INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Weixin Wu,Wenyao Feng,Yuanyua Yu,Lu Li,Minsheng Lu,Guangfu Qian,Changzhou Chen,Douyong Min
Flexible sensors based on double-network (DN) hydrogels have become a research hotspot for wearable sensors. However, developing hydrogel-based strain sensors with high tensile properties, sensitivity, and wide detection range remains a great challenge. Herein, a novel highly stretchable, sensitive, and durable strain sensor based on MXene-enhanced polyacrylamide/carboxymethyl cellulose double-network hydrogel (PCM) was prepared, where PAM served as the rigid backbone, while CMC mainly acted as a flexible sub-network structure. MXene was utilized to enhance the mechanical properties of the hydrogel via tight hydrogen bonds between its surface functional groups and the chains of PAM and CMC, while also being applied to build a conductive path in the system. As a result, the prepared hydrogel-based strain sensor featured a wide detection range (0–500%), quick response time (120 ms for loading time and 190 ms for unloading time), high sensitivity (a gauge factor of 16.33), great toughness, and excellent stability. These advantages enable the prepared sensor to be used in dynamically monitoring human movements, such as joint bending, and performing handwriting recognition. This work provides potential development, research and application of double-network flexible hydrogel in wearable materials.
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Advanced Science
·
2024
·Vol. 11
·期 36
·2404889
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IF 14.3
Ruige Su,Misheng Liang,Yongjiu Yuan,Chaojun Huang,Wenqiang Xing,Xiaomeng Bian,Yiling Lian,Bo Wang,Zheng You,Rui You
Flexible sensors based on laser-induced graphene (LIG) are widely used in wearable personal devices, with the morphology and lattice arrangement of LIG the key factors affecting their performance in various applications. In this study, femtosecond-laser-induced MXene-composited graphene ( LIMG ) is used to improve the electrical conductivity of graphene by incorporating MXene, a 2D material with a high concentration of free electrons, into the LIG structure. By combining pump-probe detection, laser-induced breakdown spectroscopy (LIBS), and density functional theory (DFT) calculations, the morphogenesis and lattice structuring principles of LIMG is explored, with the results indicating that MXene materials are successfully embedded in the graphene lattice, altering both their morphology and electrical properties. The structural sparsity and electrical conductivity of LIMG composites (up to 3187 S m −1 ) are significantly enhanced compared to those of LIG. Based on these findings, LIMG has been used in wearable electronics. LIMG electrodes are used to detect uric acid, with a minimum detection limit of 2.48 µM. Additionally, LIMG -based pressure and bending sensors have been successfully used to monitor human limb movement and pulse. The direct in situ femtosecond laser patterning synthesis of LIMG has significant implications for developing flexible wearable electronic sensors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yuxin Shi,Libo Tong,Jinghui Chu,Xiangjun Li,Bing Zhang,Kuaishe Wang
The existence of intrinsic defects in organic coating easily causes the degradation of protective ability during long-term corrosion process. A novel two-dimensional MXene (Ti 3 C 2 ) nanofiller can effectively reduce the defect density and contribute to the enhancement of anticorrosion performance, while its high conductivity may accelerate the galvanic corrosion between the organic coating and underlying substrate. In this work, a kind of three-dimensional (3D) Ti 3 C 2 MXene/polypyrrole composites (TPC) hybrid epoxy (EP) coating has been successfully fabricated on Mg alloy , which exhibits the excellent corrosion resistance and antistatic performance. The enhanced conductivity and synergistic barrier/passivation effect enable the Ti 3 C 2 MXene/polypyrrole composites with low surface resistance and excellent anticorrosion ability. Based on the electrochemical tests, the TPC/EP coating possesses remarkable impedance value with 7.73 × 10 10 Ω cm 2 after immersion for 14 days, representing the ability to extend service life due to the excellent physical barrier of Ti 3 C 2 nanosheets and the migration of electrochemical interface related to electronic transmission derived from polypyrrole (PPy) nano-particles. Moreover, the surface resistivity of the obtained coating is reduced to 2.76 × 10 8 Ω, which can be ascribed to the transmission effect of electrolyte ions through interlayer of Ti 3 C 2 /PPy network structure, and thus improving its antistatic performance. This work not only highlights the application of 2D MXene material as effective anticorrosion filler, but pave a new avenue for the development of organic/inorganic hybrid coating of Mg alloy or other metallic materials.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Xiaoxuan Tan,Yang He,Chunhong Wang,Yu Zhang,Wenshu Wang,Hanyu Li,Rongrong Yu
The proliferation of electronic devices has made electromagnetic interference (EMI) shielding increasingly critical for both device performance and human health protection. Here, we demonstrate a hierarchical composite film that achieves exceptional EMI shielding through the synergistic integration of magnetic nanofibers and MXene nanosheets. By combining electrospinning and layer-by-layer assembly, we fabricate a composite structure where Fe 3 O 4 -loaded cellulose/PAN nanofibers alternate with Ti 3 C 2 T x MXene layers, creating multiple heterogeneous interfaces for enhanced electromagnetic wave attenuation. The engineered architecture promotes multiple electromagnetic loss mechanisms through interface polarization, magnetic losses, and multiple internal reflections. The optimized composite exhibits remarkable performance metrics: achieving a thickness-specific shielding efficiency of 118 dB/mm at just 0.18 mm thickness, significantly surpassing current commercial standards. At 0.64 mm thickness, the electromagnetic shielding effectiveness reaches 33.2 dB, effectively blocking over 99.9 % of electromagnetic radiation. Notably, the composite demonstrates exceptional mechanical durability, retaining 96.8 % of its shielding effectiveness after 300 bending cycles. The integration of renewable cellulose and magnetic components with highly conductive MXene not only enhances electromagnetic wave attenuation but also promotes environmental sustainability. This combination of ultra-thin profile, superior shielding performance, and mechanical flexibility, coupled with eco-friendly material selection, provides a promising pathway for EMI protection.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Quanpei Xie,Shengwu Deng,Yong Wen,Yang Yang,Wenjie Fu,Jinxin Liu,Si Cheng
2D transition metal carbides/nitrides/carbonitrides (MXenes) have received extensive attention in solar seawater desalination due to their hydrophilicity, 100 % photothermal conversion efficiency, and efficient light-trapping by enhancing localized surface plasmon resonance (LSPR). Nevertheless, the easily oxidizable characteristics of MXenes, along with salt accumulation and structural weakness impede their practical application in solar-driven interfacial evaporators. Herein, a hydrophobic MXene@oleylamine/polyethylene terephthalate (MXene@OAm/PET) nonwoven with long-term operational stability is fabricated via firmly chemical cross-linking between oleylamine (OAm) modified MXene (MXene@OAm) and NH 2 -PEG-COOH treated PET nonwoven (PEG-PET). The MXene@OAm endows excellent oxidation resistance and hydrophobicity. The prepared MXene@OAm/PET nonwoven which exhibits broad-spectrum solar absorption and high efficiency, can achieve an average evaporation rate in 3.5 wt% NaCl solution at 1.26 kg·m −2 ·h −1 and no seeable salt deposition during 15 irradiation cycles for 8 h a day indicates its superior salt resistance and long-term stability. Most importantly, after being soaked in 3.5 wt% NaCl solution for 40 days, the evaporation rate of MXene@OAm/PET nonwoven still remains stable at around 1.22 kg·m −2 ·h −1 , indicating the significant potential of this prepared nonwoven for long-term seawater desalination and its suitability for industrial applications. Even in industrial wastewater, the evaporation rate can reach 1.27 kg·m −2 ·h −1 . This work demonstrates a successful strategy for achieving high efficiency, stability, and superior salt resistance, which can be potentially utilized in seawater desalination and wastewater treatment.
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Dong Chaoyang
To improve anti-icing traits of outdoor coatings, a synergy between photothermal and hydrophobic anti-icings was utilized to fabricate copolymer/Ti 3 C 2 T x MXene composite coatings with good transparency and adhesion. MXene contributes to photothermal trait from local surface plasmon resonance effect. Copolymer enables hydrophobicity from perfluoroalkyls-induced low surface energy and high surface roughness. An increase in MXene dose results in an increased surface roughness. With 140.0 ± 2.2° of water contact angle and 70% of light transmittance, the optimal film bears 2 wt% of MXene. High MXene dose results in large temperature-increase of film under sunlight. After 15 min of sunlight exposure, the temperature of optimal film surface in icing simulation increases from − 18 ℃ to 7.2 ℃. After 48 h of acid immersion, the temperature-increase of optimal film surface based on 300 s of sunlight irradiation reaches 28.7 ± 1.2 ℃. After 48 h of ultraviolet irradiation, the temperature-increase of optimal film surface is 30.7 ± 0.8 ℃. This surface has a water contact angle of 132.7 ± 1.1° after 48 h of acid immersion. This study gives impetus to a preparation of various composite coatings for outdoor anti-icing/deicing.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shaokai Hu,Ping Han,Chao Meng,Ying Yu,Shaolong Han,Haoyu Wang,Gang Wei,Zheng Gu
With the huge demand and rapid development of portable, intelligent, and microscale equipment, more stringent requirements are put forward for the thickness, performance, and cost of the electromagnetic interference (EMI) shielding materials. In this work, flexible and ultrathin MXene/nanofiber (MX/NF) composite films with excellent EMI shielding performance are designed and fabricated by self-stacked assembly through vacuum-assisted filtration. 2D MXene nanosheets are utilized as conductive materials to construct a conductive path, and cellulose nanofibers (CENF) and carbon nanofibers (CANF) are applied to improve the flexibility and supportability of the designed composite films. When the mass ratio of MXene to CANF-CENF is 4:1 and the thickness of the composite film is 11 μm, the shielding effectiveness (SE) of the EMI film reaches 43.1 dB. In addition, the ranking efficiency product (REP) sustainability analysis is performed for the MX/NF-0.8 and three other EMI films, and it is found that the MX/NF-0.8 composite film possesses the largest REP value of 0.787. Besides, it exhibits the advantages in terms of degradability and shielding performance. The presented flexible, ultrathin EMI shielding films with layer-stacked structure reveal great application potential in the field of EMI shielding and could be appliable for wearable intelligent devices.
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Materials Today Sustainability
·
2024
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IF 7.1
Wentao Huang,Jie Xia,Zhigang Li,Xiaoshuan Zhang
The pursuit of simple, cost-effective, and efficient flexible ammonia sensors is an area of keen interest. This study aimed to create a highly sensitive, affordable flexible sensing patch (FDP) for immediate ammonia and impedance monitoring. Using a laser direct writing technique, symmetrical graphene patterns were crafted onto commercial kapton tape. These patterns were folded in half, allowing the lower layer to serve as an impedance sensor and the upper layer as an electrode for ammonia detection. The modified Ti 3 C 2 T x MXene solution was introduced as the sensitive layer in response to ammonia gas, and we also explored how varying thicknesses of this sensitive layer affected the response results. Notably, the results highlighted that FDPs with two thicknesses (50 μL solution) offered optimal ammonia detection. With a detection limit of 150 ppb, impressive sensitivity (18.08%/ppm), exceptional linearity (0.996), and stability within the 0.5 ppm–20 ppm range, the overall performance of the FDP surpassed that of most reported ammonia sensor devices based on graphene materials. FDP was able to better characterize the shelf life of lamb at a cost of no more than $1.5. This study provides solutions for rapid ammonia detection and food quality assessment .
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hai Jiang,Jiabo Zhang,Zhiwei Weng,Longyan Chen,Yichuan Wu,Xuan Weng
Flexible strain sensors have been widely used in wearable electronics. However, the fabrication of flexible strain sensors with a large strain detection range, high sensitivity, and negligible hysteresis remains a formidable challenge, even after enormous advancements in the field. Herein, a flexible microfluidic strain sensor was fabricated by filling poly(3,4-ethylenedioxythiophene):polystyrenesulfonate–MXene–gold (PEDOT:PSS–MXene–Au) nanocomposites into microchannels in an elastic matrix. Owing to the unique properties of the nanofiller and Ecoflex elastomer microchannel, the microfluidic strain sensor detected a strain of 0%–500% with low hysteresis (2.4%), high sensitivity (guage factor = 25.4), short response times (∼86 ms), and good durability. Moreover, the flexible microfluidic sensor was used to detect various physiological signals and human activities, control a mechanical hand, and capture hand motions in real time. As demonstrated by its good performance, the proposed flexible microfluidic sensor holds great potential in applications such as wearable electronics, physiological signal monitoring and human–machine interactions.
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Small
·
2025
·
IF 12.1
Ruixue Li,Peng Song,Zhenyuan Ji,Hu Zhou,Xiaoping Shen,Lirong Kong,Aihua Yuan
MXene film-derived flexible supercapacitors have shown great application foreground for wearable electronics, but the capacitive characteristics, especially when faced with mechanical deformations, are not satisfactory. Herein, a new kind of flexible electrode, MX/D-MoO 3 , is developed by using Ti 3 C 2 T x MXene film (MX) and defect-rich MoO 3 (D-MoO 3 ) as the “main body” and “spacer-contributor”, respectively. Results indicate that, with D-MoO 3 intercalation, notably enlarged layer spacing of Ti 3 C 2 T x nanosheets and boosted electrochemical active sites are fulfilled, which have facilitated wondrous property increases of 342% and 239% when compared to raw MX and MX/MoO 3 , respectively. Particularly, MX/D-MoO 3 -60 has a high specific capacitance of 2734.3 mF cm −2 at 1 mA cm −2 , which surpasses most of the counterparts reported thus far. The MX/D-MoO 3 -60-based all-solid-state supercapacitor presents the largest energy density of 96.3 µWh cm −2 at 205.9 µW cm −2 and an outstanding power density of 1871.4 µW cm −2 at 18.6 µWh cm −2 . Meanwhile, impressive stability with capacitance retention of 91.8% after 5 000 cycles and great mechanical flexibility with capacitance retention of 90.3% under bending angles from 0 to 180° are also exhibited. The superior properties and facile preparation endow MX/D-MoO 3 -60 with promising applications in wearable energy storage.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Yezhou Ni,Jingyu Chen,Kunlin Chen
Manufacturing flexible sensors with prominent mechanical properties, multifunctional sensing abilities, and remarkable self-healing capabilities remains a difficult task. In this study, a novel vanillin-modified polyacrylate (VPA), which is capable of forming green dynamic covalent crosslinking with chitosan (CS), was synthesized. The synthesized VPA was combined with mesoporous silica-modified MXene (AMS-MXene) and covalently cross-linked simultaneously with CS, resulting in the formation of a flexible composite conductive film designed for dual-mode sensors. Due to the multidimensional structure formed by the mesoporous silica and MXene layers, the resulting composite film is not only suitable for strain sensing but also excels in gas response sensing. Most importantly, the composite films demonstrate a remarkable self-healing capability through reversible dynamic covalent bonds, specifically Schiff base bonds, coupled with multiple hydrogen bonding interactions with AMS-MXene. This robust self-repair functionality remains effective even at a low temperature of 30 °C. Additionally, the synergistic antibacterial effect exerted by vanillin and CS in the film can endow the composite sensor with excellent antimicrobial properties. This multifunctional composite film holds tremendous potential for applications in green flexible wearable sensors. Furthermore, it can show diverse applications in a wide variety of fields, driving advances in wearable technology and human health monitoring.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huiming Shi,Quanquan Shi,Xinrui Gu,Binli Wang,Brock Lumbers,Gao Li
The highly efficient photo-oxidation of alcohols has sparked significant potential to cope with environmental pollution and the ever-increasing energy crisis. This study reports a unique Ti 3 C 2 /BiOBr (TB) heterojunction with a rich inter-face based on in situ exfoliation of MXene and subsequently anchored onto BiOBr sheets. The TB nano-composites exhibited substantially improved photo-catalytic activity towards the photo-oxidation of benzyl alcohol (BA) to benzaldehyde and achieved a formation rate of 1.73 mmol g −1 h −1 , greater than pristine BiOBr. The ultra-thin inter-facial contact boosted the oxygen vacancies (O v ) and Ti 3+ and possessed the most negative adsorption energy, which boosted the transfer and separation of inter-facial charge carriers and the adsorption and dissociation of BA. Overall, the successful synthesis of TB composite, along with its exceptional photo-catalytic performance, offers valuable insights for applications in green chemistry and environmental remediation.
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