ADVANCED FUNCTIONAL MATERIALS
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2023
·Vol. 34
·期 11
·2311637
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IF 19
Xinyun Lin,Dekui Song,Tianci Shao,Ting Xue,Wenya Hu,Wenchao Jiang,Xiaoqin Zou,Nan Liu
For real-time care of metabolic diseases, it is highly demanded to simultaneously monitor metabolite content and diagnose muscle strength in a rapid and convenient way. However, such a biosensor with integrated functions of detecting chemical and biopotential signals at the same time has seldom been reported. In this work, a multifunctional biosensor, integrating the electrochemical detection of uric acid (UA) and glucose (Glu) in sweat, electrophysiological signal acquisition, and electrostimulation therapy, is designed. Hence, an electrophysiological MOF/MXene electrode is fabricated using highly conductive MXene and porous conductive metal–organic framework (c-MOF, Ni 3 (HITP) 2 ). Compared with commercial Ag/AgCl electrode, MOF/MXene electrode has lower electrode/skin interface impedance, higher stability and signal-to-noise (SNR). By utilizing the high charge storage capacity (CSC) of MOF/MXene electrode, it can realize muscle treatment by electrostimulation. Besides, with abundant active regions of c-MOF, the electrode exhibits excellent electrochemical performance in detecting sweat metabolites. Multimodal signals detected by such integrated biosensors are wirelessly transmitted to a mobile terminal, showing significant potential on muscle theranostics and daily non-invasive monitoring. Additionally, they offer timely nutritional guidance for individuals dealing with hyperuricemia or hyperglycemia.
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Crystals
·
2023
·Vol. 13
·期 8
·1234
·
IF 2.7
Zhiwei Liu,Zhaobo Liu,Guanlong Li,Yan Zhao,Kai Wang,Xiangbao Chen
At present, the rapid development of electronic devices such as batteries, sensors, capacitors and so on is creating a huge demand for lightweight materials with a designed structure and function. Ti3C2TxMXene, a lightweight two-dimensional (2D) nanomaterial with excellent electronic properties, has been favored in this field. In this work, Ti3C2TxMXene was annealed under an inert gas (N2, Ar and CO2) atmosphere to design the crystal structure and interface of the nanosheets, and then the modified nanosheets with specific changes in dielectric properties were obtained. Among them, the key temperature points (100 °C, 300 °C, 500 °C and 800 °C) in the thermogravimetric (TG) test under an air atmosphere were used as the annealing temperature. When annealing under an air atmosphere, with the increase in temperature, the Ti layer gradually oxidized and evaporated, and the original two-dimensional structure was partly destroyed with some of the C atoms reacting with O2to form CO2. In the inert gas atmosphere, however, the 2D structure is preserved, except that the surface end groups and layer spacing are changed. In addition, some N element doping was introduced into the nanosheets after N2atmosphere treatment, which changed the original lattice structure. After the Ar atmosphere treatment, some Ti atoms on the surface were oxidized in situ to form TiO2grains with different crystal forms, which increased the interfacial area. The C-TiO2structure of the nanosheets was more complete after treatment with the CO2atmosphere. All the nanosheets after heat treatment with an inert gas atmosphere retained the characteristic morphology of 2D materials, and different changes in the micro-structure caused changes in dielectric properties, thereby meeting the needs of 2D nanomaterials Ti3C2TxMXene in different scenarios.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Chandraleka Chinnasamy,Nagapandiselvi Perumal,Akanksha Choubey,Saravanan Rajendran
The recent expeditious industrialization and urbanization showcase the increasing need for renewable and non-renewable energy and the severe environmental crisis. In this regard, numerous 2-dimensional (2D) nanomaterials have been developed as a facile approach to meet the futuristic energy essentials and to resolve the crisis. In contrast, the newly explored 2D MXenes (transition metal carbide/nitrides/carbonitride) have been employed as an intriguing material for various environmental applications. This development is accredited to their unique properties, which include a vast surface area, strong electrical conductivity, fascinating photophysical properties, high mechanical properties, stability in an aqueous medium, high hydrophilicity, biocompatibility, ease of functionalization, and excellent thermal properties. MXenes act as a potential candidate in water desalination , energy storage devices such as electrodes of Li-ion batteries and pseudo capacitors, hydrogen production , sensors, and wastewater treatment . This review article deliberates the synthesis of MXene and nanocomposites of MXene and their photo-catalytic actions against various toxic pollutants such as organic dyes and heavy metals in wastewater. This review also precises the various preparation methods of MXene-based photocatalyst and the enhanced photocatalytic activity of MXene and MXene-based nanocomposites in wastewater treatment. Also, it details the attempts made to improve the photocatalytic activity of MXene-based nanocomposites in terms of their structural compositions. In addition, the merits and demerits of the MXene-based photocatalysts are deliberated, which may pave the way for future research in this arena.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yanan Li,Haiyu Luo,Wenlan Ji,Shuming Li,Pei Nian,Nan Xu,Nong Ye,Yibin Wei
Two-dimensional (2D) Ti 3 C 2 T x MXene nanosheets have been identified as promising for constructing ultrathin laminar nanostructures with nanoscale water transport channels for water purification. Herein, ZnO@Ti 3 C 2 T x MXene nanofiltration (NF) membranes were prepared via coupling ZnO nanoflowers to the Ti 3 C 2 T x MXene-based laminar nanostructure, which exhibited photocatalytic self-cleaning properties driven by visible light for enhanced organic dye removal. The physicochemical properties and NF performance with and without photocatalytic treatment were systematically characterized. The prepared ZnO@Ti 3 C 2 T x MXene NF membrane could reject 95.44% Congo red (CR) and demonstrated an excellent water permeability of 138.81 L·m −2 ·h −1 ·bar −1 (LMH/bar). In comparison to the Ti 3 C 2 T x MXene membrane and the same amount of ZnO powders, the ZnO@Ti 3 C 2 T x MXene membrane demonstrated higher photodegradation performance to 10 ppm MB. Impressively, the membrane showed an enhanced separation performance for 6 cycles with a RhB rejection > 88.48% and a permeability of 138.69 LMH/bar. Lastly, the synergistic photocatalytic mechanism of ZnO@Ti 3 C 2 T x MXene composite nanostructure was investigated. Such results may offer a novel insight for the fabrication of laminar structured Ti 3 C 2 T x MXene-based NF membranes with photocatalytic induced anti-fouling performance for enhanced dye water purification.
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E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Jinbo Liu,Xuewei Tang,Xiaotong Chen,Guoqing Wang
The study of repairing materials is of paramount importance, considering that damage during usage can significantly impact performance and bring inconvenience during maintenance work. One highly sought-after material is water-swellable elastomers, known for their effect in sealing and repairing damaged materials. In this study, agar/polyurethane dual-network hydrogel elastomers were prepared, which were further modified by MXene. The material exhibits a uniform and flat surface, along with a rich pore-filled internal structure. It showcases excellent thermal stability, good tensile strength retention, and a controllable low swelling rate (SR) upon water absorption. The performance of the material can be regulated by the MXene content. In addition, the “water absorption–drying–water absorption” cycle effectively controls the reduction of the SR and gradually increases the tensile strength. All samples demonstrated exceptional photothermal conversion efficiency, stability, and durability, with the maximum conversion temperature increasing with the MXene content. The scratch repair experiments demonstrated the remarkable potential of these materials for photothermal conversion-assisted repair. These materials can be adapted as auxiliary restoration materials in water bodies and various application environments, making them ideal for repair and restoration purposes.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·
IF 4.3
Chen Yi,Jiang Cailing,Huang Feixiang,Yu Zizhen,Jiang Li
Combining the unique advantages of two-dimensional transition metal carbon/nitrogen compounds (MXene) and the excellent surface-enhanced Raman scattering (SERS) performance of noble metal materials, MXene/Ag NPs films were proposed as nanocarriers for SERS-traceable drug delivery. The films were prepared by two-step self-assembly on positively charged silicon wafers using virtue of the high evaporation of ethyl acetate, the Marangoni effect, and an oil/water/oil three-phase system. With 4-mercaptobenzoic acid (4-MBA) as the probe molecule, the SERS detection limit was 10 −8 M and had shown a good linear relationship in the range of 10 −8 –10 −3 M. Simultaneously, the film had good uniformity, repeatability, and stability. When Ti 3 C 2 T x /Ag NPs films were used as nanocarriers, the anticancer drug doxorubicin (DOX) was loaded onto the surface through 4-MBA, and the tracking and monitoring were realized by SERS. The addition of glutathione (GSH) triggered the thiol exchange reaction, resulting in the shedding of 4-MBA from the surface of the film, which indirectly achieved the efficient release of DOX. Furthermore, the loading of DOX and the drug release effect triggered by GSH maintained a certain stability in serum, which provided a potential possibility for the subsequent loading and release of drugs by films with three-dimensional structures as scaffolds in biological therapy. Graphical abstract
Self-assembled MXene/Ag NPs film nanocarriers for SERS-traceable drug delivery and GSH-triggered high-efficiency drug release
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Materials Today Communications
·
2023
·
IF 3.8
Xianhong Zheng,Peng Wang,Binbin Ding,Jinhao Tang,Xinghua Hong,Zhi Liu,Wen Xia,Xiaoshuang Zhou,Zongqian Wang,Lihua Zou,Changlong Li
Stretchable electrical conductors hold great promise in the wearable electronic devices, such as flexible display and human-machine interface. Stable conductivity is vital for wearable devices to maintain their stable performance. However, the electrical resistance of most reported yarns dramatically increases when they are deformed. Herein, we propose a design for a coaxial-helix structure by wrapping the polyaniline/MXene-based elastic core-spun yarn on itself in the form of coils. The fabricated coaxial-helix structured yarns (DCSs) exhibit excellent strain-insensitive properties, including low relative resistance change (25.4%), large strain (200%) and high quality factor (17.95). Moreover, the DCSs can be used as the stretchable electrodes for the supercapacitors , and delivers a linear specific capacitance of 256.7 mF cm −1 , which is higher than most stretchable yarns. Therefore, the proposed coaxial-helix structure design creates a new approach for the strain-insensitive stretchable conductor, thereby paving the way for the development of stretchy electronics.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2022
·
IF 2.712
Lumin Li,Xiaofeng Ji,Kai Chen
The rapid development of flexible electronic technology has led to the in-depth study of flexible wearable sensors to achieve accurate sensing under different external stimuli. However, it is still a huge challenge to develop hydrogel-based wearable skin-like sensors with super ductility, high sensitivity, and self-healing properties. Herein, the Ti3C2 type of MXene was synthesized, and the Ag/MXene nanocomplexes were incorporated into polyvinyl alcohol-borax matrix to construct a novel composite hydrogel as the multifunctional nanofillers, which could bring both improved properties and novel functionalities. The Ag/MXene-Poly (vinyl alcohol) (PVA) hydrogel displayed integrated merits of highly strain sensitive (GF = 3.26), self-healing (within 10 min, 91% healing efficiency), and excellent antibacterial activity. The hydrogel could be assembled into a wearable skin-like sensor to monitor human movement, including large deformations (finger, elbow, wrist, and knee bending) and tiny deformations (mouth’s movement and throat vocalization) in real time. Therefore, this work shed a new light on the development of flexible wearable skin-like sensors for the personalized healthcare monitoring, human–machine interfaces, and artificial intelligence.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Meng Ma,Wenting Tao,Xianjun Liao,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Conductive polymer composites (CPCs) had attracted tremendous attention in the field of electromagnetic interference (EMI) shielding. However, these materials encountered an intrinsic contradiction between high EMI shielding effectiveness (EMI SE) and low electromagnetic waves reflection. Herein, an excellent EMI SE and low electromagnetic waves reflection composite film with a controllable magnetic-conductive dual gradient structure was constructed using cellulose nanofiber (CNF), MXene, and FeCo by layer-by-layer vacuum filtration method. Benefiting from the synergy of the transition layers and reflection layer with gradient structure, the composite film exhibited favorable impedance matching, abundant loss mechanism, and efficient EMI shielding ability, resulting in absorption dominated shielding characteristic. In addition, the gradient structure facilitated the “absorb-reflect-reabsorb” process when electromagnetic waves were transmitted into the composite film. The obtained CNF/MXene/FeCo-G composite film possessed a remarkable EMI SE of 58.0 dB and the reflection coefficient (R) as low as 0.61. It was proven that the electromagnetic waves absorbing ability can be enhanced by thickening the transition layers, and the EMI SE was improved with the thickening of the reflection layer. Therefore, this work provided a facile strategy to prepare high EMI SE materials with low reflection, which had a good application prospect as the new-generated smart electronic devices.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yang Wang,Liweng Ma,Feng Xu,Rongkai Ren,Jianzhi Wang,Chen Hou
The novel photocatalytic advanced oxidation catalyst, ZIF-67@MXene-TA-CNF (ZIF-67@MTC) aerogels , was prepared via introducing tannic acid-coated cellulose nanofibril (TA-CNF), two-dimensional layered MXene, and ZIF-67 into a composite aerogel network. Specially, TA assisted the crosslinking of CNF through hydrogen bonds to construct the flexible aerogel skeleton, accompanied by assembly of MXene and ZIF-67. MXene not only provided sufficient attachment sites for the anchoring of ZIF-67, but also can be used as a repository for electron transfer to facilitate the separation of photogenerated electrons and holes. In the peroxymonosulfate (PMS)/aerogels/visible light system, the SO 4 - , OH and 1 O 2 were generated, and 1 O 2 was the main reactive species. As a result, 99.9 % of Tetrabromobisphenol A (TBBPA) can be degraded and the total organic carbon (TOC) removal efficiency reached 81.8 % within 40 min in this system. The results might provide a new concept for the design of biomass aerogels for applications in organic pollutant removal.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinghua Liu,Xuejie Meng,Fan Dong,Suyu Ren,Bo Wang,Feng Tan
Flexible sensors require good tensile properties, flexibility, and enough sensitivity for monitoring and transmitting subtle strain changes in motion. Here, the MXene-sodium alginate-acrylamide (MSA) composite hydrogel was synthesized by polymerization of acrylamide (AM), Ti3C2Tx MXene nanosheets, and sodium alginate (SA). Scanning electron microscopy, energy dispersive spectroscopy, and elemental mapping demonstrated a uniform dispersion of Ti3C2Tx MXene nanosheets in the composite hydrogel regime. The strong hydrogen bonding interactions between Ti3C2Tx MXene nanosheets and SA–AM polymers were verified by Fourier transform infrared spectroscopy and differential scanning calorimetry analysis. The prepared M20S2.5A hydrogel had 4350% limited tensile strain and fractured energies up to 359.51 J m–2 and significant hysteresis in cyclic loading–unloading experiments, indicating its excellent energy dissipation performance. The conductivity of the M20S2.5A hydrogel had a good linear response (1300–3500%) with the stretch distance and a fast response time of 0.27 s. At the same time, MSA hydrogels have high sensitivity (GF = 2.31). These advantages allowed it to real-time monitor the random motion of the human body such as throat swallowing, finger bending, and knee flexion and extension. The present study showed great potentials of the MSA hydrogel in flexible wearable devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
An Gui,Xiuyu Chen,Xiaoyu Zhang,Changchang Shi,Haibo Yi,Yongan Hu,Wei Zeng,Siliang Wang,Limin Ruan,Yi Xiong,Zhiliang Chen
With WO 3 /BiVO 4 /MXene ternary composite layers as a working electrode, a smart volumetric photoelectrochemical system using electrostatic bias voltage inducted by atmospheric electric field was developed. Under single sun illumination and 0.8 V hardwired bias, the current response of the ternary electrode is 1.15 mA cm −2 , which is 1.31 times higher than that of the WO 3 /BiVO 4 electrode, mainly due to the higher charge transfer rate between the MXene layer and the BiVO 4 structure. Further, the response of the ternary electrode increases to 1.39 mA cm −2 at an extra atmospheric electric field of 1100 V m −1 . It can be demonstrated that the effect of the atmospheric electric field can be regarded as an extra hardwired bias of 0.101 V in the system. The experimental results reveal that the native carriers, including inducted electron/holes in MXene and BiVO 4 , and carriers in the electrolyte, are all effectively excited by the electrostatic induction of atmospheric electric field.
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