ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuxian Sun,Ruoxin Yuan,Shangwen Ling,Tiantian Zhou,Ziqin Wu,Mengyuan Fu,Hanna He,Xiaolong Li,Chuhong Zhang
Conductive hydrogels have garnered significant interest in the realm of wearable flexible sensors due to their close resemblance to human tissue, wearability, and precise signal acquisition capabilities. However, the concurrent attainment of an epidermal hydrogel sensor incorporating reliable self-healing capabilities, biodegradability, robust adhesiveness, and the ability to precisely capture subtle electrophysiological signals poses a daunting and intricate challenge. Herein, an innovative MXene-based composite hydrogel (PBM hydrogel) with exceptional self-healing, self-adhesive, and versatile functionality is engineered through the integration of conductive MXene nanosheets into a well-structured poly(vinyl alcohol) (PVA) and bacterial cellulose (BC) hydrogel three-dimensional (3D) network, utilizing multiple dynamic cross-linking synergistic repeated freeze–thaw strategy. The hydrogel harnesses the presence of dynamically reversible borax ester bonds and multiple hydrogen bonds between its constituents, endowing it with rapid self-healing efficiency (97.8%) and formidable self-adhesive capability. The assembled PBM hydrogel epidermal sensor possesses a rapid response time (10 ms) and exhibits versatility in detecting diverse external stimuli and human movements such as vocalization, handwriting, joint motion, Morse code signals, and even monitoring infusion status. Additionally, the PBM hydrogel sensor offers the added advantage of swift degradation in phosphate-buffered saline solution (within a span of 56 days) and H2O2 solution (in just 53 min), maintaining an eco-friendly profile devoid of any environmental pollution. This work lays the groundwork for possible uses in electronic skins, interactions between humans and machines, and the monitoring of individualized healthcare.
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COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yaoxun Zhang,Jian Zou,Shengji Wang,Xiangshu Hu,Zihao Liu,Peiyong Feng,Xin Jing,Yuejun Liu
MXenes are ideal conductive fillers to construct conductive routes for hydrogel-based flexible sensors owing to their great metallic conductivity, hydrophilicity , and high specific surface area. However, their high tendency to aggregate in sol solution severely limited the performance of the resultant hydrogels. Therefore, to enhance the performance of MXene-filled composite hydrogels , we proposed an oxidization method to tailor the nanostructure of MXene to improve the conductivity, transparency, mechanical properties, and sensitivity of the composite hydrogels. Meanwhile, it is noted that the conductivity of the hydrogel significantly affected the output performance of hydrogel-based triboelectric nanogenerator (H-TENG). The polyacrylamide/oxidized MXene (POM) hydrogel-based TENG with the highest output performance was assembled for self-powered sensing and energy harvesting , which demonstrated great reliability and durability with a maximum open circuit voltage of 243 V and a peak power density of 2.38 W/m 2 . Moreover, the relationship model between the conductivity of the hydrogel and the output performance of the H-TENG was successfully proposed based on the performance of the developed H-TENGs. Therefore, this work shed lights for reasonable design of H-TENGs with high output performance.
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ACS Sensors
·
2024
·
IF 8.2
Xiao-Xue Wang,Chen-Yu Wang,Meng Yin,Ke-Zheng Chen,Sheng-Lin Qiao
MXene-based conductive hydrogels hold significant promise as epidermal sensors, yet their susceptibility to oxidation represents a formidable limitation. This study addresses this challenge by incorporating MXene into a tannic acid (TA) cross-linked silk fibroin matrix. The resulting conductive hydrogel (denoted as e-dive) exhibits favorable characteristics such as adjustable mechanical properties, self-healing capabilities (both mechanically and electrically), and strong underwater adhesion. The existence of a percolation network of MXene within the nanocomposites guarantees good electrical conductivity. Importantly, the surface interaction of MXene nanosheets with the hydrophobic moiety from TA substantially reduced moisture and oxygen interactions with MXene, thereby effectively mitigating MXene oxidation within hydrogel matrices. This preservation of the electrical characteristics ensures prolonged functional stability. Furthermore, the e-dive demonstrates inherent antibacterial properties, making it suitable for use in underwater environments where bacterial contamination is a concern. The utilization of this advanced e-dive system extends to the correction of diving postures and the facilitation of underwater healthcare and security alerts. Our study presents a robust methodology for enhancing the stability of MXene-based conductive hydrogel electronics, thereby expanding their scope of potential applications.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhen Wan,Cheng Li,Ronghui Liu,Wei Zhou,Wenjing Fan,Chuanxue Huang,Yang Liu
Two-dimensional (2D) Ti3C2Tx MXene materials show great potential in electrochemical and flexible sensors due to their high electrical conductivity, good chemical stability, and special delaminated structure. However, their thermal properties were rarely studied, which remarkably affect the stability and safety of various devices. Here, we fabricated a suspended MXene drum resonator photothermally driven by a sinusoidally modulated laser, measured the thermal time constant by demodulating the thermomechanical motion, and then calculated the thermal conductivity and thermal diffusivity of the MXene film. Experiments show the thermal conductivity of the film increases from 3.10 to 3.58 W/m·K while the thermal diffusivity from 1.06 × 10–6 to 1.22 × 10–6 m2/s when temperature increases from 300 to 360 K. We also confirm the film thermal conductivity is mainly contributed by phonon transport rather than electron transport. Furthermore, the relationship between the mechanical and thermal properties of the MXene films was disclosed. The thermal conductivity decreases when film strain increases, caused by enhanced phonon scattering and softening of high-frequency phonons. The measurements provide a noninvasive method to analyze the thermal characteristics of suspended MXene films, which can be further extended to the thermal properties of other 2D materials.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Guangpeng Ma,Wenyu Bai,Xinpu Zhou,Xianfeng Guan,Shuyu Zhang,Wanzhen Wu,Cuicui Li,Shuang Wang
Polyaniline (PANi) is widely used in supercapacitors owing to its unique structural flexibility and redox behavior. However, due to the limitations of the inherent molecular structure, the expansion and contraction of the PANi skeleton will be triggered during the charging and discharging process, leading to decreased stability and rapid degradation. For this reason, we design a novel sulfonated polyaniline structure of aniline copolymerized with 2-aminobenzenesulfonic acid, thus immobilizing the sulfonic acid group (−SO 3 H) side chain onto the PANi main chain. The −SO 3 H acts as a proton reservoir to provide protons for PANi, accelerating the occurrence of redox reactions and providing pseudocapacitance, effectively suppressing the deprotonation phenomenon. Then SPANi is grown in-situ on the interlayers of MXene, which induces the disordered polymer to be ordered on the MXene substrate, forming a 3D interconnected network composite with both high specific capacitance and excellent stability. SPANi/MXene composite has an outstanding specific capacitance of 512.45 F g −1 at 1 A/g and retains up to 92.16 % of the initial capacitance after 10,000 cycles. Assembled with PHEAA-PAA-MXene double-crosslinked organogel electrolyte to form an anti-freezing device with a specific capacitance of 158.63 F g −1 , it retains a high specific capacitance of 118.26 F g −1 even under the extreme conditions of −40 °C. The capacitance retention after 10,000 cycles is 95.2 % (20 °C) and 81.82 % (−40 °C), respectively. This work provides simple and effective methods to fabricate high-performance PANi-based electrodes and anti-freezing supercapacitors.
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NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 7
·2889-2897
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IF 2.5
Yanan Zhu,Yongchang Yang,Shiqiang Li,Chang Zhu,Zegang Qiu,Qianqian Zhu
The development of efficient materials for adsorption desulfurization has attracted much attention for the safety of humans and the ecosystem. Metal–organic frameworks have shown promise in removing organic sulfur compounds in liquid fuels, while another star material – MXene has rarely been applied in this field. In this study, Ti3C2Tx MXene/Cu-MOF composites with different MXene contents (3.3%, 6.7%, and 13.3%) were synthesized via an in situ precipitation method. Characterization showed that the Cu-MOF was successfully coated on the surface of Ti3C2Tx MXene and partially embedded between the MXene nanosheets, restraining the agglomeration of both MXene and the Cu-MOF. The optimal composite-3.3%MXene/Cu-MOF presented the largest surface area of 166.6 m2 g−1. Compared to MXene and Cu-MOF, 3.3%MXene/Cu-MOF exhibited an enhanced adsorption performance for methyl phenyl sulfide in the model fuel with an equilibrium adsorption capacity of 87.4 mg g−1. Furthermore, the effects of adsorption parameters, adsorption kinetics, adsorption isotherms, and the adsorption mechanism, and regenerative performance of 3.3%MXene/Cu-MOF were comprehensively discussed. A pseudo-second order kinetic model and the Langmuir adsorption isotherm were found to better explicate the adsorption behavior on 3.3%MXene/Cu-MOF, which exhibited a theoretical maximum adsorption capacity of 183.9 mg g−1. This work hopes to shed light on the material design for adsorption desulfurization.
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JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Xiao Duan,Fusen Lv,Jiaqi Liu,Tie Liu,Shuang Yuan
MXenes exhibit a distinctive two-dimensional (2D) open-layered architecture, characterized by an extensive specific surface area, abundant surface functional groups, and excellent electrical conductivity, rendering them a promising candidate for the anode material in lithium-ion capacitors (LICs). However, the inherent tendency of MXenes towards interlayer restacking and structural degradation severely impedes ion transport kinetics, leading to compromised electrochemical performance. To address this issue, a straightforward hydrothermal synthesis strategy was proposed for fabricating porous Co 3 O 4 nanoneedle/MXene composites via in-situ grown self-assembly. The two-dimensional layered structure, high electrical conductivity, and abundant surface functional groups of MXene enable efficient ion intercalation, while Co 3 O 4 contributes enhanced theoretical capacity and rich oxidation states. These two components form a mutually supportive synergistic effect. This synergy not only shortens the ion/electron transport pathways within the MXene matrix but also mitigates the agglomeration and volume expansion phenomena associated with the Co 3 O 4 nanoneedles. Therefore, the obtained Co 3 O 4 MXene electrode maintained a specific capacity of 632 mA h g −1 after 1000 cycles at a high current density of 1 A g −1 , far exceeding the original MXene electrode. Assembled with activated carbon to form Co 3 O 4 nanoneedles/MXene//AC lithium-ion capacitors (LIC), achieving a high energy density of 254 Wh k g −1 and a maximum power density of 4000 W kg −1 . The excellent performance of the porous and porous Co 3 O 4 nanoneedle/MXene composite reflects its potential as a high-performance anode material for LIC.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Huanhuan Dong,Xiaoyu Ji,Zhao Li,Junxiang Guo,Shan Peng
Viscous oil spills (e.g., petroleum and diesel) in marine environments and domestic oily wastewater pose seriously ecological and public health risks owing to their high viscosity and poor fluidity, making the remediation a very urgent challenge. To address these issues, we designed an inherently hydrophobic MXene/hollow CuCo-MOF (H-CuCo-MOF)@PDMS sponge featuring an instantly photothermal response and a multiscale wrinkled structure. The confined effects of H-CuCo-MOF and MXene synergistically generate an efficient electron transport network, where interfacial charge transfer enhances carrier lifetime, thereby prolonging photothermal conversion efficiency. In Addition, the high specific surface area of H-CuCo-MOF and the layered structure of MXene increase confined adsorption sites while preventing MOF aggregation. Stress mismatch between flexible PDMS and rigid MXene form a highly wrinkled architecture, effectively mitigating MXene stacking. Under 1-sun irradiation, the sponge’s surface temperature quickly reaches ∼80 °C within 20 s, altering surface tension and inducing the Marangoni effect to accelerate oil absorption. Moreover, taking advantages of high match between the coated sponge and the viscous oil, the separation efficiencies are exceeding 95 % for diesel oil and rapeseed oil, and 82.7 % for crude oil. The material also proves superior durability, maintaining stable hydrophobicity after 150 friction cycles, exceptional mechanical recovery (99.2 % after 10 compressions), and notable salt resistance and antibacterial properties.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Xintong Dong,Mengyuan Li,Xueyan Zhong,Mingqi Sun,Xiaoying Zhang,Ying Wang,Yao Wang,Ying Guo
Electrochemical biosensors based on nicotinamide adenine dinucleotide (NADH)-dependent dehydrogenases hold great potential in analytical applications. However, previous biosensors can lead to enzyme detachment and inactivation, thus limiting their applications. This study presents a novel sensing platform based on a three-dimensional MXene-graphene oxide sponge (3D MG). The nanoporous sponge was synthesized by polyethylene glycol (PEG) assisted cross-linking of MXene and small-sized graphene oxide (GO) nanosheets, thereby forming a high-strength porous conductive network and addressing the instability of enzyme-based biosensors. This sponge significantly enhances enzyme immobilization (reducing leaching by 62.27% compared to MXene films) and maintains enzymatic activity under extreme conditions. The 3D MG sensing platform was further fabricated into two biosensors by immobilizing NADH-dependent dehydrogenases (with glutamate dehydrogenase and formate dehydrogenase employed as model enzymes, respectively), using the (2,2′-bipyridyl) (pentamethylcyclopentadienyl)-rhodium complex ([Cp*Rh(bpy)Cl]+) as a mediator that enables the regeneration of bioactive NADH. The two biosensors exhibited low detection limits (0.332 μM for NH4+ and 0.188 mM for HCO3–), excellent reproducibility (relative standard deviation < 4%), and long-term stability (94.82% and 92.63% signal retention after 60 days). The fabrication of 3D MG with a robust nanoporous structure and an enzyme-friendly environment provides a strategy for designing long-life multifunctional enzyme-based biosensors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Mingjun Zou,Yikun Ji,Bin Liu,Shujuan Liu,Qian Ye,Feng Zhou
Hydrogels exhibit great potential in marine antifouling applications due to their ability to form a surface hydration layer that resists microbial adhesion. However, their practical application is often hindered by poor mechanical properties and limited antifouling performance. To address these challenges, nanomaterials have been employed to enhance hydrogel performance. Herein, we functionalized MXene nanosheets by grafting methacryloxyethyltrimethyl ammonium chloride (METAC) microgels, followed by electrostatic adsorption of sodium lignosulfonate (SLS), resulting in functionalized MXene nanosheets with enhanced antibacterial and antifouling properties. These nanosheets were then embedded within hydrogel matrix to form nanocomposite hydrogels. The reinforced internal crosslinking network significantly improved the mechanical performance, increasing tensile stress from 55 KPa to 167 KPa and tensile strain from 636 % to 971 %. The MXene-METAC-SLS/Gel also exhibited excellent antifouling performance, achieving antibacterial rates of 91.0 % and 93.1 % against Staphylococcus aureus and Escherichia coli , along with algal removal rates of 83.5 % and 85.1 % for Dunaliella and P orphyridium , respectively. The incorporation of functionalized nanosheets not only enhanced antimicrobial capability but also strengthened the surface hydration layer, further resisting microbial adhesion. This study expands the potential applications of nanocomposite hydrogels in marine antifouling coatings.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liang Ma,Yuxi Yang,Limin Wu,Min Chen
Nanoscale energy harvesting based on the principles of friction electricity and electrostatic induction shows great potential for low-frequency, low-density forms of energy distribution. However, selection of materials for the electrode layer is still mainly limited to metal/metal oxide, necessitating the development of electrode architectures to enable performance breakthroughs and expand application scope. Notably, multiple application scenarios such as building-integrated rainwater energy harvesting through architectural coatings require coating-enabled harvesting technologies and special material choices that directly contribute to reducing dependence on traditional fossil fuels. A flexible coated electrode featuring MXene-graphene oxide (GO) 2D nanostructured self-assembled composites with interlayer-reinforced microsphere-sheet structure has been designed, which exhibits good performance characteristics of a metal-like electrode layer. The droplet electricity generating membranes (DEGM) fabricated from dielectric material polytetrafluoroethylene (PTFE) and coated source electrode (SE) achieves a short-circuit current (I sc ) of 960 μA, a peak power density of 108 W m −2 , and an efficiency of 10.45 %. The development of coated SE provides approaches to surface-coated droplets energy harvesting for green buildings and the deployment of distributed Internet of Things (IoT) systems.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Juan Cui,Jun Li,Zhengyu Zhang,Tongtong Xu,Zegeng Chen,Zeyang Zhang,Qingxin Meng,Zhongxiang Zhou
Electromagnetic wave absorption performance is strictly dependent on attenuation and impedance matching, which are directly influenced by the ratio of MXene/MAX in the multilayer structured MXene/MAX composites. However, there is still a challenge to achieve collaborative optimization of dielectric loss and impedance matching by precisely regulating the proportional relationship of MXene/MAX. Herein, V-based MXene/MAX heterostructure composites with different V2C/V2AlC ratios were successfully synthesized by rationally controlling the temperature and time of the hydrothermal reaction. Experimental results indicated that V2C-100 °C-1 harvested the balance between reduced impedance matching and enhanced dielectric losses, which was attributed to the mildly enhanced conduction loss and polarization loss. The first principles indicated that abundant electrons migrate from the V atoms of the MXene to the C atoms of the MAX phase. The charge redistributed and accumulated at the interface, exciting the increase in the dielectric loss of V2C-100 °C-1. As a result, the V2C-100 °C-1 heterostructure composite had an excellent electromagnetic absorption effect with a minimum reflection loss of −50.06 dB and a wide effective absorption bandwidth of 4.0 GHz (12.72–16.72 GHz). This work provides a valuable experience for the development of efficient MXene-based microwave absorbing materials.
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