CURRENT APPLIED PHYSICS
·
2018
·
IF 2.058
Ling-yan Li,Shuang-lin Li,Yan Shao,Rui Dou,Bo Yin,Ming-bo Yang
In this work, Polyvinylidene Fluoride (PVDF)/polystyrene (PS)/high density polyethylene (HDPE) ternary blends displayed a core-shell structure where HDPE was the core, PS was the shell, and this core-shell system dispersed in PVDF matrix. Here, multiwall carbon nanotubes (MWCNTs) and ferroferric oxide (Fe 3 O 4 ) was incorporated. F-F composites with MWCNTs was in PS shell and Fe 3 O 4 was in PVDF matrix and E-F composites with MWCNTs was in PS shell and Fe 3 O 4 was in HDPE core were fabricated by melt blending. It was indicated that the core-shell morphology between PS and HDPE was well retained with the incorporation of Fe 3 O 4 and MWCNTs. Both the electrical conductivity of F-F and E-F composites were similar without no obvious change with the incorporation of Fe 3 O 4 . Composites with greater than 20 dB shielding effectiveness were easy to obtain. The highest SE we observed was for the F-F composite with 1 vol% Fe 3 O 4 and 1 vol% MWCNTs was 25 dB at 9.5 GHz, and the SE was over 20 dB in the whole measured frequency(X-band). The E-F composites with SE greater than 20 dB in X-band was at 2 vol% Fe 3 O 4 and 1 vol% MWNCTs. Such effective and lightweight nanocomposites were obtained, resulting from the synergetic effect of MWCNTs and Fe 3 O 4 nanoparticles .
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
Nano-Micro Letters
·
2023
·Vol. 16
·期 1
·1-14
·
IF 26.6
Yang Jianming,Wang Hu,Zhang Yali,Zhang Hexin,Gu Junwei
A layered segregated shielding network was organized in porous PBAT/Fe 3 O 4 @MWCNTs/Ag composite by scCO 2 foaming and scraping techniques.
The composite foam achieved an electromagnetic interference (EMI) shielding effectiveness (SE) of up to 68.0 dB and a reflectivity of as low as 23% due to the “absorption-reflection-re-absorption” shielding mechanism.
The solid and foamed PBAT/Fe 3 O 4 @MWCNTs/Ag composites displayed superior retention (> 92%) of EMI SE even after peeling experiment of 500 times under 100 g weight pressure.
研究领域:
材料科学
·
电磁学
·
环境科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Congcong Yu,Dongyu Hao,Qiao Chu,Ting Wang,Songnan Liu,Tao Lan,Fenghe Wang,Canping Pan
Tea polyphenols, chlorophyll and lutein generally cause strong matrix effects and challenge analysis of trace substances in tea. Seven frequently used adsorbents were chosen to test removal ability for tea polyphenols, chlorophyll and lutein based on the adsorption isotherm fitting. Results showed that MWCNTs-NH 2 demonstrated the strongest removal ability, which may be ascribed to the π-π and electrostatic interaction. Then a method of MWCNTs-NH 2 modified QuEChERS coupled with HPLC-MS/MS detection of 10 organophosphorus pesticide residues in tea was developed and validated. Unlike traditional QuEChERS, only one adsorbent (MWCNTs-NH 2 ) was applied in this method to replace the combined effect of various adsorbents, which improved the easiness and generality of the method. The LOQs were 1.7–9.0 µg/kg. The average recovery rate ranged from 72% to 116% with RSDs less than 14%. This study provides a targeted strategy to develop analysis method for trace substances in a complicated matrix.
研究领域:
分析化学
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食品科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Jinke Song,Guangyue Shi,Xiaoting Song,Zidong Zhang,Yao Liu,Runhua Fan
Composites with negative permittivity behavior have brought about widespread attention for their broad application prospects in electromagnetic field or being used for novel capacitance. In this work, multiwall carbon nanotubes/polyvinylidene fluoride (MWCNTs/PVDF) composites with gradually increasing MWCNT filling content were prepared by hot-pressing in order to acquire negative permittivity. The microstructure, ac conductivity, and real permittivity of the samples were elaborated. As MWCNTs content increases, the percolation phenomenon occurs accompanied by the conversion of conductive mechanism from hopping conduction to free electron conduction. It’s found that negative permittivity property was obtained at a lower filler content and can be regulated by controlling MWCNTs content, which is related to the plasma oscillation state of free electrons in MWCNTs.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ruxia Song,Shihong Zhang,Yi He,Hongjie Li,Yi Fan,Teng He,Yihan Zhang,Yuxin Xiang,Huili Zhang
Ni-Cu/H-MWCNTs composite coatings with outstanding corrosion resistance and high wear resistance were prepared by the pulse electrodeposition technology. The micro-surface morphology and corrosion behavior of the coatings were represented by high-resolution field emission scanning electron microscopy , potential polarization curve, electrochemical impedance spectroscopy and scanning electrochemical microscope. The chemical composition and crystal structure of the coatings were characterized by energy dispersive spectrum, X-ray photoelectron spectroscopy and X-ray diffraction. The mechanical properties are studied by digital microhardness tester and multifunctional material surface testing machine. We found that the successful doping of H-MWCNTs changed the micro-structure and morphology of the Ni-Cu-based coating, making the coating smoother and denser. Furthermore, the average crystallite size of the Ni-Cu/H-MWCNTs (0.5 g/l) composite coating is 13.28 nm. The microhardness and average friction coefficient of the composite coating (0.5 g/l) are 587.04 Hv and 0.178, respectively. It was also found that the composite coating (0.5 g/l) has the best anti-corrosion performance, which is 3.2 times that of the pristine Ni-Cu-based coating. Through SECM diagrams, the composite coating (0.5 g/l) has excellent pitting resistance in 3.5 wt % NaCl solution.
研究领域:
材料科学
·
电化学
·
表面工程
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Shan Luo,Yuanyuan Wang,Xianwen Kan
Ratiometric electrochemical sensing provides a new perspective for the accurate and reliable detection of different analytes since inner reference signal can effectively eliminate the internal and external interferences. There is still a challenge to explore new inner references for the development of ratiometric electrochemical sensing. Herein, a kind of redox-active metal-organic frameworks (Cu-THQ MOFs) was synthesized and characterized by scanning electron microscope, transmission electron microscope, X-ray powder diffractometer, and X-ray photoelectron spectroscopy techniques. Cu-THQ MOFs were composited with carboxylic group functionalized multi-walled carbon nantubes (MWCNTs-COOH) to construct a sensitive electrochemical sensor. The modified Cu-THQ MOFs not only showed good catalytic active to dopamine (DA), but also displayed the constant peak current with the increase of concentration of DA. And a separated oxidation peak potential of about 270 mV between DA and Cu-THQ MOFs can be observed. Accordingly, a current ratio ( i DA /i MOFs ) was employed as readout signal for DA detection with a linear range and limit of detection of 3.0 × 10 −7 – 4.0 × 10 −5 mol/L and 2.6 × 10 −8 mol/L, respectively. Compared with single signal of i DA , ratiometric strategy exhibited high accuracy and reliability for DA determination. The present ratiometric sensing strategy using MOFs as the inner reference may provide a new choice for future development of electrochemical sensors for other analytes reliable determination.
研究领域:
分析化学
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材料科学
·
生物医学
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2023
·
IF 4.1
Yixuan Fan,Runze Yu,Geoffrey I.N. Waterhouse,Ruiqiang Wang,Yufeng Sun,Zhixiang Xu
BACKGROUND Biogenic amines (BAs) in high concentrations are toxic and may cause a series of health symptoms. A sensitive measurement of BA levels is essential for human health. Capillary electrophoresis (CE) has emerged for the separation of eight BAs due to simple sample preparation and highly efficient separation. However, an important drawback for CE is low sensitivity. Magnetic solid-phase extraction (MSPE) has become a technique of interest owing to its brief operation and low solvent consumption. Hence, MSPE as a pretreatment has great potential to improve CE sensitivity for the analysis of BAs in complex food. RESULTS Results showed that the Pt-Co-MWCNTs-COOH possessed strong magnetism, good reusability, and high adsorptive ability toward eight biogenic amines based on the hydrogen bonding between the −COOH of Pt-Co-MWCNTs-COOH and −NH 2 groups of BAs. Using it as an adsorbent, a magnetic solid-phase extraction coupled with capillary electrophoresis (MSPE-CE) method was developed to effectively extract and sensitively analyze eight BAs. Under optimal conditions, the MSPE-CE method has wide linearities (10.0–1000.0 μg L −1 ) and low limits of detection (1.0–6.1 μg L −1 ). The accuracy of the developed method yielded recovery values from 82.07% to 102.58%. Meanwhile, the BAs contents in two samples were analyzed using the MSPE-CE method, with the results consistent with those detected by a high-performance liquid chromatography method. CONCLUSION Given those advantages, the established MSPE-CE method promises the practical guidance of monitoring a variety of BAs and provides a foundation for the detection of other food hazards. © 2023 Society of Chemical Industry.
研究领域:
分析化学
·
食品科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Mingxiang Zhang,Zaihua Duan,Boyu Zhang,Zhen Yuan,Qiuni Zhao,Yadong Jiang,Huiling Tai
Humidity sensor has important applications in environmental and physiological monitoring. With the emergence of self-powered sensor systems , developing self-powered wireless humidity sensor system is highly attractive, but how to realize the humidity sensor with high humidity sensing and power generation performances to achieve self-powered humidity detection system is full of challenges. Herein, we proposed a self-powered electrochemical humidity (ECH) sensor with primary battery structure, using NaCl and hydroxylated multi-walled carbon nanotubes (OH-MWCNTs) as humidity sensing electrolyte, and MnO 2 and Al as electrodes. The hygroscopic and ionic conductivity characteristics of the NaCl/OH-MWCNTs electrolyte endow the ECH sensor with spontaneous voltage generation in a wide humidity range of 10.9–91.5 % relative humidity (RH) at room temperature of 25 °C. Notably, a single ECH sensor can output 1.32 V with a maximal power of 20.52 μW at 91.5 % RH. Furthermore, the ECH sensor can be used for respiratory rate monitoring, non-contact switch and visual humidity indication. As a proof of concept , we successfully designed a prototype of self-powered wireless humidity monitoring system based on ECH sensor. This work not only provides a new strategy for developing high-performance ECH sensor, but also provides a reference for the self-powered wireless humidity monitoring system of the ECH sensor.
研究领域:
传感器技术
·
材料科学
·
环境监测
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xiangxiang Chen,Lu Qiu,Fangzheng Liu,Xiangjie Wei,Haoyu Wu,Junwei Ke,Xinyao Xie,Zhaoyang Zhang,Shiyi Huang,Tianhao Liu
Methane (CH 4 ) is a colorless, odorless, flammable, and explosive gas, making real-time monitoring critical for industrial and public safety. Conventional ZnO-based sensors are hindered by their requirement for elevated operating temperatures (>300 ℃), which severely constrains their practical applicability. To overcome this limitation, MWCNTs/ZnO composites were synthesized via a facile one-step hydrothermal method to enhance CH 4 sensing performance at low operating temperatures. Materials characterization revealed that the MWCNTs/ZnO composite possesses a substantially enhanced specific surface area (114.01 m²/g), approximately 3.5-fold greater than that of pristine ZnO nanosheets. Gas sensing tests demonstrated that the MWCNTs/ZnO composite exhibits a response of 2.21 toward 1500 ppm CH 4 at 50 °C, which is approximately two-fold higher than that of pristine ZnO nanosheets. The developed sensor simultaneously demonstrates exceptional selectivity and favorable humidity resistance. This study provides a new approach for developing low-power, high-sensitivity methane gas sensors. The sensitization performance of MWCNTs for ZnO-based methane gas sensor can be attributed to the geometric and electronic sensitization, as well as abundant active sites.
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2026
·Vol. 132
·期 4
·289
·
IF 3
Wang Jiaming,Cao Ping,Ji Zhengyang,Shan Mingzhe,Yuan Yishan,Song Xiqing,Lu Yaozeng,Tan Surong,Li Zining,Jiang Junlai,Zhang Jing
Piezoresistive wearable electronic devices have great potential in fields such as health detection and human-computer interaction, but traditional devices often fail to recognize pressure changes while maintaining high sensitivity to temperature. In this study, we propose a temperature-recognized piezoresistive pressure sensor based on rGO/MWCNTs@PAN composite film, the strain layer of this sensor is synthesized through electrospinning, the substrate was a high-carbon low-polymer mixture of dimethylformamide (DMF), polyacrylonitrile (PAN), and doped with an excess of multiwalled carbon nanotubes (MWCNTs, 0.6 g), in a high MWCNTs environment, the material as a whole is strengthened, with a more resilient structure. Meanwhile, its unique tubular structure provides a conductive path for the reaction and offers support. Embedding PVA on the substrate surface enhances overall stability and is coated with rGO, under this high-carbon condition, the electrical conductivity is enhanced, making it sensitive to pressure while responding more precisely to temperature changes. Moreover, with the combination of rGO and MWCNTs, the original flexibility can be maintained. The sensitivities of the devices prepared by this method within the ranges of 0–18 kPa, 18–85 kPa and 85–140 kPa are 174.3 kPa − 1 , 32.2 kPa − 1 and 23.5 kPa − 1 respectively, it maintains a high sensitivity to pressure. In addition, the sensor also demonstrated a low detection limit (0.5 Pa), a fast response (200 ms), and maintained a 91% cycle retention rate after 5,000 cycles, and it can accurately identify the temperature within the range of 40 to 70℃. Based on these characteristics, this piezoresistive pressure sensor with temperature recognition can detect in real time a richer range of human health movement indicators, such as finger bending, elbow movement and knee bending, etc. This study indicates that this pressure-temperature sensor has broad application prospects in health monitoring.
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产品关联
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 8
·3003-3010
·
IF 2.054
Zou Jingyi,Sun Xiaogang,Li Rui,He Qiang
The electrochemical performance of fluorinated multiwalled carbon nanotubes (F-MWCNTs) as a new type of conductive agent for Li–SnO 2 batteries has been studied. Multiwalled carbon nanotubes (MWCNTs) were fluorinated to obtain F-MWCNTs with core–shell structure (fluorocarbon atomic ratio C/F = 1:1). The unique tubular structure of the F-MWCNTs allows more Li + ions and electrons to enter the channel around the active material CF 1 , which increases the electrochemical reaction effect and reduces the polarization effect of the batteries, thereby improving the utilization of the active material, and the capacity as well as the stability of the discharge plateau of the resulting batteries. The F-MWCNTs are an excellent alternative to the traditional conductive graphite. The SnO 2 @F-MWCNTs battery showed high specific capacity (1588.71 mAh g −1 at 100 mA g −1 ), excellent cycle performance (962.92 mAh g −1 after 100 cycles), excellent coulombic efficiency (99.89%), and low internal resistance in repeated electrochemical tests.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 2
·285
·
IF 4.329
Lingfei Li,Qiu Sun,Xiangqun Chen,Zhaohua Jiang,Yongjun Xu
The low dielectric constant of the nonpolar polymer poly(1-butene) (PB-1) limits its application as a diaphragm element in energy storage capacitors. In this work, Ba(Zr0.2Ti0.8)O3-coated multiwalled carbon nanotubes (BZT@MWCNTs) were first prepared by using the sol–gel hydrothermal method and then modified with polydopamine (PDA) via noncovalent polymerization. Finally, PB-1 matrix composite films filled with PDA-modified BZT@MWCNTs nanoparticles were fabricated through a solution-casting method. Results indicated that the PDA-modified BZT@MWCNTs had good dispersion and binding force in the PB-1 matrix. These characteristics improved the dielectric and energy storage performances of the films. Specifically, the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film exhibited the best dielectric performance. At 1 kHz, the dielectric constant of this film was 25.43, which was 12.7 times that of pure PB-1 films. Moreover, its dielectric loss was 0.0077. Furthermore, under the weak electric field of 210 MV·m−1, the highest energy density of the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film was 4.57 J·cm−3, which was over 3.5 times that of PB-1 film (≈1.3 J·cm−3at 388 MV·m−1).Keywords:sol–gel hydrothermal method;PDA-modified BZT@MWCNTs nanoparticles;dielectric performance;synergistic effect
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）