JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 3
·2239-2251
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IF 4.626
Zhao Qian,Wang Bowen,Qin Chenyuan,Li Qiuxuan,Liu Chuntai,Shen Changyu,Wang Yaming
In this work, biodegradable poly(lactic acid) (PLA)/Ti 3 C 2 T x MXene nanocomposites were prepared through melt compounding. The roles of MXene in nonisothermal melt and cold crystallization of PLA were explored. The morphology, structure and crystallization behavior were studied using polarized optical microscopy, wide-angle X-ray diffraction and differential scanning calorimetry. For nonisothermal melt crystallization, the presence of MXene increases the crystallinity and shortens the half-crystallization time but does not change the crystallization peak temperature of PLA. For nonisothermal crystallization from the glassy state, the incorporation of MXene decreases the cold crystallization peak temperature and reduces the crystallinity marginally but does not affect the half-crystallization time of PLA. The crystallization kinetics analysis based on the Avrami equation shows that, for both the melt and cold crystallization, the crystallization mechanism is unchanged irrespective of the addition of MXene. The investigation would be useful for understanding the correlation between processing and properties of PLA/MXene nanocomposites.
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高影响因子
CARBON
·
2021
·
IF 9.594
Biao Ji,Shangwu Fan,Sijie Kou,Xiaoyu Xia,Juanli Deng,Laifei Cheng,Litong Zhang
Ti 3 C 2 T X MXene has been proven to be a material of high application potential in the field of electromagnetic (EM) protection. Considering the density, MXene/polymer films (MPFs) are fabricated by employing the simple tape casting process and exhibit excellent electromagnetic shielding performance with respect to the MXene content. However, the absorption properties of as-fabricated MPFs are not satisfactory due to the impedance mismatch. Herein, a multilayer impedance gradient absorber with MPFs arranged in order has been successfully designed and prepared. The developed absorber possesses excellent EM wave absorption properties owing to the well-matched impedance and adjustment of permittivity. Moreover, the effect of the thickness of MPFs on the EM wave absorbing properties has been investigated by theoretical calculations and experimental measurements. The HFSS calculation reveals that the effective absorption bandwidth is capable to cover the whole X-band (8.2–12.4 GHz) with only a micro-adjustment of the thickness, with the minimum reflection coefficient (RC min) reaching up to −26.10 dB. In addition, the synergistic effect of the multiple loss mechanisms has been discussed in detail. This study not only proposes the effective design of a novel multilayer impedance gradient absorber, but also provides new fundamental basis for combining the simulation technology and material design.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Hengyu Zhang,Jianying Chen,Hui Ji,Ni Wang,Shuo Feng,Hong Xiao
Electromagnetic interference (EMI)-shielding materials with remarkable shielding effectiveness (SE) based on dominant absorption are highly desirable, especially if they are also flexible and lightweight. Herein, we prepared MXene (Ti3C2TX, TX-=O,-OH,-F)-based lightweight and absorption-dominant EMI-shielding non-woven fabrics. In view of the porosity and soft properties of textiles, as well as the unique high conductivity and hydrophilicity of Ti3C2TX MXene, Ti3C2TX MXene was coated on the fiber skeleton of three different non-woven fabrics made from polyester, cotton, and calcium alginate. The conductive layer formed by Ti3C2TX MXene on the fiber led to heterogeneous interfaces. They improved the multiple reflection of electromagnetic waves among Ti3C2TX MXene sheets and then contributed to the attenuation of the electromagnetic waves. Among all the samples, calcium alginate/Ti3C2TX MXene reached a maximum SE of 25.26 dB at 12.4 GHz with the fabric thickness of 3.17 mm. Cotton/Ti3C2TX MXene achieved maximum SSEt (ratio of specific shielding effectiveness (SSE) to thickness) of 2301.95 dB cm2g−1 at 1.36 mm with a loading of Ti3C2TX MXene of only 5.77mg/cm3. Further, fabric thickness, layer number, conductivity, and substrate type were selected to analyze the EMI-shielding mechanism.
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高影响因子
ELECTROANALYSIS
·
2021
·Vol. 33
·期 6
·1471-1483
·
IF 3.223
Shufang Ren,Runyan Feng,Shounian Cheng,Qingtao Wang,Zhixiang Zheng
Ti 3 C 2 T X MXene was synthesized by exfoliating pristine Ti 3 AlC 2 phase with hydrofluoric acid. The simple methods of mechanical mixing and drop-casting of Ti 3 C 2 T X and MWCNTs were carried out to prepare sensing electrode of Ti 3 C 2 T X /MWCNTs/GCE. The composite and topography, especially the surface functional groups of Ti 3 C 2 T X /MWCNTs were analyzed by XRD, SEM, FTIR, XPS, and Raman spectrum. The results turned out that Ti 3 C 2 T X was characteristic by accordion-like 2D nanostructure with the surfaces terminated with −OH, −F, and =O. When combining with acid pretreated, the interaction between the functional groups of Ti 3 C 2 T X and MWCNTs facilitated the convenience and reproducibility of the robust modified electrodes and could make Ti 3 C 2 T X /MWCNTs/GCE possess good synergistic catalytic acceleration by increasing the electron transfer efficiency as well as adsorption and aggregation of MOP analyte onto the electrode surface. Versatile electrochemical measurements of CV, DPV and EIS were used to investigate the electrochemical performance of Ti 3 C 2 T X /MWCNTs/GCE sensing platform. The linear detection range is 0.01–100 μM with the limit of detection of 0.0092 μM (S/N=3). The sensor has good stability, repeatability, reproducibility and anti-interference. In the detection of serum and urine samples, it has a good recovery rate.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Kangqi Chang,Le Li,Chao Zhang,Piming Ma,Weifu Dong,Yunpeng Huang,Tianxi Liu
Advanced pressure sensors featuring high compressibility , high sensitivity, fast response time, and superior stability have attracted tremendous research attention because of their potential applications in artificial intelligence technology and wearable electronics. In this work, a robust sponge-like piezoresistive pressure sensor with remarkable elasticity and high sensitivity was fabricated by anchoring perpendicularly oriented MXene flakes on polyaniline (PANI) wrapped polymeric sponge via freeze-drying-assisted depositing strategy. Owing to the stable 3D conducting networks provided by PANI sponge and the intimate electrical contact between erected MXene flakes upon subtle deformation, good sensitivity, wide working range, low detection limit, fast response and recovery times, and excellent durability can be simultaneously obtained. Furthermore, various physiological activities (speech recognition, swallowing, joint movement, etc.) can also be detected in real-time and wireless manner by the flexible MXene/PANI sponge sensors, demonstrating their great potential in low-cost and high-performance wearable piezoresistive pressure sensing devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zeyu Yuan,Junming Cao,Shulga Valerii,Hao Xu,Lili Wang,Wei Han
Sodium-ion batteries, as a promising alternative to the lithium-ion battery, have attracted extensive attention. However, due to the larger ion radius and higher standard reduction potential, the sodium-ion batteries still face poor cycle stability and relatively low energy density problems. In this work, a carbon sphere-supported Nb 2 CT x MXene/MoS 2 hierarchical structure has been designed and synthesized through hydrothermal and electrostatic self-assembly methods. The design strategy successfully improves the utilization efficiency of the MoS 2 carbon sphere as a support skeleton and reducing the diffusion path length of Na ions, leading to an improved specific capacity and rate performance. Moreover, Nb 2 CT x sheets also effectively inhibit the capacity attenuation caused by MoS 2 shedding, thus achieving the long cycle life of the sodium-ion battery. As a result, the carbon-supported MXene/MoS 2 anode delivers an ultrahigh reversible capacity, long cycling stability, and superior capacity retention rate. Notably, the carbon-supported MXene/MoS 2 anode can also obtain a considerable capacity of 196 mAh g −1 at a current density of 20 A g −1 . The full cell of SIBs was assembled, and the flexibility of the battery was tested. The density functional theory simulation results show that the sodium ion has a smaller diffusion barrier under this material design strategy.
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高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Xiaobo Chen,Jiangyue Zhu,Jianghao Cai,Yang Zhang,Xiaohua Wang
Herein, we report a composite structure by incorporating MoSe 2 nanosheets in organ-like Ti 3 C 2 T x MXene (MXene/MoSe 2 ) as new nanohybrid anode materials for high-performance asymmetric supercapacitors. Benefits of the positive advantages including unique heterostructure, enhanced active area for redox reactions, and beneficial synergetic interaction, the specific capacitance of the MXene/MoSe 2 composite electrode was high up to 1358.5 F g −1 at 1 A g −1 , much higher than that of the pure Ti 3 C 2 T x MXene and MoSe 2 electrodes. In addition, when applied the synthesized Ti 3 C 2 T x MXene/MoSe 2 nanohybrid as positive electrode in asymmetric supercapacitor (ASC), excellent performance is observed. For instance, a high specific energy of 55.6 Wh kg −1 , high specific power of 800.3 W kg −1 with the capacitance retention of 94.1% even after 10,000 cycles at a high current density of 5 A g −1 are obtained. These results indicate that the MXene/MoSe 2 composite will be a high promising candidate for supercapacitors.
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高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 12
·2002168
·
IF 6.147
Binxia Chen,Quancheng Song,Zehang Zhou,Canhui Lu
As a class of promising 2D material, MXenes are widely applied to energy storage systems (ESSs) due to metallic conductivity and high electrochemical activities, but the restacking problem during electrode preparation restricts their electrochemical performances. Herein, polyaniline nanofibers (PANINFs) are used as conductive interlayer spacers to induce the self-assembly of MXene (Ti 3 C 2 T x )-based electrode. The favored sandwiched porous structure is formed due to the electrostatic adsorption and hydrogen bond interaction between the positively charged PANINFs and the negatively charged Ti 3 C 2 T x nanosheets, which provide abundant accessible sites and facilitate the diffusion of ions. As a result, the flexible freestanding Ti 3 C 2 T x /PANINFs composite electrode exhibits high conductivity (1373.3 S cm –1 ) and excellent gravimetric capacitance of 645.7 F g –1 . Due to the enhanced structural stability, it achieves impressive cycling stability of 98% capacitance retention after 5000 cycles, which is significantly improved from that of pristine Ti 3 C 2 T x electrode (84.6%). This work provides a feasible strategy for the structure regulation and performance enhancement of MXene-based supercapacitors, which has great potential in energy storage systems.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chenyang Cai,Wenbin Zhou,Yu Fu
It remains a huge challenge to engineer MXene-based all-solid-state supercapacitors with high energy density , mechanical robustness, and geometrical flexibility to meet the increasing demand for the next generation of wearable and portable electronic devices because of serious restacking in the system and lacking of strong interactions in individual MXene nanosheets . In this work, inspired by mortar and brick structure of nacre, freestanding MXene nacre was developed via layer-by-layer assembly for mechanical robustness and geometrical flexibility, with its greatly improved photothermal conversion ability and the effectively suppressed restacking of MXene nanosheets. Specifically, 1D cellulose nanofibrils and 2D SnS 2 were applied as building blocks for assembling structure-layered 3D architecture and effective intercalator for suppressing recalcitrant restacking of nanosheets. Additionally, the in situ grown SnS 2 was also functioned as extra H + transport paths and superior photothermal promotor. Thanks for the 3D hierarchy, the resulted MXene “nacre” showed excellent mechanical strength (78.3 MPa) without sacrificing flexibility, favorable specific capacitance (190F g −1 in 1 M H 2 SO 4 at scan rate of 10 mV/s), and a high capacitance retention (87.4% after 5000 cycles), which was higher than those in other reports. The nacre-inspired all-solid-state supercapacitor delivered a high energy density of 6.7 μWh cm −2 , 91.5% capacitance retention after 4000 cycles and superior cyclability (over 90% capacitance retention after 500 times of folding/unfolding). Benefiting from electrical transport ability of SnS 2 under solar irradiation, the flexible MXene supercapacitor also showed outstanding solar-thermal conversion ability, with 60% increase in capacitance under solar intensity of 1 kW/m 2 . This work provides a new strategy for the fabrication of mechanically robust multifunctional MXene electrodes of all-solid-state photothermo-supercapacitors for further applications in structural flexible energy storage devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yan Zheng,Wanyi Chen,Yi Sun,Caixiu Huang,Zhaoqun Wang,Dongshan Zhou
Recently, two-dimensional transition metal carbide/nitride (MXene) and its composites with polymers have attracted great interest from researchers due to their potential applications in flexible electronics, electromagnetic shielding , catalysis, and energy storage. However, the easy oxidation of MXene and the low efficiency of traditional composites preparation methods have brought great challenges to the practical application of polymer/MXene composites. Here, we prepared polystyrene/Mxene (PS/MXene) composites with a 3D conductive network structure through particle construction strategy. Because of the compact and ordered structure, the conductivity of the material reached 3846.15 S/m when the filler content was only 1.81 vol%, and it can retain 53.4% of the initial value after 180 days. Furthermore, based on the 3D network, we orientated the MXene nanosheets in the matrix to form the MXene orientated 3D network binary structure. This unique structure design further increased the utilization rate of MXene and made the material conductivity reach to 4471.13 S/m, with the percolation threshold as low as 0.175 vol%. We believe that this research can provide a feasible way for the practical application of MXene composite materials.
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PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Bijiang Geng,Shuang Xu,Longxiang Shen,Fuling Fang,Wenyan Shi,Dengyu Pan
TiO 2 -based semiconductor nanosonosensitizers have been extensively explored for sonodynamic therapy (SDT) against deep-seated tumors, but their clinical applications are limited by low reactive oxygen species (ROS) quantum yields owing to their rather wide bandgaps (∼3.2 eV). Herein, we report Ti 3 C 2 -based two-dimensional (2D) MXene nanosheets with a bandgap of only ∼0.94 eV, induced by surface terminations (-F, –OH), were employed as a novel narrow-bandgap nanosonosensitizer for effective SDT. To improve the stability and SDT performance of the MXene nanosheets, 0D/2D hybrid heterojunctions (HJs) were also introduced between Ti 3 C 2 nanosheets and graphitic N doped carbon dots. Taking the advantage of the HJ-enhanced carrier transfers, the designed CD@Ti 3 C 2 T x HJs exhibited a remarkably enhanced ROS generation efficiency, which was 3.07 times than that of commercial TiO 2 nanoparticles. The CD@Ti 3 C 2 T x HJs were also found to offer enhanced photothermal conversion efficiency in the NIR-II biowindow (64.5%). By using the mild photothermal effect to alleviate tumor hypoxia in the “cold” tumor microenvironment (TME), complete tumor ablation was realized by the mild NIR-II PTT-enhanced deep-tissue SDT. This work presents the promising potential of MXene-based 2D materials for noninvasive SDT of deep-seated tumors.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 40
·21131-21141
·
IF 11.301
Qianming Li,Rui Yin,Dianbo Zhang,Hu Liu,Xiaoyu Chen,Yanjun Zheng,Zhanhu Guo,Chuntai Liu,Changyu Shen
With the rapid development of artificial intelligence, high-performance flexible strain/pressure sensors with excellent wearing comfortability are in urgent demand. In this study, a flexible conductive MXene/cellulose nanocrystal (CNC) coated thermoplastic polyurethane (TPU) non-woven fabric (NWF) was fabricated via a simple dip-coating technique for the fabrication of wearable strain/pressure sensors. Especially, a pre-stretching treatment was applied to the conductive NWF to prepare strain sensors with a special micro-crack structure based on the modulus deviation between the rigid conductive layer and elastic TPU matrix, and controllable crack density was constructed through changing the CNC loading of the conductive layer. As a result, wearable strain sensors with a tunable sensitivity and working range were successfully obtained based on the sensor's crack density, and the MC0.6@p-NWF based strain sensor displays a broad sensing range of 83%, high sensitivity (GF = 3405) and an ultralow detection limit (0.1%) based on the opening/closing of micro-cracks. Furthermore, a tunable wearable pressure sensor was also designed by simply stacking the sensing conductive NWF layers together, and higher sensitivity was achieved for the sensor with more sensing layers, which is mainly ascribed to the more contact area change in the interface between adjacent NWF layers upon compression. More importantly, the conductive NWF based strain/pressure sensors displayed stable sensing behaviors towards various strain/frequency levels, short response/recovery time and excellent long-term sensing stability. As expected, they can be successfully applied in various applications, ranging from real-time full-range human body motion monitoring (e.g. finger, wrist movement), human physical signal collection (e.g. pulse, swallowing and respiration) and flexible artificial electronic skin (E-skin). Our study provides an effective strategy for the fabrication of wearable strain/pressure sensors with desirable comprehensive performance in the field of artificial intelligence.
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高影响因子
危险品化学品经营许可证（带存储）