BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Tianzi Xia,Guangyan Liu,Junjie Wang,Shili Hou,Shifeng Hou
In this work, the synthesized MXene (Ti 3 C 2 T x ) exhibited large specific area, biocompatibility, excellent electronic conductivity , and good dispersion in aqueous phase . The Chit/ChOx/Ti 3 C 2 T x nanocomposite was prepared through the continuous self-assembled process. Its structure is characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Moreover, the biosensor for cholesterol detection was fabricated via a one-step dip-coating method. Chit andTi 3 C 2 T x act as a support matrix to immobilize ChOx enzyme , and also play a role in increasing the electrical conductivity . Meanwhile, the addition of redox mediator (Fe(CN) 6 3 - /4- ) facilitates the electron transport from the analyte to the modified electrode in the oxidation of cholesterol. The DPV response exhibited an increase in current with increasing cholesterol concentration. Under the optimum conditions, the DPV response of the biosensor indicated a good linear relationship with the concentration of cholesterol ranging from 0.3 to 4.5 nM with a low detection limit of 0.11 nM, and a high sensitivity of 132.66 μA nM −1 cm −2 . In addition, with favorable selectivity and stability, the biosensor has been used to detect cholesterol in real samples and the results demonstrate that the biosensor has excellent practicability.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yiming Chen,Wenquan Gu,Li Tan,Zhimin Ao,Taicheng An,Shaobin Wang
Photocatalytic H 2 O 2 production by O 2 reduction is an environmental-friendly process for solar light conversion to chemical energy. In this work, Ti 3 C 2 MXene was used as a non-noble metal cocatalyst to load on P25 as Ti 3 C 2 /TiO 2 (TC/TO) photocatalysts for photocatalytic H 2 O 2 synthesis. A H 2 O 2 formation rate (179.7 μmol L −1 h −1 ) of the optimized 10 %-TC/TO composite was obtained to be over 21 folds as high as that of P25 under UV light. Radical quenching experiments and superoxide radical detection confirmed the superoxide radical as the primary intermediate, suggesting the O 2 reduction in two-step single-electron indirect reaction. The higher activity of TC/TO can be attributed to the functions of Ti 3 C 2 MXene in accelerating the separation and transfer of photogenerated electron-hole pairs, suppressing their recombination, and blocking the surface Ti OOH formation. This work proves the promising roles of Ti 3 C 2 MXene in the photocatalytic reaction and further expands their new applications in photocatalysis .
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 24
·2200991
·
IF 6.389
Xuesong Li,Ni Xue,Qian Yao,Liuyuan Han,Xiangyan Zhao,Bo Li,Tao He,Xutang Tao
As the quintessential representation of MXenes, Ti 3 C 2 T x has attracted widespread scientific interest and has demonstrated unparalleled potential in various applications. However, Ti 3 C 2 T x has always been subject to its ambient instability, which deteriorates the intrinsic properties and limits the practical applications. The mechanism responsible for oxidative degradation of Ti 3 C 2 T x has remained elusive, and the subsequent improvement of the preparation for ambient-stable Ti 3 C 2 T x is still a challenge. In this paper, the ambient instability of Ti 3 C 2 T x is found to be attributed to the presence of many oxidation active sites on the surface, the formation of which is highly correlated with the enrichment of etching by-products (AlF x or Al(OF) x ). Based on the above findings a slow-speed etching method is designed, using tetramethylammonium hydroxide as a separate etching-agent, to avoid adsorption of fluorine-containing by-products during etching. The prepared high-quality Ti 3 C 2 T x flakes exhibit excellent ambient stability even after 4 months of dispersion in water, unlike conventional aqueous Ti 3 C 2 T x dispersions that can only be kept for a few days. The intrinsic stability allows Ti 3 C 2 T x to avoid its decomposition in seawater desalination, and it exhibits superior desalination ability with a maximum reduction of 62.2% in Na + permeability and a maximum increase of 300% in water flux.
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MICROCHIMICA ACTA
·
2025
·Vol. 193
·期 1
·15
·
IF 5.3
Zhang Yan,Yan Yuting,Huang Yue
An innovative electrochemical biosensor is proposed for the sensitive detection of ofloxacin (OFL) by integrating exonuclease I (Exo I)–assisted recognition-transduction strategy into the MXene/AuNP-enhanced electrochemical platform. Through ingenious design, the presence of OFL triggers the competitive displacement reaction and enables Exo I to hydrolyze the released single-stranded DNA probe containing the sequence of Pb 2+ -DNAzyme, protecting the signal probes on the electrode surface from DNAzyme cleavage, which eventually brings about a remarkable electrochemical signal positively related to the concentration of OFL. MXene/AuNPs with excellent conductivity, large specific surface area, and good chemical stability are employed as the electrode substrate to efficiently accelerate charge transfer and increase the loading capacity for signal probes, leading to the enhancement of signal output and endowing the biosensor with high sensitivity, rapid response, and fine robustness. Taking advantage of OFL recognition–initiated Exo I hydrolysis to DNAzyme, the electrochemical platform with “signal-off/on” mode can detect OFL with good specificity and reduced background interference. Benefiting from the synergistic effect of the involved sensing elements, the developed electrochemical biosensor achieves a low detection limit of 0.47 pg mL −1 with a broad linear range and exhibits satisfactory detection performance in real food samples, indicating potential practical applicability in food safety monitoring. Graphical
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DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Changqin Gao,Shaohan Hu,Yuanjia Ding,Yucheng Wang,Zong-Xiang Xu
The surfaces of MXene etched via chemical etching feature randomly diverse terminals, which creates an uneven surface potential. The non-uniform potential promotes disordered stacking of nanosheets, which in turn precipitates a rapid deterioration in the electrochemical performance of MXene-based electrodes at high mass loadings (ML). In this study, L-ascorbic acid (AA) is used to block polymerization of dopamine (DA), forming a uniform polydopamine (PDA) coating on MXene surfaces, which corrects the surface potential distribution. And we add borax to do a further modification to increase stabilization. Characterization results demonstrate that introducing AA creates a more uniform PDA coating and surface potential distribution, which not only increases the interlayer spacing but also improves the in-plane stacking orderliness of the nanosheets, which is beneficial for electrolyte transport. The as-prepared electrode retains high areal capacitance (5.6 F cm −2 ) at 10.0 mg cm −2 , and the resulting symmetric device exhibits outstanding cycling stability. This study offers an insight for optimizing the surface potential and orientation of MXene, paving the way toward high ML electrode applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyue Zhang,Qianru Sun,Xinhang Yu,Wenxiang Wang,Liangjiu Bai,Hou Chen,Kai Wei,Lixia Yang
MXene and its modified derivatives exhibit exceptional properties, including outstanding mechanical performance, high electrical conductivity, hydrophilicity, and tunable surface structures, attributable to their unique composition and structure. These characteristics render them highly effective as filler materials within hydrogels. In this study, polydopamine (PDA) was employed to protect MXene against oxidation while simultaneously endowing the hydrogel with adhesion properties. The resulting MXene@PDA is uniformly dispersed within the hydrogel's three-dimensional network, establishing efficient electron transport pathways that confer excellent electrical conductivity to the hydrogel. The hydrogel matrix, composed of xanthan gum (XG) and polyacrylic acid (PAA), was crosslinked and endowed with antifreezing capabilities using phytic acid (PA). Surface-bound hydroxyl (-OH) groups on MXene@PDA dynamically crosslink with the polymer matrix through hydrogen bonding. This synergistic interaction significantly enhances the hydrogel's self-healing efficiency (84.3 %), mechanical strength (1.21 MPa), and stretchability (1180 % strain). The resulting flexible sensor accurately detects and responds to motion signals even at sub-zero temperatures as low as −15 °C, demonstrating exceptional sensitivity and stability. This work establishes a robust methodology for fabricating multifunctional MXene-based composite hydrogel sensors integrating anti-freezing, self-healing, high conductivity, and flexibility.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Wenjia Guo,Shiwei Chen,Yanlei Wang,Kun Li,Rongrong Wang,Ping Zhang,Xiuhong Yang,Hongyan He
High-temperature moisture is commonly encountered in both natural and industrial processes, presenting significant opportunities for clean electricity generation. However, due to insufficient selective ion transport, traditional moisture-driven power generators (MPGs) face challenges in achieving high performance at elevated temperatures. To address this issue, we develop a membrane by confining ionic liquids within MXene nanosheets, resulting in an MPG that delivers a remarkable electrical current of 4.49 mA and a power density of 239.00 µW cm−2 at 100 °C, comparable to traditional hydropower stations. Molecular dynamics simulations and in situ experimental characterization suggest that the highly hydrophilic surface of MXene facilitates the formation of an interfacial water layer and a stable hydrated anion state within the nanochannels at high temperatures. Consequently, the rapid diffusion of water at elevated temperatures significantly enhances the transport of anions while minimally affecting cation diffusion. This selective anion transport capability contributes to the MPG's excellent moisture-driven power performance at high temperatures. Leveraging this enhanced power output, we further integrate the MPG device with a geothermal power generation system, demonstrating continuous power generation and efficient utilization of high-temperature geothermal steam.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Yitong Guo,Chenxiao Wang,Xianju Shi,Yanhuan Chen,Lifang Wang,Yanan Liu,Yuqian Wang,Xiaoning Wang,Yukai Chang,Aiguo Zhou
In this paper, a green and efficient low-concentration ammonium fluoride etching strategy is developed for the synthesis of two-dimensional highly pure Mo 2 CT x MXene. Using the Mo 2 Ga 2 C MAX phase as the precursor, highly pure Mo 2 CT x MXene was prepared via hydrothermal etching with a 1 M NH 4 F aqueous solution at 160 °C for 12 h. By employing a slow-release fluorine source mechanism, the NH 4 F concentration was maintained at 1 M, significantly reducing toxicity risks and improving operational safety while providing a safe pathway for large-scale MXene production. The structural characterization of the material revealed that the as-prepared Mo 2 CT x MXene exhibits a typical two-dimensional layered structure, with microscopic morphology and crystal parameters consistent with those obtained by conventional etching methods. As an anode material for lithium-ion batteries, the Mo 2 CT x MXene delivered an initial discharge specific capacity of 873.5 mAh g −1 at a current density of 0.05 A g −1 , and retained 33.7 mAh g −1 after 100th cycles of high-rate cycling at 0.5 A g −1 . This represents the first application of a low-concentration NH 4 F etching system for preparing Mo 2 CT x MXene. The findings of this study not only enhance the safety of MXene synthesis but also provide new research directions for the development of green synthesis processes for Mo 2 CT x MXene.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hong Li,Feng Shao,Xinzhu Wen,Yusen Ding,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Developing scalable and facile techniques to design and construct unique structures of cathodes with high performance is challenging for the practical Li-S batteries. In this work, highly effective and scalable cathodes based on curved graphene/MXene bi-nanosheets-constituted fibers is demonstrated for long-lifetime Li-S batteries. Wet-spinning is introduced to design and fabricate sulfur cathodes based on graphene/MXene hybrid fibers, in which sulfur is uniformly distributed and intimately enveloped between graphene and MXene nanosheets. The high chemical affinity towards polysulfides enabled by MXene is demonstrated by experiments and density functional theory (DFT) calculations. The assembled cells show high sulfur utilization (the discharge capacity of 1483.1 mAh g −1 at 0.1 C), high rate performance (733.3 mAh g −1 at 2 C) and excellent long cycle stability (0.043% per cycle decay at 1 C over 1000 cycles). Moreover, a reversible areal capacity of 5 mAh cm −2 is achieved under a high sulfur loading of 5.6 mg cm −2 , revealing its great potential for practical applications. This study gives a valuable guidance to design advanced sulfur cathodes for high-performance Li-S batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xinxin Li,Min Yang,Wenjing Qin,Changshun Gu,Lei Feng,Zhenhao Tian,Hanying Qiao,Junji Chen,Jianxing Chen,Shougen Yin
With the development of wearable intelligent devices, flexible textiles integrate high-performance sensing, electromagnetic shielding and Joule heating show broad application prospects. However, it is still difficult to improve all the performance simultaneously through simple methods. Here, we have prepared MXene/PU composite fiber film with multilayer porous network structure by using the electrospinning spraying alternate operation process. This film has ultra-high sensitivity (GF= 77,751), super large detection range (400%) and ultra-low detection limit (0.05%). Secondly, the multilayer fiber film has excellent EMI shielding performance (EMI SE=38 dB), and the EMI shielding capacity of the multilayer film can still exceed the commercial standard when it is stretched to 20%. Finally, the multilayer fiber film shows better Joule heating performance, including lower voltage drive (2 V) and faster thermal response (12 s). The excellent performance of the composite come from the synergistic effect of MXene and the unique multi-layer porous network structure. Among them, MXene provides excellent conductivity, electrothermal and electromagnetic shielding performance. The layered porous network structure can store the strain in advance and form a parallel circuit, which improves the sensing range, increases the transmission path of electromagnetic waves , and realizes the homogeneity of Joule heating. In addition, the outer PU slows down the invasion of oxygen, thus slows down the oxidation of MXene, and ensures the performance of materials in a long time. The multilayer fiber film has been proved to be suitable for sensing at low temperature, and has broad application prospects in wearability.
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Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 5
·1673-1678
·
IF 6.641
Zhangshuo Liu,Yu Zhang,Hao-Bin Zhang,Yang Dai,Ji Liu,Xiaofeng Li,Zhong-Zhen Yu
High-performance and flexible electrically conductive materials with satisfactory mechanical strength are vital in shielding electromagnetic interference (EMI) and radiation for portable electronics and wearable devices. Two-dimensional transition metal carbides/nitrides (MXenes) with remarkable metallic conductivity are considered as ideal candidates for ultrathin EMI shielding films, but their poor mechanical performances often impede their practical applications. Herein, we fabricate highly conductive MXene-based films with remarkable EMI shielding performance and excellent mechanical strength by enhancing the interfacial adhesion among the adjacent MXene nanosheets with multivalent aluminum ions. The tensile strength of the MXene film is significantly enhanced by 190% from 28.7 to 83.2 MPa with the introduction of aluminum ions and its conductivity is retained at 265 600 S m−1, exhibiting superior comprehensive performances to the previously reported results with other reinforcements. The strong and highly conductive MXene film with a small thickness of 39 μm exhibits one of the highest EMI shielding performances of over 80 dB in the X-band. This work provides a simple and efficient strategy for designing and fabricating high-performance MXene-based materials for efficient EMI shielding applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yuyi Wei,Dandan Liang,Hongyang Zhou,Shoujie Huang,Weiwei Zhang,Jin Gu,Chuanshuang Hu,Xiuyi Lin
Wood is a promising substrate to decorate conductive material for preparing sustainable composites with electromagnetic interference (EMI) shielding function. Understanding the influences of the assembly manner of conductive materials on the EMI shielding property is essential to develop a facile fabrication method. Herein, the assembly manner of the MXene on wood is adjusted by applying three coating methods, i.e., vacuum-assisted immersion, spray coating, and brush coating. The surface morphologies , interaction between wood and MXene, electrical properties, and EMI shielding effectiveness (SE) of MXene-decorated wood (M/wood) composites were studied systematically. The results show that brush coating provides a flat and laminated MXene layer, hence an efficient conductive network can be constructed with a small loading of MXene. Ultimately, the M/wood composite prepared by brush coating displays an EMI SE of 40.5 dB at 8.2 ∼ 12.4 GHz with a MXene loading of 1.41 mg/cm 2 . Moreover, M/wood composites demonstrated excellent anti-mold function thanks to the reducing activity and fluorine-containing groups of MXene.
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