ACS Applied Polymer Materials
·
2023
·
IF 5
Aowei Lv,Xue Lv,Song Tian,Ting Xie,Xiaoyan Xu,Shulin Sun
Conductive hydrogels, as a flexible electronic material, have found emerging applications in the fields of wearable devices, health monitoring, and electronic skin. However, the current conductive hydrogels lack antimicrobial properties and excellent mechanical properties, which severely limit their applications in wearable and biological interfaces. Herein, a conductive nanocomposite hydrogel consisting of silver nanowires (AgNWs), carboxylated carbon nanotubes (c-MWCNTs), chitosan (CS), and polyacrylamide (pAAm) was prepared by in situ free-radical polymerization without adding any cross-linking agents. Ingeniously, physical interactions (hydrogen bonding) endow the hydrogels with excellent tensile strength (503.64 kPa), ultrahigh tensile (16,000%), high toughness (22.8 MJ·m–3), and self-healing properties. Remarkably, hydrogels based on AgNWs and CS exhibit excellent antibacterial activity against Staphylococcus aureus, Escherichia coli, and Bacillus subtilis. Simultaneously, under the synergistic effect of AgNWs and c-MWCNTs, the fabricated conductive hydrogel sensor exhibits excellent strain sensitivity (gauge factor = 10.42, up to 900%), high conductivity, and fast response time (200 ms). The c-MWCNTs-AgNWs-based hydrogel sensors can sensitively and stably detect human activities, which show that pAAm/c-MWCNTs@CS-AgNWs hydrogels have great potential in the fields of human activity monitoring, e-skin, and soft electronic devices.
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高影响因子
ELECTROANALYSIS
·
2022
·Vol. 34
·期 10
·1555-1563
·
IF 3.077
Ruirui Dong,Yanhui Zhang,Jiali Huang,Marhaba Habibul,Guixin Li
A novel electrochemiluminescence biosensor was presented for the assay of hepatitis B virus (HBV) DNA. Coralloid poly(aniline-luminol)-MWCNTs was prepared on an electrode surface, which was followed by the attachment of capture DNA via amide bond formation. The HBV-DNA and ferrocene labelled DNA hybridized with capture DNA to form a sandwich structure on electrode surface. Ferrocene can effectively increase the signal output of the ECL sensor due to the catalysis of ferrocene on electrochemiluminescence of luminol. The biosensor rendered a linear dependence over the range from 1.0×10 −16 to 1.0×10 −7 M with a low detection limit of 2.4×10 −17 M.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Weijie Wei,Jingjing He,Lan He,Xinyu Qi,Xiaqing Zhang,Wubo Wan,Zhuwei Gao
The use of solar desalination is expected to solve the problem of water scarcity. Based on this, MWCNTs were loaded on filter paper and assembled into a MWCNTs disc evaporator using cotton threads as water channels in this paper. MCED with different loadings were prepared, and the photothermal conversion performance of MCED was evaluated through experiments. The results showed that the evaporation rate of 0.7-MCED at one solar intensity could reach 1.3134 kg/m 2 h; the efficiency of solar separation of vapor and salt was 77.63 %. Meanwhile, after a 7-day evaporation cycle of 0.3-MCED, salt crystallizes at the edge of MCED under light and is recovered by gravity shedding during darkness, and the freshwater collection rate and salt recovery rate are 0.82 kg m −2 h −1 and 38.24 g m −2 h −1 , realizing efficient and continuous water collection and salt recovery. In addition, MCED can generate voltage through water evaporation. This work demonstrates a solar evaporator that can be used for continuous seawater desalination as well as salt recovery and power generation, and provides a new direction for the design of photothermal modulation of MWCNTs and solving the salt crystallization problem for solar desalination.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ling Jia,Yue Mao,Siqi Zhang,Hong Li,Ming Qian,Dongbo Liu,Bin Qi
An electrochemical switch sensor toward ephedrine hydrochloride (EPh) determination was developed based on complex reactions and molecular imprinting (MIP) technique. The MIP was formed on a glassy carbon electrode (GCE) modified with Nafion-multi-walled carbon nanotube (Nafion-MWCNTs/GCE). The analytical performances of this sensor were evaluated using several electrochemical methods by measuring the response of EPh elution and re-adsorption in MIP. The working concentration range of this sensor was 1.8 × 10 −7 mol/L ~ 7.5 × 10 −5 mol/L with a detection limit of 7.2 × 10 −8 mol/L (S/N = 3). The sensor also displayed a fast response time of less than 180 s and good anti-interference ability towards several co-existing substances. The determination of EPh in spiked Saliva samples also receives satisfying results which suggest potential applications of the present sensor.
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高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Rui Wang,Congzhen Xie,Shoukang Luo,Huasong Xu,Bin Gou,Leilei Zeng
Carbon nanotubes are widely used to enhance polymer thermal management due to their excellent thermal conductivity. However, in the field of insulating materials, the high electrical conductivity of carbon nanotubes greatly limits their filling content. At present, realizing carbon-based polymer with high thermal conductivity but electrical insulation is a problem. In this work, the surface of carbon nanotubes was acidified and grafted with diethylenetriamine (DETA). In addition, carbon nanotubes and boron nitride nanosheets (BNNSs) were co-filled in epoxy resin to construct a three-dimensional thermal conductivity network. The results showed that the electrical conductivity of the DETA grafted carbon nanotubes/epoxy composite decreased significantly, the dielectric constant decreased from 9.73 to 4.3, and the dielectric loss decreased from 0.38 to 0.015. When BNNS and MWCNT formed a thermal conductivity network inside the epoxy resin, the nanocomposite exhibit thermal conductivity enhancement of about 819 %, which realized the enhancement of thermal conductivity of nanocomposites at very low filling content. This strategy provides a new idea for the preparation of carbon-based insulating composites, which is expected to meet the demand of the modern electronic industry.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Haoye Wang,Yun Yang,Yihan Ren,Duangui Chen,Jianhong Wei,Lu Wang,Aijuan Xie,Shiping Luo
Zirconia supported on multi-walled carbon nanotubes (ZrO 2 /MWCNTs) as carriers was synthesized with hydrothermal method, and then ternary Pt-ZrO 2 /MWCNTs hybrid was prepared by electrodeposition with aims to enhance electron and proton conductivity, specific surface as well as active site, and also oxidize the adsorbed CO on Pt surface and synergistically improve electrocatalytic activity and stability for the oxidation of methanol. The synthetic conditions of Pt-ZrO 2 /MWCNTs, such as mass ratio of ZrO 2 /MWCNTs, deposition cycle of Pt, were screened, respectively. The catalytic performance of Pt-ZrO 2 /MWCNTs hybrid for methanol oxidation was investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperogram test. The results showed that Pt-ZrO 2 /MWCNTs hybrid exhibited significantly lower charge transfer resistance and better toxicity resistance compared with the commercial Pt/C(20 wt%)-SA. Meanwhile, the ECSA (42.25 m 2 /g) of Pt-ZrO 2 /MWCNTs hybrid is higher than that of other related materials. Therefore, the as-prepared Pt-ZrO 2 /MWCNTs hybrid is a promising electro-catalyst for the application of direct methanol fuel cell.
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高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Feifei Wang,Youhong Tan,Haiyi Peng,Fancheng Meng,Xiaogang Yao
In this paper, a flexible capacitive pressure sensor with porous barium titanate (BaTiO 3 )/multi-walled carbon nanotubes (MwCNTs)/polydimethylsiloxane (PDMS) composite layer as the dielectric layer was fabricated. The sensitivity, stability, response time and human compatibility of the sensor were fully studied. The results showed that a controllable porous microstructure dielectric layer was built successfully where hybrid BaTiO 3 and MwCNTs fillers with giant permittivity distributed homogeneously. The BaTiO 3 /MwCNTs/PDMS flexible capacitive pressure sensor possessed high sensitivity (~1.24 kPa −1 ) and good stability in the low pressure range (0 ~ 0.8 kPa). Moreover, a low detection limit (~7 Pa) and a fast response time (~200 ms) were obtained. Human compatibility test revealed that our flexible sensor could catch the response of human body swiftly so that it exhibited a bright application prospect in wearable electronics.
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高影响因子
Nanoscale
·
2019
·Vol. 11
·期 15
·7394-7403
·
IF 6.97
Pengcheng Zhao,Meijun Ni,Chao Chen,Zhidu Zhou,Xiping Li,Chunyan Li,Yixi Xie,Junjie Fei
A temperature-controlled switchable electrochemical sensor was constructed based on a composite film consisting of thermosensitive block polymer poly(styrene-b-(N-isopropylacrylamide)-b-styrene) (PS-PNIPAm-PS), carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) and amino-functionalized graphene quantum dots (N-GQDs). The prepared sensor showed good temperature sensitivity and reversibility in sensing paracetamol. In the low temperature environment, the polymer stretched to bury the electroactive sites of the carbon nanocomposite, and the paracetamol could not pass through the polymer to achieve electronic exchange, representing the “closed” state. Conversely, in the high temperature environment, the polymer shrank to expose the electroactive sites and enlarge background currents, the paracetamol was able to undergo the redox reaction normally and generate the response current, representing the “on” state. In addition, the sensor had a wide detection range (0.1 to 7.0 μM and 7.0 to 103.0 μM) and a low LOD of 66 nM for paracetamol. This switch-like sensor provided a novel idea for the application of thermosensitive polymers.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 8
·3212-3227
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IF 3.442
Song Shixin,Xia Shan,Wei Yingcong,Lv Xue,Sun Shulin,Li Quanming
In this paper, the fluoro-polymer-coated multiwall carbon nanotubes (MWCNTs) were prepared by in situ atom transfer radical polymerization of 2-(perfluoroalkyl) ethyl methacrylate (FEMA) on the surface of MWCNTs. Scanning electron microscopy results showed that the fluoro-polymer on MWCNTs surface improved the dispersion and compatibility of MWCNTs in the poly(vinylidene fluoride) (PVDF) matrix. The PFEMA@MWCNTs/PVDF composites exhibited improved thermal stability and reduced crystallinity due to enhanced interface strength between MWCNTs and PVDF. Furthermore, nearly 100% polar phase PVDF formed after introducing high PFEMA@MWCNTs content into PVDF matrix. It was also found that PFEMA@MWCNTs-filled PVDF composites present advantages in increasing dielectric constants and decreasing loss tangents due to the restriction of interface polarization and leakage current. Based on the percolation threshold and ac conductivities, the PFEMA@MWCNTs/PVDF composites exhibit good insulation properties and are promising for high-performance dielectric composite applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 15
·13112-13117
·
IF 2.324
Xu Pei,Ruan Gang,Cui Zhaopei,Ding Yunsheng
Polyvinylidene fluoride (PVDF) based nanocomposites with γ-oxo-pyrenebutyric acid-noncovalent modified multiwalled carbon nanotubes (denoted as PACNTs) and stearic acid-covalent modified MWCNTs (SACNTs) as nanofillers, were fabricated using solution-blending method and their dielectric properties were carefully investigated. γ-Oxo-pyrenebutyric acid (PA) or stearic acid (SA) can improve the dispersion of MWCNTs in PVDF matrix because of strong physical π–π interaction and the surface of MWCNTs grafted with SA respectively. The values of percolation threshold for PVDF/PACNTs and PVDF/SACNTs were determined to be 5.7 and 6.3 vol%, respectively. Higher dielectric permittivity and lower loss tangent of PVDF/PACNTs originates from remarkable interfacial polarization because PA have more contact area with MWCNTs and can reduce leakage current compared with SA.
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高影响因子
JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Kezhong Wu,Jiajing Zhao,Yuanyuan Xiong,Bei Ruan,Mingxing Wu
Pt-free counter electrode (CE) composed of La 2 MoO 6 (La 2 O 3 -MoO 3 ) was successfully synthesized by simple pyrolysis of lanthanum acetate (C 6 H 9 O 6 La· x H 2 O) and hexaammonium heptamolybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O). Furthermore, three proportions composites catalysts of La 2 MoO 6 @MWCNTs based on La 2 MoO 6 and multiwall carbon nanotubes (MWCNTs) were prepared and characterized as Pt-free catalyst for CE in dye-sensitized solar cells (DSSCs). The morphology and structure of La 2 MoO 6 @MWCNTs composites were determined by scanning electron microscopy, transmission electron microscope and X-ray diffraction. The electrochemical performance of La 2 MoO 6 @MWCNTs composite catalysts for CEs was determined by photocurrent-voltage measurements, cyclic voltammetry , electrochemical impedance spectroscopy , and Tafel polarization. The power conversion efficiencies of 4.68%, 4.87% and 5.06% are obtained for La 2 MoO 6 :MWCNTs with the mass ratios of 5:1, 3:1 and 1:1 towards the reduction of I 3 – to I – under the same conditions, respectively, which are superior to those of MWCNTs (3.94%) and La 2 MoO 6 (1.71%) electrodes. The experimental results reveal that the presence of MWCNTs results in an augmented active catalytic surface area and enhanced charge transfer from CE to the electrolyte.
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高影响因子
NANO
·
2015
·
IF 1.09
Wen-Ting Li,Yu Wang,Fen-Fang Deng,Li-Li Liu,Hai-Jun Nan,He Li
A novel electrochemical immunosensor for determination of carcinoembryonic antigen (CEA) in human serum was fabricated by depositing Mo–Mn 3 O 4 /MWCNTs/Chits nanocomposite onto an indium-tin oxide (ITO) electrode. Mo-doped Mn 3 O 4 (MMO) was synthesized by sol–gel method and the presence of molybdenum improved its electrochemical properties. The MMO/MWCNTs/Chits nanocomposite could accelerate the electron transfer rate and enlarge the surface area to capture a large number of Carcinoembryonic Antigen (CEA). The factors influencing the performance of the immunosensor were investigated, such as incubation time, incubation temperature and pH. Under optimal conditions, the electrochemical immunosensor could detect CEA in a linear range from 0.1 ng ⋅ mL − 1 to 125 ng ⋅ mL − 1 with a detection limit of 4.9 pg ⋅ mL − 1 ( S ∕ N = 3 ). In addition, it exhibited high sensitivity and acceptable stability on a promising immobilization platform for signal amplification, which could be extended to other labeled recognition systems. This electrochemical immunosensor may provide potential applications for the clinical diagnosis.
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高影响因子
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