Materials Today Chemistry
·
2023
·
IF 7.3
S. Jiang,H. Zhang,Z. Li,L. Chen,L. Yin,X. Liu
Non-invasive sweat detectors can monitor the glucose level of diabetes in a painless way. However, most detectors need to collect enough sweat through external exercise or active stimulation, which increases the inconvenience of the user and reduces the applicable population. In this study, we propose an ultra-sensitive biomimetic glucose detector to detect the sweat produced by thermoregulation without additional exercise and stimulation. Inspired by the predator process of sponge in the sea, the sensing material of MXene (Ti 3 C 2 T x ) @CeO 2 hydrogels employed the “laminae-trestle-laminae” (L-T-L) structure of sponge to adsorb and transport glucose molecules in sweat. CeO 2 grafted onto the MXene surface can detect glucose by the catalytic activity of CeO 2 . The glucose detector with an ultra-low limit of detection (LOD = 0.004 μM), excellent sensitivity (801.27 μA⋅μM − 1 ⋅cm − 2 ), and a broad linear detection range (LDR = 0.01–2.5 μM) can satisfy detection requirements in human sweat after dilution. In real applications, the detector can detect glucose in the sweat of diabetic patients for five consecutive days and detect the glucose content in the daily drinks of patients. Our findings demonstrate the high potential of sponge-inspired MXene@CeO 2 glucose detector for routine medical testing.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zejun Zhang,Yunxiu Sun,Baoli Wang,Yijing Ai,Fan Shi,Yucen Yao,Xueliang Niu,Wei Sun
A novel sensing system was constructed by using gold nanoparticles (AuNPs) and MXene-Ti 3 C 2 T x nanocomposite decorated glassy carbon electrode (GCE) for dopamine (DA) determination. The AuNPs/MXene nanocomposite was prepared via a drop coating method, which could appreciably enlarge the electrochemically active surface area of as-prepared sensor and promote electron transfer with the enhanced electrochemical signals. Applying AuNPs/MXene/GCE in the optimum conditions, differential pulse voltammetric (DPV) current responses vs. DA concentrations are linear in the wider range of 2.0-500.0 μmol/L along with low detection limit of 0.67 μmol/L (S/N=3). Moreover, the proposed AuNPs/MXene modified GCE exhibited excellent stability, selectivity and reproducibility. Finally, this sensor had been utilized to detect DA successfully in DA hydrochloride injection with satisfactory recoveries, providing a promising application for further sensing analysis.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kangqi Chang,Jian Meng,Minhao Guo,Le Li,Tianxi Liu,Yunpeng Huang
The potential applications of wearable pressure sensors in portable electronics and artificial intelligence have generated tremendous research attention. However, developing pressure sensors with high sensitivity, rapid response, superb stability, and great dressing comfort remains a significant challenge. Herein, a flexible and breathable pressure sensor is developed on a cotton/spandex fabric via a simple sonication-assisted assembly of MXene and subsequent device packaging. Obtained MXene/cotton/spandex fabric (MCSF) pressure sensor achieves a high sensitivity of 0.1891 kPa −1 , a low-pressure detection limit of 500 Pa, a wide working range of 0–100 kPa, rapid response/recovery times of 50/90 ms, as well as an outstanding durability of 5000 cycles. Furthermore, the inherent porosity of the fabric substrates allows free transmission of air and moisture from the skin, ensuring long-term wearing comfort of the sensor. More importantly, the MCSF sensor also demonstrates real-time monitoring capability for various human motion signals including wrist pulse, phonation, and joint motions. And a step further, an integrated sensory array is successfully applied for recognizing different tactile stimuli. It is anticipated that this fabric pressure sensor will find applications in wearable motion monitoring electronics and human–computer interaction devices.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Wenjuan Zhang,Yuheng Li,Yaxian Wang,Youliang Wang,Miao Kou,Xiangyue Yang,Qianqian Chu,Kun Zhao
An efficient route is proposed to synthesize a novel three-dimensional (3D) magnetic MXene aerogel (3D MXene/Fe 3 O 4 ). 3D MXene were synthesized by self-assembly of 2D MXene Ti 3 C 2 T x using ethylenediamine (EDA) as crosslinking inducer, then Fe 3 O 4 was in situ coprecipitation onto 3D MXene. 3D MXene/Fe 3 O 4 was applied as an adsorbent for Ag(I) removal from aqueous solutions. 3D MXene/Fe 3 O 4 exhibits a cross-linked 3D porous network with magnetic Fe 3 O 4 nanoparticles uniformly dispersed on its surface and edges. The maximum adsorption capacity of 3D MXene/Fe 3 O 4 for Ag(I) was 2385 mg g −1 . The kinetics and isothermal process during adsorption were described accurately by the pseudo-second-order model and the Freundlich isotherm model, and the adsorption process was driven by chemisorption and multilayer adsorption, where the diffusion mechanism involved surface diffusion and intraparticle diffusion. Furthermore, the 3D MXene/Fe 3 O 4 are recyclable, retaining 71% of the initial removal rate after 5 adsorption/desorption cycles.
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SmartMat
·
2023
·
IF 20.4
Jiahui Huang,Xianwu Huang,Peiyi Wu
Booming sophisticated robotics and prosthetics put forward high requirements on soft conductive materials that can bridge electronics and biology, those soft conductive materials should imitate the mechanical properties of biological tissues and build information transmission networks. Until now, it remains a great challenge to handle the trade-off among ease of preparation, high conductivity, processability, mechanical adaptability, and external stimuli responsiveness. Herein, a kind of readily prepared and processed multifunctional MXene nanocomposite hydrogel is reported, which is prepared via the fast gelation of cationic monomer initiated by delaminated MXene sheets. The gelation time can be adjusted (several seconds to minutes) based on the MXene loadings. By adjusting the MXene ratio, the resulting nanocomposites are ultrastretchable (>5000%), three-dimensional (3D) printable, and show outstanding mechanical and electrical self-healing. As expected, the integration of multifunctional systems onto various substrates (e.g., gloves and masks) is further demonstrated via 3D printing and could achieve diverse sensory capabilities toward strain, pressure, and temperature, showing great prospects as smart flexible electronics.
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LANGMUIR
·
2023
·
IF 3.9
Qing Qing,Xian-ying Shi,Shao-zhong Hu,Liang Li,Ting Huang,Nan Zhang,Yong Wang
Increasing environmental problems intensify the demand for high-performance environmental purification materials. MXene is a typical transition-metal carbide/nitride material with a two-dimensional geometric feature and a good deal of functional groups, and it is considered as an efficient adsorbent for removing pollutants from wastewater. However, the easy oxidation and relatively low adsorption capacity greatly restrict its application. In this study, the MXene/polydopamine (PDA) composite particles were fabricated through the biomimetic modification method of inducing the self-polymerization of dopamine in an MXene aqueous solution. Microstructure characterizations demonstrate that PDA facilitates the exfoliation of MXene. Adsorption measurements show that MXene and PDA exhibit an apparent synergistic effect in removing chromium hexavalent Cr(VI) from aqueous solution, and more PDA content leads to a larger synergistic effect. Consequently, the composite particles exhibit an ultrahigh adsorption capacity (862.3 mg/g). Specifically, even if the composite particles were stored in aqueous solution for 2 months, they still exhibit high adsorption ability with only a 3.3% loss in adsorption capacity, indirectly confirming the enhanced stability of MXene induced by PDA. Furthermore, the composite particles also show reduction ability to Cr(VI) and about 54.3% Cr(VI) can be reduced to harmless chromium trivalent Cr(III). This study provides a new method for the preparation of MXene-based adsorbents with excellent adsorption capacity and high stability, which has broad application prospects in the field of wastewater treatment.
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PubMed
高影响因子
Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-16
·
IF 26.6
Wu Fushuo,Hu Peiying,Hu Feiyue,Tian Zhihua,Tang Jingwen,Zhang Peigen,Pan Long,Barsoum Michel W.,Cai Longzhu,Sun ZhengMing
Curving 2D MXene into 1D nanofibers can effectively stop the restacking of MXene flakes, and then the nanofibers are used to construct a lightweight and multifunctional MXene/C aerogel.
The MXene/C aerogels achieved an RL min of − 53.02 dB and EAB of 5.3 GHz. The radar cross-sectional reduction value of MXene/C aerogels can reach 12.02 dB m 2 .
Integrating multiple functions such as thermal insulation, sensing, and microwave absorption into one material—MXene/C aerogel.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 19
·10051-10063
·
IF 4.4
Nie Chenxin,Yang Jian,Deng Guojun,Feng Yuezhan,Shi Yongqian
A new N–P–Cu containing supermolecular assembly network (MPCSN) was fabricated with titanium carbide (Ti 3 C 2 T x ) nanosheets through intermolecular forces, and then, the flame-retardant thermoplastic polyurethane (TPU) nanocomposites were synthesized by melt blending. The obtained results of the TPU/Ti 3 C 2 T x -MPCSN system indicated that the temperature corresponding to T 5% of TPU nanocomposites by adding 2% Ti 3 C 2 T x or 2% MPCSN decreased to 269.1 and 311.5 °C, respectively. Simultaneously, a well dispersion of the loading of 1.0 mass% Ti 3 C 2 T x -MPCSN was found in TPU matrix. Accordingly, the thermal stability of TPU can be found to be substantially improved in the thermogravimetric analysis, which was embodied in the mass loss of TPU/Ti 3 C 2 T x -MPCSN-1.0 reached up to 8.47 mass%. Moreover, the cone calorimeter tests revealed that the peak of heat release rate, the total heat release, carbon monoxide production rate and total carbon monoxide yield of the TPU nanocomposite were prominently diminished by 16.1%, 37.5%, 18.8% and 37.6%, respectively. This provides clues to the flame-retardant mechanism of TPU nanocomposites: The modified Ti 3 C 2 T x is combined with MPCSN through a cross-linked network grown on the surface of the carbon layer, which not only prevents the leakage of combustible gas, but also catalyzes the formation of the carbon layer. This work demonstrates a novel design for improved Ti 3 C 2 T x with supramolecularly assembled networks to reduce potential fire risk in practical TPU applications, applying to applications in polymer materials.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaohui Sun,Xueying Zhao,Xuyang Zhang,Guohua Wu,Xianhui Rong,Xiangwei Wang
Ti3C2Tx MXene is a potential microwave absorption material due to its unique physical and chemical properties. However, the impedance mismatch of MXene results in low microwave absorption. In this work, 2D/2D MXene@TiO2 composites were synthesized via a simple hydrothermal oxidation method, TiO2 is derived in situ from MXene without adding any additional Ti precursors. TiO2 with low permittivity can effectively regulate the impedance matching and enhance loss mechanisms. The MXene@TiO2-6 h composite shows a reflection loss (RL) of −58.3 dB at 11.36 GHz with a thickness of 1.75 mm, and the maximum effective absorption bandwidth (EAB) is 4.08 GHz (13.92–18 GHz) at 1.26 mm. Furthermore, the 2D/2D composite can obtain efficient microwave absorption at different frequencies by adjusting the thickness; RL can reach −39.1 dB at 5.04 GHz with a thickness of 3.5 mm. The radar cross section (RCS) of MXene@TiO2-6 h is lower than −19 dB m2 at −60–60°, and the minimum RCS is −56 dB m2 at 15°. This work provides a valuable experience in developing microwave absorption materials.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 11
·3631-3643
·
IF 3.4
Lei Li,Yishen Chen,Xuejun Lai,Hongqiang Li,Xingrong Zeng
Phosphorus-nitrogen intumescent flame retardant (IFR) is one of the most promising halogen-free flame retardants in enhancing the fire safety of polypropylene (PP), but its efficiency needs to be further improved. Herein, a novel single-component polyphosphazene IFR containing pentaerythritol caged phosphate (PEPA) functionalized titanium carbide nanosheet (MXene), named PZS-MXene, was prepared. When the amount of PZS-MXene was 25 wt%, PP/PZS-MXene classed a UL-94 V-0 rating with the limiting oxygen index of 32.7%. Compared with PP, its peak of heat release rate, total heat release rate and total smoke production rate were reduced by 74.5%, 33.0%, and 19.8%, respectively. The flame-retardant mechanism revealed that PZS-MXene quenched high-active free radicals to inhibit the degradation of PP during the combustion. MXene rapidly catalyzed the carbonization of PZS to form high-quality intumescent char layer on its surface. Besides, MXene acted as the supporting skeletons and exerted the layered barrier effect to improve the compactness of the intumescent char layer, thus effectively inhibited the degradation and combustion of PP. This work provided new insights for the efficient halogen-free flame-retardant PP.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 42
·19957-19971
·
IF 4.682
Zhu Beibei,Song Pingan,Li Jingguo,Cao Shaokui,Shi Jun
Photodynamic therapy as an antibiotic-free method could effectively solve the bacterial infection problem and avoid the emergence of multidrug-resistant bacteria. In this paper, Ti 3 C 2 @gold nanorods (GNRs)/PDA nanoparticles with synergistic photodynamic antibacterial properties were obtained by coating PDA on the surface of in situ growth Ti 3 C 2 @GNRs. GNRs growing on the surface of Ti 3 C 2 MXene nanosheets effectively prevented the aggregation of Ti 3 C 2 nanosheets, which ensured the distinct photodynamic antibacterial performance of Ti 3 C 2 . In addition, the introduction of SH-PEG-CH 3 to Ti 3 C 2 @GNRs nanosheets endowed Ti 3 C 2 @GNRs/PDA nanoparticles with good biocompatibility. Furthermore, Ti 3 C 2 @GNRs/PDA nanoparticles possessed synergistically enhanced photodynamic properties, caused by the remarkable photodynamic properties of Ti 3 C 2 MXene and PDA. In addition, with the increase in PDA content, Ti 3 C 2 @GNRs/PDA nanoparticles could produce more 1 O 2 under 660 nm laser irradiation and the minimum inhibitory concentrations of Ti 3 C 2 @GNRs/PDA 50 nanoparticles against E. coli and S. aureus decreased to about 0.07 mg/mL. Thus, this work utilizes the 1 O 2 -generating performance of Ti 3 C 2 MXene and PDA to fabricate Ti 3 C 2 @GNRs/PDA nanoparticles with synergistically enhanced photodynamic antibacterial activities, which is expected to be applied in antibiotic-free antibacterial field. Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xianhong Zheng,Jinhao Tang,Lvzhu Cheng,Haiwei Yang,Lihua Zou,Changlong Li
The development of high-performance electromagnetic interference (EMI) shielding materials is urgently needed to mitigate electromagnetic radiation pollution. Two-dimensional transition metal carbides (MXenes) are promising EMI shielding materials because of their high metallic electrical conductivity . However, tuning the EMI shielding performance of MXene composites remains challenging via the structure engineering strategy. Herein, we develop a layer-by-layer assembling strategy to construct multilayer sandwiched hollow magnetic Fe 3 O 4 nanospheres (HFO)/MXene on flexible nonwoven fabrics . The fabricated Fe 3 O 4 /MXene composite fabrics (HFMs) exhibit low sheet resistance (4.6 Ω/□), super-hydrophobicity, self-cleaning, and good EMI shielding performance (EMI shielding effectiveness of 33.28 dB). More importantly, the EMI shielding mechanism of HFMs is tunable according to the loaded active materials. Thus, the mechanism can alternate from absorption to reflection. Moreover, the HFMs exhibit good electrothermal performance and can be used as a wearable heater for personal thermal management. This work provides a new approach for the structural design of high EMI shielding materials, and paves the way for the development of wearable electronics.
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