Food Analytical Methods
·
2019
·Vol. 12
·期 10
·2326-2333
·
IF 2.413
Zhang Wen,Liu Chao,Zou Xiaobo,Zhang Han,Xu Yiwei
This work introduces a β-cyclodextrin/multi-walled carbon nanotube (β-CD/MWCNT)–modified microelectrode array (MEA) for rapid determination of imidacloprid in vegetables. The MEA, fabricated on a silicon wafer, contains 20 parallel-connected working electrodes, a counter electrode and a reference electrode. The MWCNT is drop-casted onto the working electrode area, and β-CD is decorated onto the MWCNT layer with electropolymerization. Electrochemical behaviors of the as-fabricated sensor are investigated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Obtained results validate that the proposed sensor has a large electroactive area, great electrical conductivity, and high sensitivity. During preparation and application of the sensor, 0.5 mg mL −1 MWCNT suspension and phosphate-buffered solution (0.1 mol L −1 , pH = 7) are found to optimize experimental conditions. Under optimized conditions, a wide linear range as 5 to 100 μmol L −1 is obtained for target imidacloprid, and the limit of detection (LOD, S/N = 3) is well defined as 0.629 μmol L −1 . The sensor is used for sensing imidacloprid in cabbage, cucumber, and tomato. The results from this method are in accordance with high-performance liquid chromatography-mass spectrometry (HPLC-MS) data.
研究领域:
分析化学
·
环境科学
·
农业科学
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DOI
高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Yulong Wei,Shaojie Zhang,Jiahui Lyu,Weihao Zeng,Haoyue Ma,Xianyang Zhang,Cheng Chen,Yinyu Xiang,Shichun Mu,Zongkui Kou
Lithium–sulfur (Li–S) batteries are promising candidates for next-generation energy storage systems, yet their practical implementation is severely hindered by the shuttle effect of soluble lithium polysulfides (LiPSs) and sluggish multistep sulfur redox kinetics. Here, we design a ZnCoNi zeolitic imidazolate framework (ZnCoNi-ZIF) that is in situ grown on acid-treated multiwalled carbon nanotubes (MWCNTs) and subsequently carbonized to afford an N-doped carbon/MWCNT composite embedded with Zn–Co–Ni nanoparticles (denoted as ZnCoNi-NC@MWCNT). This composite is employed as a functional coating on commercial polypropylene separators. The cooperative effect of trimetallic active sites and the conductive carbon matrix endows the separator with polar M-Nx and pyridinic N sites, a high-surface-area mesoporous architecture, and continuous electron pathways, enabling physical confinement, chemical anchoring, and electrocatalytic conversion of LiPSs. Specifically, uniformly distributed Zn–Co–Ni nanoparticles act as electrocatalytic centers to accelerate the reversible multistep sulfur transformation, while the synergistic interplay among these components mitigates the shuttle effect and reinforces the electrode–electrolyte interface stability. Consequently, Li–S cell with this modified separator delivers 894 mAh g–1 at 5.2 mg cm–2 sulfur loading and 0.2 C, and maintains stable cycling over 1908 cycles at 2.2 mg cm–2 and 0.5C with a low capacity decay of ≈0.041% per cycle and Coulombic efficiency approaching 100%. This work presents a trimetallic-catalyst-based separator engineering strategy for high-performance, long-life Li–S batteries.
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Temitope F. Ajibade,Jiaoxing Xu,Huali Tian,Lunhui Guan,Kaisong Zhang
Removal of emulsified oil droplets less than 20 μm and maintaining operational stability remains a key concern in the field of oily wastewater treatment. In this work, a major breakthrough was achieved via modification of polyacrylonitrile/polyvinylidene fluoride (PAN/PVDF) blended ultra-filtration (UF) membrane with oxidized multiwall carbon nanotubes (O-MWCNT) to tailor the membrane chemical properties for boosted oil and water separation. Overall, a high separation performance of oily emulsion (99%) and simultaneous increase in flux up to 65% was achieved using the novel O-MWCNT/PAN/PVDF membrane. Moreover, the performance of the O-MWCNT/PAN/PVDF membrane was consistent after 28-cycles of oil separation and the antifouling properties were exceptionally enhanced by 96%. In addition, there was a significant decrease in fouling in terms of the cake, pore, and intrinsic resistance. Furthermore, evidence of even dispersal of nanofillers was confirmed by an increase of casting solution viscosity with increasing O-MWCNT. Consequently, this provides a remarkable mechanical/tensile strength of 5.94 MPa, and 16.05% elongation of the O-MWCNT/PAN/PVDF fingerlike structured UF membrane. The novel O-MWCNT/PAN/PVDF membrane demonstrated promising properties that balanced the membrane tradeoff between permeability and selectivity, as well as, improved mechanical strength and operational stability that can elongate the life span of the membrane in oily wastewater treatment.
研究领域:
膜技术
·
水处理
·
纳米材料
·
分离科学
·
环境工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Rui Teng,Aojia Zhang,Kun Zhang,Yang Li,Xue Liu,Wenye Sun,Chengcheng Suo,Sha Luo,Chunhui Ma,Mingcong Xu,Shouxin Liu,Wei Li
With the rapid advancement of 5G communications and flexible electronics, electromagnetic interference (EMI) shielding materials with multifunctionality and environmental adaptability are urgently needed. Herein, we report a sustainable and cost-effective strategy to fabricate multifunctional multilayer films incorporating kapok cellulose nanofibers, MWCNT, and Fe 3 O 4 nanoparticles. Specifically, films with 3–11 layers are obtained via sequential solution deposition and vacuum filtration. The multilayer architecture enhances interfacial polarization and multiple internal reflection, yielding an EMI shielding effectiveness of 46 dB for samples with 11 layers. Meanwhile, the synergistic combination of polymeric, conductive, and magnetic components endows the film with inherent flexibility, thermal stability, and additional functionalities, including photothermal conversion (reaching up to 108 °C under 2.0 sun illumination) and a Seebeck coefficient of 56.3 μV/K. This work provides an effective approach for integrating EMI shielding with energy-related functionalities in sustainable bio-based films, offering novel insights into the design of high-performance multifunctional EMI shielding materials.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 13
·978
·
IF 3.2
Li Xiongbin,Zhou Yuqiao,Tang Xiu-Zhi,Zhang Hong,Li Hengfeng
The aerospace, military stealth, and 5G communication fields have raised new requirements for multifunctional materials. In this study, a rigid MWCNT/Co@C/rGO/PMI composite foam (MCGP) was prepared using a UV light-initiated in-situ copolymerization hot air foaming method. The sandwich structure of MOF-GO-MOF, after calcination, achieved a uniform dispersion of magnetic Co particles and formed rich hetero interfaces. The 0D Co@C, 1D MWCNT, and 2D rGO formed a multi-dimensional filler system, and the magnetic-electrical synergy and isotropy bubble structure jointly optimized the impedance matching, and multiple loss mechanisms enhanced the absorbing performance. The results showed that M20C20/PMI achieved a RL value of -68.26 dB at a frequency of 8.92 GHz and a thickness of 40mm, and the EAB covered the full frequency band of 2—18 GHz. The RCS value of M25C15/PMI reached a minimum of -45.82 dB·m 2 . Notably, by carefully adjusting the proportion of fillers, the five MCGP composite foams prepared in this study all had a minimum RL value of < -55 dB, basically meeting the requirements of each absorption frequency band. In addition, the MCGP composite foams are lightweight (28.30 kg/m 3 ), have high strength (0.50 MPa), heat insulation (0.02856 W/(m·K)), and infrared stealth characteristics, making them promising as a new generation of integrated structural–functional protective materials.
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2026
·
IF 2.8
Dai Han Yan,Xu Jing Wen,Zeng Han
In this work, we made a ternary composite made up of polydopamine-modified carbon nanotubes and Au nanoparticles that acts as a unit to hold a redox protein. The components within the ternary complex serve as a cofactor orientation guide, a conductive element, and an electron shuttle promoter, respectively. The electrochemical reactions occurring at this electrode were dominated by the redox process of the active cofactors in hemoglobin in coordination with polydopamine, achieving favorable efficiency with charge transfer of 69.8 s −1 . The hemoglobin-based electrode displayed an efficient electrocatalytic effect toward H 2 O 2 reduction with an onset potential of 0.058 V, close to the formal potential value for heme sites on hemoglobin. The normalized turnover frequency of the substrate in hemoglobin-induced electrocatalysis was estimated to be 7.0 × 10 2 s −1 . The as-prepared hemoglobin-based electrode exhibited favorable affinity, appropriate sensitivity, and a moderate detection limit toward the substrate ( K M = 0.214 mM, 1.01 × 10 −3 A·L·mol −1 , and 5.0 × 10 −3 mmol·L −1 ). The substrate diffusion process was identified as the key factor limiting the electrocatalytic performance of the hemoglobin-based electrode (2.23 × 10 −2 s −1 ). A glucose–H 2 O 2 biofuel cell was fabricated and could operate at an open-circuit potential of 0.72 V. Such a cell could produce a desirable power output density of ~5500 μW·cm −2 in the presence of a proton exchange membrane. Graphical Competitive ligation of heme protein with polydopamine could play a protective role against the negative effect of direct contact of the enzyme molecule with Au nanoparticles to retain the original configuration of native hemoglobin and exert its underlying electrocatalytic activity.
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DOI
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Canyang Zhang,Guangtong Hai,Chao Chen,Yin Liang,Wei Zhao,Bolong Li,Jianghao Wang,Zhenyu Zhang,Huiping Ji,Kaige Wang,Reinout Meijboom,Jie Fu
The decarbonylation of biomass-derived fatty acids offers a green and sustainable route to high-value long-chain alkenes. Nitrogen-doped carbon-supported cobalt (Co-NC) catalysts have emerged as promising candidates for fatty acid decarbonylation, attributed to their exceptional catalytic activity and cost-effectiveness. However, identifying the active sites and elucidating the reaction mechanism remain significant challenges. To address these issues, we developed Co single-atom-rich catalysts (CoPc/MWCNT and pyrolyzed derivatives CoPc/MWCNT-X) via the impregnation of cobalt phthalocyanine onto multiwalled carbon nanotubes (MWCNTs), followed by pyrolysis. These catalysts exhibited a high stearic acid decarbonylation activity, increasing the heptadecene yield from 12.9 to 47.4%, with an alkene-to-alkane ratio of up to 4.3. Comprehensive characterization and control experiments conclusively demonstrated that Co single-atom sites serve as the active sites, while coexisting Co/CoO nanoparticles showed negligible activity and no synergistic effects. In situ DRIFTS revealed carbonyl group adsorption on Co single atoms, with DFT calculations confirming directional alkene production via C–O bond cleavage. This work establishes a facile synthetic strategy for high-performance decarbonylation catalysts and unambiguously identifies the critical single-atom active sites while enabling a profound understanding of fatty acid conversion mechanisms.
研究领域:
催化
·
绿色化学
·
材料科学
·
化学反应工程
·
表面化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhikun Wang,Zhuo Chen,Ayesha Yousaf,Lan Wu,Guixin Jin,Zhigang Shao,Zhihua Zhao
Herein, a resistive gas sensor based on Molybdenum tri oxide (MoO 3 )/ 9 % mass fraction of multi-walled carbon nanotubes (MWCNTs-9) nanocomposites was developed by hydrothermal method to detect NH 3 gas at room temperature. According to the findings, outstanding resistance change rate of 187.5 % was observed in MoO 3 /MWCNT-9 sensor when exposed to 100 ppm NH 3 at room temperature (25 °C). In contrast, 8.2 % response rate was recorded for pure MoO 3 sensor when exposed to same condition and the response value of newly fabricated sensor was improved by about 22.9 times to unalloyed MoO 3 . In addition, the nanocomposite sensor consisting of MoO 3 /MWCNT-9 had demonstrated excellent selectivity, repeatability, and a high level of sensitivity in detecting low concentrations of NH 3 at low temperature. During experiment when the sensor desorbed NH 3 gas at room temperature, a certain instantaneous voltage was applied, which greatly reduces the sensor’s resistance recovery time to 90 s. MWCNTs’s doping decreased the operating temperature of MoO 3 and showed good gas sensitivity at room temperature. Finally, the results reveal that MoO 3 /MWCNT-9 nanocomposite-based sensor can be fruitful in the field of NH 3 monitoring.
研究领域:
材料科学
·
传感器技术
·
纳米科技
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产品关联
DOI
高影响因子
SENSORS
·
2026
·Vol. 26
·期 3
·976
·
IF 4
Anran Ma,Tao Wang,Zhilin Zhao,Yi Liu,Maoping Xu,Shengxiang Gao,Rui Zhu,Jiamin Wu,Chuang Hou,Guoan Tai
Humidity sensing is essential in medical fields such as respiratory support, neonatal care, sterilization, and pharmaceutical storage. However, current sensors face limitations, including slow response/recovery, low sensitivity, and poor long-term stability. To address these challenges, we developed borophene-multiwalled carbon nanotube (MWCNT) heterostructures using a stepwise in situ thermal decomposition method. The resulting humidity sensor exhibits an ultrabroad detection range (11–97% RH), ultra-high sensitivity (55,000% at 97% RH), and fast response/recovery times (10.04 s/4.8 s). Through interfacial charge-transfer engineering, the system facilitates rapid electron migration, enhances Schottky barrier modulation, and provides abundant active adsorption sites for water molecules, thereby achieving comprehensive improvement in sensing performance. It also demonstrates excellent selectivity, mechanical flexibility, and operational stability. Notably, the sensor’s sensitivity at 97% RH surpasses that of sensors based on pure borophene or MWCNT by 37–462 times, highlighting the advantages of heterostructure engineering. The multifunctionality of the device suggests its potential in areas beyond conventional sensing, including non-contact voice recognition, skin humidity mapping, and real-time breath monitoring. These results lay a solid foundation for developing borophene-MWCNT heterostructures into a high-performance platform for next-generation medical diagnostics and intelligent health monitoring.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhixiang Xie,Huaiyu Chen,Mingyu Xie,Duoduo Zhang,Hongchao Zhao,Wenduo Chen
Polymer-based electromagnetic interference (EMI) shielding effectiveness (SE) composite materials play a crucial role in electronics, telecommunications, healthcare, and military fields. However, the electrical percolation networks and the interface structures between polymer chains and conductive fillers still cannot be directly obtained by experimental observation, which plays a decisive role in EMI SE . In this work, multi-walled carbon nanotubes (MWCNT) / graphene (Gr) / polyaniline (PANI) films with electrical percolation network structures were prepared by electrochemical deposition, and the forming process of percolated networks and the interface structures can be directly observed by all atom molecular dynamics simulations. Compared with the MWCNT/Gr film, the EMI shielding effectiveness (SE) of the ternary film deposited with PANI rises by 35.6 %, and the conductivity increases by 126 %. The EMI SE of the film reaches 78 dB at 10 GHz when the thickness is about 292 μm . The improvement of EMI SE is attributed from the reduction of flaws and voids of film, the formation of electrical percolation network as well as an increase in lamellar spacing of Gr nanosheets with PANI deposition.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 23
·13517-13524
·
IF 3.119
Chunbo Wang,Bing Cong,Junyu Zhao,Xiaogang Zhao,Daming Wang,Hongwei Zhou,Chunhai Chen
Herein, MWCNT-graft-polyimides (MWCNT-g-PIs) were prepared by the in situ grafting method. Strengthening the interfacial interaction between MWCNTs and polyimide chains decreased their interfacial thermal resistance (RC). In contrast to the RC of 10% MWCNT/PIs, the RC of 10% MWCNT-g-PI decreased by 16.7%. Hence, MWCNT-g-PIs possessed higher thermal conductivity than MWCNT/polyimides (MWCNT/PIs). Meanwhile, the Tg values of all the samples (MWCNT/PIs and MWCNT-g-PIs) were greater than 399 °C (by DMA). Compared with MWCNT/PIs, 5% and 10% MWCNT-g-PIs showed enhancement in thermal stability in air. The storage modulus retentions were greater than 63% at 200 °C and 45% at 300 °C. Also, 5% and 10% MWCNT-g-PIs maintained the high tensile strength of pure PI, and the tensile modulus increased up to 2.59 GPa on increasing the loading amount of MWCNTs. This study sheds light on improving the thermal conductivity of polyimides effectively at relatively low loadings.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Kunpeng Qian,Hongmin Wu,Jianhui Fang,Yuhuan Yang,Miao Miao,Shaomei Cao,Liyi Shi,Xin Feng
Ti 3 C 2 T x MXenes with excellent metallic conductivity have proved promising in its application of electromagnetic interference (EMI) shielding. A hierarchical hybrid film with ultrathin thickness composed of Ti 3 C 2 T x MXene layers embedded with yarn-ball-shaped microspheres of cellulose nanofibrils (CNF) and multiwalled carbon nanotube (MWCNT) was designed to improve the absorption of electromagnetic waves (EMWs). The addition of yarn-ball-shaped microspheres is to shield more EMWs via multiple reflections in the inner space and reduce the undesirable emissions into the air. After thermal annealing treatment, the ultrathin film with intercalation of the carbonized yarn-ball-shaped CNF/MWCNT microspheres exhibited enhanced EMWs absorption as an important part of shielding effectiveness (45.1±0.9 dB) as well as excellent mechanical stability (≈0.9 million bending times). Thus, the well-designed structure of multilayered hybrid films with intercalated conductive microspheres can be a good candidate for higher absorption in EMI shielding effectiveness and outstanding mechanical properties.
研究领域:
材料科学
·
电子工程
✓ 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）