Advanced Electronic Materials
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2019
·Vol. 6
·期 1
·1900493
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IF 6.312
Huiwu Mao,Chen Gu,Shiqi Yan,Qian Xin,Shuai Cheng,Peng Tan,Xiangjing Wang,Fei Xiu,Xiaoqin Liu,Juqing Liu,Wei Huang,Linbing Sun
Low-dimensional MXene materials including MXene quantum dots (MQDs) and nanosheets have attracted extensive attention owing to their unique structures and novel properties, but their most attractive features are still less explored than expected. A systematic study of the memory effects of MQD-based electronics is reported. Monodisperse MQDs are prepared by using a one-step facile hydrothermal synthetic method. By varying the MQD content in polyvinylpyrrolidone (PVP) hybrid composite films, the electrical conductance of an indium tin oxide (ITO)/MQD-PVP/gold (Au) sandwich structure can be tuned precisely from insulator behavior to irreversible resistive switching, reversible resistive switching, and conductor behavior. These irreversible and reversible resistive switches are capable of exhibiting write-once-read-many times (WORM) and flash memory effects, respectively. Both types of devices operate stably under retention testing, with a high on/off current ratio up to 100. The tunable memory and transient features of these hybrid films are likely due to MQD charge trapping due to their quantum confinement and dissolvability of memristive components. The results suggest that MXene nanomaterials are promising as resistive switching trigger for emerging nonvolatile memories for data storage, specially data storage security.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 17
·48621
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IF 2.188
Zhuwu Yi,Jian Yang,Xiaochao Liu,Long Mao,Lingna Cui,Yuejun Liu
MXene modified by stearic acid (Ti 3 C 2 T x -g- SA) is incorporated into poly(lactic acid) (PLA) matrix to prepare Ti 3 C 2 T x -g- SA/PLA composites. The effects of Ti 3 C 2 T x -g- SA to pure PLA are investigated, including crystallization, mechanical, and thermal properties. Fourier transform infrared spectroscopy and X-ray diffraction analyses confirm that Ti 3 C 2 T x interlayer is successfully intercalated by SA, and the interlayer spacing of Ti 3 C 2 T x is increased. Differential scanning calorimetry illustrates that the cold crystallization enthalpy (Δ H cc ), melting enthalpy (Δ H m ), and crystallinity ( X c ) of Ti 3 C 2 T x -g- SA/PLA composites are improved by the plasticization and heterogeneous nucleation effect of Ti 3 C 2 T x -g- SA. Specially, the Ti 3 C 2 T x -g- SA/PLA composites exhibit excellent mechanical properties at an appropriate content of the Ti 3 C 2 T x -g- SA. Compared with pure PLA, the elongation at break of the Ti 3 C 2 T x -g- SA/PLA composite is increased 5.9-fold (up to 131.6%) when only containing 0.5 wt % Ti 3 C 2 T x -g- SA. Besides, the Ti 3 C 2 T x -g- SA/PLA composites exhibit good thermal stability in the low loading (lower than 1 wt %) of Ti 3 C 2 T x -g- SA. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48621.
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JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Yining Wang,Jingwen Sun,Xingyue Qian,Yue Zhang,Lei Yu,Richao Niu,Hongan Zhao,Junwu Zhu
Nickel molybdate is emerged as a promising electrode material in supercapacitors for its rich redox chemistry . However, its limited electrical and ionic conductivities keep it from achieving its full capacitance potential. Here, a facile pathway is reported to synthesize NiMoO 4 /Ti 3 C 2 T x nanosheets with interconnected porous construction, which may promote the electrolyte ion diffusion during reversible insertion/deinsertion processes, further improve its capacity. The fabricated NiMoO 4 /Ti 3 C 2 T x electrode exhibits a high specific capacity of 545.5 C g −1 (1364 F g −1 ) at a current density of 0.5 A g −1 alongside with attractive cycling stability, contributed to the strong synergistic effects between NiMoO 4 and Ti 3 C 2 T x . Furthermore, an asymmetric supercapacitor is fabricated by coupling NiMoO 4 /Ti 3 C 2 T x positive electrode with reduced graphene oxide hydrogel negative electrode , which demonstrates a broad potential window of 1.6 V, and an energy density of 33.76 W h kg −1 .
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 11
·6475-6481
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IF 10.733
Ruiyi Han,Peiyi Wu
Separation membrane with laminar structure, assembled by two-dimensional materials, has been widely explored to achieve precise molecular separation and high water permeability in the field of water purification. Herein, a novel GO-based nanofiltration membrane intercalated with TiO2 nanoparticles was fabricated by the in situ oxidation of MXene nanosheets. The formation of TiO2 nanocrystals, derived from the oxidation of MXene, created additional channels for water permeation. Particularly, the consecutively distributed TiO2 nanocrystals acted as intercalators owing to their laminar structure and created continuous nanochannels within GO membrane for water transport, which shows great advantages over the membrane prepared using traditional methods. Water permeability of the obtained membrane reached 89.6 L m−2 h−1 bar−1, which is 7.3 times that of pristine GO membrane and 2.4 times that of GO/TiO2 membrane fabricated using traditional methods. The rejection rate for four different organic dyes is above 97%. The highly improved water permeability with no obvious sacrifice of rejection rate was attributed to the presence of continuous nanochannels obtained via the in situ oxidation of MXene without destroying the intrinsic stacking structure of GO sheets. This study offers a novel strategy to fabricate continuous nanochannels within the separation membrane with a two-dimensional laminar structure.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Peiyao Lin,Jun Shen,Xiaohui Yu,Qinqin Liu,Dongsheng Li,Hua Tang
construction of the Schottky-junction is considered to be a valid route to boost the spatial charge separation and transfer of the photocatalytic system. Herein, two-dimensional (2D) O-doped g-C 3 N 4 nanosheets were prepared by an annealing route, and then a 2D/2D Ti 3 C 2 MXene/O-doped g-C 3 N 4 Schottky-junction was fabricated using an in-situ electrostatic assembly of negatively charged Ti 3 C 2 MXene and positively charged O-doped g-C 3 N 4 nanosheets. The as-prepared Ti 3 C 2 MXene/O-doped g-C 3 N 4 Schottky-junction exhibited almost two times enhanced hydrogen evolution (25124 μmol/g/h) in comparison to pristine O-doped g-C 3 N 4 (13745 μmol/g/h) and Ti 3 C 2 MXene/pristine C 3 N 4 (15573 μmol/g/h). Based on fully characterizations and theory calculation, the enhanced photocatalytic performance could be attributed to the synergy effect of intimate 2D/2D interfacial contact and the construction of Schottky-junction, which result in the short charge transport distance from HCN to Ti 3 C 2 MXene and efficient separation of the photo-generated charge. This study will provide new insight into developing 2D/2D Schottky-junction photocatalysts for the solution of the energy crisis.
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Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
·
IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xinliang Li,Xiaowei Yin,Hailong Xu,Meikang Han,Minghang Li,Shuang Liang,Laifei Cheng,Litong Zhang
Two-dimensional (2D) few-layered Ti3C2TX MXene (f-Ti3C2TX) has been proved to be one of the most promising electromagnetic interference (EMI) materials, but its electromagnetic (EM) absorption properties and loss mechanism have not been studied so far. Herein, for the first time, ordered lamellar f-Ti3C2TX/SiCnws hybrid foams with ultralow density are synthesized by a combination of self-assembly and bidirectional freezing processes. The freestanding foams exhibit excellent EM absorption properties superior to most of the current foam-based counterparts. The effective absorption bandwidth is always able to cover the whole X-band, when the sample thicknesses of f-Ti3C2TX/SiCnws hybrid foams distribute in any value between 3.5 and 3.8 mm, and the minimum reflection coefficient reaches −55.7 dB at an ultralow density of only about 0.029 g·cm–3. The fundamental mechanism associated with optimized impedance matching, enhanced polarization loss, and conductive loss is discussed in detail. Our results evidence that 2D flexible f-Ti3C2TX MXene has great potential in EM absorption field like graphene.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Fanyu Kong,Xiaodong He,Qianqian Liu,Xinxin Qi,Yongting Zheng,Rongguo Wang,Yuelei Bai
The presented work compared the etching behavior between combustion synthesized Ti 3 AlC 2 (SHS-Ti 3 AlC 2 ) and pressureless synthesized Ti 3 AlC 2 (PLS-Ti 3 AlC 2 ). Because the former had a more compact structure, it was harder to be etched than PLS-Ti 3 AlC 2 under the same conditions. When served as anode material for Li-ion batteries, SHS-Ti 3 C 2 showed much lower capacity than PLS-Ti 3 C 2 at 1 C (52.7 and 87.4 mAh g −1 , respectively) due to the smaller d -spacing. Furthermore, Potentiostatic Intermittent Titration Technique (PITT) was used to determine the Li-ion chemical diffusion coefficient ( D Li + ) of Ti 3 C 2 in the range of 10 −10 − 10 −9 cm 2 s −1 , indicating that Ti 3 C 2 could exhibit an excellent diffusion mobility for Li-ion.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yilin Liu,Wenzhao Geng,Linan Wang,Hailong Wang,Rui Zhang,Di Lan,Bingbing Fan
With the rapid advancement of wearable electronic devices in both civilian and military applications, electromagnetic (EM) pollution has become a growing concern, leading to an increased demand for efficient electromagnetic wave (EMW) absorbing materials. Conventional absorbing materials often suffer from limited design flexibility and challenging processing requirements. To address these issues, this study introduces a series of MXene/Polyacrylamide hydrogels (MPH) with excellent EMW absorption properties, fabricated into complex geometric structures using digital light processing (DLP) printing technology. These functional hydrogels feature a three-dimensional (3D) porous architecture, providing robust mechanical properties and exceptional EMW absorption performance. The MXene component, enriched with surface functional groups, not only improves impedance matching but also synergistically interacts with other dissipation mechanisms to enhance overall EMW absorption. Notably, the MPH-1 specimen demonstrates an outstanding effective absorption bandwidth (EAB) of 7.36 GHz at a thickness of 1.95 mm (10.64–18 GHz), and a minimum reflection loss (RL min ) of −38.20 dB at 10.88 GHz at a thickness of 2.40 mm. This work presents a novel and efficient strategy for the rapid and precise fabrication of gel-based functional materials, offering a straightforward method for developing wearable, flexible EMW-absorbing devices with superior properties.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chengjie Bai,Siran Jia,Wei Chen,Lulu Li,Yu Zhang,Peng Min,Zhong-Zhen Yu,Hao-Bin Zhang
Miniaturized and wearable electronic products require electromagnetic interference shielding (EMI) materials with sensing functions to cope with complex application situations. Herein, an effective dual-network structure is designed to fabricate two-dimensional transition metal carbides and nitrides/bacterial cellulose-thermoplastic polyurethane (MXene/BC-TPU) foams with intriguing EMI shielding property and piezoelectric sensing ability under both compressive and tensile strains. Anisotropic MXene/BC aerogels, as conductive networks, with impressive conductivity (1912 S m–1), ultrahigh EMI shielding effectiveness (SE) of 86 dB, and absolute SE up to 63,608 dB cm2 g–1 can be built by directional freezing. Interpenetrated neuro-like TPU network is embedded into the MXene/BC aerogels by controllable coagulation to provide elasticity. Inheriting the elastic TPU network, the light weight MXene/BC-TPU foams show superb elasticity and remarkable fatigue resistance suffering both compressive and tensile strains with a wide strain range (−80–80%). Meanwhile, benefiting from the separated conductive MXene/BC network and the elastic TPU network, the MXene/BC-TPU foams display an outstanding EMI SE (76 dB) with an EMI SE retention of 86.8% after 5000 compression–release cycles and an EMI SE retention of 69.7% after 100 stretch–release cycles, respectively. Furthermore, the MXene/BC-TPU foams reveal stable resistance signal output as piezoresistive sensors in a wide strain range of −80–80%. The highly conductive, stretchable, and compressible MXene/BC-TPU foams are suitable as EMI shielding and motion monitoring materials for wearable electronics.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Fangfang Liu,Mengnan Lu,Xiao Yang,Yuedi Wang,Chunmei Wang,Xiaomin Dou
This work proposed introducing nanoscale Fe-Zr oxides onto the layered-surfaces of MXene carriers to maintain well dispersion and anchoring stabilization. The results indicated that Fe-Zr oxide/MXene has a superior adsorption capacity of 209.1 mg/g at pH 7.0. The mass transfer of antimonite onto Fe-Zr oxide/MXene was investigated by numerical solving the homogeneous surface diffusion model. The external mass transfer coefficient ( k f ) and surface diffusion coefficient ( D S ) were determined to be 6.48 × 10 −4 and 1.86 × 10 −8 cm/min, respectively, and the latter was rate-limited. The 2-D profiles of Sb(III) diffusion within the adsorbents were visualized. Data mining and knowledge discovery using machine learning models indicated that the gradient boosting regression (GBR) model successfully predicted the test datasets. The operational conditions outweigh adsorbent properties in capacity prediction, and equilibrium concentration and adsorbent dose, are the most two important features. Using the trained GBR model, the Sb(III) adsorption capacities of MXene (Ti 3 C 2 ) and Fe-Zr/MXene were well predicted. This work provides insights on understanding the mass transfer mechanisms of Sb(III) in functionalized-MXene adsorbents and employing machine learning models for tuning the treatments for better achievements.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2024
·
IF 5.4
Panyong Wang,Qiannan You,Yulu Liu,Huimin Miao,Wen-Fei Dong,Li Li
The growing resistance of bacteria to antibiotics has posed challenges in treating associated bacterial infections, while the development of multi-model antibacterial strategies could efficient sterilization to prevent drug resistance. High-entropy MXene has emerged as a promising candidate for antibacterial synergy with inherent photothermal and photodynamic properties. Herein, a high-entropy nanomaterial of MXene/CDs was synthesized to amplify oxidative stress under near-infrared laser irradiation. Well-exfoliated MXene nanosheets have proven to show an excellent photothermal effect for sterilization. The incorporation of CDs could provide photo-generated electrons for MXene nanosheets to generate ROS, meanwhile reducing the recombination of electron-hole pairs to further accelerate the generation of photo-generated electrons. The MXene/CDs material demonstrates outstanding synergistic photothermal and photodynamic effects, possesses excellent biocompatibility and successfully eliminates drug-resistant bacteria as well as inhibits biofilm formation. While attaining a remarkable killing efficiency of up to 99.99% against drug-resistant Escherichia coli and Staphylococcus aureus , it also demonstrates outstanding antibacterial effects against four additional bacterial strains. This work not only establishes a synthesis precedent for preparing high-entropy MXene materials with CDs but also provides a potential approach for addressing the issue of drug-resistant bacterial infections.
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