ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Tianyao Wang,Wenming Xiong,Xingguo Tian,Xiaoyan Xu
MXene quantum dots (MQDs) exhibit vast application prospection the field of fluorometric sensing, but how to efficiently utilize MQDs for the selective detection of two components still remains a challenge. Herein, an off–on fluorescence sensor based on ethylenediamine-functionalized Ti 3 C 2 MQDs (EDA-MQDs) was designed to selectively and sequentially detect Fe 3+ and histamine. EDA-MQDs were synthesized using a facile ultrasonic-hydrothermal method and exhibited bright blue fluorescence with a quantum yield up to 21.12 %. Inner filter effect occurred between Fe 3+ and EDA-MQDs, resulting in fluorescence quenching at 460 nm. Meanwhile, on account of the strong chelation between imidazole group on histamine and Fe 3+ , the Fe 3+ concentration in the system was reduced, so the fluorescence of EDA-MQDs was recovered. Thus, the as-designed fluorescence probe was used for dual-detection of Fe 3+ and histamine in real samples with satisfactory sensitivity and selectivity. The proposed sensing method was verified to possess good linear response in the range of 1–100 μM and 1–60 μM with detection limits of 0.11 μM and 46 nM for Fe 3+ and histamine, respectively. This work provided a highly effective tool for selective detecting histamine and Fe 3+ as well as tendered a novel strategy for functionalized Ti 3 C 2 MQDs in food analysis.
研究领域:
分析化学
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食品科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Ning Qi,Lirong Mo,Yacen Tang,Youzhou He,Yuqing Wang,Xintong Shi,Yuyu Fang,Xingyan Liu,Siping Wei
Photocatalytic technology is widely used to solve environmental pollution problems, while most photocatalysts have a weak response to visible light, photogenerated charges are easy to recombine, and catalytic activity is limited. Herein, we used electrostatic self-assembly to tightly load Ti 3 C 2 MXene quantum dots (MQDs) onto Bi 2 WO 6 with oxygen vacancies (BWO) to obtain BWO@MQDs composite photocatalytic materials for the degradation of tetracycline (TC). The presence of oxygen vacancies in BWO provided more active sites, facilitating the reduction of O 2 to ·O 2 - by electrons. Moreover, MQDs and BWO could form a Schottky junction at the contact interface, and then the electrons on the BWO conduction band were transferred to MQDs, reducing the photogenerated electron-hole recombination. Under the optimal experimental conditions, the TC degradation efficiency of the BWO@MQDs photocatalyst was 88.12 %, which was 1.61 times that of original Bi 2 WO 6 , and the catalytic activity was well preserved after cycle stability testing. The possible photocatalytic mechanism and photodegradation pathway were revealed by UV–vis, XPS, ESR and LC-MS, the results indicated that ·O 2 - played the most dominant role in TC degradation and the final degradation products were mainly CO 2 and H 2 O. This study has important implications in oxygen vacancies and quantum dots co-modified bismuth-based materials for photocatalysis to solve water pollution problems.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Fanyong Yan,Jingru Sun,Yueyan Zang,Zhonghui Sun,Hao Zhang,Jinxia Xu,Xiang Wang
MXene quantum dots (MQDs) derived from MXene with photoluminescent properties have attracted considerable attention. Herein, nitrogen-doped MQDs (N-MQDs) were constructed by a solvothermal method using Ti 3 C 2 MXene as precursors and o-phenylenediamine (oPD) as the nitrogen source. The morphology, element composition and optical properties of N-MQDs were investigated by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and spectroscopy etc. The obtained N-MQDs are dispersed quasi-spherical nanoparticles , mainly composed of carbon, oxygen and nitrogen, with yellow fluorescence at 580 nm and quantum yield of 5.42 %. In further, N-MQDs can detect Alizarin Red (ARS) based on inner filter effect (IFE) with linear range and detection limit of 0–80 μM and 1.21 μM, respectively. N-MQDs can detect ARS in real water samples, and were expected to have further applications in the fields of environmental monitoring and biosensing.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
Applied Materials Today
·
2019
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IF 8.013
Quan Xu,Wenjing Yang,Yangyang Wen,Shengkun Liu,Zheng Liu,Wee-Jun Ong,Neng Li
Multiple-color emissive MXene quantum dots (MQDs) exhibit vast application prospects in various fields, including optoelectronics, bioimaging, and catalysis. However, the majority of the recent MQDs display limited maximum emission in the blue-light region. Herein, we employ the hydrogen bonds as an adjustment method to prepare novel full-color MQDs using Ti 3 C 2 MXene as the starting material. By doping with sodium thiosulfate and ammonia water (sulfur-doped, nitrogen-doped), the maximum emission of the obtained MQDs demonstrates entire light spectrum covering from blue to orange light. Interestingly, the as-synthesized Ti 3 C 2 MQDs aqueous solutions unveil multiple-color, excitation-independent emission wavelength and fluorescence (lifetime and quantum yield) enhancement compared with in the dry state. The fluorescence shift and enhancement are confirmed by comprehensive spectroscopic techniques (e.g. grazing incidence X-ray diffraction (GIXRD)) and complementary density functional theory (DFT) calculations. The results indicate that the construction of stalwart bridge-like hydrogen-bonded networks between the MQDs by highly ordered bound water on the doped MQDs surface can give rise to the immobilization of the C O and C–O bonds of the MQDs, thus strengthening the rigidity of the entire system. As a benefit of the bandgap emission, white light-emitting diodes (WLEDs) with stable emission color by directly utilizing MQDs as an active emission layer have been realized for the first time. As such, the as-prepared full-color MQDs developed herein can remarkably broaden the prospect of MXene 2D quantum dots (2D-QDs) in a myriad of technological applications such as electronics, batteries, bioimaging, and cancer therapy.
研究领域:
材料科学
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光学
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纳米技术
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DOI
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Fanrong Ai,Chaojun Fu,Guojun Cheng,Huanhuan Zhang,Yingchun Feng,Xiluan Yan,Xiangjuan Zheng
As an emerging zero-dimensional nanomaterial, MXene quantum dots (MQDs) have aroused the interest of researchers because of their unique physical and chemical characteristics. Here, a straightforward hydrothermal strategy was used to successfully produce the amino-functionalized Ti3C2 MQDs. The functionalized Ti3C2 MQDs exhibited bright blue fluorescence (FL), which was derived from its size effect and surface defects. In addition, Ni2+ can bind to the amino groups on the surface of Ti3C2 MQDs. The absorption of the excitation light by the light-absorbing substance causes nickel ions to effectively quench the photoluminescence of Ti3C2 MQDs, which can be explained by the internal filter effect (IFE). At the same time, the strong affinity of histidine (His) for Ni2+, which is absorbed by His to form a stable complex, causes Ni2+ to dissociate from the Ti3C2 MQD surface and restore the FL. Thus, a fluorescent sensor for detecting the His content in serum was developed. Overall, this work provides a method for the detection of His and shows that the Ti3C2 MQDs have great potential in biomedical and biosensing applications.
研究领域:
生物医学
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分析化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
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IF 5.268
Wen Luo,Huaxiao Liu,Xuan Liu,Lixiao Liu,Wenbo Zhao
MXene quantum dots have attracted much attention due to their great optical performance and excellent water solubility. Glutathione (GSH) plays a key role in living cells. In this study, a biocompatibility nanoprobe was prepared for detecting intracellular GSH based on MXene N-Ti 3 C 2 quantum dots (N-Ti 3 C 2 QDs). The N-Ti 3 C 2 QDs act as the fluorescence reporters and the ferric iron (Fe 3+ ) as the quenchers based on nonradiative electron-hole annihilation. When Fe 3+ encounters the amino group of N-Ti 3 C 2 QDs, the electrons of N-Ti 3 C 2 QDs in the excited state will transfer to the half-filled 3d orbitals of Fe 3+ , leading to the fluorescence quenching of N-Ti 3 C 2 QDs. When the N-Ti 3 C 2 QDs/Fe 3+ nanoprobe acts on the cancer cell MCF-7, the abundant GSH in the cancer cells can reduce Fe 3+ to Fe 2+ , which will restore the fluorescence of N-Ti 3 C 2 QDs. The N-Ti 3 C 2 QDs/Fe 3+ nanoprobe displays a high sensitivity for GSH with a detection limit of 0.17 μM in range of 0.5−100 μM. It becomes a promising probe for detecting and showing cellular imaging of GSH in MCF-7 cells. The N-Ti 3 C 2 QDs/Fe 3+ nanoprobe might provide a new way for imaging-guided precision cancer diagnosis.
研究领域:
生物化学
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医学诊断
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材料科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Yefeng Feng,Furong Zhou,Yanmin Dai,Zhichao Xu,Qihuang Deng,Cheng Peng
Graphene nanosheets are widely employed for fabricating high-dielectric-constant polymer nanocomposites for energy storage. However, severely reduced electric breakdown strengths of composites with increasing graphene content limit their high-field applications. To improve breakdown strengths of polyvinylidene fluoride/graphene composites without sacrificing dielectric constants, in this work, we proposed a rational strategy of constructing MXene quantum dot inter-layers for preparing ternary composites with desirable electric properties, owing to inter-layer induced quantum confinement and Coulomb blockade effects. Graphene oxide@nitrogen-doped Ti 3 C 2 MXene quantum-dot hybrid nanoparticles were synthesized via hydrogen-bond induced self-assembly route. Binary polymer/graphene and ternary polymer/hybrid-particle nanocomposite films were fabricated by solution cast process. Compared with binary composites, ternary counterparts have synergistically improved dielectric constants and breakdown strengths. Repeated disorder-bounce of electrons and strong coupling between electrons and holes, inside each quantum dot, might be responsible for superior electric performances of ternary composites. High dielectric constant (~53@1 kHz) and breakdown strength (~205 MV m −1 ) were realized in ternary composite with 0.12 wt % of nanoparticles . This work might pave a road for large-scale fabrication of high-performance nanocomposite dielectrics for energy storage.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Chao Deng,Zhaochuan Yu,Fangyuan Liang,Yuqian Liu,Farzad Seidi,Qiang Yong,Chao Liu,Yinjiang Zhang,Jingquan Han,Huining Xiao
In medical, healthcare, and packaging industries, antibacterial textiles are widely used. However, contamination of textiles with bacteria can result in exclusive cross-infection. To address this issue, we devised an engineering strategy for creating organic–inorganic hybrid layers on the surface of fiber materials by combining MXene quantum dots (MQDs) with highly efficient antimicrobial agents, endowing the textiles with dual functions of bacterial killing and monitoring. Surface-functionalized MQDs were anchored on the surface of cellulose nonwovens (CNWs) by hydrogen bonding (MQDs@CNWs), followed by immobilization of Ni 2+ ions by metal affinity coordination (Ni@MQDs@CNWs). In the last step, the antimicrobial compounds with catechol moieties were coordinated with Ni 2+ to produce the modified textile named as NCA@Ni@MQDs@CNWs. Fluorescence (FL) recovery experiments demonstrated that NCA@Ni@MQDs@CNWs had differential FL recovery ability after exposure to pathogens with different concentrations indicating its ability for bacteria monitoring. Moreover, NCA@Ni@MQDs@CNWs exhibited excellent bactericidal efficiencies of >99.99% against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) in a 30-min. This work presents a novel approach for design and fabrication of biocidal textiles with ability of sensing bacteria.
研究领域:
材料科学
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生物医学工程
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纺织科学
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产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 41
·19579-19585
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IF 7.233
Zheng Guo,Xiaohua Zhu,Shigong Wang,Chunyang Lei,Yan Huang,Zhou Nie,Shouzhuo Yao
As an emerging two-dimensional material, MXenes have attracted much attention due to their unique physicochemical properties, but their application in biosensing has been lagging far behind because of their poor salt tolerance. Herein, a titanium carbide MXene quantum dot (Ti3C2 QD)-based fluorescent probe for the alkaline phosphatase (ALP) activity assay and embryonic stem cell (ESC) identification was developed by taking advantage of the inner filter effect (IFE). Ti3C2 QDs with ∼4.2 nm in diameter were prepared from Ti3C2 MXenes by hydrothermal treatment, exhibiting excellent salt tolerance, anti-photobleaching and dispersion stability in aqueous solution. Owing to the remarkable overlap between the absorption spectrum of p-nitrophenol (p-NP) and the excitation and emission spectrum of Ti3C2 QDs, p-NP generated from ALP-catalyzed dephosphorylation of the substrate, p-nitrophenyl phosphate (p-NPP), can effectively quench the fluorescence of Ti3C2 QDs through the IFE. As a result, sensitive fluorometric analysis of ALP activity was achieved without complicating the conventional colorimetric ALP detection system. The proposed assay was successfully applied to determine ALP activity with a low limit of detection (0.02 U L−1) as well as monitoring the enzyme activity in real time. Finally, accurate analysis of ALP, the biomarker of ESC, in ESC lysates was also achieved using this IFE-based method, affording an alternative method for ESC identification.
研究领域:
生物传感
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分析化学
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细胞生物学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Tianyao Wang,Yu Wang,You Zeng,Xingguo Tian,Xiaoyan Xu
Histamine is a highly toxic biogenic amine in food, making its sensitive and rapid detection methods vital for the assurance of edible safety and human health. Here, we explored for the first time a smartphone-enabled ratiometric imprinted fluorescence sensor based on blue/orange MXene quantum dots (MQDs) for fluorescence and visual detection of histamine. A linear relationship between the concentration of histamine and the fluorescence response of the sensor was found in the range of 1–60 μM with a limit of detection (LOD) of 21.9 nM for fluorescence detection and 92.2 nM for visual detection. In addition, the method was validated for the detection of real samples with excellent recoveries from 96.52% to 105.32%. Therefore, this work greatly expands the application of MQDs in the fluorescence sensing field, as well as provides a visual strategy for in-situ detection of histamine in food.
研究领域:
食品科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Qiang Xue,Wenqiao Meng,Yi Li,Qing Fang,Kaisong Zhang
The traditional 2D nanosheets, given its relatively large size, has obstacles in water transmission and may also cause non-selective defects in polyamide membranes. To account for size effects, we successfully synthesized MXene quantum dots (MQDs) with ultra-small size through simple hydrothermal reaction, which were then utilized to construct MQDs polyamide nanofiltration membranes. Compared to the blank membrane, the MQDs membranes prepared obtained remarkable improvements in permeance and salt rejection, achieving a water permeance of 16.3 Lm −2 h −1 bar −1 and Na 2 SO 4 rejection of 98.2%. Furthermore, MQDs membranes demonstrate exceptional antifouling properties and long-term performance stability. Molecular simulation reveals that the incorporation of MQDs effectively restricts the diffusion of piperazine (PIP) into the organic phase, thereby forming a loose membrane structure. Simulation of the transport process confirms that the loose membrane structure is more conducive to water transport, and exhibits reduced contact force between bovine serum albumin (BSA) pollutants and the surface of MQDs membranes. This work sheds light on high-performance nanofiltration via MQDs-regulated interfacial polymerization strategy.
研究领域:
材料科学
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环境工程
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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）