ACS Applied Nano Materials
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2023
·
IF 5.9
Jingxuan Cui,Jiao Wu,Le Mi,Aihu Feng,Yang Yu,Yun Yu
Ti3C2Tx MXene is expected to achieve infrared stealth by regulating its thermal radiation properties. In this study, Ti3C2Tx MXene films were prepared by using the acid etching method, and the effects of etchants (HCl/LiF, HF, and NH4HF2) on the film structure as well as the infrared radiation properties were systematically studied. The intercalation process used to exfoliate single/few-layer nanosheets was found to accelerate the oxidation and increase the resistance of MXene. The mechanism behind these effects on emissivity was explained in detail. Based on these findings, the most suitable preparation process for low-emissivity MXene was selected. The resulting Ti3C2Tx film (HL-f), which used HCl/LiF as an etchant for Ti3AlC2, has a high conductivity of 3119 S/cm that reflects numerous infrared waves reaching its surface while exhibiting a low emissivity of only 0.13. The colloidal solution (HL-s) made with HCl/LiF as an etchant was sprayed directly onto a PI substrate as a coating with infrared stealth capabilities, thermal stability, and Joule heating properties, reducing the emissivity from 0.87 to 0.14. This work provides guidance for improving MXene preparation methods and their applications in related fields while demonstrating the great potential of HCl/LiF-etched Ti3C2Tx MXene as a low-emissivity infrared stealth material.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Junhai Wang,Yu Kan,Tingting Yan,Wenfeng Liang,Lixiu Zhang,Xinran Li,Siyang Gao
Progress in nanolubricant additive is crucial to pursuit of energy saving and sustainable development. For enhancing lubrication efficiency of pentaerythritol ester (PETE) oil, we synthesized zero-dimensional/two-dimensional (0D/2D) carbon dots(CD)@Ti3C2Tx-MXene hybrid composites using a facial hydrothermal method, which gave full play to interlayer shear mechanism of Ti3C2Tx-MXene, repair effect of carbon dots and their potential synergy. The composites were added to PETE as lubricating additives, during which ultrasonic treatment was employed to enhance the dispersion stability. The frictional tests confirmed that the addition of CD@Ti3C2Tx resulted in significant reductions in friction and wear across varying temperatures owing to the ultrasmall size, interlayer sliding, and synergistic effect. The optimal concentration of 0.1 wt % of CD@Ti3C2Tx reduced friction coefficients and wear volumes of PETE by 54.5% and 57.6% at 25 °C, 53.3% and 54.3% at 100 °C, and 40.0% and 45.9% at 200 °C, respectively. A tribofilm induced by complex tribochemical reactions, mainly consisting of carbon dots, Ti3C2Tx, metal oxides, carbides, and nitrides, was generated at the contact interface, which significantly alleviated direct contact between the rubbing pair. This study explores the potential of CD@Ti3C2Tx for development of advanced lubricating materials and is expected to contribute to wider adoption of MXene-based materials in the field of tribology.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Luyuan Yang,Yitao Yang,Xin Dai,Ying Zhao,Dawei Han,Qi Zuo,Zhaozheng Song
Membrane separation has been widely used in the treatment of oily wastewater, but traditional membrane materials are easily polluted, and it is difficult to overcome the trade-off effects between water flux and retention rate. Recently, 2D MXene materials with adjustive microstructures and abundant surface functional groups have been used to fabricate functional composite membranes. In this work, the CNTs-TiO 2 -Ti 3 C 2 T x composite materials were suction filtrated on a support (nylon membrane) to construct the laminated composite membrane. The layer spacing was controlled by adjusting the mass ratio of carbon nanotubes (CNTs), and the crosslinking reaction of polydopamine (PDA) and polyethyleneimine (PEI) was used to modify the membranes synergistically. The CNTs-TiO 2 -Ti 3 C 2 T x (CTT) membrane had superhydrophilic and underwater superoleophobic characteristics as well as high efficiency in oil/water emulsion separation. CTT membranes exhibited a high separation effect ( > 99.9%) for various emulsified oils. Compared to the TiO 2 -Ti 3 C 2 T x (TT) membrane (211.62 L m −2 h −2 bar −1 ), the pure water flux of the composite membrane (CTT-1) displayed high permeation flux over 4432.13 L m −2 h −2 bar −1 . Moreover, the CTT membrane exhibits fouling resistance and stable water flux even after ten testing cycles. Therefore, CTT composite membranes with flexible layer spacing overcome the trade-off effects and have tremendous potential in practical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yufei Wang,Yue Wang,Gaofei Pan,Jian Huo,Ruiguang Xing,Xin Ge
Owing to the rapid development of information and electronic technologies, it is urgent to design and prepare new materials with electromagnetic interference (SEI) shielding function to reduce electromagnetic pollution. Herein, a thin magnetic Ti 3 C 2 T x MXene (MMX) nanocomposite film with excellent EMI shielding performance was obtained by combining Ti 3 C 2 T x MXene nanosheets with porous magnetic microspheres (PMMs). The lamellar structure of Ti 3 C 2 T x MXene nanosheets provides flexibility to the MMX nanocomposite film, enabling it to bend and deform in a flat plane. Furthermore, PMMs possess magnetic and dielectric properties, enhancing the attenuation ability of the MMX nanocomposite film to electromagnetic wave energy. The rough surface of PMM can improve the electromagnetic wave consumption through multiple reflection and enhance the performance of Ti 3 C 2 T x MXene EMI shielding nanocomposites. MMX nanocomposite exhibits excellent EMI shielding performance (SE T : 66.9 dB, SSEt: 5251 dB cm 2 g −1 ). We anticipate that this flexible nanocomposite film with excellent EMI shielding effect will be widely used in different fields.
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CARBON
·
2023
·
IF 10.9
Shuai Zhang,Ying Huang,Jiaming Wang,Xiaopeng Han,Guozheng Zhang,Xu Sun
Flexible energy storage systems and electromagnetic pollution have become issues that need to be resolved in equipment research and development due to the widespread use of portable electronic devices and 5G networks . MXene is competent for supercapacitors and electromagnetic wave absorbers through sensible composite and microstructure design. Herein, Cu 1.5 Mn 1.5 O 4 Hollow Nanosphere Decorated Ti 3 C 2 T x MXene (CuMnHS@MX) was prepared by simple electrostatic self-assembly. Hybrid membranes can be quickly prepared by vacuum-assisted filtration. CuMnHS@MX exhibits excellent electromagnetic wave absorption performance and electrochemical energy storage properties. High specific capacitance (2089 mF/cm 2 at 2.5 mA/cm 2 ) and excellent cycle stability (99.89% after 8000 cycles) are achieved, which are attributed to the increased interlayer spacing and improved interlayer ion transport efficiency. When assembled into symmetrical flexible all-solid-state supercapacitor (SC), the device has a specific capacitance of 382.9 mF/cm 2 and an energy density of 53.18 μWh/cm 2 at a power density of 277.8 μW/cm 2 . Meanwhile, CuMnHS@MX has advantageous absorbing properties. When the thickness is 4 mm, the minimum reflection loss (RL min ) is −53.42 dB at 6.08 GHz. Adjustable absorbing property is achieved, and the absorbing energy efficiency can cover X and most C, Ku bands . These excellent EMA properties are derived from the 3D structure and rich dipole/interface polarization. CuMnHS@MX is a promising bifunctional material for electrochemical energy storage and electromagnetic wave absorption.
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SYNTHETIC METALS
·
2022
·
IF 4
Yanhua Lei,Mengchao Ding,Haikun Wu,Di Yin,Yang Li,Bochen Jiang,Kai Sun,Yuliang Zhang,Hailiang Du
In this work, the layered Ti 3 C 2 T x MXene were coated with polypyrrole particles by an in-situ polymerization method, and their electromagnetic wave absorption performance were systematically studied. The MXene/PPy composites presented an excellent electromagnetic wave absorption performance, the strongest reflection loss can reach − 68 dB at 2.68 mm. Meanwhile, when the thickness is 2.26 mm, the effective absorption bandwidth can reach 6.56 GHz (from 11.44 to 18 GHz), covering the entire K u band (12–18 GHz). The multiple reflections at the heterogeneous interface, and the synergistic effect between the layered MXene and the conductive polypyrrole network made a combined effect on the optimized absorption. The MXene/PPy composites with a strong electromagnetic wave absorption, wide effective absorption bandwidth and corrosion resistance have a great value in aircraft and vessel fields.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Guangzhen Cui,Xin Zheng,Xuliang Lv,Qi Jia,Wei Xie,Guangxin Gu
MXene materials with efficient electromagnetic (EM) microwave absorber applications are in high demand. Herein, the EM wave absorption properties of two-dimensional MXene Ti 3 C 2 T x , fabricated by etching the Ti 3 AlC 2 phase with an enchant of HCl and LiF, was thoroughly investigated over a frequency range of 2–18 GHz. In addition, the impact of three critical factors (reactant concentration, reaction time, and reaction temperature) on the morphology control and dielectric properties was discussed. With increasing degree of exfoliation, the multilayer structure of Ti 3 C 2 T x changed gradually, thereby further influencing the microwave absorption properties. Among the etched samples, Ti 3 C 2 T x prepared with 9 M HCl at 35 °C for 24 h exhibited an excellent reflection loss of −40.8 dB at 13.9 GHz with a thickness of 1.45 mm, while also possessed the broadest effective bandwidth, reaching 3.66 GHz at 1.68 mm. The demonstrated EM wave response mechanism, indicated that the conduction loss and polarization loss contribute significantly to the EM wave absorption performance. These findings endow the Ti 3 C 2 T x material with an effective foundation for the construction of novel EM wave absorbers.
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WEAR
·
2025
·
IF 6.1
Sudesh Singh,Tianyi Han,Xinchun Chen,Chenhui Zhang
Although MXene and MoS 2 individually possess outstanding anti-friction and wear-resistant properties in numerous applications, the combination of both in the recent past has created a new frontier in cutting-edge applications. The current work insights into the impregnation of porous alumina ceramics in the MXene (1 wt %), MoS 2 (1 wt %), and hybrid (0.5 wt % MXene +0.5 wt % MoS 2 ) solution to fabricate self-lubricating alumina composites via vacuum impregnation method and afterward exploring the mechanical as well as tribological properties of the synthesized composites. A significant strengthening of the matrix for impregnated composites was observed compared to unimpregnated porous ceramics. The impregnated composites were slid against the zirconia ball to assess the friction behavior. The results revealed that the ceramics impregnated with MXene only can reduce COF by ∼43 % of that unimpregnated ceramics; however, in conjunction with MoS 2, the reduction can be lowered to ∼70 % attributed to synergistic effect of MXene and MoS 2 to form the tribo-layer over interacting surfaces. The study concludes that hybrid (MXene/MoS 2 ) impregnation of porous ceramics exhibits excellent self-lubricating properties over other impregnations, making them suitable candidates for advanced tribological applications. This novel combination leverages the unique properties of MXene and MoS 2 to enhance the longevity and performance of porous ceramics in demanding operational environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yanxiang Liu,Yuanlin Li,Yu-Ting Xu,Hai Xu,Yu Gao,Xiao-Feng Wang,Ritsuko Fujii,Shin-ichi Sasaki
Developing efficient heterojunction photocatalysts with improved light-harvesting capacity and high charge carrier separation rates for photocatalytic hydrogen production remains a challenge in the field of energy conversion. In this study, we synthesized two-dimensional Ti 3 C 2 T x nanosheets through HF etching of Ti 3 AlC 2 and combined them with carotenoid dyes ( Car ) with different structural characteristics using a solvent spontaneous volatilization method to construct novel Car @Ti 3 C 2 T x Schottky heterojunctions. The intimate interface contacts between the two-dimensional Ti 3 C 2 T x MXene and Car enhanced the light-harvesting capacity of the photocatalysts and promoted charge separation rates. The optimal sample, Car-3 @Ti 3 C 2 T x nanocomposite, exhibited excellent photocatalytic activity of 84.4 µmol h −1 g −1 for H 2 production under visible light illumination. This work demonstrates the potential of earth-abundant organic Car dyes in constructing high-efficiency and low-cost photocatalysts for hydrogen production .
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liming Yao,Liwei Qian,Wenqi Song,Sufeng Zhang,Yuhao Zhang,Lijing Zhang,Xikuan Li,Guangqi Yan,Valentin Nica
Two-dimensional (2D) transition metal carbides (Ti3C2Tx MXene) have demonstrated substantial application potential across various fields, owing to their excellent metallic conductivity and solution processability. However, the rapid oxidation of Ti3C2Tx in aqueous environments, leading to a loss of stability within mere days, poses a significant obstacle for its practical applications. Herein, we introduce an antioxidant strategy that combines free radical scavenging with surface passivation, culminating in the design and synthesis of imidazolium-based ionic liquids (ILs) incorporating siloxane groups. By deploying a straightforward hydrolysis-addition reaction, we successfully fabricated IL-modified Ti3C2Tx materials (Ti3C2Tx-IL). The Ti3C2Tx -IL not only displayed exceptional conductivity exceeding 3.85 × 104 S/m and hydrophilic contact angles below 45° but also showcased its superior chemical stability and antioxidation mechanisms through various analyses, including visual color change experiments, spectroscopic and energy spectrum characterization, free radical scavenging tests, and density-functional-theory-based molecular simulations. Furthermore, when utilized as a conductive filler in the fabrication of a poly(vinyl alcohol)/nanocellulose fiber (PVA/CNF) composite hydrogel (PCMIL), the resultant sensors exhibited remarkable mechanical performance with up to 535% strain, 1.59 MPa strength, 4.35 MJ/m3 toughness, and a conductivity of 3.40 mS/cm, as well as a high sensitivity gauge factor of 3.3. Importantly, even after 45 days of storage, the PCMIL retained most of its functionalities, demonstrating superior performance in human-machine interaction applications compared to hydrogels made from unmodified Ti3C2Tx. This research establishes a robust antioxidant protection strategy for Ti3C2Tx, offering substantial technical reinforcement for its prospective applications in the realm of flexible electronics and sensing technologies.
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Materials Today Chemistry
·
2024
·
IF 6.7
Xiangjun Li,Rongtao Wu,Yuxin Shi,Shijie Ding,Miaomiao Li,Shiwei Xu,Bing Zhang,Libo Tong,Qingjuan Wang
The anti-corrosion/anti-wear advantages of Ti 3 C 2 T x MXenes are limited in environmentally friendly water-based resins due to their instability in aqueous environments and poor compatibility with polymers. In this study, a dual-functional waterborne polyurethane (WPU)/Ti 3 C 2 T x MXene hybrid coating with excellent corrosion resistance and wear resistance is designed. This strategy uses dopamine-grafted Ti 3 C 2 T x MXene sheets to enhance the dispersibility and compatibility of Ti 3 C 2 T x MXene nanosheets in WPU through covalent and hydrogen bonds and can alleviate the oxidation of Ti 3 C 2 T x MXene in aqueous solution. In 3.5 wt% NaCl solution, PMXene and WPU composite (WPU@PMXene) coating has the lowest corrosion current density of 7.73 × 10 −8 A cm −2 and the highest polarization resistance of 1.22 × 10 7 Ω cm 2 , which is better than that of bare Mg alloys 3 orders of magnitude. The |Z| f = 0.01Hz value of WPU@PMXene coating is 3 orders of magnitude higher than that of pure WPU coating. In addition, the wear rate of WPU@PMXene coating is reduced from 2.93 × 10 −3 mm 3 /(N·m) of pure WPU to 0.9 × 10 −3 mm 3 /(N·m) (reduced by 3 times). The improved performance is due to the “labyrinth effect” and increased compatibility of dopamine modified Ti 3 C 2 T x MXene. This synergistic effect exploits a novel and convenient approach of expanding the application of Ti 3 C 2 T x MXene in aqueous coatings to enhance corrosion and wear resistance.
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Nanomaterials
·
2024
·Vol. 14
·期 22
·1835
·
IF 4.4
Chong Li,Ran Tao,Jinqiao Hou,Huanming Wang,Chen Fu,Jingting Luo
Ammonia (NH 3 ) gas is prevalent in industrial production as a health hazardous gas. Consequently, it is essential to develop a straightforward, reliable, and stable NH 3 sensor capable of operating at room temperature. This paper presents an innovative approach to modifying SnO 2 colloidal quantum dots (CQDs) on the surface of Ti 3 C 2 T x MXene to form a heterojunction, which introduces a significant number of adsorption sites and enhances the response of the sensor. Zero-dimensional (0D) SnO 2 quantum dots and two-dimensional (2D) Ti 3 C 2 T x MXene were prepared by solvothermal and in situ etching methods, respectively. The impact of the mass ratio between two materials on the performance was assessed. The sensor based on 12 wt% Ti 3 C 2 T x MXene/SnO 2 composites demonstrates excellent performance in terms of sensitivity and response/recovery speed. Upon exposure to 50 ppm NH 3 , the frequency shift in the sensor is −1140 Hz, which is 5.6 times larger than that of pure Ti 3 C 2 T x MXene and 2.8 times higher than that of SnO 2 CQDs. The response/recovery time of the sensor for 10 ppm NH 3 was 36/54 s, respectively. The sensor exhibited a theoretical detection limit of 73 ppb and good repeatability. Furthermore, a stable sensing performance can be maintained after 30 days. The enhanced sensor performance can be attributed to the abundant active sites provided by the accumulation/depletion layer in the Ti 3 C 2 T x /SnO 2 heterojunction, which facilitates the adsorption of oxygen molecules. This work promotes the gas sensing application of MXenes and provides a way to improve gas sensing performance.
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