Nanoscale
·
2019
·Vol. 11
·期 30
·14123-14133
·
IF 6.97
Qingwen Guan,Junfei Ma,Wenjing Yang,Rui Zhang,Xiaojie Zhang,Xiaoxiao Dong,Yuting Fan,Lulu Cai,Yi Cao,Yilin Zhang,Neng Li,Quan Xu
Quantum dots, derived from two-dimensional (2D) materials, have shown promise in bioimaging, sensing and photothermal applications, and in white light emitting devices (WLEDs). Herein, nitrogen and phosphorus functionalized Ti3C2 MXene based quantum dots (N,P-MQDs) were successfully prepared through a top-bottom hydrothermal method. This type of photoluminescent quantum dots has realized green fluorescence for the first time at around 560 nm with a photoluminescence quantum yield (PLQY) of 20.1%, the highest ever reported; meanwhile, it also exhibits excellent photostability and pH resistance capacities. Comprehensive characterization and well-resolved density functional theory (DFT) calculation were implemented to determine the mechanism of fluorescence shift and enhancement. Furthermore, the N,P-MQDs have been proved to efficiently act as fluorescent probes for macrophage labeling. In addition, the high sensitivity of the N,P-MQDs toward Cu2+ ions made them a low cost, sensitive, environment-friendly, and label-free fluorescence platform for Cu2+ detection. The outstanding performance of Ti3C2 MXene based quantum dots has demonstrated their great potential to be used as promising fluorescent probes in the fields of biological imaging, optical sensing, photoelectric conversion, etc.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Haiyang Li,Xuanhe Ru,Ying Song,Huanping Wang,Chenhui Yang,Shuirong Zheng,Lei Gong,Xiaoguang Zhang,Hongji Duan,Zhenguo Liu,Qiuyu Zhang,Yanhui Chen
There is a pressing demand for efficient electromagnetic interference (EMI) shielding materials with strong electromagnetic wave absorption and low reflection for the protection of next-generation communication technologies and wearable electronic devices. In this work, silicone rubber/MXene/Fe3O4 (SRMF) composites with a sandwich-like structure were fabricated using vacuum-assisted dipping and curing. The top and bottom layers of the SRMF composites are magnetic layers containing Fe3O4 particles and silicone rubber (SR), while the middle layer is a 3D conductive network of MXene aerogel film and SR. This sandwich-like structure enables the composites to effectively shield incident electromagnetic waves and improve the absorption of electromagnetic waves through a mechanism of “absorption–reflection–reabsorption”. The electromagnetic shielding performance of a sandwich-structured SR composite containing 1.2 wt % MXene and 20 wt % Fe3O4 reached 55.5 dB, which was higher than that of a blended SRM1.2F20b composite containing the same proportion of MXene and Fe3O4 (23.1 dB), while the power coefficient of reflectivity was 0.65. The SRMF composites also retained their EMI shielding performance after 1000 bending cycles and displayed good tensile strength. These flexible SRMF composites have broad application prospects in the field of electromagnetic protection of wearable devices.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Qiang Liu,Junjie Yang,Xiaogang Luo,Yifei Miao,Yang Zhang,Wenting Xu,Lijun Yang,Yunxia Liang,Wei Weng,Meifang Zhu
As shining stars of 2-dimensional materials, transition metal carbides (MXene) and transition metal oxides have attracted much interest in various energy fields due to their excellent conductive and electrochemical properties . However, big challenge still remains in the accessibility of high-performance fibrous electrodes for flexible supercapacitors . In this paper, MnO 2 nanorods are loaded on MXene sheets to obtain MnO 2 @MXene composites by a facile hydrothermal method , which are subsequently coated on carbon nanotube fibers (CNTFs). With a fine control on morphology, the resulting MnO 2 @MXene/CNTF electrode exhibits a high specific capacitance of 181.8 F/g at 1 A/g, a capacitance retention of 91% after 5000 charge-discharge cycles, as well as superb flexibility, i.e., neglected capacitance loss at a bending angle of 180°. The as-fabricated flexible composite fiber opens a new door for transition metal carbides and transition metal oxides with great potential in flexible electronics.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Song Xu,Zhongxiao Zhao,Hao Jiang,Ting Chen,Ying Chen,Xianglong Zhao,Luyan Li,Bo Yang,Qiang Zhang
Direct methanol fuel cells show promise for portable electronic products, thanks to their considerable energy density and safety. However, their commercialization is hindered by challenges such as sluggish methanol oxidation reaction kinetics, high catalyst costs, and CO poisoning. This study addresses these issues by developing an oxygen vacancy-regulated MXene-supported PdSn bimetallic catalyst (PdSn/ V o -Ti 3 C 2 ) for efficient methanol oxidation reaction. The MXene support, engineered with controlled oxygen vacancies via electrodeposition, enhances electron transfer and distributes PdSn nanoparticles. The resulting PdSn/ V o -Ti 3 C 2 catalyst exhibits an outstanding electrochemical performance with mass activity of 1641 mA mg −1 , which is 3.6, 8.6, and 4.3 times as high as those of Pd/ V o -Ti 3 C 2 , Pd/Ti 3 C 2 and commercial Pd/C, respectively. Moreover, the prepared PdSn/ V o -Ti 3 C 2 catalyst also exhibits high stability. The work underscores the capability of defect engineering within MXene supports to disperse nanoparticles, which act as catalysts in direct methanol fuel cells.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yan Zhang,Lu Zhang,Chenxing Li,Jingxuan Han,Wenwei Huang,Jiayi Zhou,Yongqiang Yang
Dopamine (DA) detection is essential for diagnosis and evaluation of diseases such as Parkinson’s, Alzheimer and schizophrenia. However, conventional electrochemical sensors are vulnerable to biofouling in complex biological fluids, which leads to significant decrease in sensor performance. Ti 3 C 2 T x MXene, a novel 2D material with excellent conductivity and hydrophilicity, is a potential antifouling material for electrodes. But oxidation can strongly influence the performance of MXene. In this work, an antifouling electrochemical sensor for DA detection was fabricated by combining MXene and holey graphene (HG). Multilayer MXene (M−MXene) and single-layer MXene (S-MXene) were combined with HG to form a 3D porous network. HG not only prevented the restacking of MXene but it also improved the stability of MXene. Owing to the excellent conductivity and large surface area, S-MXene/HG modified electrode had a fast electron transfer and excellent electrocatalytic activity for DA compared with M−MXene/HG. Furthermore, S-MXene/HG possessed higher surface hydrophilicity and enhanced biofouling resistance than M−MXene/HG and HG modified electrode. S-MXene sensor displayed excellent analytical performance for DA and antifouling ability in complex fluids. It offers new promising possibilities for its clinical application.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-17
·
IF 9.043
Cao Wentao,Ma Chang,Tan Shuo,Ma Mingguo,Wan Pengbo,Chen Feng
An ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure was successfully fabricated via a facile alternating vacuum-assisted filtration process.
The composite paper exhibits excellent mechanical property and electromagnetic interference shielding performance.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Kaili Gong,Lian Yin,Haifeng Pan,Shaohua Mao,Lu Liu,Keqing Zhou
As a graphene-like material, MXene , represented by Ti 3 C 2 T x , has been found to possess promising flame retardant potential in polymers due to their excellent thermal and catalytic actions, as well as lamellar barrier effect. Thus, it is of great significance to explore whether MXene with double transition metal components has a higher flame retardant efficiency. Herein, Ti 3 C 2 T x and bimetallic MXene (Mo 2 Ti 2 C 3 T x ) were fabricated by acid-etching method and then introduced into epoxy resin (EP) for the comparative investigation of their flame-retardant effect. The results indicated that MXenes were homogeneously dispersed in EP matrix, which can contribute to the improvements of thermal and flame retardant properties of EP composites. Upon the incorporation of 1 wt% Mo 2 Ti 2 C 3 T x MXene, the EP composites achieved a significantly reduced maximum mass loss rate (R max ) by 39.4%, superb over EP/Ti 3 C 2 T x composites. Moreover, Mo 2 Ti 2 C 3 T x MXene endowed EP composites with a notable downward trend in fire risk, reflected by the decreasing PHRR of 34%, PSPR of 32.7%, TSP of 57.7%, PCO of 30.8%, along with significantly reduced SF value by 72.7%, which was superior to EP/Ti 3 C 2 T x composites. The strong catalytic attenuation and charring effect of transition metal Mo–Ti elements for bimetallic Mo 2 Ti 2 C 3 T x MXene, as well as nanosheet structure, imparted excellent fire retardant performance to EP composites. This work provides new insights into the application of bimetallic MXenes in flame retardant polymer composites .
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qindong Xie,Yi Zhao,Difei Liang,Linbo Zhang,Qiye Wen,Fu Tang,Min Hu,Longjiang Deng,Peiheng Zhou
MXene aerogels with a three-dimensional (3D) network structure have attracted increasing attention for lightweight electromagnetic wave absorbers. It is intriguing to expand their absorption band, i.e., to the booming terahertz (THz) region, and explore multifunctionality. Herein, we assemble MXene (Ti3C2Tx)-based hybrid aerogels into an aligned lamellar architecture using a bidirectional freezing technique. With air pore size and lamellar layer spacing comparable to THz wavelengths, high porosity of the aerogels allows nearly isotropic absorption of 99% and electromagnetic interference (EMI) shielding effectiveness with a remarkable value of 57.5 dB, in the ultrabroad bandwidth ranging from 0.5 to 3.0 THz. Simultaneous, strain-sensing response reflects the macroscopic anisotropy of the network structure of the aerogels. The improved sensitivity is measured for the out-of-lamellar layer plane under 0–30% strain. The corresponding long-term stability and durability persist over 120 stretching–releasing cycles. Our findings thus not only expand multiple functions of MXene in an anisotropic 3D macroscopic form but also clarify its nearly isotropic absorption in the THz band.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Ping Xiao,Guodong Zhu,Xiaohong Shang,Bin Hu,Boshuang Zhang,Zhaoyu Tang,Jianmao Yang,Jianyun Liu
The Fe-metal organic framework decorated MXene (Fe-MOF/MXene) was in-situ synthesized by one-step hydrothermal method in the presence of MXene. Using Fe-MOF/MXene as modifier, the obtained Fe-MOF/MXene electrode presented excellent electrochemical activity due to the high surface area and good conductivity of MXene. A sensitive arsenite electrochemical sensor was fabricated based on the strong As-hydroxyl bonding at the Fe-MOF/MXene electrode, confirmed by X-ray photoelectron spectroscopy. Cyclic voltammetry characterization indicated that MXene facilitated the charge transfer with enhanced electrochemical response. The Fe-MOF/MXene modified electrode exhibited super-high current response to As(III) by square wave anodic stripping voltammetry, with extremely high sensitivity (8.94 µA·(ng·L −1 ) −1 ·cm −2 ) and super-low limit of detection (0.58 ng·L −1 ). The analysis of the real water demonstrated that the Fe-MOF/MXene-based sensor was feasible for the detection of As(III) in practical application.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yitong Guo,Sen Jin,Libo Wang,Qixun Xia,Aiguo Zhou
In this paper, we report a novel method to rapidly prepare two-dimensional Mo 2 CT x MXene in a low-concentration etching solution. By this method, highly pure Mo 2 CT x MXene was synthesized from Mo 2 Ga 2 C by hydrothermal etching at 180 ℃ in the solution of ammonium hydrogen fluoride (NH 4 HF 2 ). The whole process requires only 2 h and the etching solution concentration is only 1 M. Compared with the acid solutions used in other methods, NH 4 HF 2 used in this method is in solid state and its water solution is mild for handling. Compared with other methods, this method requires a lower concentration of etching solution and a much shorter etching time. The Mo 2 CT x MXene made this method have comparable microstructure and properties with those made by other methods. The initial discharge capacity as an anode of lithium-ion batteries (LIB) was 139.35 mAh g -1 at 0.1 A g -1 . After 150th cycles, the final discharge capacity was 62.42 mAh g -1 at 0.1 A g -1 . The electrochemical performance is slightly higher than the sample made by general HF etching. This is the first report to make Mo 2 CT x MXene from the etching of bifluoride salt. Due to the short etching time and low concentration of the etching solution, this method can rapidly make Mo 2 CT x MXene at in low cost, which provides a route to explore the large-scale production of Mo 2 CT x MXene.
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Small
·
2025
·
IF 12.1
Dongli Li,Zhan Zhang,Mingze Jiao,Yinan Dong,Shuyan Yu,Congju Li,Hongyan He,Jingkun Jiang,Kaihui Liu,Zehui Li
2D metal carbides/nitrides (MXenes) have attracted considerable interests in NH 3 sensing due to their high electrical conductivity and abundant terminal groups. However, the strong interlayer interactions between MXene nanosheets result in challenges related to sensor recovery and rapid response decay in MXene-based sensors. Here, A one-step hydrothermal strategy is developed that anchors Zn atoms and grows ZnO polycrystals on the Ti vacancies of Ti 3 C 2 T x layers, forming a sandwich-structured ZnO/Ti 3 C 2 T x heterojunction. At room temperature, the NH 3 sensitivity of ZnO/Ti 3 C 2 T x is a remarkable 45-fold higher than that of Ti 3 C 2 T x , with a low detection limit of 138 ppb and a rapid recovery time of 39 s. Furthermore, the heterojunction exhibits exceptional long-term stability, maintaining a consistent response over 21 days. The results confirm that in situ intercalation of the ZnO polycrystals effectively solves the recovery problem in MXene substrates by completely exfoliating the Ti 3 C 2 T x nanosheets. Meanwhile, the room-temperature sensing performance and recovery speed of the sandwich-structured ZnO/Ti 3 C 2 T x is enhanced by rapid electron conduction. This straightforward and effective route for in situ exfoliation and intercalation of MXene layers promises the broader use of 2Dmaterial heterojunctions in sensing applications.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kai Yan,Hua Chen,Xiao Li,Fei Xu,Jun Wang,Qunna Xu,Yan Zong,Yabin Zhang
Continuous monitoring of physiological health status and effective protection against external hazards is an indispensable aspect of healthcare management for critically vulnerable populations, particularly for infants or babies. So, the exploration of all-in-one devices remains critical to avoiding their injury and illness. The integration of multiple properties such as sensing, electromagnetic protection, warming/cooling, and water/bacterial repellence into a common fabric is no doubt a promising solution to coping with diverse application scenarios. However, achieving simultaneous integration in an effective and durable fashion faces huge challenges. Herein, multifunctional fabric was achieved by sequentially coating MXene, carbon nanotubes (CNTs), and self-healing polyurethane (PU) onto cotton fabric. The outstanding conductivity of MXene and CNTs as well as the self-healing ability of PU synergistically enable a flexible, breathable, protective, and sensing fabric with a good durability. It could detect the body motions like bending of the finger, elbow, wrist, and knee, with a high gauge factor of 8.78 and fast response. Moreover, this sensing fabric could protect the wearers against electromagnetic waves and bacteria, delivering a minimum reflection loss of −57.6 dB at 7.6 GHz and high bacterial inhibition efficiency due to the incorporation of MXene and polyethylenimine. Besides, the electrothermal performance of carbonaceous materials enables them to act as a heater for body warmth. The synergistic design of this multifunctional textile offers a promising strategy for producing advanced smart textiles, holding great promise in infant or baby healthcare.
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