INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jin Fang,Zhiwei Zhao,Zhenzhen Xu,Qingqing Ni
Moisture electricity generator (MEG) is a green and environmental-friendly energy harvesting technology, and the ubiquitous presence of moisture makes it a strong competitor for mobile power. Among the available structural forms, fibrous MEG with engineered tunability and high integrality are perhaps one of the most promising solutions. However, the continuous preparation of fibrous MEG limits their scale-up production and commercial application. Herein, we utilized sodium alginate (SA) and multi-walled carbon nanotubes (MWCNTs) in combination with microfluidic sequential wet spinning to continuously fabricate axial heterogeneous structure fiber, where the gradient of oxygen-containing functional groups is critical for electricity generation. A single unit (1 cm) can produce an open-circuit voltage (V oc ) of 0.26 V, a short-circuit current (I sc ) of 2.59 μA, and a power density of 0.80 μW/cm 2 under moisture stimulation. The energy output can be easily increased by a simple series/parallel connection. Benefiting from the axial heterogeneous structure, the fibrous MEG can continuously output 0.2–0.25 V for more than 168 h. Furthermore, we extended the functionality and practicality of the fibrous MEG by incorporating materials with pH-responsive functions, which enables visual monitoring of acid/alkali gases. Overall, this work creates a new strategy for the structural design and large-scale continuous production of multifunctional fiber-based electronics.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mingyue Wang,Hao Guo,Rui Xue,Qixia Guan,Junye Zhang,Tingting Zhang,Lei Sun,Fan Yang,Wu Yang
Covalent organic frameworks (COFs) offer high surface area, ordered π conjugation system, tunable pore size and structure which are useful for developing electrochemical sensor. However, most COFs were poor conductivity and slow charge transfer rate which restrict their application in electrochemical sensor. Metal-covalent organic frameworks (MCOFs) possess the good electroconductivity and catalytic activity. In addition, the periodic arrays of π clouds of layered 2D structure facilitate charge transport. Here we propose a new strategy to construct a novel electrochemical sensor employing MCOFs (CuP-SQ COF). The fabricated sensor MWCNTs-COOH/CuP-SQ COF/Co NPs/GCE exhibits the excellent performance for the simultaneous determination of DNA base (guanine and adenine) with high sensitivity which can be attributed to the outstanding properties, unique structure and synergistic effect of composites. The wider concentration range of simultaneous quantitive analysis were 0.04 to 130 μM for guanine and 0.06 to 130 μM for adenine . The lower detection limits were 5.5 nM and 7.2 nM (S/N = 3), respectively. This work proves MCOFs can serve as a promising candidate as modified electrode material for developing electrochemical sensor.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 11
·2615-2631
·
IF 2.578
Dina F. Katowah,Gharam I. Mohammed,Dyab A. Al-Eryani,Osman I. Osman,Tariq R. Sobahi,Mahmoud A. Hussein
The nanocomposites (NCs) of cross-linked polyaniline (CPA) with a variety of carbon nanomaterials (CNMs) (CPA/CNMs NCs) was prepared by the chemical oxidative copolymerization of PANI and p-phenylenediamine (PPDA) with triphenylamine (TPA) in the presence of CNMs. The results of XRD, FTIR and Raman indicated that the CPA/CNMs NCs were effectively synthesized with strong interactions among the constituents. The morphology study demonstrated that CNMs were well coated by CPA and produce a well-aligned nanorod core-shell structure with the large surface area which may be more beneficial to electrical conductivity when used as electrode materials. Differential thermal analysis techniques (TGA-DTG) were used to characterize the thermal stability of NCs. The heat of formation of CPA monomer from TPA, PPDA and aniline (ANI) were computed using Density Functional Theory (DFT) calculations. The NCs of G-MWCNTs demonstrate higher affinity to oxidation of Chlorophenols (CPHs) than glassy carbon electrode (GCE), CPA/GCE and the other NCs. Differential pulse voltammetry (DPV) was used for the trace determination of 2,4-dichlorophenol (2,4-DCP). Under the optimum conditions, the peak current of 2,4-DCP was proportional to its concentration in the range of 0.05-0.6 μmol/L. The detection limit was 7.6 nmol/L. The method was successfully applied for the determination of 2,4-DCP in fish farm water with satisfactory recoveries. The suggested method has an advantage to be used for water samples due to its short analytical time, rapid response, high sensitivity, and excellent selectivity with good reproducibility.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Fuge Chai,Jing Wang,Siyi Sun,Yongping Dong,Mingfu Ye
Cathodic ECL of TiO 2 was greatly enhanced by carboxylated MWCNTs. • TiVC MXene QDs were loaded onto MOF to form stable nanocomposite. • TiVC/MOF nanocomposite exhibited inhibiting effect on the cathodic ECL of TiO 2 . • An ECL sensor for chloramphenicol was fabricated based on its inhibiting effect. In this study, TiO 2 nanoparticles were employed as novel luminophore to obtain cathodic electrochemiluminescence (ECL) signal in the presence of K 2 S 2 O 8 under neutral aqueous condition. Carboxylated multi-walled carbon nanotubes (f-MWCNTs) served as co-reactant accelerators to facilitate the reduction of K 2 S 2 O 8 , resulting in greatly enhanced cathodic ECL signal. TiVC MXene quantum dots (TiVC QDs) were loaded onto MOF to form stable nanocomposite (TiVC/MOF) which could effectively suppress the cathodic ECL emission by blocking interfacial electron transfer and consuming SO 4 •− via chemical reaction. Based on the inhibiting effect of TiVC/MOF nanocomposite, an “off-on” mode ECL sensor was fabricated for the sensitive detection of chloramphenicol (CAP). Under the optimal condition, the proposed sensor exhibited a linear range of 0.1 μM-6 μM with a detection limit of 3.62 nM. Moreover, the ECL sensor showed satisfactory analytical performance in real samples, offering a reliable strategy for the sensitive detection of CAP. Carboxylated multi-walled carbon nanotubes (f-MWCNTs) could act as co-reactant accelerators to greatly enhance the cathodic ECL of TiO 2 nanoparticles. TiVC MXene QDs were loaded onto MOF to form stable nanocomposite (TiVC/MOF) which could effectively suppress the cathodic ECL emission. Based on the inhibiting effect of TiVC/MOF nanocomposite, an “off-on” mode ECL sensor was fabricated for the sensitive detection of chloramphenicol (CAP). The ECL sensor showed satisfactory analytical performance in real samples, offering a reliable strategy for the sensitive detection of CAP. Download: Download high-res image (178KB) Download: Download full-size image
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ACS Applied Electronic Materials
·
2026
·Vol. 8
·期 17
·7290-7300
·
IF 4.7
Liu Xuyan,Gao Yitong,Yang Can,Bao Wenqing,Xia Yijie,Li Qiang
Flexible piezoresistive sensors hold promising application prospects in wearable health monitoring and human−machine interaction. However, existing devices struggle to achieve a favorable balance among high sensitivity, wide detection range, long cycle life, and low cost simultaneously. In this work, an N/A/CB/MWCNTs/MXene (PCMM) flexible piezoresistive sensor with a ternary conductive network was proposed based on a polyimide (N/A) sponge. The low-cost and high-resilience N/A sponge substrate was prepared via an isocyanate-assisted one-step in situ natural foaming method. A 0D−1D−2D hybrid three-dimensional conductive network was constructed on the substrate using carbon black (CB), multiwalled carbon nanotubes (MWCNTs), and two-dimensional MXene through a vacuum dip-coating process. At a MXene dosage of 30 mg, the composite material achieves a high electrical conductivity of 1.8 × 10 −2 S/m with a residual strain of only 6.02%, demonstrating outstanding mechanical resilience. The as-prepared sensor delivers a high sensitivity of 4.393 kPa −1 within the pressure detection range of 0−5 kPa, shows a response time of less than 190 ms, and maintains stable electrical output over 3000 compression cycles. Compared with previously reported N/A-based flexible sensors, this work presents distinct advantages in the structural design of conductive networks and the synergistic optimization of sensitivity and durability. The fabricated sensor has been successfully applied to human motion monitoring, physiological signal detection, and voice recognition, showing great application potential in intelligent health monitoring and next-generation wearable electronics.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Wei Zhong,Jin Zou,Yanyu Xie,Jing Yang,Mingfang Li,Shuwu Liu,Yansha Gao,Xiaoqiang Wang,Limin Lu
Herein, a highly sensitive and selective electrochemical sensor for the detection of benomyl (BN), a typical benzimidazole fungicide was proposed based on hierarchical nano-Cu x O decorated MWCNTs-COOH/MXene (nano-Cu x O-MWCNTs-COOH /MXene) composite. The ternary heterostructure presents good electrical conductivity, large specific surface area, and high catalytic activity, exhibiting excellent electrocatalytic activity with enhanced electrochemical signals towards the oxidation of BN. Besides, the embedded nano-Cu x O particles possess strong affinity toward benzimidazole molecules, which could promote the preconcentration of BN, further enhancing the sensitivity, as well as ensuring the high selectivity. Benefitting from the synergistic effect of components in the composite, the developed sensor presents a broad linear range from 10.0 nM to 10.0 μM with a low limit of detection of 3.0 nM (S/N = 3). Meanwhile, the nano-Cu x O-MWCNTs-COOH/MXene electrode also displays good long-term stability and repeatability. Furthermore, this method was successfully applied for the detection of BN in apple samples, illustrating its promising practicability.
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Journal of Environmental Sciences
·
2020
·
IF 4.302
Zhiguo Zhao,Moyan Zhou,Nan Li,Yuyuan Yao,Wenxing Chen,Wangyang Lu
Metal phthalocyanine has been extensively studied as a catalyst for degradation of carbamazepine (CBZ). However, metal phthalocyanine tends to undergo their own dimerization or polymerization, thereby reducing their activity points and affecting their catalytic properties. In this study, a catalytic system consisting of O-bridged iron perfluorophthalocyanine dimers (FePcF 16 -O-FePcF 16 ), multi-walled carbon nanotubes (MWCNTs) and H 2 O 2 was proposed. The results showed MWCNTs loaded with FePcF 16 -O-FePcF 16 can achieve excellent degradation of CBZ with smaller dosages of FePcF 16 -O-FePcF 16 and H 2 O 2 , and milder reaction temperatures. In addition, the results of experiments revealed the reaction mechanism of non-hydroxyl radicals. The highly oxidized high-valent iron-oxo (Fe(IV)=O) species was the main reactive species in the FePcF 16 -O-FePcF 16 /MWCNTs/H 2 O 2 system. It is noteworthy that MWCNTs can improve the dispersion of FePcF 16 -O-FePcF 16 , contributing to the production of highly oxidized Fe(IV)=O. Then, the pathway of CBZ oxidative degradation was speculated, and the study results also provide new ideas for metal phthalocyanine-loaded carbon materials to degrade emerging pollutants.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chengshuai Lu,Wenchao Zhen,Zhiliang Zhang,Jiang Lou,Wenjia Han
Flexible electronic skins (e-skins) that offer high sensitivity, durability, and long-term stability are essential for wearable sensing applications; however, achieving a balance between conductivity, mechanical flexibility, and stability remains a significant challenge. This study, addresses these issues by developing a highly elastic, waterborne polyurethane (WPU) composite incorporating bacterial cellulose (BC) and multi-walled carbon nanotubes (MWCNTs). The abundant hydroxyl groups in BC form strong hydrogen bonds with polyurethane, resulting in a dual cross-linking network that mechanical strength and facilitates MWCNTs dispersion through hydrophilic-hydrophobic synergy, thereby significantly improving electrical conductivity. In addition, BC modulates the crystallinity of the composite, directly affecting both its mechanical properties and electrical performance. Consequently, the WPU-BC composite film exhibited a tensile strength of 43.6 MPa, 700 % elongation at break, and toughness of 122 MJ/m 3 , demonstrating outstanding mechanical properties. Furthermore, the MWCNTs/WPU-BC composite film exhibited high conductivity (24.67 S/cm), rapid response time (152.4 ms), and minimal performance degradation after 2000 stretching cycles. These synergistic properties enable flexible e-skins to consistently capture bioelectrical and biomechanical signals over extended periods, highlighting their potential as multimodal health monitoring systems. This study underscores the effective modulation of composite microstructures via hydrogen bonding and crystallinity control, providing a novel approach for developing durable, sensitive, and biocompatible e-skins. This strategy addresses critical challenges in soft-sensor applications.
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TALANTA
·
2024
·
IF 5.6
Feifan Qi,Mengdie Wu,Simin Liu,Wendi Mu,Chunyan Wu,Xinshui Ren,Chuang Rui,Fangfang Wu,Dong Chang,Hongzhi Pan
Carbohydrate antigen 199 (CA199) is the most sensitive marker reported for pancreatic cancer, and it is a difficult task to develop a highly sensitive assay for CA199. During the experiment, a ratiometric electrochemical immunosensor for quantitative analysis of CA199 was prepared for NiCo@Fc-MWCNTs-LDH as the electrode sensing surface and 3D-rGOF@Ag/Au as the label of Ab 2 . NiCo@Fc-MWCNTs-LDH not only provide the required signal for the immunosensor, but also have a layered structure to obtain a large specific surface area, which can provide more sites for the placement of biological molecules. rGOF has the advantages of large specific surface area and high porosity, which can adsorb Ag electrochemical probe through redox reaction. The modification of gold nanoparticles can not only enhance the electrical conductivity of nano-composites, but also immobilize more biomolecules to improve the sensitivity of electrochemical sensors. With the beefing up of CA199 concentration, the oxidation peak current of Ag increases and the oxidation peak current of Fc-COOH decreases. The ratio (y = I Ag /I Fc-COOH ) of two different signals was linear with the logarithm of CA199 concentration in a certain value range. Under optimal conditions, the immunosensor showed excellent performance in the concentration range of 0.0001 U/mL to 10 U/mL, and the detection limit was 5.55 × 10 −4 U/mL. The strategy could clearly discriminate between matched and mismatched targets, demonstrating high specifificity. This approach further detects CA199 in human plasma to differentiate pancreatic cancer patients from healthy individuals with high accuracy. This method also provided a new idea for the ultrasensitive quantitative detection of other biomarkers.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-13
·
IF 5.3
Guo Liang,Zhou Shijin,Xue Jinyan,Liu Zenghui,Xu Shuqing,He Zhangxu,Yang Huaixia
A sandwich electrochemical sensor was fabricated based on multi-walled carbon nanotubes/ordered mesoporous carbon/AuNP (MWCNTs/CMK-3/AuNP) nanocomposites and porous core–shell nanoparticles Au@PdNPs to achieve rapid and sensitive detection of AFB 1 in complex matrices. MWCNTs/CMK-3/AuNP nanocomposite, which was prepared by self-assembly method, served as a substrate material to increase the aptamer loading and improve the conductivity and electrocatalytic activity of the electrode for the first signal amplification. Then, Au@PdNPs, which were synthesized by one-pot aqueous phase method, were applied as nanocarriers loaded with plenty of capture probe antibody (Ab) and signal molecule toluidine blue (Tb) to form the Au@PdNPs-Ab-Tb bioconjugates for secondary signal amplification. The sensing system could still significantly improve the signal output intensity even in the presence of ultra-low concentration target compound due to the dual signal amplification of MWCNTs/CMK-3/AuNP nanocomposites and Au@PdNPs-Ab-Tb. The method exhibited high selectivity, low detection limit (9.13 fg/mL), and strong stability to differentiate AFB 1 from other mycotoxins. Furthermore, the sensor has been successfully applied to the quantitative determination of AFB 1 in corn, malt, and six herbs, which has potential applications in food safety, quality control, and environmental monitoring. Graphical Abstract
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Luheng Wang,Maoyuan Nan,Xisi Long
The coil-shaped element based on α-Fe 2 O 3 doped multi-walled carbon nanotubes (MWCNTs) is fabricated by sputtering and spraying technology for simultaneously measuring the gap and ethanol vapor at room temperature. The experimental results show that with the increase of spraying time, the gas response properties of MWCNTs-based coil-shaped elements change from p-type to n-type, while the gas response properties of the coil-shaped elements based on α-Fe 2 O 3 doped MWCNTs change from n-type to p-type with the increase of mass ratio of α-Fe 2 O 3 to MWCNTs. Particularly, the coil-shaped element with a mass ratio of 100 exhibits the highest gas response value and gap sensitivity in the gap range of 0–0.5 mm, the gas response value of impedance amplitude, impedance angle, and resistance is 0.659 %, 0.265 %, and 6.768 % at the ethanol vapor concentration of 5000 ppm, respectively. The absolute/relative gap sensitivity of impedance amplitude and impedance angle is 54,101.8 Ω·mm −1 /4.589 %·mm −1 and 2.069°·mm −1 / 5.287 %·mm −1 in the gap range of 0–0.1 mm, respectively. Finally, a signal processing method is proposed for the simultaneous measurement of ethanol vapor concentration and gap. These results lay a foundation for the development of MWCNTs-based sensors and the sensors applied between narrow gaps.
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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 .
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危险品化学品经营许可证（带存储）