huang,Qingsong Liu,Wencheng Zhang,Zeyu Wu,Yunchun Wang,Jianwen Li,Baoyi Xiong,Zhaojun Xian
The preparation of raw materials is an important prerequisite for studying the function of natural active ingredients. Here, the preparation of MWCNTs/ZIF-67@MIPs based on surface molecular imprinting technology for the separation of bilobalide (BB) from real samples was proposed. The successful preparation of MWCNTs/ZIF-67@MIPs was demonstrated using several techniques. Adsorption equilibrium was achieved when the time was 4 h, and the rate of adsorption calculated from the dynamic adsorption results was 14.2 μg mL –1 h –1 . The maximum adsorption amount for MWCNTs/ZIF-67@MIPs of BB was calculated to be 59.2 mg g –1 , which was more than three times that for MWCNTs/ZIF-67@NIPs (23.1 mg g –1 ), and the Freundlich isotherm model and pseudo-second-order kinetic model were more suitable for the explanation of isothermal and kinetic adsorption behaviors, respectively. The results of selective adsorption indicated that MWCNTs/ZIF-67@MIPs show excellent selectivity and specificity for BB compared to structurally similar compounds such as ginkgolides A, B and C, with an excellent imprinting factor (2.83). The results of reuse studies indicated that MWCNTs/ZIF-67@MIPs exhibited great reproducibility with a recovery rate of 70.8% after repeated use for five times. Finally, the developed MWCNTs/ZIF-67@MIPs were used as a solid-phase extraction sorbent to directly separate BB from treated gingko leaf extract and crude extract of BB, and the results suggested that the purity of BB in the two samples was increased by about 30%, and the recoveries reached 68.34% and 71.54%, respectively. Meanwhile, the separation effect of MWCNTs/ZIF-67@MIPs on BB was better than that of BBMIP prepared by bulk polymerization. © 2021 Society of Industrial Chemistry.
研究领域:
分析化学
·
天然产物化学
·
材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Hong Ke,Xin Zhang,Weiwei Guo,Amin Zhang,Zhiming Wang,Chusen Huang,Nengqin Jia
Electrochemiluminescent (ECL) assay has gradually drawn increasing interest to be considered as one of the potential strategies to be applicable in a wide range of medicine target determination. In this protocol, a facile and ultrasensitive ECL sensor platform was developed aiming at rapidly quantitative detection of polyphenolic flavonoids based on multiwall carbon nanotubes (MWCNTs)/platinum nanoparticles (PtNPs) nanohybrids/nafion/Ru(bpy) 3 2+ modified glassy carbon electrode (GCE) in Ru(bpy) 3 2+ /tri- n -propylamine (TPA) co-reaction system. Attributed to the synergistic ECL signal amplification of both PtNPs and MWCNTs facilitating the electron transfer, this proposed sensor could sensitively analyze the flavonoids through an annihilation ECL emission mechanism since the less generated amount of excitation state Ru(Ⅱ)* on account of the principle that flavones are prone to donate electrons and scavenge free radicals to further show a competitive relationship with Ru(Ⅲ) on the reaction with TPA*. The influences of pH, Ru(bpy) 3 2+ absorption time and TPA co-reactant concentration were investigated and the sensor exhibited a linear response to flavonoids when the concentration ranges from 6.50×10 –11 to 1.00×10 −7 M with a detection limit (LOD) of 2.17×10 –11 M (S/N=3) upon the optimized conditions. Furthermore, high sensitivity, excellent stability and reproducibility were verified to declare the promise for being applicable to analyze the flavones content in real flavones medicine samples and ginkgo leaves extracts with satisfactory results.
研究领域:
分析化学
·
纳米技术
·
药物分析
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2024
·
IF 2.6
Nanfei Yang,Yuncheng Bei,Yahong Huang,Wei Zheng,Jiehua Ma,Jiangqiong Ke
Serum Cystatin C (CysC) is an impressive marker for early diagnosis of renal dysfunction. In this work, we established a novel electrochemical immunosensor based on Fe 3 O 4 /AuNPs-MWCNTs@PDA nanocomposite for the detection of CysC. The Fe 3 O 4 /AuNPs-MWCNTs@PDA nanozyme complex by polydopamine encapsulation can not only carry massive detection antibodies, but also bind the electroactive substance toluidine blue (TB) through electrostatic adsorption. By immobilizing AuNPs onto the electrode to bind the capture antibody (Ab1), we constructed a sandwich electrochemical immunosensor with low cost, high sensitivity, and repeatability. The detection range is 3.9–125.0 ng/mL with a significant linear relationship between the current peak difference (ip) and logarithm of the CysC concentration. Moreover, the detection limit of the immunosensor is 0.157 ng/mL. We have successfully utilized this novel immunosensor to detect CysC in human serum samples, and these results have implications for its potential use in clinical application.
研究领域:
生物医学工程
·
分析化学
·
临床诊断
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DOI
PubMed
高影响因子
Food Analytical Methods
·
2023
·
IF 2.9
Shen Jinhui,Liu Juan,Yang Siyi,Yao Xin,Fa Huanbao,Hou Changjun,Yang Mei
This work established a novel nucleic acid aptamer sensor for the sensitive and selective detection of AFB1 (Aflatoxin B1), which has important implication for food safety. In a word, we synthesized MXene/MWCNTs/NiCo 2 O 4 composite nanomaterials to improve the sensitivity of the aptamer sensor. The surface of the composite nanomaterials was modified with PDA (poly dopamine) in order to immobilize the NH 2 -cDNA-aptamer complex on the electrode surface by the Schiff base reaction. Characterization of MXene/MWCNTs/NiCo 2 O 4 nanocomposites was carried by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Meanwhile, 4-carboxy-2,2,6,6-tetramethylpiperidine 1-oxyl free radical (TEMPO-COOH) was used as an electrochemical signal to detect AFB1. Under optimal conditions, the electrochemical DPV signal decreased with increasing AFB1 concentration, ranging from 2.5 to 200 ng/mL, and the lowest limit of detection (LOD) at 1.890 ng/mL (S/N = 3). In addition, the ensemble sensor showed great reproducibility, stability, and selectivity, which has been successfully applied to the determination of AFB1 in maize flour and maize residue samples with recoveries in the 92.2 ~ 109.8% range. Compared to other detection methods for AFB1, this approach afforded comparable detection limits and detection ranges, in reduced analysis time (within 5 min). Thus, a time-saving, sensitive, and selective approach was achieved for the rapid determination of AFB1 in food.
研究领域:
食品安全
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分析化学
·
生物传感技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yinghong Zhu,Ziying Chen,Jianqing Zhang,Qianqian Wu,Chun’an Ma,R. Daniel Little
An EmimAc/MWCNTs composite was prepared and characterized through SEM and TEM . The MWCNTs were well dispersed after combining with alkaline EmimAc . The activity of the composite was demonstrated by CV and controlled potential electrolysis. The composite could be used independently as electrolyte or electrode and showed excellent activity toward the electro-oxidation of the C H bond of benzylic systems, and did so at a lower oxidation potential than when using EmimAc or MWCNTs . After modification, the pH value of the composite was adjusted to the acid range, and the yield of aldehyde adducts obtained through electro-oxidation improved.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaohan Xing,Can Wang,Xiao Du,Fengfeng Gao,Xiaogang Hao,Abuliti Abudula,Guoqing Guan
A novel carbon nanotube combining bis(2-ethylhexyl) phosphate/tributyl phosphate membrane (MWCNTs-P204/TBP membrane) with dual-site extraction function was obtained by constructing a dense P204/TBP liquid phase extraction layer in a 3D porous MWCNTs membrane and proposed a “chemical-electrochemical dual site extraction” mechanism that consists both the chemical extraction dominated by proton exchange and electrochemical extraction dominated by electrochemical complexation pathways. The membrane was applied with an electrochemically switched ion membrane extraction (ESIME) process to realize continuous selective extraction/stripping of Nd 3+ . Model calculation and DFT simulations indicate that the mass transfer rate of Nd 3+ in the feed phase is 7.45 times higher than that of Dy 3+ under the action of the electric field, and the chemical softness of P204 and Nd 3+ extraction complex 15.15 is higher than that of Dy 3+ 2.73, the coupling effect of cell voltage and pulse potential can effectively facilitate the selective extraction and stripping of Nd 3+ by MWCNTs-P204/TBP membrane. The Nd 3+ flux as high as 7.31 μmol·m −2 ·s −1 with a separation factor β Nd 3+ /Dy 3+ of 9.56 was achieved even after five times enrichments. It manifested that the ESIME system with MWCNs-P204/TBP membrane provides a scalable process for the continuous selective separation of Nd 3+ from waste permanent magnets.
研究领域:
材料科学
·
环境工程
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）