JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yong Luo,Yuhui Xie,Wei Geng,Guangfu Dai,Xinxin Sheng,Delong Xie,Hua Wu,Yi Mei
Recently, two-dimensional MXene demonstrated promising advantages to improve the flame-retardant performance of composites; however, its compatibility with polymer matrix is a great concern. In this study, MXene was first functionalized with phosphorylated chitosan (PCS) to obtain the PCS-MXene nanohybrid. The resulting nanohybrid was introduced into the thermoplastic polyurethane (TPU) matrix via solution mixing followed by the hot-pressing method, affording TPU/PCS-MXene nanocomposite. The resulting nanohybrid exhibited superior compatibility with the TPU matrix, enhancing mechanical performance of the TPU/PCS-MXene nanocomposite compared to the pristine TPU and TPU/MXene nanocomposite. Besides, the flame-retardant performance of TPU/PCS-MXene nanocomposite was greatly enhanced, while the smoke emission was effectively suppressed. As only 3 wt% PCS-MXene was introduced, peak heat release rate, total heat release, and total smoke production of the composite decreased by 66.7%, 21.0%, and 27.7%, respectively, compared to the pristine TPU. Systematical characterization was then carried out to investigate the enhancement mechanism of PCS-MXene, highlighting the crucial role of PCS combined with the catalytic effect of MXene. In brief, the compatibility issues of MXene were effectively addressed, and its flame-retardancy enhanced greatly via the PCS modification, the bio-based characteristic of which, in turn greatly benefits the further development of MXene-polymer composite.
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高影响因子
CARBON
·
2021
·
IF 9.594
Xiaopeng Han,Ying Huang,Sai Gao,Guozheng Zhang,Tiehu Li,Panbo Liu
Continuous 3D hierarchical construction has been proved to serve as a feasible method to prepare high-efficiency microwave absorption (MA) composites. Herein, an innovative hierarchical carbon fiber (CF)@MXene@ZnO core-sheath synergistic structure with tunable and efficient MA performance has been synthesized via a self-assembly (MXene) and hydrothermal (ZnO) process. Because of increased conductivity loss of the interlayer MXene sheath due to synergistic effects and the enhanced impedance matching of the outer ZnO layer, the optimal reflection loss (RL) value of CMZ2 is −67.35 GHz at 9.0 GHz at a thickness of 3.5 mm and the optimal effective absorption bandwidth (EAB) is 5.44 GHz, covering the full X band at a thickness of 4.0 mm. Furthermore, the CMZ microrods can be used as energy transformers and molecular heaters due to the synergistic effects of the high photothermal conversion efficiency of MXene, high photocatalytic activity of ZnO, and high thermal conductivity of CF. When used as wearable CMZ/polyurethane (PU) composite coatings , the surface temperature increases rapidly with a healing efficiency of above 91% for mechanical damage. These results provide a new strategy to fabricate wearable materials with effective MA and photothermal properties for designing safe and wearable devices .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xianhong Zheng,Qiaole Hu,Zongqian Wang,Wenqi Nie,Peng Wang,Changlong Li
Smart wearable electronics have drawn increasing attention for their potential applications in personal thermal management, human health monitoring, portable energy conversion/storage, electronic skin and so on. However, it is still a critical challenge to fabricate the multifunctional textiles with tunable morphology and performance while performing well in flexibility, air permeability , wearing comfortability. Herein, we develop a novel roll-to-roll layer-by-layer assembly strategy to construct bark-shaped carbon nanotube (CNT)/Ti 3 C 2 T x MXene composite film on the fiber surface. The fabricated bark-shaped CNT/MXene decorated fabrics (CMFs) exhibit good flexibility, air permeability and electrical conductivity (sheet resistance, 6.6 Ω/□). In addition, the CMFs demonstrate good electrothermal performance (70.9 °C, 5 V), electromagnetic interference (EMI) shielding performance (EMI shielding effectiveness, 30.0 dB under X-Brand), and high sensitivity as the flexible piezoresistive sensors for monitoring the human motions. Importantly, our CMFs show distinctive EMI shielding mechanism, where a great proportion of incident electromagnetic microwaves are reflected by the bark-shaped CNT/MXene films owing to the multi-interface scattering effects. This work may provide a new strategy for the fabrication of multifunctional textile-based electronics and pave the way for smart wearable electronics.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Ke Wang,Xianhe Li,Nan Wang,Quanhao Shen,Maochang Liu,Jiancheng Zhou,Naixu Li
Solar photocatalysis has long relied on the rational design of semiconductor photocatalysts. Herein, a ternary meso-TiO2@ZnIn2S4/Ti3C2 MXene photocatalyst is prepared and demonstrated with a core–shell structure accompanied by few-layered Ti3C2 Mxene on the ZnIn2S4 shell. The success of the synthesis depends on a two-step method consisting of hydrothermal and electrostatic self-assembly procedures. The ternary heterojunction exhibits a good behavior for photocatalytic CO2 reduction. A mechanism study of the photocatalytic reaction indicates that the photogenerated charges transfer in a Z-scheme pathway. Moreover, the construction of the Schottky junction between metallic Ti3C2 and TiO2@ZnIn2S4 is extremely effective for the reduction reaction. Consequently, the photocatalytic rates toward CO and CH4 production are up to 30.5 and 34.0 μmol/g within 3 h of illumination by simulated sunlight, respectively, while the CH4 selectivity reaches 52.7%. This work provides a good strategy to achieve highly efficient photocatalytic CO2 reduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yan Zhang,Jin Yu,Jiayu Lu,Chenjie Zhu,Dongming Qi
Rapid growing of electronics has not only caused severe electromagnetic wave pollution, but also created a risk of fire and explosion. Therefore, developing ultralight, fire-resistant, high-performance electromagnetic interference (EMI) shielding materials are imperative but also challenging. Considering the outstanding metallic conductivity and high aspect ratio, 2D Ti 3 C 2 T x has been reported to be one of the most promising candidates for exhibiting excellent EMI shielding performance. Herein, we demonstrate a facile method to fabricate cellulose nanofiber (CNF)/ammonium polyphosphate (APP)/Ti 3 C 2 T x composite aerogels via a simple freeze-drying method. The resultant CNF/APP/Ti 3 C 2 T x composite aerogels exhibited excellent fire-resistance without obvious shrinkage when placed over the flame of an alcohol burner. Besides, the 8-mm-thick composite aerogel with 60% of Ti 3 C 2 T x showed an average EMI shielding effectiveness of 55 dB (specific EMI shielding effectiveness/thickness could be ~5729 dB cm 2 g −1 ) with an absorption-dominant mechanism. This performance is owing to the relative high electrical conductivity (12 S/m) and multiple reflections from the porous structure. These characteristics make the composite aerogel a much more competitive product for a high-performance EMI shielding material.
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Micromachines
·
2021
·Vol. 12
·期 3
·252
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IF 2.891
Feiyu Fang,Han Wang,Huaquan Wang,Xiaofei Gu,Jun Zeng,Zixu Wang,Xindu Chen,Xin Chen,Meiyun Chen
In this work, a novel flexible electrically resistive-type MXene/Thermoplastic polyurethanes(TPU) based strain sensors was developed by a composite process of electrospinning (ES) and electrostatic spray deposition (ESD). Compared with other deposition processes, the sensing layer prepared by ESD has better adhesion to the ES TPU nanofiber membrane and is not easy to crack during the stretching process, thereby greatly improving the working range of the strain sensor. Furthermore, we obtained the sandwich structure easily by ES on the surface of the sensing layer again. This will help make the stress distribution more uniform during the stretching process and further increase the strain sensing range. The ESD-ES strain sensors were attached on skin to monitor various human motions. The results demonstrate that our ESD-ES strain sensors have wide application prospects in smart wearable device.Keywords:strain sensor;electrospinning;electrostatic spray deposition;MXene
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ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Tian-Zhu Shi,Yu-Long Feng,Tao Peng,Bao-Guo Yuan
Fe 2 O 3 is one of promising negative materials for supercapacitors (SCs), because of its low cost and high theoretical value of specific capacitance. However, the inferior conductivity and insufficient ionic diffusion rate of Fe 2 O 3 will seriously hinder the electrochemical performance of Fe 2 O 3 , resulting in limiting its practical application in SCs. Herein, a sea urchin-like 3D Fe 2 O 3 was synthesized via hydrothermal methods. And then, the 2D Ti 2 C 3 T x MXene nanosheets with high conductivity closely self-assemble on the surface of Fe 2 O 3 to provide efficient pathways for the rapid electrons transport. In addition, the sea urchin-like structure of Fe 2 O 3 can facilitate the rapid diffusion of the electrolyte to accelerate faradaic reaction. The optimized Fe 2 O 3 /MXene composite as electrode material exhibits a high specific capacitance of 486.3 F g −1 at current density of 1 A g −1 , and excellent cycling stability with 95.7% capacity retention after 5000 charge/discharge cycles. Furthermore, an asymmetric supercapacitors (ASCs) device was assembled by using Fe 2 O 3 /MXene composite as anode and MnO 2 as cathode, showing a high energy density of 32.2 Wh kg −1 at the power density of 900.6 W kg −1 , and remarkable long-term durability (95.7 % capacitance retention after 5000 cycles). This work demonstrates an effective approach of integrating the sea urchin-like Fe 2 O 3 with 2D MXene nanosheets to fabricate Fe 2 O 3 /MXene composite for high-performance SCs.
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Polymers
·
2021
·Vol. 13
·期 11
·1820
·
IF 4.329
Lu Liu,Guobing Ying,Yinlong Zhao,Yuexia Li,Yiran Wu,Dong Wen,Meng Wu,Minghui Wang,Qingzhong Zhou,Xiang Wang,Cheng Wang
As a member of two-dimensional (2D) materials, MXene is an ideal reinforcement phase for modified polymers due to its large number of polar functional groups on the surface. However, it is still relatively difficult to modify any functional groups on the surface of MXene at present, which limits its application in enhancing some polymers. Herein, one-dimensional (1D) attapulgite (ATP) nanomaterials were introduced onto the surface of MXene to form ATP–MXene hybrids, which successfully improved the mechanical properties of the epoxy composites. ATP with appropriate content can increase the surface roughness of the MXene lamellae to obtain better interface interaction. Therefore, remarkable enhancement on the mechanical property was achieved by adding M02A025 (0.2 wt % MXene and 0.25 wt % ATP), which is the optimum composition in the hybrids for composite mechanical properties. Compared to neat epoxy, the tensile strength, flexural strength and critical stress intensity factor (KIC) of M02A025/epoxy are increased by 88%, 57%, and 195%, respectively, showing a high application prospect.Keywords:MXene Ti3C2Tx;attapulgite;hybrids;epoxy-matrix composites;mechanical properties
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yaping Cao,Hui Chen,Yupeng Shen,Mei Chen,Yelong Zhang,Lanying Zhang,Qian Wang,Shaojun Guo,Huai Yang
Potassium-ion batteries (KIBs) are emerging as the prospective alternatives to lithium-ion batteries in energy storage systems owing to the sufficient resources and relatively low cost of K-related materials. However, serious volume expansion and low specific capacity are found in most materials systems resulting from the large intrinsic radius of K+. Herein, SnS2 nanosheets anchored on nitrogen and sulfur co-doped MXene (SnS2 NSs/MXene) are creatively designed as advanced anode materials for KIBs. SnS2 NSs/MXene with a unique hierarchical structure can not only provide fast transmission channels for K+ but also avoid the accumulation of K+ and volume expansion. These novel features make SnS2 NSs/MXene electrodes exhibit a superior reversible specific capacity of 342.4 mA h g–1 under 50 mA g–1. Also, they maintain 206.1 mA h g–1 at an even higher current density of 0.5 A g–1 over 800 cycles almost without capacity decay. Moreover, the multistep alloying reaction mechanism of SnS2 NSs/MXene composites and K+ is revealed by the ex situ X-ray diffraction measurement. In addition, the density functional theory calculations confirm the existence of Ti–S bonds between SnS2 nanosheets and MXene, which significantly enhance the structural stability and cycling electrochemical performance of SnS2 NSs/MXene composites.
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Analytical Methods
·
2021
·Vol. 13
·期 22
·2512-2518
·
IF 2.896
Fenghui Zhu,Xiuyun Wang,Xiaowen Yang,Chenfei Zhao,Yue Zhang,Siqi Qu,Shuo Wu,Wei Ji
Sensitive detection of H2O2 in the nano- to micromolar range is critical for health monitoring and disease diagnosis. Two-dimensional transition metal carbides or/and nitrides (called MXenes, MXs) have excellent potential applications in the electrochemical field due to their outstanding electrical conductivity and catalytic properties. In this work, Ti3C2Tx (MX) was employed for the construction of a sensitive and enzyme-free electrochemical sensing interface for the detection of hydrogen peroxide (H2O2) through a simple and effective method. Prussian blue (PB) was electrochemically deposited on the surface of a glassy carbon electrode (GCE). Chitosan (CS) and MX were sequentially dripped onto the PB modified GCE surface. The reasonable fabrication of the MX/CS/PB/GCE sensing interface presented good electrochemical sensing performance towards H2O2 with a low limit of detection (4 nM), a wide linear range from 50 nM to 667 μM and good selectivity. The proposed MX/CS/PB/GCE has been proven to monitor H2O2 in food samples and biological samples with recoveries between 94.7% and 100.3%. This work has made a beneficial attempt and research for exploring and expanding the application of MXs in the field of electrochemical sensing.
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Nano Research
·
2021
·Vol. 14
·期 8
·2875-2883
·
IF 8.897
Xu Xiaowen,Chen Yucheng,He Pei,Wang Song,Ling Kai,Liu Longhui,Lei Pengfei,Huang Xianjun,Zhao Hu,Cao Jianyun,Yang Junliang
Strain sensors with good stability are vital to the development of wearable healthcare monitoring systems. However, the design of strain sensor with both duration stability and environmental stability is still a challenge. In this work, we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube (CNT) and Ti 3 C 2 T x MXene into polydimethylsiloxane (PDMS) matrix. The composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin, while the CNT/MXene sensing layer exhibits a resistance sensitive to strain. This sensor shows reliable responses at different frequencies and with long-term cycling durability (over 1,000 cycles). Meanwhile, the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water washing. The results demonstrate less than 10% resistance changes as the temperature rises from −20 to 80 °C or after sonication in water for 120 min, respectively. The composite sensor is applied to monitor human joint motions, such as bending of finger, wrist and elbow. Moreover, the simultaneous monitoring of the electrocardiogram (ECG) signal and joint movement while riding a sports bicycle is demonstrated, enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Chen Gu,Wenqiang Weng,Cong Lu,Peng Tan,Yao Jiang,Qiang Zhang,Xiaoqin Liu,Linbing Sun
MXenes have attracted increasing research enthusiasm owing to their unique physical and chemical properties. Although MXenes exhibit exciting potential in cations adsorption due to their unique surface groups, the adsorption capacity is limited by the low specific surface area and undeveloped porosity. Our work aims at enhancing the adsorption performance of a well-known MXene, Ti 3 C 2 T x , for methylene blue (MB) by decorating tiny ZIF-8 nanoparticles in the interlayer. After the incorporation of ZIF-8, suitable interspace in the layers resulting from the distribution of tiny ZIF-8 appears. When employing in MB, the adsorption capacity of composites can reach up to 107 mg·g −1 while both ZIF-8 (3 mg·g −1 ) and Ti 3 C 2 T x (9 mg·g −1 ) show nearly no adsorption capacity. The adsorption mechanism was explored, and the good adsorption capacity is caused by the synergistic effect of ZIF-8 and Ti 3 C 2 T x , for neither of them is of suitable interspace or surface groups for MB adsorption. Our work might pave the way for constructing functional materials based on the introduction of nanoparticles into layered materials for various adsorption applications.
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