COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yuanhao Ning,Minglong Yang,Zongbin Zhao,Xianxian Sun,Shuang Yang,Shasha Wang,Lei Liang,Yuanjing Cheng,Weilong Yin,Ye Yuan,Yibin Li
Transition metal carbides/nitrides (MXenes) with superb electrical properties have excellent applications for electromagnetic wave absorption (EMA). Whereas, the three-dimensional (3D) MXene's fabrication assemblies with anisotropic EMA performance are still a challenge as MXene nanosheets have weak gelation capabilities. In this study, graphene oxide was introduced to assist in fabricating the 3D MXene/RGO porous foam through the method of unidirectional freeze casting followed by hydrazine hydrate chemical reduction. Combined with the excellent electrical properties of MXene and RGO , the resultant lightweight (∼6 mg/cm 3 ) MXene/RGO composite foam (MGF) with a free-standing configuration exhibits anisotropic microwave absorption performance. At the sample thickness of 5 mm, MGF-1/2 shows −26.79 dB minimum reflection loss at 4.39 GHz along the perpendicular direction that relates to the unidirectional freeze casting direction. While along the parallel direction, materials with 3 mm thickness reach the maximum effective bandwidth of 8.34 GHz. The lightweight MXene/RGO nanocomposite foam with anisotropic performance may significantly extend the feasibility of MXenes in EMA.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 21
·25952-25962
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IF 2.478
Wang Yafei,Liang Luyang,Du Ziran,Wang Yaming,Liu Chuntai,Shen Changyu
Environment friendly electromagnetic interference (EMI) shielding materials with excellent EMI-shielding efficiency (SE) are urgently required to deal with the increasing electromagnetic wave and environmental pollution. In this work, biodegradable poly(lactic acid) (PLA)/carbon nanotubes (CNTs)/Ti 3 C 2 T x MXene nanocomposites are prepared via co-coagulation and compression molding techniques. The distribution state of Ti 3 C 2 T x MXene or CNTs, the excellent conductivity and EMI-shielding properties of the nanocomposites are confirmed by scanning electron microscopy (SEM), four-probe conductivity tester and vector network analyzer, respectively. The PLA/CNTs/Ti 3 C 2 T x nanocomposites show efficient EMI SE of 24.4 dB for 7 wt% CNTs/8 wt% Ti 3 C 2 T x at the thickness of 0.5 mm. By increasing the thickness of the film, the EMI SE of PLA/CNTs/Ti 3 C 2 T x nanocomposites can be increased to 39.6 dB at 1.9 mm, nearly 99.989% of electromagnetic wave is shielded. The EM wave reflection is the main shielding mechanism of the PLA/CNTs/Ti 3 C 2 T x nanocomposites. Considering future environmental issues, this work provides a novel way for fabricating MXene-based biodegradable EMI shielding materials.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 10
·2000343
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IF 3.853
Qingsen Gao,Mingjie Feng,En Li,Chuntai Liu,Changyu Shen,Xianhu Liu
In this work, a novel nanocomposite is prepared via a melt blending of thermoplastic polyurethane (TPU) and Ti 3 C 2 T x MXene nanosheets pretreated with polyethylene glycol. It is found that the tensile strength and elongation at break increased by 41.2% and 15.4% at MXene loading values of 0.5 wt%. The addition of MXene slightly increases the crystalline speed of TPU, and effectively hinders the transfer of small gas molecules at high temperatures. The storage modulus, loss modulus, and complex viscosity of TPU nanocomposites increase with the increasing MXene content at low frequency. The results demonstrate that the mechanical, thermal, and rheological properties of TPU nanocomposites can be effectively improved by MXene nanomaterials.
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ACS Nano
·
2020
·
IF 14.588
Zixing Wang,Zhong Xu,Haichao Huang,Xiang Chu,Yanting Xie,Da Xiong,Cheng Yan,Haibo Zhao,Haitao Zhang,Weiqing Yang
Rich chemistry and surface functionalization provide MXenes enhanced electrochemical activity yet severely exacerbate their self-discharge behavior in supercapacitors. However, this self-discharge behavior and its related mechanism are still remaining issues. Herein, we propose a chemically interface-tailored regulation strategy to successfully unravel and efficiently alleviate the self-discharge behavior of Ti3C2Tx MXene-based supercapacitors. As a result, Ti3C2Tx MXenes with fewer F elements (∼0.65 atom %) show a positive self-discharge rate decline of ∼20% in comparison with MXenes with higher F elements (∼8.09 atom %). Such decline of the F elements can highly increase tight-bonding ions corresponding to an individual self-discharge process, naturally resulting in a dramatic 50% increase of the transition potential (VT). Therefore, the mixed self-discharge rate from both tight-bonding (contain fewer F elements) and loose-bonding ions (contain more F elements) is accordingly lowered. Through chemically interface-tailored engineering, the significantly changed average oxidation state and local coordination information on MXene affected the interaction of ion counterparts, which was evidently revealed by X-ray absorption fine structures. Theoretically, this greatly improved self-discharge performance was proven to be from higher adsorption energy between the interface of the electrode and the electrolyte by density functional theory. Therefore, this chemically interface-tailored regulation strategy can guide the design of high-performance MXene-based supercapacitors with low self-discharge behavior and will promote its wider commercial applications.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaohui Sun,Xueying Zhao,Xuyang Zhang,Guohua Wu,Xianhui Rong,Xiangwei Wang
Ti3C2Tx MXene is a potential microwave absorption material due to its unique physical and chemical properties. However, the impedance mismatch of MXene results in low microwave absorption. In this work, 2D/2D MXene@TiO2 composites were synthesized via a simple hydrothermal oxidation method, TiO2 is derived in situ from MXene without adding any additional Ti precursors. TiO2 with low permittivity can effectively regulate the impedance matching and enhance loss mechanisms. The MXene@TiO2-6 h composite shows a reflection loss (RL) of −58.3 dB at 11.36 GHz with a thickness of 1.75 mm, and the maximum effective absorption bandwidth (EAB) is 4.08 GHz (13.92–18 GHz) at 1.26 mm. Furthermore, the 2D/2D composite can obtain efficient microwave absorption at different frequencies by adjusting the thickness; RL can reach −39.1 dB at 5.04 GHz with a thickness of 3.5 mm. The radar cross section (RCS) of MXene@TiO2-6 h is lower than −19 dB m2 at −60–60°, and the minimum RCS is −56 dB m2 at 15°. This work provides a valuable experience in developing microwave absorption materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xin Li,Jiale Liu,Guocan Jiang,Xinyu Lin,Jin Wang,Zhengquan Li
Aerogels, especially MXene aerogels, are an ideal multifunctional platform for developing efficient photocatalysts for CO 2 reduction because they are featured by abundant catalytic sites, high electrical conductivity, high gas absorption ability and self-supported structure. However, the pristine MXene aerogel has almost no ability to utilize light, which requires additional photosensitizers to assist it in achieving efficient light harvesting. Herein, we immobilized colloidal CsPbBr 3 nanocrystals (NCs) onto the self-supported Ti 3 C 2 T x (where T x represents surface terminations such as fluorine, oxygen, and hydroxyl groups) MXene aerogels for photocatalytic CO 2 reduction. The resultant CsPbBr 3 /Ti 3 C 2 T x MXene aerogels exhibit a remarkable photocatalytic activity toward CO 2 reduction with total electron consumption rate of 112.6 μmol g -1 h - 1 , which is 6.6-fold higher than that of the pristine CsPbBr 3 NC powders. The improvement of the photocatalytic performance is presumably attributed to the strong light absorption, effective charge separation and CO 2 adsorption in the CsPbBr 3 /Ti 3 C 2 T x MXene aerogels. This work presents an effective perovskite-based photocatalyst in aerogel form and opens a new avenue for their solar-to-fuel conversions.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Guinan Chen,Jiahao Li,Nanjun Li,Chenglong Guo,Peng Jin,Liangjun Chen,Yongwu Peng
Thermal bimorph actuators have important applications in artificial muscles, switches, and microsensors for robotics and biomimetic devices. To broaden the adaptability of environments, it is essential to fabricate thermal actuators with multiple stimulus responses, including electricity, near-infrared (NIR) light, and ultraviolet (UV) light, with fast and large deformations . Herein, a thermal actuator with programmable stimuli response was designed by combining silver nanowires (AgNWs) with Ti 3 C 2 T x MXene . Due to the synergistic effect of AgNWs with high plasmonic properties and electrical conductivity as well as Ti 3 C 2 T x MXene with good flexibility and photothermal properties, the obtained actuator can roll up for 2200° at a low driving voltage (2 V) and shows a fast response speed of 0.4 s for a bending angle of 360° under NIR light. More remarkably, the obtained thermal actuator can curl 360° in 1.2s under UV light which has never been reported before. We believe that such thermal actuators are attractive for a wide range of innovative technologies involving soft-bodied robots, intelligent grippers, bionic worms, and information cryptography.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ruiting Liu,Miao Miao,Yahui Li,Jianfeng Zhang,Shaomei Cao,Xin Feng
Lightweight, ultrathin, and flexible electromagnetic interference (EMI) shielding materials with high electromagnetic shielding effectiveness (SE) and excellent mechanical robustness are greatly desired for miniaturized and highly integrated electronics. Herein, for the first time, a freestanding, ultrathin, and flexible Ti3C2Tx/poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) composite film with a “brick-and-mortar” structure is biomimetically designed and fabricated via a vacuum-assisted filtration process. The ultrathin polymeric composite film with a weight ratio 7:1 of Ti3C2Tx to PEDOT:PSS is only 11.1 μm in thickness but exhibits a high EMI SE value of 42.10 dB. Meanwhile, the tensile strength increases considerably from 5.62 to 13.71 MPa and the corresponding ruptured strain increases from 0.18 to 0.29% compared with pure Ti3C2Tx MXene film, respectively. Moreover, the hybrid film displays a superior conductivity of 340.5 S/cm and an outstanding specific EMI shielding efficiency of 19 497.8 dB cm2 g–1. The superior electrical conductivity and specific EMI shielding efficiency imply the excellent potential of the Ti3C2Tx/PEDOT:PSS composite films for ultrathin, lightweight, and flexible EMI shielding materials.
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ACS Nano
·
2025
·
IF 16
Zhiyi Wu,Jiahui Shen,Zimu Li,Shuang Liu,Yuxuan Zhou,Kai Feng,Binbin Zhang,Shiqi Zhao,Di Xue,Jiari He,Kewei Yu,Jinpan Zhang,Graham Dawson,Qingfeng Zhang,Lizhen Huang,Chaoran Li,Xingda An,Lifeng Chi,Xiaohong Zhang,Le He
The ever-growing interest in MXenes has been driven by their distinct electrical, thermal, mechanical, and optical properties. In this context, further revealing their physicochemical attributes remains the key frontier of MXene materials. Herein, we report the anisotropic localized surface plasmon resonance (LSPR) features in Ti3C2Tx MXene as well as site-selective photocatalysis enabled by the photophysical anisotropy. Both experimental and theoretical studies provide direct evidence of the occurrence of transverse and longitudinal dipolar plasmon resonance modes, respectively, driven by in-plane and out-of-plane vibrations of the two-dimensional (2D) MXene nanoflakes. Wavelength-controlled excitation of the two LSPR modes is demonstrated to activate either the on-edge or the in-plane active sites for plasmonic charge carrier-induced site-selective catalysis. Our findings uncover the presence as well as the mechanism of the anisotropic plasmon resonance in nonmetallic 2D nanomaterials and provide intriguing design principles for next-generation plasmonic nanocatalysts.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Junzhi Li,Yanan Li,Haiyu Luo,Lili Tang,Nan Xu,Wenlan Ji,Shihao Zhang,Pei Nian,Yibin Wei
Construction of well-confined sub-nanochannels for molecular-sieving in organic solvent environment remains a challenge for organic solvent nanofiltration (OSN) membranes in precise fluid separation. Herein, cyclodextrin (CD) cross-linked 2D Ti 3 C 2 T x MXene membranes with laminar nanostructure containing unique sub-nanoscale mass transfer channels for unprecedented OSN performance is reported. Density-functional theory (DFT) calculation and experimental results confirm that CD monomers (α-, β-, γ-) with 3D intrinsic cavity structures are anchored with Ti 3 C 2 T x MXene nanosheets forming a stable polyester cross-linking network via an interfacial molecular engineering using trimesoyl chloride (TMC). The prepared membranes exhibit ultrahigh OSN performance with excellent stability in organic solvents. The optimal membrane can effectively reject dyes such as methylene blue (99.8%), rhodamine B (98.0%), and Congo Red (100%), while having high ethanol permeability ranging from 22.58 to 85.31 L/(m 2 h bar). Remarkably, the membrane structure remained intact after 4 weeks immersion in ethanol and acetone. This work provides a facile and reliable strategy to construct a high-performance 2D material-based OSN membrane with well-confined mass transfer channels.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Haiyu Luo,Junzhi Li,Lili Tang,Yanan Li,Nan Xu,Wenlan Ji,Pei Nian,Shihao Zhang,Yibin Wei
Photocatalytic technology with high oxidative activity has been considered promising for eliminating fouling of nanofiltration (NF) membranes when used in organic pollutant removal. Herein, we report a photocatalytic self-cleaning NF membrane composed by two dimensional Ti 3 C 2 T x MXene and NaTaO 3 nanoparticles with excellent permeability and antibiotics removal efficiency. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used to verify the successful preparation of the photocatalytic self-cleaning membrane. The membrane with the NaTaO 3 nanoparticles loading of 8 mg (NM-8) exhibited excellent rejection (>99.67%) and water permeability (90.79–112.50 L m −2 h −1 ·bar −1 ) for tetracycline hydrochloride (TC), ciprofloxacin (CIP), methylene blue (MB), and 2-mercaptobenzothiazole (MBT). The removal efficiencies of the membrane for TC, CIP, MB, and MBT during the photocatalytic degradation process were 75.18%, 70.13%, 90.04% and 93.12%, respectively. Moreover, the chemical and optical properties were investigated by zeta potential, water contact angle, and UV–vis spectrum. The mechanism of photodegradation of pollutants by the prepared NaTaO 3 @Ti 3 C 2 T x MXene membranes was further elucidated. This work not only deepens the construction of photocatalytic NF membranes using two dimensional materials, but also provides a new strategy for the efficient removal of antibiotics from wastewater.
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LANGMUIR
·
2025
·
IF 3.9
Longhui Dai,Huimin Yu,Yunkai Wang,Xuyang Zhang,Fang Xu,Xiaofang Pan,Jing-Ting Luo,Aihua Zhong
MXenes have attracted tremendous attention in electromagnetic interference shielding, energy storage, and gas and humidity detections because of their ultralarge surface area and abundant functional groups. However, their poor stability against hydration and oxidation makes them challenging for long-term storage and applications. Herein, we proposed and demonstrated a Ti3C2Tx MXene composite-based humidity sensor, of which the stability is pronouncedly enhanced by introducing an O2 adsorption competitor of extracted bentonite (EB). All the results of TEM, XPS, and Raman spectroscopy show that the oxidation of the Ti3C2Tx MXene is significantly suppressed by the introduction of EB. Its excellent performance in humidity detection further confirms the effectiveness of EB in improving the stability. An ultrahigh response value of 6400% and an ultrafast response time of 1 s at 85% RH are observed, suggesting promising prospects for superior humidity detection of the Ti3C2Tx MXene composite. Furthermore, its feasibility for flexible humidity detection was also examined on a PET substrate, which exhibited high flexibility and excellent discrimination in speaking words.
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