SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Xun Zhou,Juerui Zhang,Dongyan Huang,Yinhui Yi,Kechen Wu,Gangbing Zhu
In this work, a ratiometric fluorescence sensing platform was established to detect Cu 2+ and D-PA ( d -penicillamine) based on nitrogen-doped Ti 3 C 2 MXene quantum dots ( N -MODs) that was prepared via a simple hydrothermal method and exhibited strong fluorescent and photoluminescence performance as well as excellent stability. Since the oxidation reaction between o -phenylenediamine (OPD) and Cu 2+ induced the formation of 2,3-diaminophenazine (ox-OPD) which not only can emerge an emission peak at 570 nm, but also inhibit the fluorescence intensity of N -MQDs at 450 nm, a ratiometric reverse fluorescence sensor via fluorescence resonance energy transfer (FRET) was designed to sensitively detect Cu 2+ , where N -MQDs acted as energy donor and ox-OPD as energy acceptor. More importantly, another considerably interesting phenomenon was that their catalytic oxidation reaction can be restrained in the presence of D-PA because of the coordination of Cu 2+ with D-PA, further triggering the obvious changes in ratio fluorescent signal and color, thus a ratiometric fluorescent sensor of determining D-PA was proposed also in this work. After optimizing various conditions, the ratiometric sensing platform showed rather low detection limits for Cu 2+ (3.0 nM) and D-PA (0.115 μM), coupled with excellent sensitivity and stability.
研究领域:
分析化学
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材料科学
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纳米技术
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传感器与执行器
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jialun Chen,Ping Tong,Lingting Huang,Zhonghua Yu,Dianping Tang
An interdigitated capacitance immunosensing system based enzymatic biocatalytic precipitation on micro-comb electrode was designed for the sensitive detection of prostate-specific antigen (PSA) by coupling Ti 3 C 2 MXenes with tyramine signal amplification strategy. The immunosensor was prepared by immobilizing anti-PSA capture antibody on MXenes-coated interdigitated electrode, whereas gold nanoparticles heavily functionalized with horseradish peroxidase (HRP) and detection antibody were utilized as the signal-transducer tags. Introduction of interdigitated electrode was expected to enhance the sensitivity of capacitance immunosensor. This system mainly consisted of the sandwich-type immunoreaction, formation of tyramine-HRP repeats on gold nanoparticle and enzymatic biocatalytic precipitation. The concatenated HRP through the tyramine oxidized numerous 4-chloro-1-naphthol molecules into insoluble benzo-4-chlorohexadienone with the help of H 2 O 2 , and coated the modified immunosensor to keep free ions away from the electrode, thus causing the local alteration in the capacitance. Under optimum conditions, the change of the immunosensor in the capacitance increased with the increasing target PSA concentrations from 0.1 ng mL −1 to 50 ng mL −1 at a detection limit of 0.031 ng mL −1 . Moreover, the interdigitated capacitance immunosensor showed good reproducibility, high specificity and acceptable accuracy for the analysis of human serum specimens in comparison with those obtained from commercial human PSA ELISA kit. Importantly, Ti 3 C 2 MXenes-based interdigitated capacitance transducer open new opportunities for protein diagnostics and biosecurity.
研究领域:
生物传感器
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分析化学
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纳米技术
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蛋白质诊断
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生物安全
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yuxuan Bai,Yu He,Manman Wang,Gongwu Song
Ti 3 C 2 MXene quantum dots (Ti 3 C 2 MQDs) are recognized as promising new nanomaterial recently, while the majority of the Ti 3 C 2 MQDs manifest limited maximum emission in the blue-light range. Herein, the green fluorescence nitrogen, phosphorus-doped Ti 3 C 2 MQDs (N, P-Ti 3 C 2 MQDs) were synthesized via facile microwave-assisted method, which greatly reduces the reaction time. The as-prepared N, P-Ti 3 C 2 MQDs showed excitation-dependent photoluminescence , anti-photobleaching, and favorable dispersibility . Interestingly, the fluorescence of N, P-Ti 3 C 2 MQDs can be quenched by 1,10-phenanthroline-Fe (II) complex (Phen-Fe 2+ ) via inner filter effect (IFE), accompanied by the increased orange color. After introduction of nitrite (NO 2 - ), owing to the redox reaction between NO 2 - and Fe 2+ , the fluorescence will be recovered and the color varies from orange to colorless gradually. Therefore, a colorimetric/fluorometric dual-modal recognition of NO 2 - was fabricated based on N, P-Ti 3 C 2 MQDs and Phen-Fe 2+ complex. Moreover, paper-based test trips were facilely made by the N, P-Ti 3 C 2 MQDs/Phen-Fe 2+ sensing system in response to ultrafast-response, real-time detection of NO 2 - with the assistant of smartphone. This study tendered a novel dual-channel method for real-time visual assay of NO 2 - as well as provided insightful research into functionalized Ti 3 C 2 MQDs regarding in food analysis.
研究领域:
材料科学
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分析化学
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纳米技术
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环境科学
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食品科学
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DOI
高影响因子
OPTICAL FIBER TECHNOLOGY
·
2026
·
IF 2.7
Yumei Zhang,Baoquan Xiao,Zelin Gao,Li Yang,Dekui Zhang,Ning Wang,Tuanjie Che,Xusheng Xia,Liyun Ding
The rapid, accurate and highly sensitive detection of acetylcholine, which was one of the neurotransmitters related to a variety of neurodegenerative diseases has great significance for disease screening, treatment and prognosis. This paper proposed a GNRs/Ti 3 C 2 MXene enhanced optical fiber LSPR acetylcholine biosensor by depositing Ti 3 C 2 MXene nanosheets on the surface of a GNRs-based optical fiber sensing probe via simple electrostatic self-assembly. The refractive index sensitivity of the biosensor was improved due to the advantages of the large specific surface area, hydrophilicity and broadband absorption spectrum of 2D Ti 3 C 2 MXene nanosheets. The refractive index sensitivity of the biosensor with Ti 3 C 2 MXene nanosheets was improved by 44 % compared to that of the GNRs-based biosensor. The biosensor had a good linear relationship in the range of 0–900 μM for acetylcholine concentration with a sensitivity of 0.0304 nm/μM and the detection limit was 6.58 μM. The results indicated that the proposed GNRs/Ti 3 C 2 MXene enhanced optical fiber LSPR acetylcholine biosensor provides a promising avenue of detection for in biotechnology and medicine files.
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DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 48
·23330-23337
·
IF 6.97
Fanjie Xia,Junchao Lao,Ruohan Yu,Xiahan Sang,Jiayan Luo,Yu Li,Jinsong Wu
MXenes are a group of two-dimensional transition metal carbides/nitrides that have been widely used for many useful applications such as energy storage, catalysis and sensors. For large scale applications of MXenes, the ambient stability is a critical issue. However, the detailed degradation mechanism of MXenes remains largely unclear. Here, the oxidation mechanism of MXene flakes under ambient conditions has been studied using aberration corrected scanning transmission electron microscopy (STEM). The heterogeneous growth of titanium oxide has been observed in the vicinity of atomic defects on the MXene basal plane as well as on the edges of MXene flakes. C atoms are oxidized at Ti-vacancies to form amorphous carbon aggregations, while Ti cations are oxidized at the nearby sites with atomic steps/edges. The diffusion of both electrons and Ti cations is involved and the Ti-ion diffusion is prompted by an internal electric field intrinsically built up during oxidation. The anatase TiO2 nanoparticles preferentially grow along the {101} lattice plane. A loose orientation relationship between the anatase TiO2 and MXene was identified, showing that mostly the {101} plane of TiO2 nanocrystals is perpendicular to the Ti3C2-MXene {0001} basal plane. This work reveals at atomic resolution the oxidation mechanism of MXenes under ambient conditions and will shed light on the design and synthesis of more stable MXenes. It may also provide insights to develop a one-step method to synthesize hybrid structures of carbon supported TiO2 nanoparticles for future large scale applications.
研究领域:
材料科学
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纳米技术
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电子显微学
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能源材料
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腐蚀与降解
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DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Luyao Wang,Zhe Bai,Xiangwen Zhang,Guozhu Li
Hydrodesulfurization (HDS) is an important technique that is widely adopted in the petroleum industry to remove harmful sulfur compounds for environmental protection. MoS2 is the most commonly employed HDS catalyst but tends to stack due to its high surface energy. Active MoS2 nanosheets are anticipated to be well supported for preventing aggregation and increasing accessibility. In the current study, two-dimensional Ti3C2 MXene is utilized as a novel support to controllably anchor MoS2 nanosheets for efficient HDS. The composite of Ti3C2-supported CoMoS2 (CoMoS2/Ti3C2) with a 3D interconnected network was successfully constructed by a facile, one-step hydrothermal method. Detailed characterizations showed that MoS2 nanosheets vertically grew in situ on and between the layers of Ti3C2 MXene. CoMoS2/Ti3C2 possesses a well-defined open structure with a larger specific surface area and a higher proportion of CoMoS active phase compared with unsupported CoMoS2. As catalyzed by CoMoS2/Ti3C2, the reaction rate constant was effectively increased to 2.8 times that on CoMoS2 for the HDS of dibenzothiophene. CoMoS2/Ti3C2 also showed good stability in a harsh high-temperature reaction environment.
研究领域:
材料科学
·
催化化学
·
能源化工
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haizhen Liu,Chenglin Lu,Xinchun Wang,Li Xu,Xiantun Huang,Xinhua Wang,Hua Ning,Zhiqiang Lan,Jin Guo
Two-dimensional vanadium carbide (V2C) and titanium carbide (Ti3C2) MXenes were first synthesized by exfoliating V2AlC or Ti3AlC2 and then introduced jointly into magnesium hydride (MgH2) to tailor the hydrogen desorption/absorption performances of MgH2. The as-prepared MgH2–V2C–Ti3C2 composites show much better hydrogen storage performances than pure MgH2. MgH2 with addition of 10 wt % of 2V2C/Ti3C2 initiates hydrogen desorption at around 180 °C; 5.1 wt % of hydrogen was desorbed within 60 min at 225 °C, while 5.8 wt % was desorbed within 2 min at 300 °C. Under 6 MPa H2, the dehydrided MgH2–2V2C/Ti3C2 can start to recover hydrogen at room temperature, and 5.1 wt % of H2 is obtained within 20 s at a constant temperature of 40 °C. The reversible capacity (6.3 wt %) does not decline for up to 10 cycles, which shows excellent cycling stability. The addition of 2V2C/Ti3C2 can remarkably lower the activation energy for the hydrogen desorption reaction of MgH2 by 37% and slightly reduce the hydrogen desorption reaction enthalpy by 2 kJ mol–1 H2. It was demonstrated that the combination of V2C and Ti3C2 promotes the hydrogen-releasing process of MgH2 compared with addition of only V2C or Ti3C2, while Ti3C2 impacts MgH2 more significantly than V2C in the hydrogen absorption process of MgH2 at ambient temperatures. A possible mechanism in the hydrogen release and uptake of the MgH2–V2C–Ti3C2 system was proposed as follows: hydrogen atoms or molecules may preferentially transfer through the MgH2/V2C/Ti3C2 triple-grain boundaries during the desorption process and through the Mg/Ti3C2 interfaces during the absorption process. Microstructure studies indicated that V2C and Ti3C2 mainly act as efficient catalysts for MgH2. This work provides an insight into the hydrogen storage behaviors and mechanisms of MgH2 boosted by a combination of two MXenes.
研究领域:
材料科学
·
能源存储
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fanfan Liu,Aiguo Zhou,Jinfeng Chen,Jin Jia,Weijia Zhou,Libo Wang,Qianku Hu
Here we reported the preparation of Ti 3 C 2 MXene and Ti 2 C MXene by etching Ti 3 AlC 2 and Ti 2 AlC with various fluoride salts in hydrochloric acid (HCl), including lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), and ammonium fluoride (NH 4 F). As-prepared Ti 2 C was further delaminated by urea, dimethylsulfoxide or ammonium hydroxide. Based on theoretical calculation and XPS results, the type of positive ions (Li + , Na + , K + , or NH 4 + ) in etchant solution affect the surface structure of prepared MXene, which, in turn, affects the methane adsorption properties of MXene. The highest methane adsorption capacity is 8.5 cm 3 /g for Ti 3 C 2 and 11.6 cm 3 /g for Ti 2 C. MXenes made from LiF and NH 4 F can absorb methane under high pressure and can keep methane under normal pressure, these MXenes may have important application on capturing methane or other hazardous gas molecules. MXenes made from NaF and KF can absorb methane under high pressure and release methane under low pressure. They can have important application in the adsorb storage of nature gas.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2018
·
IF 4.66
Fanyu Kong,Xiaodong He,Qianqian Liu,Xinxin Qi,Dongdong Sun,Yongting Zheng,Rongguo Wang,Yuelei Bai
The Si@Ti 3 C 2 MXene nanocomposite was prepared in this paper by simply ultrasonic mixing of commercially available nanosized Si and Ti 3 C 2 MXene. The introduction of Ti 3 C 2 makes the aggregation of silicon nanoparticles relieved. Electrochemical measurements show that the nanocomposite maintains a reversible capacity of 188 mAh·g −1 at 0.2 A·g −1 after 150 cycles and exhibits improved capacity retention, which are significantly better than those of pure Si. The enhanced cycling stability and rate capability are attributed to the good electrical connection between silicon and Ti 3 C 2 . This study provides a new available matrix and guidance for the applications of MXenes in Si-based anode LIBs.
研究领域:
材料科学
·
电化学
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纳米科技
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能源存储
·
功能材料
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DOI
高影响因子
ACS Nano
·
2018
·
IF 13.709
Junchao Lao,Ruijing Lv,Jun Gao,Aoxuan Wang,Jinsong Wu,Jiayan Luo
High, stable, and modulatable ionic conductivity is important for many nanofluidic applications of layered two-dimensional (2D) membranes. In this study, we demonstrate a proton and ionic conductivity of the Ti3C2Tx membrane that is orders of magnitude higher than that of bulk solution at low concentrations. Importantly, the membrane is highly stable in aqueous solution without any modification, due to the strong and attractive interlayer van der Waals interaction and weak electrostatic repulsive interaction. Furthermore, by exploiting the intrinsic photothermal property of MXene, we demonstrate that the ionic conductivity can be reversely, rapidly, and completely switched on or off with laser light. This study should prove MXene membrane as a suitable platform to study and utilize nanofluidic ion transport. It should also inspire future studies to manipulate the mass transport through 2D membranes using their inherent physicochemical properties.
研究领域:
纳米流体力学
·
材料科学
·
膜技术
·
能量转换
·
智能响应材料
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jiangping Yu,Junchao Lao,Dandan Chu,Donghong Wang,Ding Tang,Dayong Li,Guoliang Zhu,Anping Dong,Da Shu,Yinghong Peng,Jiayan Luo,Baode Sun
The manipulation of liquid droplets on a specific surface with reversible wettability is of great importance for various applications from science to industry. Herein, the concept of a smart, flexible photodriven droplet motion (PDM) device with programmable wettability is designed using the 2D material of MXene film. Because of the MXene photothermal property, the Vaseline layer in the device is in transition between solid and liquid states under the heat transformation due to light illumination, thus attractively producing a reversible wettability for liquid motion with respect to sliding and pinning. Multifarious pathways for liquid motion could be designed through the flexibility of light illumination, which is a revolutionary enhancement in diverse liquid motion to form the desired pathways. In addition, we demonstrated liquid motion under illumination of the back face, which has a profound influence on applications, such as microfluidic systems, microengines, and liquid manipulation.
研究领域:
材料科学
·
纳米技术
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微流控
·
表面工程
·
智能器件
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lihua Shen,Jiaming Peng,Qili Chen,Yaozhou Zhang,Chunxia Yu,Yuchen Tang,Jin Li,Kunpeng Zhao,Zhifang Zhang
The development of rapid, sensitive ammonia (NH 3 ) sensors is crucial for emergency response as NH 3 poses serious health risks. We report a high-performance chemiresistive sensor based on Ti 3 C 2 MXene@sulfur nanosheet (MXene@S-NSs) composites that addresses the conductivity limitations of pure S-NSs. The composite combines MXene’s excellent conductivity with S-NSs’ semiconductor properties to create room-temperature NH 3 sensors with exceptional performance: 3 ppt detection limit, 375 % response signal, and remarkably fast response/recovery times of 5 s/4s − representing a significant improvement over pure S-NSs sensors. This enhancement arises from optimized charge transport through p-n heterojunctions and sulfur vacancies in the composite structure. The MXene@S-NSs material demonstrates outstanding sensitivity, stability, and response speed, making it particularly suitable for emergency NH 3 monitoring applications. This work not only presents a practical sensor solution but also establishes an effective materials design strategy for developing next-generation gas sensors through rational 2D material hybridization. The successful integration of MXene and S-NSs provides a blueprint for creating advanced sensing materials with tailored electronic properties and performance characteristics.
研究领域:
材料科学
·
纳米技术
·
气体传感
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环境监测
·
应急响应
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）