ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chenxu Liu,Yanan Ma,Yimei Xie,Junjie Zou,Han Wu,Shaohui Peng,Wei Qian,Daping He,Xin Zhang,Bao-Wen Li,Ce-Wen Nan
High-efficiency electromagnetic interference (EMI) shielding and heat dissipation synergy materials with flexible, robust, and environmental stability are urgently demanded in next-generation integration electronic devices. In this work, we report the lamellar MXene/Aramid nanofiber (ANF) composite films, which establish a nacre-like structure for EMI shielding and heat dissipation by using the intermittent filtration strategy. The MXene/ANF composite film filled with 50 wt % MXene demonstrates enhanced mechanical properties with a strength of 230.5 MPa, an elongation at break of 6.2%, and a toughness of 11.8 MJ·m3 (50 wt % MXene). These remarkable properties are attributed to the hydrogen bonding and highly oriented structure. Furthermore, due to the formation of the MXene conductive network, the MXene/ANF composite film shows an outstanding conductivity of 624.6 S/cm, an EMI shielding effectiveness (EMI SE) of 44.0 dB, and a superior specific SE value (SSE/t) of 18847.6 dB·cm2/g, which is better than the vacuum filtration film. Moreover, the MXene/ANF composite film also shows a great thermal conductivity of 0.43 W/m·K. The multifunctional MXene/ANF composite films with high-performance EMI shielding, heat dissipation, and joule heating show great potential in the field of aerospace, military, microelectronics, microcircuit, and smart wearable electronics.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 3
·1026-1043
·
IF 4.5
Chen Sen,Shi Qianru,Liu Hui
As a typical two-dimensional MXene material with abundant oxygen-containing functional groups, Ti 3 C 2 could be used as an excellent carrier for noble metal nanoparticles to effectively avoid its agglomeration. However, Ti 3 C 2 was easily oxidized and deteriorated when stored in a conventional environment, so polydopamine (PDA) was used to modify Ti 3 C 2 to promote uniform loading of noble metal nanoparticles. Based on this, with Ti 3 AlC 2 as the raw material and PDA as the modifier, in situ growth of gold nanoparticles was carried out using chloroauric acid trihydrate as the precursor, and the target nanocomposite catalyst (Au@P-Ti 3 C 2 ) was then obtained. A sequence of characterizations were employed to analyze chemical structure of the resulting catalyst. The catalytic degradation performances of Au@P-Ti 3 C 2 toward amaranth, methylene blue, chrome black T, and Congo red were systematically investigated, and the results showed that catalytic degradation percentage of Au@P-Ti 3 C 2 for the above dyes could reach 100%. The pseudo-first-order kinetic model could be used to simulate the catalytic reaction process well, and catalytic reaction rate constants of Au@P-Ti 3 C 2 (2) for the four pollutants were 0.0411 s −1 , 0.0721 s −1 , 0.0273 s −1 , and 0.0105 s −1 , respectively. After 10 cycles of repeated catalysis, catalytic degradation percentage of the composite catalyst toward the four dyes could still remain above 89%. Therefore, this novel, green, and simple method to synthesize Ti 3 C 2 -based composite catalyst might provide extremely valuable application prospect for MXene-based catalyst in the field of harmless treatment of industrial dyes. Graphical Abstract
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-11
·
IF 6.408
Wang Jing,Xu Wei,Zhou Lin,Zhang Tianqi,Yang Na,Wang Min,Luo Xuemei,Jin Lu,Zhu Huaijun,Ge Weihong
The peroxidase-like activity of MXene@Fe 3 O 4 nanocomposites and the relevant colorimetric application have been investigated for the first time. According to a kinetic study, MXene@Fe 3 O 4 nanocomposites displayed higher peroxidase activity than their individual components, and the catalytic process followed a ping-pong mechanism. The improved peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was obtained due to the synergetic impact of the Fe 3 O 4 and MXene phases, the huge ion-accessible interface, and quick electron transfer channels in the nanocomposites. In the presence of hydrogen peroxide (H 2 O 2 ), the MXene@Fe 3 O 4 nanocomposites can catalyze the reaction of the colorless substrate 3, 3, 5, 5-tetramethylbenzidine (TMB) into oxidized TMB which revealed a blue color at 652 nm. After the introduction of glutathione (GSH), the blue color was gradually fading owing to the hydroxyl radical scavenging effect of glutathione. A colorimetric detection platform based on the peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was developed for H 2 O 2 and GSH with a detection limit of 0.4 μM and 0.5 μM, respectively. The calibration plot for glutathione detection is calculated by absorbance difference at 652 nm, which ranged from 0.5 to 10 μM with a detection limit of 0.2 μM. The recoveries of GSH with different concentrations ranged from 93.76 to 108.50% and the relative standard deviation from 0.30 to 5.96%. This work significantly extends the application of MXene@Fe 3 O 4 nanocomposites in the construction of colorimetric sensors and reveals a satisfactory result in real sample analysis. Graphical Abstract
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Ubaid Khan,Bowen Gao,Ling Bing Kong,Zhong Chen,Wenxiu Que
The electrochemical properties of carbides and nitrides dominated two dimensional MXenes can be effectively engineered for a wide variety of applications. Herein, we report a hydrothermal Alkali etching process to prepare Ti 3 C 2 T x @Al-NaOH (T x = -OH, -O) MXene without fluorine from Sodium hydroxide (NaOH) and MAX solution. The T i3 C 2 T x @Al-NaOH sample etched for 15 h in NaOH solution exhibits optimal electrochemical properties. Also, the T i3 C 2 T x @Al-NaOH samples, which have NaOH concentrations of 22.5, 25, 30, 35 and 40 M, respectively, show higher rates of charge-discharge and pseudocapacitive effect in 1 M sulfuric acid electrolyte solution, while the corresponding specific capacity values are 378, 445, 565, 365 and 176 Cg −1 , respectively. Meanwhile, their retention rates are still retained at 94 %, 119 %, 150 %, 113 % and 29 %, after continuous cycling of about 8000 times. It is demonstrated that the Ti 3 C 2 T X @Al-NaOH (30 M) for 15 h shows great potential as a candidate electrode for supercapacitors and other energy storage devices, since its capacitance value surpasses (by ∼465 %) to that of the multilayer Ti 3 C 2 T x MXene prepared via normal hydrofluoric acid etching. As a consequence, our Alkali-assisted hydrothermal reaction treatment is a highly advantageous process to realize fine-tune of surface chemistry.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Mingyu Ye,Qing Yin,Yankun Lin,Hongbing Jia
Film electrodes assembled with MXene have attracted excellent attention for applications in flexible energy storage systems. However, the poor mechanical performance and restricted capacitive surface are limiting factors for the development of high-performance MXene-based supercapacitor . Herein, a MXene-based film electrode with the remarkable integration of mechanical and capacitive properties was provided by using aramid nanofibers/reduced graphene oxide (ANFs/rGO) as reinforcing filler, which achieved 7- and 17-times improvements in tensile strength and toughness, respectively, compared with pure MXene film. Due to the careful regulation of the lamellar structure by introducing ANFs/rGO, the composite film electrode showed a superb volumetric capacitance of 349.2 F cm −3 at a current density of 1 A cm −3 . Moreover, a solid-state supercapacitor based on the composite film delivered a maximum energy density of 15.5 mWh cm −3 at a power density of 0.47 W cm −3 . The optimal structure-function relationship realized in this work validates the feasibility of optimizing MXene film electrode by ANFs/rGO.
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高影响因子
CARBON
·
2023
·
IF 10.9
Yongjun Zhou,Yuanya Zhang,Jing Wang,Yu He,Junya Yuan,Xuehu Men
Epoxy resin (EP) composites are attracting intensive interest for aviation aircraft applications due to superior machinability and high corrosion resistance . However, the poor tribological performance of EP matrix greatly limits its wide application because of highly brittle and weak thermal properties. Herein, we constructed a vine-like MXene@MoS 2 /Carbon nanofiber aerogel (MMoCA) via directed freezing method and cellulose carbonization treatment. The obtained MMoCA exhibited long-range-aligned 3D porous lamellar structure and the MXene@MoS 2 attached to carbon nanofiber surface presented good dispersion inside the aerogel. Such a novel aerogel bestowed the EP composites with outstanding thermal properties through constructing continuous oriented thermal diffusion channels inside the EP matrix. Meanwhile MMoCA reinforced EP composites (MMoCA-EP) showed great potential in tribological application, resulting from the rapid friction heat dissipation and high-quality transfer films during the friction process . This study has a significant guidance to develop high performance polymer composites in the frontier field of tribology .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zeyi Wang,Xuejie Zou,Zhiwei Yang,Jian Wang,Qian Chen,Chengjie Pei,Zhiwei Wang,Mengwei Dong,Jian Zhang,Hai Li,Xiao Huang
Wearable temperature sensors with high sensitivity and stability hold great potential for human health monitoring. However, hydrogels, which are commonly used for wearable devices, often show poor thermal and electrical conductivity and are susceptible to dehydration and freezing. Herein, we developed a frost- and dehydration-resistive temperature sensor based on Fe2+/Ti2CTx/κ-carrageenan (CA)-polyacrylamide (PAM) hydrogel. The Fe2+ ions within the hydrogel existed in two forms: as free ions and bonded ions. The free Fe2+ ions could complex with water molecules, resulting in the improved resistance to dehydration and freezing, as well as enhanced ionic conductivity in the hydrogel. On the other hand, the remaining Fe2+ ions acted as linkers to form coordination bonds with the sulfate groups of CA chains, resulting in the greatly enhanced mechanical strength of the hydrogel. In addition, the Ti2CTx nanosheet-based fillers formed a well-defined porous laminar structure, which reduced the phonon scattering and improved the phonon adsorption within the hydrogel. The Fe2+/Ti2CTx/CA-PAM hydrogel sensor exhibited excellent temperature sensing performance including a good linearity (R2 = 0.998) within a broad working range (−10 to 60 °C), high resolution (0.1 °C), and good repeatability. Furthermore, the sensor was integrated into a wireless system for continuous monitoring of body temperature, demonstrating its potential in healthcare monitoring, electronic skins, and intelligent robots.
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Peiying Xie,Chunzhi Zhang,Mingxing Li,Qiao You,Ying Yuan,Shunjian Qiu,Zhiming Wang,Li Zhou,Yunhua Chen,Hongxia Liu
Pickering emulsion , an emulsion prepared by replacing conventional surfactants with solid particles, has been extensively used to construct a variety of functional materials especially 3D porous foams or aerogels . Ti 3 C 2 T x MXene have recently garnered tremendous attention and considered as a promising candidate for the construction of functional nanomaterials due to their fascinating properties. However, it remains a challenge to construct MXene-based composite porous materials. Herein, the Pickering emulsion co-stabilized by multiple kinds of particles and the subsequent MXene-based multifunctional composite foam were studied. The formation mechanism of Pickering emulsions stabilized by cellulose nanofibrils (CNF), nickel nanowires (Ni NW), and Ti 3 C 2 T x MXene was investigated along with their stabilization mechanism in a complex water-oil environment. The final Pickering emulsions exhibited excellent stability over a wide pH range (5−11) and ionic strength (0–400 mM). Further, the CNF/MXene/Ni (CMN) composite foam was prepared by freeze-drying the emulsion gel. The as-prepared foam exhibited a minimum reflection loss of −30.2 dB at 2.8 GHz frequency. Moreover, the foam also exhibited promising photothermal conversion behavior, maintaining a temperature of up to approximately 80.9 °C for 200 s of exposure to 1 Sun. Therefore, this work affords a new and universal method to prepare MXene-based multifunctional porous materials for their potential applications in many areas.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 15
·3791-3800
·
IF 2.7
Tong Jinling,Yang Dongxu,Liu Xingmin,Lu Shaowei,Wang Jijie,Zheng Boxiong,Zhao Zihan,Song Yutong
Lightweight flexible composite films are widely used in the field of smart and wearable devices due to efficient electromagnetic interference (EMI) shielding effectiveness in the wide frequency domain and excellent mechanical properties. Herein, the CNTs@MXene composite films with excellent mechanical properties and EMI effectiveness were prepared by electrophoretic deposition method on carbon nanotubes (CNTs) substrate. By optimizing the experimental parameters, the optimal deposition time was determined to be 15 min. Meanwhile, the mechanical properties of the 40 μm composite films were the best and the tensile strength reached about 29.2 MPa. Moreover, the composite films with the same thickness showed excellent electromagnetic shielding effects of 69.02 dB and 77.32 dB in X-band and P-band, respectively. The CNTs@MXene composite films showed excellent EMI shielding effectiveness and mechanical properties. Therefore, the composite films showed great advantages and potentials in the application of smart and wearable devices. Graphical abstract
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yun Zhou,Junqiang Yang,Ningyuan Zhou,Huaixin Hao,Xuan Jiang,Fuan Lei,Keliang Shi,Yanhong Zhao,Gen Zhou,Tonghuan Liu,Shan Xing
The treatment of radioactive wastewater is crucial to ensure the safe and rapid development of nuclear energy. However, efficient disposal of uranium wastewater containing high concentrations of fluoride ions (F − ) generated during uranium enrichment and conversion poses a formidable and pressing challenge. In this study, we successfully synthesized MXene/PAO hydrogel beads (MPH beads) by self-assembling two-dimensional Ti 3 C 2 T x MXene nanosheets with amidoxime through ionic cross-linking. MPH beads exhibited exceptional uranium adsorption capacity (625 mg/g), remarkable adsorption selectivity , and good reusability. Notably, MPH beads demonstrated a maximum uranium adsorption capacity of 400 mg/g in an aqueous solution containing 8000 ppm F − . Furthermore, MPH beads showed favorable F − resistance and were able to remove>95% of U(Ⅵ) even after being immersed in an extreme environment for 15 days. Additionally, MPH beads achieved a high U(Ⅵ) recovery of 98.2% from real environment water samples using dynamic column experiments, showcasing their excellent application performance. The efficient U(Ⅵ) adsorption and anti-fluoride effect were mainly attributed to the combined complexation between the C(NH 2 ) = N-OH, C-Ti-OH groups and U(Ⅵ), as demonstrated by experiments, characterization, and DFT calculations. Our study highlights the significant potential of MPH beads in the treatment of uranium from radioactive wastewater , especially wastewater with high concentrations of F − .
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Jiasheng Wei,Lei Dai,Ping He,Meng Zhu,Feng Jiang,Zhaoxiang Zhou,Guiqiang Fei,Tingzhou Lei
MXene-contained paper is a good choice to design ultrathin and flexible electromagnetic interference (EMI) shielding materials. However, the deficiencies in strength and stability of MXene-contained paper impede its practical applications. Herein, a composite paper was proposed to address the problems, in which a filter paper was modified with a three-layer structured surface via a facile layer-by-layer coating procedure. Specifically, the TEMPO-oxidized cellulose nanofibers (TOCN)/cationic starch (CS)/MXene gel layer and TOCN/MXene nacre structure layer ensured the good EMI shielding and mechanical performances of the composite paper, while the uppermost TOCN/CS hydrogel film layer mainly protected MXene. The composite paper achieved an EMI SE of 40.3 dB at a thickness of merely 0.1894 mm (SE/ t value of ca. 212.8 dB mm −1 , SSE/ t values of ca.13216 dB cm 2 g − 1 ) and the total MXene dosage was 20 g m − 2 . Its tensile strength could be up to 11.7 MPa while the original filter paper was 6.4 MPa. Four pieces of this composite papers could be easily packed together to attain an EMI SE of nearly 70 dB. Importantly, the hydrogel film layer efficiently protected the MXene and maintained the EMI shielding performance of the composite paper when immersed in different liquids including water, HCl (1 M) and ethanol, due to the dense and compact structure of hydrogel film layer. This work provides a practical way to develop ultrathin, flexible and durable EMI shielding materials.
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