CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Cheng Han,Huan Zhang,Quan Chen,Tao Li,Lingjian Kong,Hui Zhao,Lirong He
Directional sensors endowed by inherent anisotropic structure have drawn great attention in intelligent sensing systems. Unidirectional lyophilization is the mainstream technique to architect anisotropic structure particularly for water dispersible systems as the ice template can be readily removed at the melting point of water (0 °C). However, it is impractical for water insoluble polymers such as piezoelectric polymer systems as it features extremely low lyophilization temperature (for instance, −61 °C). So far, no piezoelectric polymer derived anisotropic devices has been realized. In this work, for the first time, we succeeded the constructing of anisotropic PVDF/Mxene device with directionally oriented micropores through delicate formulation design which enables the maintaining of oriented template even at temperature above 0 °C. As a result, the as-fabricated PVDF/Mxene composite foam exhibits distinct anisotropic behavior, featuring compressive modulus along the direction of penetrating microchannels being approximately 1.7 times of that in the orthogonal direction. The anisotropic foam is applied as directional sensor with piezo-current as the output signal, which displays a 3.93-fold higher sensitivity difference in the direction perpendicular to the microchannel than in its orthogonal direction. Moreover, the foam exhibits the highest sensitivity of 41.3nA/kPa over pressure range of 2.5–20 kPa, which outperforms state-of-the-art polymer piezoelectric sensors. This novel strategy provides a practical avenue for architecting water-insoluble polymer-derived devices with anisotropic structure in a green and energy-saving manner, which could spur innovations from the fields of electromagnetic interference shielding, energy storage, piezoresistive, thermal insulation and so on wherever anisotropic characteristic is desired.
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高影响因子
TALANTA
·
2022
·
IF 6.556
Lu Zhang,Chenxing Li,Yongqiang Yang,Jingxuan Han,Wenwei Huang,Jiayi Zhou,Yan Zhang
With the development of new methods for the medical diagnosis, electrochemical sensors have attracted increasing attention. However, biofouling on the surface of the sensor significantly decreases sensor performance, thereby limiting the application of electrochemical sensors in complex biological fluids. Given the urgent need for anti-biofouling electrodes, a sensor based on a glass carbon electrode (GCE) modified with Ti 3 C 2 T X MXene and electrochemically reduced holey graphene (ERHG) was fabricated and demonstrated to have excellent electrochemical performance and anti-biofouling properties. ERHG provides abundant surface-active sites and imparts stability by hindering the agglomeration and oxidation of MXene. Furthermore, the excellent conductivity and hydrophilicity of MXene result in a high electron transfer rate and strong hydrophilicity. The MXene-ERHG/GCE sensor can detect dopamine with a wide linear range (0.2–125 μM) and a low detection limit of 0.044 μM in phosphate-buffer saline solution. Importantly, the hydrophilicity of MXene-ERHG reduces non-specific protein adsorption on the electrode surface, providing resistance to biofouling. After immersion in bovine serum albumin for 30 min, MXene-ERHG/GCE retained 85.90% of its initial peak current value, much higher than that of ERHG/GCE (17.75%). The MXene-ERHG/GCE sensor also showed good sensitivity for dopamine detection in serum and artificial cerebrospinal fluid (aCSF) containing bovine serum albumin. Moreover, MXene-ERHG/GCE exhibited excellent reproducibility and long-term stability in aCSF. The results demonstrate that MXene-ERHG/GCE has excellent anti-biofouling performance, and shows potential as an electrode material for application in biosensing.
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PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 15
·2200103
·
IF 5.006
Zhiwen Zeng,Shan Yu,Cuiping Guo,Daohuan Lu,Zhijie Geng,Dating Pei
Conductive hydrogels used as electronics have received much attention due to their great flexibility and stretchability. However, the fabrication of ideal conductive hydrogels fulfilling the excellent mechanical properties and outstanding sensitivity remains a great challenge until now. Moreover, high sensitivity and broad linearity range are pivotal for the feasibility and accuracy of hydrogel sensors. In this study, a conductive supramolecular hydrogel is engineered by directly mixing the aqueous dispersion of MXene with the precursor of N -acryloyl glycinamide (NAGA) monomer and then rapidly photo cross-linked by UV irradiation. The resultant PNAGA/MXene hydrogel-sensors exhibit high mechanical strength (4.8 MPa), great stretchability (630%), and excellent durability. The conductive hydrogel-based sensor presents excellent conductivity (17.3 S m −1 ) and a wide scope of linear dependence of sensitivity on strain (0%–125%, gauge factor = 2.05). It displays reliable detection of various motions, including repeated subtle movements and large strain. It also shows good degradation in vitro and antifouling capability. This work may provide a simple and promising platform for engineering conductive supramolecular hydrogels with integrated high performance aiming for smart wearable electronics, electronic skin, soft robots, and human–machine interfacing.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Xiao Zhang,Dong An,Zhaoshun Bi,Wei Shan,Beibei Zhu,Long Zhou,Liangmin Yu,Han Zhang,Shuwei Xia,Meng Qiu
High-resolution electrochemical sensors with excellent sensitivity and selectivity are urgently needed for simultaneous monitoring of heavy metal ions (HMIs) in the environment. In this study, a nitrogen-doped carbon-coated Ti 3 C 2 -MXene heterostructure (Ti 3 C 2 @N-C)-based electrochemical sensor was developed for simultaneously determining (Cd 2+ ) and (Pb 2+ ) in seawater and tap water via square wave anodic stripping voltammetry (SWASV). The sensor exhibits excellent performance with a low limit of detection (LOD) (Cd 2+ 2.55 nM, Pb 2+ 1.10 nM), as well as excellent selectivity in the presence of interfering ions (Zn 2+ , Fe 3+ , Fe 2+ , Co 2+ , Ni 2+ , Mn 2+ , Cu + , Cu 2+ , and K + ) and high resolution for simultaneous detection of Cd 2+ and Pb 2+ . The N-C and Ti 3 C 2 -MXene heterostructure improves the conductivity of the composites by accelerating the electron transfer. The nitrogen-doping in Ti 3 C 2 @N-C provides adsorbent sites for electrons to coordinate with HMIs. Due to the heterostructure and the coordination by nitrogen, the interface charge transfer is enhanced and the number of selective adsorption sites is increased, improving the metals determination performance. This study proposes a new strategy for improving the electrochemical characteristics of Ti 3 C 2 -MXene by using heterostructure and nitrogen-doping effect, and develops a highly sensitive sensor for selective and simultaneous determination of HMIs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuhang Wang,Guangxin Fan,Dafeng Zhang,Yanping Fan,Baozhong Liu
The enhanced effect of metal catalysts is crucial to achieve advanced performance of hydrogen storage system. Rational design of catalysts with superior catalytic activity is significant to regulate the re-/hydrogenation kinetics of MgH 2 . Herein, Ti 3 C 2 -supported praseodymium(III) fluoride (PrF 3 ) nanoparticles (PrF 3 /Ti 3 C 2 ) composite was prepared by hydrothermal method , which exhibited superior catalytic activity toward hydrogen storage of MgH 2 . The onset temperature of dehydrogenation was reduced to 180 °C after adding 5 wt% PrF 3 /Ti 3 C 2 , corresponding to a reduction of 107 °C compared with pristine MgH 2 . About 7.0 wt% hydrogen was rapidly desorbed within 3 min at 260 °C and 6.6 wt% hydrogen was absorbed within 36 s at 200 °C for MgH 2 -5 wt% PrF 3 /Ti 3 C 2 . Moreover, MgH 2 -5 wt% PrF 3 /Ti 3 C 2 exhibited an excellent capacity retention of 92.5% even after 10 cycles. Experimental results reveal that the electron transfer among Ti-species (Ti 0 , Ti 2+ , and Ti 3+ ) occurred due to the striking enhanced effect of PrF 3 on Ti 3 C 2 MXene during the reaction process, and the synergistic action between Ti-species and PrF 3 are responsible for the markedly enhanced hydrogen storage properties of MgH 2 . This study is helpful to the design and optimization of hydrogen storage materials for mobile application.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xue Wang,Mengjia Li,Shuang Yang,Xuting Bai,Jiajia Shan
p -Nitrophenol ( p -NP) is an important phenolic environmental pollutant. The development of novel rapid determination methods for p -NP is of significance for environmental monitoring. In this work, a sensitive electrochemical sensor based on Ti 3 C 2 T X MXene/graphene composite was developed to detect p -NP in aqueous samples. Firstly, delaminated titanium carbide (D-Ti 3 C 2 T X ) was successfully prepared via an optimized minimally intensive layer delamination (MILD) method, which was further followed by the self-assembly method to form D-Ti 3 C 2 T X /graphene (D-Ti 3 C 2 T X /GR) composite. The prepared materials were characterized by scanning electron microscopic (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and Raman spectroscopy. Then the glassy carbon electrode (GCE) was modified by D-Ti 3 C 2 T X /GR composite to prepare the D-Ti 3 C 2 T X /GR/GCE sensor. The electrochemical behavior of D-Ti 3 C 2 T X /GR/GCE was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronocoulometry. Furthermore, the proposed sensor showed a strong electrochemical response based on the p -NP reduction reaction, benefiting from abundant active sites, fast electron transfer, and excellent electro-catalytic performance of the D-Ti 3 C 2 T X /GR composite. Under the optimal conditions, the D-Ti 3 C 2 T X /GR based electrochemical sensor displayed a linear response in the p -NP concentration range from 1 to 175 μmol·L −1 with a detection limit of 0.16 μmol·L −1 . The anti-interference performance, reproducibility, stability, and recovery in real sample analysis were also further evaluated. This study provided a novel and sensitive method for the rapid determination of p -NP in environmental samples.
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Nanoscale
·
2022
·Vol. 14
·期 24
·8640-8648
·
IF 8.307
Tao Chen,Changyu Yang,Xuewen Hu,Qicheng Zhang,An Cai,Huibin Liu,Yang Li,Wenchao Peng,Fengbao Zhang,Xiaobin Fan
Aqueous rechargeable zinc-ion batteries (ZIBs) are emerging in grid energy storage due to zinc abundance and intrinsic safety. However, developing suitable cathode materials with satisfactory stability and rate capacity remains a great challenge. Herein, a structure of layered MXene derived nanoporous VOx wrapped with graphene nanosheets (rGO–VOx) is constructed as a cathode for ZIBs. The incorporation of two typical 2D materials imparts composites with shortened diffusion pathways and increased electrical conductivity. Thus, the rGO–VOx cathode exhibits a remarkable rate capability of 196 mA h g−1 at 8 A g−1 and long-term stability with 90% retention after over 1200 cycles at 5 A g−1 in an aqueous coin cell. The Zn storage mechanism is also systematically investigated. The layered V2O5 transforms into layered ZnxV2O5·nH2O with larger interspacing upon cycling. NaV6O15 and the in situ formed ZnxV2O5·nH2O co-contribute to the subsequent insertion and extraction process.
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PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1142
·
IF 5.719
Mei Wan,Congling Shi,Xiaodong Qian,Yueping Qin,Jingyun Jing,Honglei Che
In this work, a novel functionalization strategy for ZIF-67-modified layered MXene was proposed, aiming at improving the fire safety of thermoplastic polyurethanes (TPU). The ZIF-67@MXene was verified by microscopic morphology, elemental composition, functional group species and crystal structure, and then the successfully prepared ZIF-67@MXene was introduced into the TPU material. When ZIF-67@MXene content was only 0.5 wt%, the peak heat release rate, total heat release rate, peak smoke release rate, total smoke release rate, and CO yield of the TPU/ZIF-67@MXene composites were reduced by 26%, 9%, 50%, and 22%, respectively, compared with the pure TPU. The thermogravimetric tests showed that the residual char of TPU/ZIF-67@MXene composites was the most in all samples. In short, the high-quality carbon layer of TPU/ZIF-67@MXene composites acts as a physical barrier to the transfer of heat and toxic gases, greatly improving the flame retardant properties of the TPU polymer.Keywords:metal-organic framework ZIF-67;MXene;fire safety;thermoplastic polyurethanes
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Polymers
·
2022
·Vol. 14
·期 11
·2157
·
IF 4.967
Zhaoxia Luo,Xiaolin Li,Suhe Zhao,Lianghua Xu,Li Liu
Thermoplastic polyurethane (TPU) is a kind of dielectric elastomer (DE) which can behave as an actuator, altering thickness strain in response to electrical stimulation. The composites are made up of fillers with a very high dielectric constant that are spread in a polymer matrix. It is very difficult to obtain large deformation at low voltage. In this study, we made two-dimensional (2D) MXene nanosheets with excellent conductivity and one-dimensional (1D) polydopamine (PDA)-modified CNT fiber fillers. After that, TPU dielectric elastomer films made of MXene/CNTs or MXene/CNTs@PDA were prepared. The results showed that the dielectric constant and dielectric loss of TPU dielectric film including MXene/CNTs were much higher than that containing MXene/CNTs@PDA, although Young’s modulus and breakdown strength (Eb) were significantly lower. At the same time, these two types of dielectric films had a significantly higher dielectric constant and dielectric loss than pure TPU dielectric film, and their breakdown strength was significantly lower. The compatibility of CNTs@PDA fibers with the TPU matrix improves after PDA modification, and the dispersion of CNTs@PDA fibers improves, resulting in an increase in Young’s modulus. MXene with a two-dimensional nanosheet structure increases the breakdown strength of the TPU dielectric elastomer under the condition of the addition of a tiny quantity. To summarize, the dielectric constant, dielectric loss, Young’s modulus, and dielectric elastomer breakdown strength are mutually restrictive conditions, and the relationship between all parties must be balanced to obtain obvious deformation properties.Keywords:dielectric elastomer;CNTs;PDA;MXene
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高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·468-477
·
IF 3.074
Lin Chen,Ye Sun,Jiawen Wang,Chao Ma,Shuyi Peng,Xingyu Cao,Lang Yang,Chunxin Ma,Gaigai Duan,Zhenzhong Liu,Hui Wang,Yihui Yuan,Ning Wang
Although diverse uranium (U) adsorbents have been explored, it is still a great challenge for high-efficient uranium extraction form seawater. Herein a wood-mimetic oriented porous Ti 3 C 2 T
x
-MXene/gelatin hydrogel (MGH) has been explored through growing directional ice crystals cooled by liquid nitrogen and subsequently forming pores by freeze-dry (Ice-template) method, for ultrafast and high-efficient U-adsorption from seawater with great enhancement by both electric field and sunlight. Different from disperse Ti 3 C 2 T
x
-MXene powder, this MGH not only can be easily utilized but also can own ultrahigh specific surface area for high-efficient U-adsorption. The U-adsorbing capacity of this MGH (10 mg) can reach 4.17 mg·g −1 after only 1 week in 100 kg of seawater, which is outstanding in existing adsorbents. Furthermore, on the positive pole of 0.4 V direct current source or under 1-sun irradiation, the U-adsorbing capacity of the MGH can increase by 57.11% and 13.57%, respectively. Most importantly, the U-adsorption of this hydrogel can be greatly enhanced by simultaneously using the above two methods, which can increase the U-adsorbing capacity by 79.95% reaching 7.51 mg·g −1 . This work provides a new biomimetic porous MXene-based hydrogel for electric field/sunlight bi-enhanced high-efficient U-extraction from seawater, which will inspire new strategy to design novel U-adsorbents and systems.
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POLYMER TESTING
·
2022
·
IF 4.931
Zhaoxia Luo,Liqun Zhang,Yongri Liang,Shipeng Wen,Li Liu
To achieve high deformation under a low electric field intensity is still a big challenge for the dielectric elastomers (DE) potentially used in artificial electronic skin and artificial muscles. Herein, poly-dopamine (PDA) modified 1D barium titanate (BT@PDA) nanofibers and 2D MXene nanosheets with high aspect ratio and large dipole moment were fabricated, and introduced into TPU elastomers. Results showed that the interfacial polarization and micro-capacitor structure formed by MXene sheets lead to the high dielectric constant, and high dielectric loss of MXene/TPU composites with low modulus. The interfacial polarization caused by BT@PDA nanofibers resulting in high dielectric constant and low dielectric loss of BT@PDA/TPU composites with high modulus. Combing the advantages of the two fillers, the MXene/BT@PDA/TPU composites showed high dielectric constant, low dielectric loss, low modulus. The electrical sensitivity factor of 0.5 wt% MXene/5 wt% BT@PDA/TPU composite (11.38) was much higher than the sum of that of 0.5 wt% MXene/TPU (1.73) and 5 wt% BT@PDA/TPU (4.35) composites at a low filler content, showing the 0.5 wt% MXene/5 wt% BT@PDA/TPU dielectric composite had a large deformation under a low electric field. This work can provide an effect strategy to design DE nanocomposites with good deformation performance.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Guifang He,Lili Wang,Xiaojing Bao,Zhiwei Lei,Fanggang Ning,Meng Li,Xiansheng Zhang,Lijun Qu
Flexible wearable heaters have received increasing attention in energy-saving, diverse personal thermal requirements, and healthcare management. Herein, considering the fire safety application of wearable heaters, the biodegradable alginate fibers and flame retardant (FR) viscose fibers are attempted to mix and weft-knit into the fabric, which interestingly exhibits synergetic flame retardancy with low afterflame time, afterglow time, and peak heat release rate . Further, assisted by the highly conductive Ti 3 C 2 T x (MXene) nanosheets on the surface of the fabric and the periodic nested loops of the knitted fabric, the integrated fabrics possess excellent electrical performance (2Ω sq −1 ) with the MXene content of 9.13 wt%, electromagnetic interference (EMI) shielding efficiency of 55 dB in the X band , preferable Joule heating performance under safe low voltage (123 °C at 3.5 V) and sunlight/far-infrared heating performance. The superior flame retardancy and multifunctional properties arose from the high-temperature induced well-constructed char layer, unique functionality of interconnected MXene network and multiple scattering of light or wave. Combined with the superior flame retardancy and multifunctional properties, the weft-knitted alginate/FR viscose fabrics with MXene coating become the ideal candidate materials in the fields of wearable heaters with high safety.
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高影响因子
危险品化学品经营许可证（带存储）