ACS Applied Nano Materials
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2023
·
IF 5.9
Liangliang Xu,He Chen,Pingyu Zheng,Haowen Zheng,Zhong Chen,Zonglin Liu,Pengyang Li,Xu Zhao,Qingyu Peng,Xiaodong He
Two-dimensional transition-metal carbides and nitrides (MXenes) show great potential in aerogel flexible piezoresistive sensors owing to their versatile surface chemistry, high carrier mobility, outstanding metallic conductivity, and adjustable interlayer spacing under applied stress. However, the pure MXene aerogel exhibits significant plastic deformation or brittle mechanical performance due to the weak interactions between the nanosheets. Herein, a series of MXene/polyimide/silver nanowire composite aerogels with aligned lamellar microstructure are fabricated by bidirectional freezing and annealing strategies. The introduction of polyimide (PI) and silver nanowires (AgNWs) significantly improves the mechanical properties of the MXene-based aerogel. The obtained lightweight composite aerogel shows superelasticity with large reversible compressibility, excellent stability, and outstanding fatigue resistance. Moreover, owing to the highly aligned lamellar microstructure of the composite aerogel and the excellent conductivity of MXene and AgNWs, the composite aerogel exhibits great sensing performance with high sensitivity (gauge factor ∼27.8) and ultralow detection limit (<0.6 Pa). Based on the MXene/PI/AgNW composite aerogels, a series of wearable sensor applications are demonstrated.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yunxiu Liu,Yu Tian,Qiuyang Han,Jie Yin,Junchuan Zhang,Yue Yu,Weizhong Yang,Yi Deng
Because of the explosive generation of drug-fast bacteria, antibiotics-free strategy is much-needed for elimination of bacterial-associated contagion. Herein, we develop a near-infrared (NIR) activated heterostructure catalyst (MXene/CoNWs) consisted of two-dimensional (2D) MXene and one-dimensional (1D) cobalt nanowires (CoNWs) in acting against bacteria for drug-free therapy. The intercalated CoNWs can rapidly trap the photogenerated electrons from Ti 3 C 2 MXene nanosheets, thus restrains the recombination of hot electron-hole and facilitates transfer of carriers upon 808 nm NIR illumination, thereby increasing the yields of germicidal reactive oxygen species (ROS). Additionally, the photothermal effect of the 2D/1D heterostructure is significantly strengthened due to the synergy of plasmonic CoNWs and MXene semiconductor. The heterostructure coatings on an orthopedic implant can achieve a high antibacterial efficacy of over 90% against Gram-positive/Gram-negative bacteria within 20 min, resulting from the synergistic actions of NIR-triggered ROS and hyperthermia. Besides, in vitro findings indicate that MXene/CoNWs heterojunctions show acceptable cytocompatibility. Accordingly, the two merits make the novel MXene/CoNWs heterojunctions become a promising drug-free antibacterial therapy for cleaning the pathogenic infection and avoiding antibiotic resistance in practice.
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 11
·3672-3683
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IF 3.2
Min Zhang,Qili Yang,Kaiwen Liang,Lu Gao,Peng Lu,Cuicui Ding,Yuan Dang
The application of collagen-based hydrogel is severely restricted due to its poor mechanical strength and functional singleness. In this paper, two-dimensional MXene nanosheets were introduced into collagen/acrylic acid (AA) system, which was polymerized in situ to produce versatile hydrogel (GCol-MX-PAA). The tensile stress and compressive stress values of the resultant hydrogel at the MXene concentration of 5 mg/mL reached 211.5 kPa and 7.8 MPa, respectively, which were approximately 4.0 and 1.4 times higher than those of GCol-PAA. The bonding strength of the hydrogel reached 30.7 kPa in the porcine skin-adhesive model owing to the large number of free phenolic hydroxyl groups on GCol. Furthermore, GCol-MX-PAA could be applied to monitor large and subtle activities of human body due to the excellent electrical conductivity of MXene. Thanks to the outstanding photothermal conversion performance of MXene, the hydrogel could kill E. coli and S. aureus effectively under NIR irradiation. In addition, in vitro cytotoxicity test performed on L929 fibroblasts demonstrated the desirable biocompatibility of GCol-MX-PAA. The design strategy in this work gives guidance for the development of multifunctional collagen-based hydrogel in a wide range of applications. Highlights Versatile hydrogel constructed from GA-modified collagen, PAA, and MXene. The composite hydrogel displays improved mechanical properties. This hydrogel possesses superior tissue adhesion and strain sensitivity. This hydrogel shows desired photothermal antibacterial property and biocompatibility.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Yuanjin Wang,Yanjun Li,Qin Huang,Weijing Qi,Ruhao Zan,Min Gan,Zhenggang Rao,Linfeng Fei
MXene , an emerging two-dimensional material, has shown its evident application prospects in solar-driven interfacial water evaporation due to excellent photothermal conversion capability. However, MXene still suffers from a few undesirable characteristics in this scenario, including weak stability, self-stacking, and suboptimal optical absorption . To address these issues, in this paper, we fabricated a MXene-based composite aerogel , featuring with interconnected porous structure , broad and high solar absorption, good wettability and photothermal capacity. As our judicious structural and compositional design for the aerogel decreased the evaporation enthalpy of water, the solar steam generator based on the aerogel exhibited an outstanding water evaporation rate as high as 2.31 kg m −2 h −1 under one sun irradiation (and the corresponding solar-to-vapor conversion efficiency reached 90.8 %). Additionally, the aerogel was also designed with an excellent adsorption capacity for removal of heavy metal ions from water as well as a good antibacterial ability, which should be helpful in dealing with the complex working environments for solar steam generators. This work may shed light on the design and development of multifunctional solar steam generators toward practical and sustainable applications.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Tianjiao Han,Weidong Zhu,Tianran Wang,Mei Yang,Yuanbo Zhou,He Xi,Peng Zhong,Dazheng Chen,Jincheng Zhang,Chunfu Zhang,Yue Hao
Two-terminal, mechanically-stacked perovskite/silicon tandem solar cells offer a feasible way to achieve power conversion efficiencies (PCEs) of over 35%, provided that the state-of-the-art industrial silicon solar cells and perovskite solar cells (PSCs) are fully compatible with one another. Herein, two-terminal, mechanically-stacked perovskite/silicon tandem solar cells are developed by mechanically interconnecting semitransparent PSCs and TOPCon solar cells with a MXene interlayer. The semitransparent PSCs are made from wide-bandgap perovskite Cs 0.15 FA 0.65 MA 0.20 Pb(I 0.80 Br 0.20 ) 3 films. Furthermore, the co-additives KPF 6 and CH 3 NH 3 Cl(MACl) are employed to reduce grain boundaries and intragranular defects in the perovskite, boosting the PCE of the semitransparent PSCs to a record-high value of 20.96% under reverse scan (RS) through a reduction in non-radiative recombination probability. These optimized semitransparent PSCs are then employed in MXene-interconnected two-terminal, mechanically-stacked tandem solar cells. The enhanced interfacial carrier transportation, with minimal influence on light transmission, imparted by the MXene flakes allows the tandem solar cells to achieve a stabilized PCE of 29.65%. The tandem cells also exhibit acceptable operational stability and are able to retain ≈93% and 92% of their initial PCEs after 120 min of continuous illumination or storage in ambient air for 1000 h, respectively.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Hao-yu ZHANG,Gui-bin TIAN,Fu-ying WU,Zhen-dong YAO,Jia-guang ZHENG,Liu-ting ZHANG
Two-dimensional Mo 2 TiC 2 MXenematerial was synthesized by etching Mo 2 TiAlC 2 and then doped into MgH 2 to tailor its hydrogen storage performance. The initial hydrogen desorption temperature of the Mo 2 TiC 2 -doped MgH 2 was significantly reduced from 330 °C (pristine MgH 2 ) to 187 °C. Isothermal dehydrogenation analysis indicated that the MgH 2 +9 wt.% Mo 2 TiC 2 composite rapidly discharged 6.4 wt.% H 2 at 300 °C within 4 min. For hydrogenation, the dehydrogenated MgH 2 +9 wt.% Mo 2 TiC 2 uptook 6.5 wt.% H 2 at 175 °Cwithin 5 min. By calculation, the activation energy for MgH 2 +9 wt.% Mo 2 TiC 2 was calculated to be (135.6±1.9) kJ/mol for the desorption reaction and (46.1±0.2) kJ/mol for the absorption reaction. After 20 cycles, 1.0 wt.% H 2 was lost for the MgH 2 +9 wt.% Mo 2 TiC 2 composite. Microstructure analysis results showed that the presence of Mo in Mo 2 TiC 2 enhanced the thermal stability of MXene and reduced the amount of active Ti during cycling, leading to poorer catalytic effect of the catalyst compared to Ti 3 C 2 .
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Xianhong Zheng,Peng Wang,Binbin Ding,Jinhao Tang,Xinghua Hong,Zhi Liu,Wen Xia,Xiaoshuang Zhou,Zongqian Wang,Lihua Zou,Changlong Li
Stretchable electrical conductors hold great promise in the wearable electronic devices, such as flexible display and human-machine interface. Stable conductivity is vital for wearable devices to maintain their stable performance. However, the electrical resistance of most reported yarns dramatically increases when they are deformed. Herein, we propose a design for a coaxial-helix structure by wrapping the polyaniline/MXene-based elastic core-spun yarn on itself in the form of coils. The fabricated coaxial-helix structured yarns (DCSs) exhibit excellent strain-insensitive properties, including low relative resistance change (25.4%), large strain (200%) and high quality factor (17.95). Moreover, the DCSs can be used as the stretchable electrodes for the supercapacitors , and delivers a linear specific capacitance of 256.7 mF cm −1 , which is higher than most stretchable yarns. Therefore, the proposed coaxial-helix structure design creates a new approach for the strain-insensitive stretchable conductor, thereby paving the way for the development of stretchy electronics.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Sisheng Guo,Yuqi Zheng,Xinyue Zhang,Xinying Lei,Hongfei Sun,Tao Wen
MXenes materials are burgeoning candidates for advanced water purification . However, the self-restacking and surface passivation of MXenes severely hamper the utilization of their electronic properties and surface reactivity. Herein, we employed the strategy of carbon nanoplating stabilization of MXenes for not only effectively stabilizing the structure of MXenes but also providing nucleation growth of MnO 2 . The MXene@C@MnO 2 -activated PMS system was able to degrade ∼ 100% of bisphenol A (BPA) (20 mg/L) within 4 min with the turnover frequency (TOF) of 8.14 min −1 . Specifically, the generation of superoxide radicals by activation of peroxymonosulfate (PMS) through reversible redox cycling between Mn(IV) and Mn(III) cations was regarded as the crucial driver of BPA removal. The scale-up experiment in actual water bodies achieved more than 90% BPA removal at 1200-bed volumes with stable catalytic properties during 20 h continuous operation. This work offers a potential macroscopic MXene-based nanohybrids for advanced oxidation processes .
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高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 45
·期 4
·3460-3473
·
IF 5.2
Shuo Meng,Tong Zhao,Xiaosong Wang,Xiaolong Wang,Yuantao Zhang
Polyvinylidene fluoride (PVDF) has broad application prospects in the field of dielectric capacitors. However, the low dielectric constant of the polymer greatly limits the improvement of its energy storage density. In this paper, a highly conductive two-dimensional transition metal carbide (MXene) is utilized to modify PVDF by doping to prepare PVDF/MXene composite dielectrics, and a PVDF/MXene model is established based on molecular dynamics simulations to investigate the microscopic mechanism of improvement in the dielectric properties of the PVDF matrix upon doping. Finally, the effect of the MXene on the thermal conductivity and the mechanical and insulating properties of PVDF was investigated. The experimental results show that the relative dielectric constant of the PVDF/MXene-1.0 wt% system at 100 Hz reached 14.54, which is 55.96% higher than that of pure PVDF, and this doping amount or lower can reduce the dielectric loss of PVDF. In addition, MXene doping improved the mechanical and thermal properties of the composite material to a certain degree. When the doping amount of MXene was lower than 1.0 wt%, the electric breakdown strength of the composite system was maintained above 245 MV/m, which is sufficient to achieve good insulation strength under most conditions. Highlights The low dielectric constant of polymers limits the improvement of their energy storage density. The doping of polymers with small amounts of conductive fillers can effectively increase the dielectric constant of the polymer matrix. A two-dimensional nanomaterial MXene is used to improve the dielectric properties of PVDF matrix and the micromechanisms are analyzed by molecular dynamics simulations. The key properties of PVDF/MXene, such as the mechanical properties, thermal conductivity and insulation, are characterized.
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Crystals
·
2023
·Vol. 13
·期 8
·1234
·
IF 2.7
Zhiwei Liu,Zhaobo Liu,Guanlong Li,Yan Zhao,Kai Wang,Xiangbao Chen
At present, the rapid development of electronic devices such as batteries, sensors, capacitors and so on is creating a huge demand for lightweight materials with a designed structure and function. Ti3C2TxMXene, a lightweight two-dimensional (2D) nanomaterial with excellent electronic properties, has been favored in this field. In this work, Ti3C2TxMXene was annealed under an inert gas (N2, Ar and CO2) atmosphere to design the crystal structure and interface of the nanosheets, and then the modified nanosheets with specific changes in dielectric properties were obtained. Among them, the key temperature points (100 °C, 300 °C, 500 °C and 800 °C) in the thermogravimetric (TG) test under an air atmosphere were used as the annealing temperature. When annealing under an air atmosphere, with the increase in temperature, the Ti layer gradually oxidized and evaporated, and the original two-dimensional structure was partly destroyed with some of the C atoms reacting with O2to form CO2. In the inert gas atmosphere, however, the 2D structure is preserved, except that the surface end groups and layer spacing are changed. In addition, some N element doping was introduced into the nanosheets after N2atmosphere treatment, which changed the original lattice structure. After the Ar atmosphere treatment, some Ti atoms on the surface were oxidized in situ to form TiO2grains with different crystal forms, which increased the interfacial area. The C-TiO2structure of the nanosheets was more complete after treatment with the CO2atmosphere. All the nanosheets after heat treatment with an inert gas atmosphere retained the characteristic morphology of 2D materials, and different changes in the micro-structure caused changes in dielectric properties, thereby meeting the needs of 2D nanomaterials Ti3C2TxMXene in different scenarios.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 11
·2311637
·
IF 19
Xinyun Lin,Dekui Song,Tianci Shao,Ting Xue,Wenya Hu,Wenchao Jiang,Xiaoqin Zou,Nan Liu
For real-time care of metabolic diseases, it is highly demanded to simultaneously monitor metabolite content and diagnose muscle strength in a rapid and convenient way. However, such a biosensor with integrated functions of detecting chemical and biopotential signals at the same time has seldom been reported. In this work, a multifunctional biosensor, integrating the electrochemical detection of uric acid (UA) and glucose (Glu) in sweat, electrophysiological signal acquisition, and electrostimulation therapy, is designed. Hence, an electrophysiological MOF/MXene electrode is fabricated using highly conductive MXene and porous conductive metal–organic framework (c-MOF, Ni 3 (HITP) 2 ). Compared with commercial Ag/AgCl electrode, MOF/MXene electrode has lower electrode/skin interface impedance, higher stability and signal-to-noise (SNR). By utilizing the high charge storage capacity (CSC) of MOF/MXene electrode, it can realize muscle treatment by electrostimulation. Besides, with abundant active regions of c-MOF, the electrode exhibits excellent electrochemical performance in detecting sweat metabolites. Multimodal signals detected by such integrated biosensors are wirelessly transmitted to a mobile terminal, showing significant potential on muscle theranostics and daily non-invasive monitoring. Additionally, they offer timely nutritional guidance for individuals dealing with hyperuricemia or hyperglycemia.
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高影响因子
E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Jinbo Liu,Xuewei Tang,Xiaotong Chen,Guoqing Wang
The study of repairing materials is of paramount importance, considering that damage during usage can significantly impact performance and bring inconvenience during maintenance work. One highly sought-after material is water-swellable elastomers, known for their effect in sealing and repairing damaged materials. In this study, agar/polyurethane dual-network hydrogel elastomers were prepared, which were further modified by MXene. The material exhibits a uniform and flat surface, along with a rich pore-filled internal structure. It showcases excellent thermal stability, good tensile strength retention, and a controllable low swelling rate (SR) upon water absorption. The performance of the material can be regulated by the MXene content. In addition, the “water absorption–drying–water absorption” cycle effectively controls the reduction of the SR and gradually increases the tensile strength. All samples demonstrated exceptional photothermal conversion efficiency, stability, and durability, with the maximum conversion temperature increasing with the MXene content. The scratch repair experiments demonstrated the remarkable potential of these materials for photothermal conversion-assisted repair. These materials can be adapted as auxiliary restoration materials in water bodies and various application environments, making them ideal for repair and restoration purposes.
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