ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 45
·2106000
·
IF 18.808
Tianshi Zhao,Chun Zhao,Wangying Xu,Yina Liu,Hao Gao,Ivona Z. Mitrovic,Eng Gee Lim,Li Yang,Ce Zhou Zhao
The highly parallel artificial neural systems based on transistor-like devices have recently attracted widespread attention due to their high-efficiency computing potential and the ability to mimic biological neurobehavior. For the past decades, plenty of breakthroughs related to synaptic transistors have been investigated and reported. In this work, a kind of photoelectronic transistor that successfully mimics the behaviors of biological synapses has been proposed and systematically analyzed. For the individual device, MXenes and the self-assembled titanium dioxide on the nanosheet surface serve as floating gate and tunneling layers, respectively. As the unit electronics of the neural network, the typical synaptic behaviors and the reliable memory stability of the synaptic transistors have been demonstrated through the voltage test. Furthermore, for the first time, the UV-responsive synaptic properties of the MXenes floating gated transistor and its applications, including conditional reflex and supervised learning, have been measured and realized. These photoelectric synapse characteristics illustrate the great potential of the device in bio-imitation vision applications. Finally, through the simulation based on an artificial neural network algorithm, the device successfully realizes the recognition application of handwritten digital images. Thus, this article provides a highly feasible solution for applying artificial synaptic devices to hardware neuromorphic networks.
研究领域:
神经科学
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材料科学
·
电子工程
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Chunxiao Wu,Sha Zhang,Jin Zhong Zhang,Yan Li
Water contamination from industrial activities has been a major problem throughout the world. Typically, lead ions (Pb2+) are recognized as a persistent contaminant posing a great threat to our environment and human health, which urgently needs to be solved. Adsorption is one of the most effective ways to solve it. MXenes show great potential for applications in the fields of adsorption due to their large specific surface area, excellent hydrophilicity, and structural stability. In this work, a series of V2CTx MXenes including multilayered V2CTx MXene (M-V2C), alkalized V2CTx MXene (A-V2C), and single-layer V2CTx MXene (S-V2C) were prepared by an etching method to apply for Pb2+ adsorption. Compared to M-V2C and A-V2C, S-V2C not only had the highest adsorption efficiency under the same conditions but also exhibited a wide pH adsorption ability in the range of 1–14, which cannot be achieved by other adsorbents. In addition, it showed great cycle performance after 10 cycles and selective adsorption of Pb2+ in the presence of other ions. Factors affecting the Pb2+ adsorption capacity of V2C and related mechanisms were also thoroughly investigated. This work demonstrates for the first time that S-V2C is a novel adsorbent material with excellent pH tolerance, regeneration performance, and selective adsorption ability, which shed bright light on the related applications.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Zhengmao Ding,Tiancheng Gu,Rui Zhang,Shouyi Sun,Kaiqiang Wang,Hanli Zhang,Jinjin Li,Yunjun Luo
Nanofluidic channels inspired by electric eels open a new era of efficient harvesting of clean blue osmotic energy from salinity gradients. Limited by less charge and weak ion selectivity of the raw material itself, energy conversion through nanofluidic channels is still facing considerable challenges. Here, a facile and efficient strategy to enhance osmotic energy harvesting based on drastically increasing surface charge density of MXenes subnanochannels via oxygen plasma is proposed. This plasma could break Ti–C bonds in the MXenes subnanochannels and effectively facilitate the formation of more Ti–O, C═O, O–OH, and rutile with a stronger negative charge and work function, which leads the surface potential of MXenes membrane to increase from 205 to 430 mV. This significant rise of surface charge endows the MXenes membrane with high cation selectivity, which could make the output power density of the MXenes membrane increase by 248.2%, reaching a high value of 5.92 W m −2 in the artificial sea-river water system. Furthermore, with the assistance of low-quality heat at 50°C, the osmotic power is enhanced to an ultrahigh value of 9.68 W m −2 , which outperforms those of the state-of-the-art two-dimensional (2D) nanochannel membranes. This exciting breakthrough demonstrates the enormous potential of the facile plasma-treated 2D membranes for osmotic energy harvesting.
研究领域:
材料科学
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能源科学
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纳米技术
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产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Zhang Tianze,Chang Libo,Zhang Xiaofeng,Wan Hujie,Liu Na,Zhou Liujiang,Xiao Xu
The surface and interface chemistry are of significance on controlling the properties of two-dimensional transition metal carbides and nitrides (MXenes). Numerous efforts have been devoted to the regulation of Ti 3 C 2 T x MXene, however, tuning interlayer spacing and surface halogen termination of other MXenes (besides Ti 3 C 2 T x ) is rarely reported while demanded. Here we propose a Lewis-basic halides treatment, which is capable of simultaneously engineering the interlayer spacing and surface termination of various MXenes. Benefited from the abundant desolvated halogen anions and cations in molten state Lewis-basic halides, the -F termination was substituted by nucleophilic reaction and the interlayer spacing was enlarged. Ti 3 C 2 T x MXene treated by this method showed a high specific capacity of 229 mAh g −1 for Li + storage, which is almost 2 times higher than pristine one. Considering the universality, our method provides an approach to regulating the properties of MXenes, which may expand their potential applications in energy storage, optoelectronics and beyond.
研究领域:
材料科学
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化学
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能源存储
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
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2024
·
IF 9.7
Lizheng Yang,Yingqi Heng,Jianping Sun,Dongying Hu,Fangchao Cheng
Conventional supercapacitors face narrow voltage and an inevitable reduction in capacitance retention during operation, significantly preventing its further commercial application. So, biomass-derived composite materials have attracted intensive attention, especially for pseudocapacitive supercapacitors. Herein, a high-end utilization strategy of lignin to induce a 3D porous layered MXenes/graphene oxide hybrid electrode (LGM 2 -80) and homologous gel electrolytes with low interface resistance for lignin-derived supercapacitors is demonstrated by a simple hydrothermal method. A more uniform distribution and smaller nanospheres ≈<10 nm of lignin prevent the restacking and increase the interlayer spacing of graphene oxide, also play an adhesive role between graphene oxide and MXene, guaranteeing the maximization of the pseudocapacitance effect between lignin and MXene. Consequently, the LGM 2 -80 electrode showed a wide operating potential (−0.7∼1.0 V), breaking through the bottleneck of MXene-derived devices with limited working voltage (typically≤0.6 V). Furthermore, the lignin-derived symmetric quasi-solid-state supercapacitor (LGM 2 -80//lignin gel//LGM 2 -80) possesses an excellent capacitance retention rate of 149 % at 5,000 cycles, which is far exceeding the current reported supercapacitors. This innovative use of lignin opens up new perspectives for ultra-voltage and ultra-high capacitance retention of advanced supercapacitors.
研究领域:
材料科学
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能源存储
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Junling Wang,Haobo Zhou,Shui Yu,Zhirong Wang,Jiaqing Zhang,Lingxin He
It is well-recognized that, the inferior fire safety has been the stumbling block for the extensive usages of bismaleimide resin (BMI). Hence, a ternary hierarchical MXenes-based nanoarchitecture (CMAMX) is rationally engineered, towards suppressing the heat and toxicants emissions of BMI. By incorporating 2.0 wt% CMAMX, the marked reductions of 36.5%, 32.9%, 33.5%, 29.2% on peak heat release rate, total heat release, peak smoke production rate, total smoke production are observed. Moreover, the peak CO production rate and peak CO 2 production rate are decreased by 40.0% and 54.0%. Additionally, TG-IR test offers evidences for the impeded releases of NO and HCN gases. These results strongly corroborate the strength of CMAMX in impairing the heat and toxicants generations of BMI. Interestingly, the improved mechanical properties are acquired after using CMAMX, deriving from the multiple hydrogen bond interactions and induced nanoconfinement effect. For instance, the tensile toughness is promoted by 50.7%. Briefly, this contribution may be encouraging for the engineering of MXenes-based nanostructure, towards constructing high-performance polymer composites.
研究领域:
材料科学
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防火安全工程
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高分子复合材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yuan Lei,Yi Cui,Qiang Huang,Jibo Dou,Defu Gan,Fengjie Deng,Meiying Liu,Xiancai Li,Xiaoyong Zhang,Yen Wei
Two demensional nanomaterials have attracted increasing research interest for various applications ranging from environmental adsorption, biomedical applications, catalytic degradation and energy storage owing to their high surface areas, facile surface functionalization . In this work, we demonstrated the preparation and environmental adsorption applications of 2D material MXenes through extracting Al layer from Ti 3 AlC 2 in a simpler and safer way. The surface of Ti 3 C 2 was modified with sulfonic groups via aromatic coupling-diazotization. The adsorption behavior and capacity of the Ti 3 C 2 and functionalized Ti 3 C 2 towards methylene blue (MB) were also examined and compared. The successful preparation of Ti 3 C 2 and modified Ti 3 C 2 was characterized by a number of techniques, including scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The influence of different experiment conditions such as contact time, solution temperature, pH and initial MB concentrations on the adsorption behavior towards MB were also examined. The results demonstrated that sulfonic groups functionalized Ti 3 C 2 (named as Ti 3 C 2 –SO 3 H) exhibited superior removal efficiency for MB. The maximum adsorption capacity of Ti 3 C 2 –SO 3 H towards MB is over four folds that of raw materials. The results of kinetics and isotherms studies demonstrated that experimental data were better described by pseudo-first-order model and Langmuir isotherm adsorption model, respectively. The process of MB onto surface of adsorbents was endothermic and spontaneous. Experimental details about pH indicated that the dye adsorption capability is favorable when the aqueous solution is alkaline. Based on the above results, cationic dye molecules were removed effectively by using Ti 3 C 2 –SO 3 H as adsorbent, which promotes the development of Ti 3 C 2 –SO 3 H for wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Miaomiao Li,Xiuying Peng,Yujie Han,Lifang Fan,Zhiguang Liu,Yujing Guo
MXenes are attractive for various biosensors owning to their tunable versatile properties. Herein, Ti 3 C 2 nanosheets (Ti 3 C 2 NSs) were found to possess intrinsic peroxidase-like activity, and which could be enhanced by single-stranded DNA (ssDNA) adsorbed on the nanosheets. Hence, a simple label-free sensing strategy was developed for colorimetric detection of biomolecules, based on Ti 3 C 2 NSs as a peroxidase mimic enzyme and ssDNA aptamer as an enzymatic activity enhancement factor along with a recognition substance for the target. In the presence of target biomolecules, the aptamers were desorbed from Ti 3 C 2 NSs due to the specific binding of targets to aptamers, thus bringing about the decrease of catalytic activity. Thrombin (TB) as the model was determined by this constructed biosensor with a linear range of 1.0 × 10 −11 to 1.0 × 10 −8 M, and evaluated subsequently in the real blood samples with satisfactory results. This work highlights Ti 3 C 2 MXenes as a nanomaterial mimic enzyme (called nanozyme) for monitoring biomolecules by target-specific recognition strategy.
研究领域:
生物传感
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材料科学
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医学检测
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jianguang Xu,Zhiyong Liu,Qiang Wang,Junsheng Li,Yuxiang Huang,Mengnan Wang,Linyu Cao,Wei Yao,Haijiang Wu,Chi Chen
MXenes show promising potential in supercapacitors due to their unique two-dimensional (2D) structure and abundant surface functional groups. However, most studies about MXenes have focused on tailoring surface structures by alternating synthesis methods or post-etch treatments, and little is known about the inherent relationship between surface groups and M elements. Herein, we propose a simple and novel strategy to adjust the surface structure of few-layered MXene flakes by adding a small amount of Nb element. Because of the strong affinity between Nb and O elements, the as-received V1.8Nb0.2CTx and Ti2.7Nb0.3C2Tx MXenes have much fewer −F functional groups and a higher O content than V2CTx and Ti3C2Tx MXenes, respectively. Thus, both V1.8Nb0.2CTx and Ti2.7Nb0.3C2Tx MXenes show enhanced pseudocapacitance performance. Especially, V1.8Nb0.2CTx delivers an ultrahigh volumetric capacitance of 1698 F/cm3 at a scan rate of 2 mV/s. Moreover, benefiting from the high activity of MAX precursors obtained through a fast self-propagating high-temperature synthesis, the etching time to produce V-based MXenes is much shorter than that in previous reports. Therefore, the results presented here are applicable to the surface engineering and rational design of 2D MXene materials and develop them into promising, cost-effective electrode materials for supercapacitors or other energy-storage equipment.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 10
·3966-3973
·
IF 9.8
Huajian Feng,Qingyong Tian,Junhao Huang,Xinwei Cui,Jingyun Jiang,Yapeng Tian,Li Ye,Qun Xu
Two-dimensional (2D) transition metal carbides, nitrides, or carbonitrides, regarded as MXenes, hold great promise for an extensive range of applications such as efficient catalysis and energy conversion and storage materials. Up to now, various strategies for synthesizing MXenes have been explored, typically including an F-containing aqueous etching process, a molten salt etching method, etc. In this work, for the first time, we have designed a novel solid-phase etching approach to synthesize two-dimensional titanium carbide (MXenes) sheets with the assistance of supercritical CO2 (SC CO2), and the solid-phase etching mechanism behind the efficient fabrication process has also been revealed from a series of characterization methods. It is demonstrated that SC CO2-coated FeF3·3H2O can successfully help realize the delamination of multilayer MXenes into single-layer or few-layer MXenes, and at the same time, the as-prepared MXene sheets are demonstrated to have large surface area and size, high quality and rich fluorine termination groups, which make them efficient in the alkaline hydrogen evolution reaction (HER).
研究领域:
材料科学
·
催化
·
能量转换与存储
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Fan Qi,Chen Minghua,Li Longyi,Li Minghui,Xiao Chuanxiao,Zhao Tianci,Pan Long,Liang Ningning,Huang Qing,Yu Lijing,Zhu Laipan,Naguib Michael,Liang Kun
Two-dimensional transition metal carbides and/or nitrides (MXenes), especially their few-layered nanosheets, have triggered burgeoning research attentions owing to their superiorities including extraordinary electrical conductivity, accessible active surface, and adjustable processability. Molten salts etching route further achieves their controllable surface chemistry. However, the method encounters challenges in achieving few-layered structures due to more complex delamination behaviors. Herein, we present an efficient strategy to fabricate Cl- or Br-terminated MXene nanoflakes with few-layers, achieved by electrochemical intercalation of Li ions and concomitant solvent molecules from the electrolyte solution, with gaseous propylene molecules to disrupt interlayer forces. By controlling cut-off voltages, the optimal protocol results in nanosheets with a recovery rate of ~93% and preserved surface chemistry. The resultant MXenes dispersions were employed as lubricants to enhance tribovoltaic nanogenerators, where Ti 3 C 2 Br 2 displayed superior electrical output. These findings facilitate the understanding of MXenes’ intrinsic physical properties and enable the nanoengineering of advanced electronic devices.
研究领域:
材料科学
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纳米技术
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2024
·Vol. 40
·期 6
·1081-1087
·
IF 1.8
Mei Xuqiao,Zeng Zhenhua,Xu Wenxin,Yang Huicong,Zheng Yuanhai,Gao Haimin,Wu Chuncai,Zheng Yanping,Xu Qiaoli,Wang Guowei,Xu Yuhuang,Wu Ayang
CA125 (carbohydrate antigen 125) is an important biomarker of ovarian cancer, so developing effective method for its detection is of great significance. In the present work, a novel sandwich-like electrochemical immunosensor (STEM) of CA125 was constructed by preparing nanoribbon-like Ti 3 C 2 T x MXenes (Ti 3 C 2 T x NR) to immobilize primary antibody (PAb) of CA125 and UIO-66-NH 2 MOFs structure to immobilize second antibody (SAb) and electroactive toluidine blue (Tb) probe. In this designed STEM assay, the as-prepared Ti 3 C 2 T x NR nanohybrid offers the advantages in large surface area and conductivity as carrier, and UIO-66-NH 2 provided an ideal platform to accommodate SAb and a large number of Tb molecules as signal amplifier. In the presence of CA125, the peak currents of Tb from the formed STEM structure increase with the increase of CA125 level. After optimizing the related control conditions, a wide linear range (0.2–150.0 U mL −1 ) and a very low detection limit (0.05 U mL −1 ) of CA125 were achieved. It’s thus expected the developed STEM strategy has important applications for the detection of CA125. Graphical abstract
研究领域:
生物医学工程
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分析化学
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肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）