JOURNAL OF MOLECULAR LIQUIDS
·
2024
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IF 5.3
Xu-Han Chen,Cheng-Zhen Wang,Qiu-Feng Lü
The rapid growth of industries and population has led to severe water pollution, especially from the oil and dyes pollution. Recently, MXene with hydrophilicity layer structure and excellent adsorption capacity has been regarded as a promising material for high efficiency dye adsorption and oil–water separation. In this study, aminated-SiO 2 nanorods and monolayer Ti 3 C 2 T x MXene were combined by a facile self-assembly method to prepare a new composite (NS x /MXene) for dye adsorption and oil–water separation. The results show that the adsorption capacity of the NS x /MXene composite was enhanced due to the introduction of aminated-SiO 2 nanorods with more active sites. Especially, the NS 2 /MXene composite has a maximum adsorption capacity up to 4532.5 mg g −1 for AB74 dye, which is attributed to the electrostatic interaction between NS 2 /MXene and AB74 dye molecules. In addition, NS 2 /MXene modified polyurethane sponge (NS 2 /MXene@PU) was prepared by immersing dried polyurethane (PU) sponge in the NS 2 /MXene suspension. The NS 2 /MXene@PU sponge has a characteristic of superhydrophilicity in air and superoleophobicity in water, and shows a high separation flux of 27.44 × 10 4 L m −2 h −1 for a cyclohexane-water mixture. After 30 cycle experiments, the separation flux of NS 2 /MXene@PU for the cyclohexane-water mixture can still be 21.66 × 10 4 L m −2 h −1 , indicating an excellent cycling stability of NS 2 /MXene@PU. Hence, this new NS 2 /MXene material has excellent application prospects in dye adsorption and oil–water separation.
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SENSORS
·
2024
·Vol. 24
·期 20
·6514
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IF 3.4
Baocang Zhou,Zhihua Zhao,Zhenli Lv,Zhuo Chen,Sibo Kang
The MXene Ti3C2Txwas synthesized using hydrofluoric acid and an improved multilayer method in this study. Subsequently, a Bi2O3/Ti3C2Txcomposite material was produced through hydrothermal synthesis. This composite boasts a unique layered structure, offering a large surface area that provides numerous contact and reaction sites, facilitating the adsorption of ammonia on its surface. The prepared Bi2O3/Ti3C2Tx-based sensor exhibits excellent sensing performance for ammonia gas, including high responsiveness, good repeatability, and rapid response–recovery time. The sensor’s response to 100 ppm ammonia gas is 61%, which is 11.3 times and 1.6 times the response values of the Ti3C2Txgas sensor and Bi2O3gas sensor, with response/recovery times of 61 s/164 s at room temperature, respectively. Additionally, the gas sensitivity mechanism of the Bi2O3/Ti3C2Tx-based sensor was analyzed, and the gas sensing response mechanism was proposed. This study shows that the sensor can effectively enhance the accuracy and precision of ammonia detection at room temperature and has a wide range of application scenarios.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Huiyan Wei,Xinyi Liu,Yuan Cui,Leijiao Li,Yuming Liu,Yuqin Ma,Hongji Li,Qingming Xu
Au BPs/MXene mixtures were composited with PVDF membranes by vacuum filtration, which enabled the sensitive detection. It combined electromagnetic mechanism and chemical mechanism to achieve a synergistic enhancement of the detection, resulting in a good stability of the SERS substrate. With fluorescent dyes including rhodamine 6G and methylene blue as templates for the SERS sensor, the SERS substrate possessed high sensitivity and reproducibility on account of the strong interactions between the dye molecules and the Au BPs/MXene. In addition, the photochemical performance of the composite membrane material for rhodamine 6G and methylene blue was investigated, which demonstrated the potential of AuBPs/MXene@PVDF membrane for photochemical applications. The study of the SERS detection and photochemical degradation performance of the composite membrane material in different water sources demonstrated that the excellent testing capability of the AuBPs/MXene@PVDF membrane material can be used for reliable and highly sensitive monitoring and application in water environment analysis.
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Materials Research Express
·
2024
·
IF 1.8
Pu Shi,Zhikun Wang,Fan Shi
The catalytic properties of noble metal nanoparticles can enhance the adsorption capacity of sensors for target gases when compounded with MXene. In this study, a nanocomposite of gold nanoparticles (Au NPs) and MXene was prepared using a simple self-reduction process, and its microstructure, electrochemical valence states, specific surface area, and other properties were characterized. Gas sensitivity tests conducted on the Au@MXene-20 sensor revealed excellent selectivity for NH3 at room temperature. The response value to 100 ppm NH3 at room temperature was 15.1%, approximately three times that of pure MXene, with response and recovery times of 118 s and 219 s, respectively. Moreover, the composite sensor exhibited a low detection limit, demonstrating a response of 3.496% to 5 ppm NH3 at room temperature. Additionally, the Au@MXene-20 sensor possessed good repeatability, long-term stability, and moisture resistance. Therefore, the Au@MXene-20 sensor studied and prepared in this paper has been proven to be well-suited for NH3 detection in harsh environments.
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iScience
·
2024
·
IF 4.6
Mengxi Gu,Xuan Zhou,Jienan Shen,Ruibin Xie,Yuhan Su,Junxue Gao,Binzhe Zhao,Jie Li,Yingjie Duan,Zhixun Wang,Yougen Hu,Guoqiang Gu,Lei Wang,Lei Wei,Chunlei Yang,Ming Chen
It is still a great challenge for the flexible piezoresistive pressure sensors to simultaneously achieve wide linearity and high sensitivity. Herein, we propose a high-performance textile pressure sensor based on chitosan (CTS)/MXene fiber. The hierarchical “point to line” architecture enables the pressure sensor with high sensitivity of 1.16 kPa −1 over an ultrawide linear range of 1.5 MPa. Furthermore, the CTS/MXene pressure sensor possesses a low fatigue over 1000 loading/unloading cycles under 1.5 MPa pressure load, attributed to the strong chemical bonding between CTS fiber and MXene and excellent mechanical stability. Besides, the proposed sensor shows good antibacterial effect benefiting from the strong interaction between polycationic structure of CTS/MXene and the predominantly anionic components of bacteria surface. The sensor is also applied to detect real-time human action, an overall classification accuracy of 98.61% based on deep neural network-convolutional neural network (CNN) for six human actions is realized.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Zhengguo Wu,Shanshan Li,Xiaoqian Qin,Lu Zheng,Jiawei Fang,Lansheng Wei,Changliang Xu,Zhong Alan Li,Xiaoying Wang
The development of highly effective chitosan-based hemostatic materials that can be utilized for deep wound hemostasis remains a considerable challenge. In this study, a hemostatic antibacterial chitosan/N-hydroxyethyl acrylamide (NHEMAA)/Ti 3 C 2 T x (CSNT) composite cryogel was facilely prepared through the physical interactions between the three components and the spontaneous condensation of NHEMAA. Because of the formation of strong crosslinked network, the CSNT cryogel showed a developed pore structure (~ 99.07 %) and superfast water/blood-triggered shape recovery, enabling it to fill the wound after contacting the blood. Its capillary effect, amino groups, negative charges, and affinity with lipid collectively induced rapid hemostasis, which was confirmed by in vitro and in vivo analysis. In addition, CSNT cryogel showed excellent photothermal antibacterial activities, high biosafety, and in vivo wound healing ability. Furthermore, the presence of chitosan effectively prevented the oxidation of MXene, thus enabling the long-term storage of the MXene-reinforced cryogel. Thus, our hemostatic cryogel demonstrates promising potential for clinical application and commercialization, as it combines high resilience, rapid hemostasis, efficient sterilization, long-term storage, and easy mass production.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xuan Ding,Tingxi Li
Because of electromagnetic wave pollution, there is a growing need for electromagnetic wave absorption materials. An effective strategy is to optimize their microstructure and composition. In this study, hollow polypyrrole (PPy) nanocubes (HP) are synthesized using zeolitic imidazolate frameworks (ZIFs) as sacrificial templates. Subsequently, HP/Ti 3 C 2 T x MXene (HPM) composites are fabricated through electrostatic self-assembly and freeze-drying methods. The resulting 3D conductive network and numerous heterogeneous interfaces enhance interfacial polarization, and the hollow morphology facilitates electromagnetic wave multiple reflections, thereby significantly improving electromagnetic wave absorption performance. HPM-2 realizes a minimum reflection loss (RL min ) of −53.45 dB and an effective absorption bandwidth (EAB) of 6.52 GHz at 1.84 mm. HPM-3 achieves a RL min of −72.28 dB at 2.75 nm and an EAB of 4.7 GHz at 1.61 mm. Moreover, the simulation procedures are applied to investigate the radar cross-section (RCS) attenuation. It is worth noting that with a detection angle (θ) of 0°, HPM-3 possesses a maximum RCS reduction of 35.19 dB m². This work presents a straightforward method for preparing HPM composites and lays the foundation for exploring the efficient electromagnetic wave absorption properties of conducting polymer and MXene-based composites and their derivatives.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Qi Zeng,Chenyang Xing,Zhen Xu,Qing Liu,Liangtao Yang,Hui Yang,Yi Zhang,Zhengchun Peng
Bioelectrode is critical to many biomedical researches. However, traditional materials (typically noble metals) and manufacturing techniques limit the large-scale production of bioelectrodes. Herein, a fast electrochemical approach is proposed to deposit versatile MXene/polydopamine (PDA) composites on a metalized substrate. PDA coating can improve the adhesion between MXene and the substrate, while MXene provides rough surfaces with unique micro/nanostructure and outstanding electrical/optical/thermal performance. The impedance of the as-prepared bioelectrode at 1 kHz is down to 8.48 Ω cm 2 . The corresponding cathodic charge storage capacity (CSC c ) and charge injection capacity (CIC) are up to ≈250 and 6.59 mC cm −2 respectively, much superior to that of bare Pt and other conventional material-based electrodes. The MXene/PDA composites also demonstrate robust stability under continuous electrostimulation for 1 × 10 8 pulse cycles and 1000 CV cycles. Moreover, MXene/PDA composites show a high and rapid photothermal response. Photoelectrochemical activity is also observed with high photocurrent, ≈40 folds larger than that of bare Pt. The utility of this new electrode in ascorbic acid sensing is demonstrated. Excellent biocompatibility is verified via neuron adhesion test and viability assay.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Meihong Fan,Lijia Liu,Yue Li,Fengyun Gu,Xingquan He,Hui Chen
The industrialization of hydrogen production technology through polymer electrolyte membrane water splitting faces challenges due to high iridium (Ir) loading on the anode catalyst layer. While rational design of oxygen evolution reaction (OER) electrocatalysts aimed at effective iridium utilization is promising, it remains a challenging task. Herein, we present exfoliated Ti 3 C 2 T x MXene as a highly conductive and corrosion-resistant support for acidic OER. We develop an alcohol reduction method to achieve uniform and dense loading of ultrafine Ir nanoparticles on the MXene surface. The IrO 2 /TiO x heterointerface is formed in situ on the Ir@Ti 3 C 2 T x MXene surface, acting as a catalytically active phase for OER during electrocatalysis. The electron interactions at the IrO 2 /TiO x heterointerface create electron-rich Ir sites, which reduce the adsorption properties of oxygen intermediates and enhance intrinsic OER activity. Consequently, the prepared Ir@Ti 3 C 2 T x exhibits a mass activity that is 7 times greater than that of the benchmark IrO 2 catalyst for OER in acidic media. In addition, the /Ti 3 C 2 T x MXene support can stabilize the Ir nanoparticles, so that the stability number of Ir@Ti 3 C 2 T x MXene is about 2.4 times higher than that of the IrO 2 catalyst.
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高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yanzhi Cai,Zixuan Yu,Laifei Cheng,Yibing Yuan,Shaoxiong Ren,Yalong Chai,Mingxing Chen,Xue Huang,Yanjun Li
Developing pressure sensors that combine high sensitivity, a wide response range, and a stable signal output is a great challenge. Due to the insufficiently robust structure of the sensor's skeleton, the sensor's skeleton will not only cause irreversible damage under repetitive pressure but will also produce uncontrollable deformation in the contact area between the skeletons, thus affecting the sensor's detection range, sensitivity, and the stability of the signal output. In this study, carboxymethyl cellulose/sodium alginate/MXene/carbon nanotube (CMC/SA/MXene/CNT) aerogels are prepared by directional freezing–freeze drying. The aerogel has a three-dimensional isotropic porous structure with two-dimensional faces as the supporting skeleton in the X, Y, and Z dimensions. Moreover, conductive CNTs and MXene are embedded in the skeleton to form a leaf-vein structure, which enhances the strength and toughness of the skeleton. The aerogel has a light weight, high conductivity, excellent mechanical properties (compressive strength of up to 148.78 kPa at 80% strain), and exceptional compression resilience. Assembling it into a piezoresistive sensor, it is characterized by its high sensitivity (GF = 7.6, S = 894.8 kPa−1), excellent fatigue resistance (retaining stability after at least 10 000 uninterrupted cycles), and rapid response time (0.16 s). The sensor is used for real-time monitoring of human movement and physiological activities and as a signal transmission device, indicating its broad application prospects in the field of flexible smart wearables and signal transmission devices.
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ACS Nano
·
2025
·
IF 16
Ruosong Li,Youpeng Huangfu,Lulu Liu,Jiashun Hu,Dan Zeng,Yichen Wang,Daidi Fan,Rui Zhang,Biao Zhao
Interlayer and defect engineering significantly affects the electrical conductivity and electromagnetic interference (EMI) shielding of Ti3C2Tx MXene. Previous studies have prioritized the size of the intercalant over its synergy with chemical affinity, limiting the elucidation of the intercalation mechanism and the precise control of the interlayer spacing (d-spacing). Herein, we synthesize MXene aerogels with a tunable d-spacing and defect density using a series of amine molecules of different sizes and chemical affinities as intercalants and cross-linkers. Particularly, the intercalation of p-phenylenediamine (PPD) increases the d-spacing of MXene from 0.960 to 1.642 nm. Simultaneously, the increased d-spacing contributes to an increased defect density within the Ti–Ti layer. Hence, the PPD@MXene aerogel exhibits reduced surface electric field intensity and increased internal polarization loss, resulting in absorption-dominated EMI shielding. The absorptivity reaches 0.92, far exceeding the reported shielding materials, with a shielding effectiveness of 50.4 dB. This study provides a theoretical foundation and preliminary guidance for the development of interlayer-engineered MXene shielding materials.
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COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yixiang Chen,Tongcheng Zuo,Yu Jiang,Jiajia Gui,Wanqi Feng,Dan Yu,Wei Wang
Flexible pressure sensors embody outstanding mechanical and sensing performance, particularly in the fields of personal health monitoring and artificial intelligence, while catering to multifunctional applications resilient against harsh weather conditions. Among these, Ti 3 C 2 T x MXene-based aerogel materials with high surface area and excellent conductivity have attracted a lot of attention. However, there are big challenges in improving the mechanical properties at low densities and designing multi-level pore structures . Herein, the prepared silane monomers (MP) are firstly synthesized by 3-(Trimethoxysilyl) propyl methacrylate (MPTES) and polyethylene glycol diacrylate (PEGDA), then polydopamine-modified silicon dioxide (PDA-SiO 2 ) nanofibers employed with MXene nanosheets form covalent cross-linking nanofiber aerogels. The multi-level stable structure improves both mechanical strength and elasticity. The assembled MXene/MP/PDA-SiO 2 pressure sensors exhibit a high sensitivity of −0.83 kPa −1 , a rapid response time of 48 ms, a minimum 1 % strain detection limit, and reliable stability over 10,000 cycles. Furthermore, these sensors can be used for human motion detection and health diagnostics, and show good personal thermal management performance. This work holds a promising candidate for the next generation of multifunctional flexible electronic devices.
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