INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Guohui Li,Kun Jiang,Sher Zaman,Jinnan Xuan,Zhiqiang Wang,Fengxia Geng
Tuning the feature sizes and surface moiety groups of a two-dimensional (2D) sheet material has been regarded as the most effective strategy for achieving desired physical and chemical properties. The newly emerging transition-metal carbide or nitride sheets, generally referred to as MXenes, are of interest to the research community owing to their versatile behavior. While the chemical stability of MXenes is of pivotal importance to their real applications, a systematic study of examining the effect of their surface and lateral size on the resulting chemical stability is still lacking. Herein, by systematically varying the synthesis parameters, we obtained both regular and ultrasmall Ti3C2 sheets with different surfaces, namely, Al oxyanions or OH/F. To investigate the chemical stability and sustainability of each Ti3C2 sheet in an oxidizing environment, including an ambient atmosphere and a H2O2 medium, the evolution of phase, morphology, and optical behavior was carefully studied. The sheets covered with Al oxyanions had greater structural stability than those covered with the other species considered in this study, which may be due to the Al oxyanions acting like a shield and passivating the surface in the oxidizing atmosphere. Regarding the effect of feature size, thinner sheets or those with smaller lateral dimensions showed improved oxidation resistance, which could be due to the difficulty encountered in the structural recrystallization from Ti3C2 to oxidized product TiO2. This study provides a deeper understanding of MXenes and a method to efficiently engineer structures with desired performances.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2025
·
IF 4.7
Jinnan Xuan,Shuxian Hou,Yuqiang Han,Chen Li,Yisi Liu,Zhong Li,Xixia Liu,Guoqiang Yang,Xinxin Liu,Jiantao Wang,Yuting Huang,Jun Wang,Wei Lai
Multidrug-resistant bacterial infections have emerged as a global public health crisis due to antibiotic misuse. In this study, we develop a layer-restacked 3D Ti3C2 nanostructure utilizing ice-templating. This nanostructure exhibits outstanding hydrophilicity, biocompatibility, and stability, as well as enhanced absorption, extinction coefficient, and photothermal conversion efficiency. Additionally, the layer-restacked 3D Ti3C2 nanostructure demonstrates excellent antibacterial activity against MDR Escherichia coli and MDR Staphylococcus aureus irradiated by 808 nm near-infrared light (NIR). Specifically, the mechanism of photothermal action against multidrug-resistant bacteria involves structural damage to the bacterial membranes, leading to the leakage of bacterial contents after layer-restacked 3D Ti3C2 nanostructures adhered under NIR irradiation. The results of transcriptome analysis show that the 3D Ti3C2 nanostructure regulates the membrane transporters and membrane transporter proteins on the bacterial cell membrane as well as the activities of enzymes associated with them, which in turn affect the metabolic processes of organic acids and other organic substances in the bacterial cell. The DNA-binding transcriptional activator EvgA is significantly downregulated, which may play a crucial role in inhibiting the emergence of drug resistance in bacteria when exposed to the layer-restacked 3D Ti3C2 nanostructure. The layer-restacked 3D Ti3C2 nanostructure is an effective photothermal antimicrobial nanostructure against multidrug-resistant bacteria.
研究领域:
材料科学
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微生物学
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医学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2015
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IF 2.489
Yupeng Gao,Libo Wang,Aiguo Zhou,Zhengyang Li,Jingkuo Chen,Hari Bala,Qianku Hu,Xinxin Cao
TiO 2 /Ti 3 C 2 nanocomposites with high photocatalytic activity were successfully fabricated via a hydrothermal process. The microstructure and phase composition of these composites were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). The photocatalytic performance of pure TiO 2 and TiO 2 /Ti 3 C 2 nanocomposites were evaluated by photodegradation of methyl orange (MO) under ultraviolet light irradiation. Photodegradation tests results revealed that TiO 2 /Ti 3 C 2 have much better photocatalytic activity than pure TiO 2 nanomaterials . And it was suggested that the TiO 2 /Ti 3 C 2 exhibited more effective electron–hole separation than pure TiO 2 and Ti 3 C 2 under UV light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Li Zhang,Qing Shu,Qiong Wu,Xuyao Xing
In this study, SnS 2 /Ti 3 C 2 was synthesized by combining SnS 2 (synthesized via oil bath method) with Ti 3 C 2 (prepared from etching of Al layers from Ti 3 AlC 2 MAX phase). The morphology, structure and photochemical properties of the catalyst were analyzed by various characterization methods. The photocatalytic performance of sample was studied by the degradation of Rhodamine B (RhB) under xenon lamp irradiation. Results showed that SnS 2 /Ti 3 C 2 could achieve 99 % photocatalytic degradation of RhB within 60 min, which was much higher than the 38 % photocatalytic degradation of SnS 2 . In addition, the RhB degradation rate of SnS 2 /Ti 3 C 2 still reached 93 % after 5 cycles. The excellent photocatalytic activity and durability were mainly attributed to the formation of Schottky heterojunction between SnS 2 and Ti 3 C 2 , which was very advantageous for efficiently separating and transferring charge carriers. The work functions of SnS 2 and Ti 3 C 2 Tx were calculated through the DFT calculations, which were 5.22 eV and 5.69 eV respectively. According to barder charge analysis, the charge transfer between SnS 2 and Ti 3 C 2 was 0.04 e. Meanwhile, radical trapping experiments confirmed that h + and •O 2− were the main active species in the reaction system. As a visible light-responsive catalyst, SnS 2 /Ti 3 C 2 could be effectively applied to the degradation of organic dye pollutants, and which has broad application prospects.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Mengting Jiang,Liwen He,Chao Duan,Xiaoping Ouyang
Poor fracture toughness is a major limitation of SiC ceramics, which greatly affects their application range. Herein, a novel strategy is proposed to enhance the fracture toughness of SiC ceramics by cross-linking carbon nanotubes (CNTs) coated with polydopamine (PDA) to Ti 3 C 2 modified with 3-glycidyloxypropyltrime-thoxysilane (KH560) (PDA-CNTs@f-Ti 3 C 2 ). Then, PDA-CNTs@f-Ti 3 C 2 was added to SiC powder to prepare the final composite. The influence of PDA-CNTs@f-Ti 3 C 2 addition on the microstructure and mechanical properties of the SiC composite is discussed. The results showed that, compared with CNTs and Ti 3 C 2 , the PDA-CNTs@f-Ti 3 C 2 composites exhibited better dispersibility in water. The flexural strength was significantly enhanced (~89%) in the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 , from 228.99 MPa to 433.55 MPa. The fracture toughness of the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 improved by 62%, from 3.97 MPa/m 1/2 to 6.44 MPa/m 1/2 .
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
Applied Materials Today
·
2020
·
IF 8.352
Gongchang Zeng,Ying Cao,Yixiao Wu,Haiguang Yuan,Biaojun Zhang,Yanling Wang,Heping Zeng,Shaobin Huang
Photocatalytic hydrogen evolution is a developing technology that addresses the urgent energy shortage, without greenhouse gas emissions. Despite tremendous efforts over the past decades, the achievement of high-efficiency hydrogen evolution rates for application in semiconductors remains very challenging because of various factors, which include low charge mobility, low light absorption, and high charge carrier recombination. Nowadays, the built-in electric field of metal-semiconductor Schottky junctions exhibits significant developments to overcome the aforementioned limitations because of the enhanced charge separation and transportation efficiency. However, noble metals are scarce and unaffordable to limit the applications. As a promising alternative, the Ti 3 C 2 nanosheets showed excellent metal conductivity which is fascinating. A new Cd 0.5 Zn 0.5 S/Ti 3 C 2 composite was fabricated as a non-noble metal-based Schottky junction photocatalyst with enhanced H 2 production performance. For a practical exploration, this study expands its application in the realistic environment of natural seawater, which is not only more in line with the sustainable concept but also greatly alleviates the issue of limited freshwater. At present, due to the complex composition of seawater, only a few studies focus on the H 2 production of seawater. Remarkably, based on the rational design of the Cd 0.5 Zn 0.5 S/Ti 3 C 2 Schottky catalyst, the observed H 2 production rate of 9.071 mmol g −1 h −1 is thirty-three times higher than that of traditional Pt assisted photocatalyst in seawater.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 3
·542
·
IF 5.719
Liqin Yang,Zhihong Chen,Xin Wang,Mingliang Jin
The practical application of photocatalytic H2-evolution is greatly limited by its sluggish charge separation, insufficient active sites, and stability of photocatalysts. Zero-dimensional (0D) Ti3C2MXene quantum dots (MQDs) and amorphous Ti(IV) have been proven to be potential substitutes for noble co-catalyst to accelerate the separation of photogenerated electron-hole pairs and prevent the self-oxidation of photocatalysts, leading to better photocatalytic H2-evolution performance with long-term stability. In this study, amorphous Ti(IV) and MQDs co-catalysts were successfully deposited on ZnIn2S4(ZIS) microspheres composed of ultra-thin nanosheets via a simple impregnation and self-assembly method (denoted as MQDs/ZIS/Ti(IV)). As expected, the optimal MQDs/ZIS/Ti(IV) sample exhibited a photocatalytic H2-evolution rate of 7.52 mmol·g−1·h−1and excellent photostability without metallic Pt as the co-catalyst in the presence of Na2S/Na2SO3as hole scavenger, about 16, 4.02 and 4.25 times higher than those of ZIS, ZIS/Ti(IV), and MQDs/ZIS, respectively. The significantly enhanced photocatalytic H2-evolution activity is attributed to the synergistic effect of the three-dimensional (3D) flower-like microsphere structure, the amorphous Ti(IV) hole co-catalyst, and a Schottky junction formed at the ZIS–MQDs interface, which offers more active sites, suppresses self-photocorrosion, and photo-generates the charge recombination of ZIS.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Lin Cheng,Yuncheng Tang,Min Xie,Yitong Sun,Hong Liu
Two-dimensional (2D) nanomaterials , especially 2D ultrathin layered nanomaterials, have been under increasing demand for solar energy usage and conversion owing to their unique characteristics such as large surface area, easily accessible catalytic sites and high electron transfer efficiency. In this work, layered Ti 3 C 2 was used as the noble-metal-free cocatalyst to design 2D/2D composite by a simple electrostatic self-assembly process, which was based on the ultrathin nickel metal organic framework (UNiMOF) nanosheets. Thanks to the similar layered structures, a conductive and intimate interface formed between Ti 3 C 2 and UNiMOF, which could promote the charge transfer and accelerate the separation of photoexcited electrons and holes. Thus, the obtained 2D/2D UNiMOF/Ti 3 C 2 hybrids exhibited higher activity for photocatalytic degradation of methylene blue (MB) than bare UNiMOF under UV–vis light irradiation, and the activity was boosted by almost 4.0 times when loaded with 1.5 wt% Ti 3 C 2 . Moreover, the as-synthesized UNiMOF/Ti 3 C 2 composites showed excellent stability. The possible mechanism for photocatalytic degradation of MB was also explored.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qingsong Zhu,Xinyu Lei,Xiaoqin Zha,Saad Melhi,Juanna Ren,Ben Bin Xu,Siyu Hao,Baoji Miao,Huitan Fu,Mohammed A. Amin,Zeinhom M. El-Bahy,Zhanhu Guo
2D MXene can prevent the penetration of corrosive media and can contribute to the improvement of corrosion resistance performance. However, achieving its uniform dispersion in the polymer matrix is challenging due to its large specific surface area and rapid aggregation. In this study, stable dispersion of polydopamine functionalized Ti 3 C 2 MXene (PDA-TM) hybrid in the waterborne epoxy (WEP) matrix was achieved via in-situ polymerization of the PDA layer on the surface of TM. The Fourier-transform infrared (FTIR) spectrum of PDA-TM showed the blue shift of O-H bond at 3438 cm −1 and the Ti-O bond of TM at 612 cm −1 . The characteristic peak of PDA-TM in the XRD pattern appeared at 2θ = 3.9° and the PDA bulge became smaller. Both proved the successful synthesis of PDA and TM. The surface wrinkles of the PDA-TM of SEM became more pronounced, and the smooth surface became rougher. This was due to the in-situ polymerization of DA on the surface of TM, which was conducive to avoid tight stacking of TM and expand its interlayer spacing. In addition, The WEP nanocomposite coating showed high impact resistance, strong adhesion, flexibility, and wear resistance. Moreover, PDA-TM decreased the glass transition temperature of WEP from 128.0 to 95.4 °C and improved the reflection loss for electromagnetic wave absorption properties. Furthermore, the |Z| 0.01Hz value of the PDA-TM 0.5 % (6.072 × 10 5 Ω cm 2 ) coating was approximately 6 times higher compared to that of the WEP coating after 30-d immersion in 3.5 wt% NaCl solution. The friction coefficient was also a quarter of neat WEP. This indicated that embedding a small amount of PDA functionalized TM nanosheets into WEP coating could improve obviously the corrosion resistance and wear resistance properties. The present research will provide a theoretical basis for the use of TM in the field of anticorrosion and electromagnetic wave absorption.
研究领域:
材料科学
·
化学工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Taotao Qiang,Boqiang Qiu,Lu Chen,Longfang Ren
In this work, a novel adsorbent for the removal of hexavalent chromium (Cr(VI)) in aqueous solution was successfully prepared by altering the 2D Ti 3 C 2 /chitosan composite with disodium ethylenediaminetetraacetate (EDTA·2Na) agent. The successful surface loading of chitosan on Ti 3 C 2 was demonstrated by various characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The adsorption of Cr(VI) by Ti 3 C 2 -based composite under various circumstances was evaluated using batch adsorption experiments. The adsorption performance of the optimal sample for Cr(VI) was investigated in detail through different influencing factors, and the adsorption process was analyzed by adsorption kinetics and isotherm model. In addition, XPS analysis of adsorbents before and after adsorption showed that some Cr(VI) was reduced to Cr(III) during the whole process, which was conducive to reducing the biological toxicity of Cr(VI). The mechanism analysis showed that the adsorption was mainly electrostatic physical adsorption, supplemented by chemical reduction adsorption. Finally, through the regeneration cycle experiment, it was found that the adsorption rate of Cr(VI) remained above 80% after six repeated adsorptions, indicating that the composite material had good stability and might have certain practical application value in the treatment of Cr(VI)-containing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Kun Wang,Youfu Zhou,Wentao Xu,Decai Huang,Zhiguang Wang,Maochun Hong
Two-dimensional Ti 3 C 2 nanosheets were obtained by exfoliation of synthesized Ti 3 AlC 2 powders in 40% HF solution at room temperature. The influence of etching time on the synthesis, structural evolution during heating, and thermal stability of as-prepared Ti 3 C 2 nanosheets were studied. The graphene-like structure of as-prepared Ti 3 C 2 nanosheets was confirmed by XRD and SEM. TG–DTA and elemental analysis suggested that the OH and F groups attached on the surface of Ti 3 C 2 nanosheets could be eliminated by heat treatment. It is noteworthy that Ti 3 C 2 nanosheets are thermal stable up to 1200 °C in Ar atmosphere. In the heating process, a small quantity of TiO 2 anatase emerges at 500 °C and then reacts with Ti 3 C 2 to form a solid solution of TiC x O 1− x (0< x <1) with the increase of temperature.
研究领域:
材料科学
·
纳米科技
·
无机化学
·
固体化学
·
热分析
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Wenhui Ji,Xiaohong Ji,Lin Cao,Qing Yu,Wei Wang
Here, we developed a novel type of composite coating with excellent self-healing and anti-corrosion properties, activated by photothermally responsive nanofillers. The photothermal heterojunction Ag 2 S@Ti 3 C 2 was synthesized and functionalized with a silane coupling agent, and subsequently incorporated into an epoxy resin containing Diels-Alder (DA) bonds. It is found that the heterojunction enhances the light absorption, increases the number and lifetime of photogenerated electron-hole pairs, and facilitates the passage of photogenerated charges through the heterojunction interface, thereby reducing interface transfer resistance and releasing heat. Under irradiation with 808 nm near-infrared light, the photothermal effect of Silane-Ag 2 S@Ti 3 C 2 triggers molecular chain movement and dynamic DA bond reconstruction, thereby repairing scratches in the coating. Surface characterization and electrochemical tests indicate that the coating containing 1 wt% Silane-Ag 2 S@Ti 3 C 2 nanofillers exhibits significant self-healing and anti-corrosion properties. The self-healing rate of the coating approached nearly 96.00 %. After five self-healing cycles, the protective performance of the initial immersion stage was effectively restored, the self-healing rate remained at about 90.00 %. Even after 60 d of immersion, the low-frequency impedance modulus remained above 10 8 Ω·cm 2 . This study presents a novel strategy for the development of multi-cycle self-healing coatings utilizing photothermal effects.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）