Small
·
2023
·Vol. 19
·期 49
·2303113
·
IF 13.3
Yan Gao,Jinjie Lin,Xiao Chen,Zhaodi Tang,Geng Qin,Ge Wang
2D MXene is highly preferred for photothermal energy conversion and microwave absorption. However, the aggregation issue, insufficient dielectric loss capacity, and lack of magnetic loss capacity for MXene severely hinder its practical applications. Herein, the authors propose multi-dimensional nanostructure engineering to electrostatically assemble 2D MXene and layered double hydroxides (LDH) derived from ZIF-67 polyhedron into a 3D hollow framework (LDH@MXene), and subsequently calcined to construct a Co nanoparticle-modified 3D hollow C-LDH@MXene framework to encapsulate a paraffin wax (PW) phase change material (PCM). The 3D hollow C-LDH@MXene framework not only prevents 2D MXene from aggregation but also contributes a high thermal energy storage density (131.04 J g −1 ). Benefiting from a 3D conductive network facilitating the rapid transport of photons and phonons from the interface to the interior and the synergistic localized surface plasmon resonance (LSPR) effect of MXene and Co magnetic nanoparticles, the C-LDH@MXene-PW composite PCM yielded a high photothermal storage efficiency of 96.52%. Besides, C-LDH@MXene-PW composite PCMs also exhibited efficient microwave absorption with a minimum reflection loss of −20.87 dB at 13.30 GHz with a matching thickness of only 2 mm. This distinctive design provides constructive references for the development of integrated composite materials for energy storage and microwave absorption.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Minglu Tang,Zhengya Yue,Jialun Li,Tiedong Sun,Chunxia Chen
Nanozymes attract widespread attention in the biomedical field owing to their catalytic activity and unique physicochemical properties, particularly for tumor catalytic therapy. Nevertheless, the complex tumor microenvironment (TME) and limited hydrogen peroxide (H2O2) restrict catalytic therapeutics by nanozymes. Enhancing the catalytic activity of nanozymes for efficient catalytic therapy is extremely meaningful for further research. Here, we report MXene-based platinum (Pt) and glucose oxidase (GOD) hybrid nanozymes (Ti3C2/Pt-GOD) for hyperthermal-enhanced cascade catalytic therapy. In this construct, the Pt nanoparticles with peroxidase-like (POD-like) and catalase-like (CAT-like) activities can catalyze H2O2 to produce reactive oxygen species (ROS) for catalytic therapy and oxygen (O2) to alleviate hypoxia simultaneously for the oxidation reaction of GOD with glucose for self-supply of H2O2. MXene as a deposition matrix coupled with photothermal properties enables photothermal therapy (PTT) and hyperthermal-enhanced catalytic therapy under near-infrared (NIR) laser. The effect of the photothermal-catalytic synergy therapy was validated both in vitro and in vivo. This construction of Ti3C2/Pt-GOD composites and hyperthermal-enhanced catalytic therapy provides a promising reference for nanozyme-mediated catalytic medicine.
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Crystals
·
2023
·Vol. 13
·期 7
·1005
·
IF 2.7
Zhiwei Liu,Guanlong Li,Yan Zhao,Xiangbao Chen
The rapid development of electronic technology has brought convenience and efficiency to the lives of modern people, while emphasizing the need for novel materials with designability and excellent dielectric properties at the same time. In this work, Ti3C2TxMXene nanosheets (MNSs) underwent NH3·H2O solvothermal treatment at temperatures of 40 °C, 60 °C, 80 °C, 100 °C, 120 °C, 140 °C, 160 °C, and 180 °C. The changes in the surface groups and dielectric properties after the solvothermal treatment were studied. The solvothermal treatment increased the proportion of surface -OH groups, which was beneficial to the permittivity of the MNSs. However, as the treating temperature increased, the amount of -OH on the surface of the MNSs showed a reducing trend, according to XPS spectra. As the treating temperature rose from 40 °C to 80 °C, the real part of the permittivity of MNS sample showed a significant decrease, eventually remaining approximately stable in the 80 °C to 180 °C samples. The results of electromagnetic characterization were in line with the group proportion, as determined via the XPS O1s spectra, supporting the previous conclusion that the -OH group played an important role in the permittivity.Keywords:NH3·H2O solvothermal;end groups;dielectric property;2D nanosheets
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Lian Yin,Kaili Gong,Haifeng Pan,Liangjie Guo,Keqing Zhou
Thermosetting epoxy resin (EP) has a high fire hazard that generates a lot of heat and toxic fumes, which is considered a prominent drawback that limits the practical application of EP. Therefore, inspired by the column-to-beam architecture, the BN-PDA-MXene nanohybrid was developed via covalent cross-linking and hydrogen bonding. The results showed that the stable column-to-beam architecture not only prevented the stacking of 2D nanosheets but also built a labyrinth-type array in the EP matrix, which was beneficial to enhancing the thermal stability and flame-retardant performance of EP composites. In particular, with the addition of the 2% BN-PDA-MXene nanohybrid, the maximum mass loss rate (MLRmax) of the EP composite was reduced and the char residue increased. Meanwhile, compared with pure EP, there was a marked reduction of 22.2% in the peak heat release rate, demonstrating the suppressed heat release. Furthermore, EP/BN-PDA-MXene had excellent smoke suppression performance, which was mainly reflected by the downward trend of the peak smoke production rate, total smoke production, and peak CO production rate, together with an obvious reduction of 39.9% in smoke factor. By studying the char residue, it was confirmed that the BN-PDA-MXene nanohybrid had a certain inhibitory effect on the fire hazard of EP due to its lamellar barrier effect, as well as the catalytic detoxification and catalytic carbonization of transition elements.
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Materials Today Sustainability
·
2022
·
IF 7.244
X. Huang,Y. Tuersun,M. Huang,W. Lin,W. Qiu,S. Chu
Efficient thermal management materials are important for the proper operation of integrated circuits. In this work, the high-yield preparation of hydroxylated boron nitride nanosheets (BNNSs) was achieved by high-temperature ablation followed by ultrasonic exfoliation without the use of highly toxic solvents. The small-sized BNNSs have similar phonon vibration properties as the large-sized MXene , and they self-assemble by electrostatic adsorption on PMMA particles to form hybrid spheres. The appearance of thermal percolation threshold indicates the successful construction of thermal conductivity pathway. The exclusion effect is more pronounced for PMMA microspheres with a larger radius, and the best thermal conductivity of 4.13 W/m·K was achieved for the composite with 20 wt% nanosheet filling. The composite exhibited good thermal performance both in the finite element model and when used as an LED heat sink. Furthermore, the incorporation of fillers can also effectively improve the thermal stability and mechanical properties of the composite. Our study provides a facile and environmental exfoliation approach of h-BN and a new strategy for the preparation of high thermal conductivity electronic packaging materials.
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ANALYST
·
2022
·Vol. 147
·期 23
·5557-5563
·
IF 5.227
Lin Mei,Yanmei Shi,Yange Shi,Pengpeng Yan,Chunlei Lin,Yue Sun,Bingjie Wei,Jing Li
Quantum dots functionalization has been proven to be a simple modification strategy for improving the electroanalytical performance of two-dimensional electrode materials by increasing the specific surface area and active reaction sites. Herein, a new electrochemical sensing platform was fabricated by SnO2 quantum dot-functionalized Ti3C2 MXene (Ti3C2-SnO2QDs) for the highly sensitive detection of Sudan I in food. Ti3C2-SnO2QDs were prepared via in situ synthesis, which can control the nucleation and growth of SnO2QDs, resulting in the well-dispersed SnO2QDs with 2–3 nm size on the intersheet surface of MXene. Moreover, the formation of Ti3C2-SnO2QDs can effectively restrict the aggregation of Ti3C2 and improve the stability of SnO2QDs in aquatic environment. The prepared nanocomposite can be used as an improved modified material to further increase the electrocatalytic performance and electrochemical signal of Sudan I on the surface of a glassy carbon electrode. Under optimized conditions, the proposed analytical method displayed a linear dependence for Sudan I concentration ranging from 0.008 to 10 μM with a detection limit of 0.27 nM (S/N = 3) by electrochemical cyclic voltammetry. This sensor with excellent selectivity, reproducibility and accuracy was quantitatively validated in commercial ketchup and chili powder. This Ti3C2-SnO2QDs-based Sudan I sensor is expected to expand the application of MXene nanocomposites in electrochemical analysis and is envisioned as a promising candidate for monitoring illegal food additives in real food samples.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuxiang Wei,Dekai Wu,Chaoyou Yong,Zhenni Wang,Peng Zhong,Jiajun Qiu,Jiatong Fan,Jie Sun,Yimin Lei,Xiaoqiang Wu
Electrocatalysts play an important role in the cathodic Oxygen Reduction Reaction (ORR) of fuel cells. Because of the high cost, poor cycle stability and methanol tolerance, the commercial Pt/C catalysts have been seriously restricted during large-scale application and development in electrochemical devices. The development of non-noble metal ORR catalysts is one of the effective ways to achieve fuel cell cost reduction and performance improvement at the same time. In this work, Ti 4 O 7 /MXene nanocomposites were synthesized through hydrothermal followed by carbothermal reduction reactions. Such catalysts exhibit large electrochemical active surface area (ECSA = 215.74 cm 2 ) and excellent ORR catalytic activity in alkaline media. The initial potential and half-wave potential were confirmed to be 0.91 V and 0.72 V with the electron transfer number of 3.3. In addition, the Ti 4 O 7 /MXene catalysts have better cyclic stability and methanol tolerance than commercial Pt/C catalyst. This study provides a new idea and method for the innovative preparation of MXene-based composite electrocatalysts.
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Biosensors-Basel
·
2022
·Vol. 12
·期 10
·865
·
IF 5.743
Yuting Qiao,Xianrong Liu,Zhi Jia,Peng Zhang,Li Gao,Bingxin Liu,Lijuan Qiao,Lei Zhang
Abnormal protein phosphorylation may relate to diseases such as Alzheimer’s, schizophrenia, and Parkinson’s. Therefore, the real-time detection of phosphoproteins in sweat was of great significance for the early knowledge, detection, and treatment of neurological diseases. In this work, anatase/rutile TiO2was in situ grown on the MXene surface to constructing the intercalation structure MXene@anatase/rutile TiO2ternary heterostructure as a sensing platform for detecting phosphoprotein in sweat. Here, the intercalation structure of MXene acted as electron and diffusion channels for phosphoproteins. The in situ grown anatase/rutile TiO2with n-n-type heterostructure provided specific adsorption sites for the phosphoproteins. The determination of phosphoprotein covered concentrations in sweat, with linear range from 0.01 to 1 mg/mL, along with a low LOD of 1.52 μM. It is worth noting that, since the macromolecular phosphoprotein was adsorbed on the surface of the material, the electrochemical signal gradually decreased with the increase of phosphoprotein concentration. In addition, the active sites in the MXene@anatase/rutile TiO2ternary heterojunction and synergistic effect of the heterojunction were verified by first-principle calculations to further realize the response to phosphoproteins. Additionally, the effective diffusion capacity and mobility of phosphoprotein molecules in the ternary heterojunction structure were studied by molecular dynamics simulation. Furthermore, the constructed sensing platform showed high selectivity, repeatability, reproducibility, and stability, and this newly developed sensor can detect for phosphoprotein in actual sweat samples. This satisfactory sensing strategy could be promoted to realize the noninvasive and continuous detection of sweat.Keywords:sweat;phosphoprotein;MXene;anatae/rutile TiO2;intercalation structure;healthcare monitoring
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Bin Yang,Lin Wang,Junfan Zhao,Ruixue Pang,Baolong Yuan,Jiaojun Tan,Shunxi Song,Jingyi Nie,Meiyun Zhang
Pressure sensors with desirable flexibility, robustness, and versatility are urgently needed for complicated smart wearable devices. However, developing an ideal multifunctional flexible sensor is still challenging. In this work, a composite aerogel film sensor with an internal three-dimensional (3D) microporous and hierarchical structure is successfully fabricated by the self-assembly of aramid nanofiber (ANF) and conductive MXene by vacuum-assisted filtration and ice crystal growth. The resultant MXene/ANF aerogel film with a mass ratio of 3/7 (30% MAAF) presents high robustness with an outstanding tensile strength of 14.1 MPa and a modulus of 455 MPa while retaining appealing flexibility and sensitive characteristics due to the 3D microstructure. Accompanied by superior electric conductivity, the MAAF sensor performs noticeably in human motion and microexpression detection with a fast response time of 100 ms and a high sensitivity of 37.4 kPa–1. In addition, MAAF exhibits considerable thermal shielding performance based on the excellent thermostability. Moreover, it possesses prominent electrothermal property with a wide heating temperature range (32.7–242 °C) in a fast thermal response time (5 s) due to the Joule effect. Additionally, a hydrophobic SiO2 coating is introduced on the surface of MAAF to further broaden the sensing application, and the obtained MAAF@SiO2 sensor shows distinguished sensing capability underwater, which can be accurately applied to swimming monitoring. Therefore, this work provides a highly flexible, lightweight, robust, and multifunctional aerogel film sensor, showing promising potential in smart wearable sensing and healthcare devices, intelligent robots, and underwater detection.
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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.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Zhiqiang Wang,Yingying Guo,Qian Zhang,Zhiyong Li,Yang Zhao,Huiyong Wang
Two-dimensional titanium carbide (Ti 3 C 2 T x ) MXene nanosheets have been widely concerned due to its abundant surface functional groups, high conductivity, excellent photoelectrochemical properties and thermal conductivity. Nevertheless, it is still a challenge for the mass production of high-quality Ti 3 C 2 T x MXene nanosheets. Herein, the bulk Ti 3 C 2 T x MXene powders were stripped into monolayer or few layer nanosheets in propylene carbonate through liquid-phase exfoliation strategy assisted via alkanolamine as intercalators. It is shown that the stripping yield is up to 59.3 %, which is the recorded value for the delamination of Ti 3 C 2 T x MXene nanosheets from bulk Ti 3 C 2 T x MXene powder, and 62.2 % of nanosheets are monolayer. The ability of hydrogen bond donor and molecular size of alkanolamine have important effects on the yield. Moreover, Ti 3 C 2 T x MXene nanosheets have been employed as catalysts in the photocatalytic CO 2 reduction. The yield of CO is 149.7 μmol g -1 h −1 , which is about five times that of bulk Ti 3 C 2 T x MXene powder. This work paves the way for the mass production of MXene nanosheets with high activity photocatalysis.
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CHEMOSPHERE
·
2022
·
IF 8.943
Hongwei Wang,Fang Wu,Zhiheng Wang,Yang Wang,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
Chromium (VI) removal is crucial to the safety of water resources, but there is still a lack of effective and fast dislodge methods, especially the on-site rapid remediation and emergency removal technology . Herein, the monolayer (ML) Ti 3 C 2 T x nanosheets (NSs) were prepared to remove Cr (VI) from water. The solution sample of the two-dimensional (2D) Ti 3 C 2 T x NSs demonstrate ultrafast adsorption kinetics (the concentration decreasing from 300 to 3 mg L −1 in 10 min) and impressively high capacity (1483 mg g −1 ), which is several times higher than that of the most reported Cr (VI) adsorption by Ti 3 C 2 T x . The analysis of the adsorption kinetics and isotherm models indicates that the adsorption reaction is endothermic, with physical and chemical adsorption coexisting (mainly monolayer chemical adsorption). The joint study of the experimental analysis and theoretical calculation based on the density functional theory (DFT) demonstrates that the extraordinary removal performance of Cr (VI) is due to the synergetic effect of reduction reaction removal and electrostatic adsorption. It is found that the Cr (VI) is mainly reduced by the OH- terminals on Ti 3 C 2 , and the detoxified Cr (III) is anchored on the surface of Ti 3 C 2 T x through complexation reaction with O terminal. The advantages of ultrafast adsorption kinetics and extra-high adsorption capacity of the single-layered Ti 3 C 2 T x for Cr (VI) removal make it a remarkable candidate for rapid and urgent removal of Cr (VI) wastewater.
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