IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 5
·5915-5927
·
IF 4.3
Wenqing Xu,Jun Sun,Lifan Nie,Limei Yang,Xinpeng Di,Long Zhang,Quan Zhou,Gebo Pan
Flexible capacitive pressure sensors (CPSs) have attracted valuable research attention, but there has been a critical challenge for them to simultaneously achieve high sensitivity, wide measurement range, and low cost. Herein, we propose an effective strategy to optimize the sensing performance of the CPSs by fabricating a porous dielectric nanocomposite with high permittivity and low compression modulus. It is innovative for a CPS to construct a dielectric by incorporating the highly conductive surface-silanized MXene (S-MXene) into the highly compressible thermoplastic polyurethane (TPU) porous frame to enhance its permittivity. We used a covalent surface modification method to modify MXene to improve its dispersion and interface adhesion with the matrix TPU. To construct the microporous skeleton, a facile and cost-effective coagulation method was carried out to create abundant porosity in the nanocomposite by non-solvent-induced phase separation. The CPS, assembled by sandwiching the porous dielectric nanocomposite in between two flexible electrodes, exhibits outstanding overall performance of a high sensitivity of 0.24 kPa−1 with a good linearity of 0.98 (<100 kPa), a wide detection range up to 500 kPa, a fast response time of 62 ms, and good functioning durability over 5000 cycles (~50 kPa). The prepared CPS demonstrates an extraordinary capability of real-time human motion monitoring, providing extensive insights into the application of wearable electronic devices, human–machine interfaces, and human healthcare treatment.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qianzhi Chen,Yuxuan Liu,Anli Yi,Zhongyan Man,Rui Jiao,Hanxue Sun,Jiyan Li,An Li
The interfacial solar steam generation for seawater desalination has attracted attention because of its excellent photothermal performance and efficiency. However, the process of preparing evaporators is often complex and costly, which limits their further practicality. Here, we report an integrated solar evaporator that is easy to prepare and has good salt resistance. The porous structure of poly(methyl methacrylate) and polycarbonate (PMMA–PC) films prepared by the breathing figure (BF) method was used as the upper layer, while MXene was deposited on the as-resulted PMMA–PC film and served as a light absorption layer. Meanwhile, the hydrophilicity of the lower layer of expanded polyethylene (EPE) foam can promote the upward transfer of water and inhibit heat loss. Under one solar irradiation, the water evaporation rate of the composite film was found to be 1.79 kg m–2 h–1 in distilled water and 1.67 kg m–2 h–1 in a 15 wt % NaCl solution, exhibiting excellent evaporation performance and salt resistance. In addition, the PMMA–PC/MXene films exhibit excellent mechanical properties. Based on these merits of the PMMA–PC/MXene solar generator, it may find useful applications in practical solar interfacial evaporation. Moreover, the findings of this investigation may provide a new opportunity for the rational design of large-aperture photothermal conversion materials via a simple breathing figure method.
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Advanced Science
·
2024
·Vol. 11
·期 30
·2403551
·
IF 14.3
Chenhui Xu,Zhihui Li,Tianyi Hang,Yiming Chen,Tianlong He,Xiping Li,Jiajia Zheng,Zhiyi Wu
With the onset of the 5G era, wearable flexible electronic devices have developed rapidly and gradually entered the daily life of people. However, the vast majority of research focuses on the integration of functions and performance improvement, while ignoring electromagnetic hazards caused by devices. Herein, the 3D double conductive networks are constructed through a repetitive vacuum-assisted dip-coating technique to decorate the 2D MXene and 1D silver nanowires on the melamine foam. Benefiting from the unique porous structure and multi-scale interconnected frame, the resultant composite foam exhibited high electrical conductivity, low density, superb electromagnetic interference shielding (48.32 dB), and Joule heating performance (up to 90.8 °C under 0.8 V). Furthermore, a single-electrode triboelectric nanogenerator (TENG) with powerful energy harvesting capability is assembled by combining the composite foam with an ultra-thin Ecoflex film and a polyvinylidene fluoride film. Simultaneously, the foam-based TENG can also be considered a reliable wearable sensor for monitoring activity patterns in different parts of the human body. The versatility and scalable manufacturing of high-performance composite foams will provide new design ideas for the development of next-generation flexible wearable devices.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Jin Wang,Yudan Shen,Yuting Zhuang,Jinyi Wang,Yue Zhang
The development of abiotic protein affinity adsorbents remains challenging for the accurate acquisition and analysis of specific protein species. Inspired by bacterial cell walls, a hierarchical hybrid framework is fabricated through the oriented growth of an Fe-based metal organic framework (MOF) on V2C MXene for the efficient separation of lysozyme (Lys). After directed evolution of adsorptive materials, the MXene@MOF composite rich in hydroxyl groups (termed as MX@MOF-DH) is found exerting exceptional affinity for Lys. Benefiting from hydrogen-bonding, coordination, and electrostatic interaction-mediated multimodal and multivalent affinity, MX@MOF-DH reveals rapid adsorption rate (5 min), superb enrichment factor (83.1), and favorable binding capacity (609.7 mg g–1), which outperforms other latest adsorbents. Moreover, femtomolar sensitivity is achieved even in the presence of high-abundant interfering proteins, as confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometer analysis. This work not only provides an efficient approach for selective enrichment of lysozyme but also paves an avenue to construct the protein affinity reagents for specific biological medicine and analysis applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peilong Ji,Li Liu,Qiang Liu,Bingke Li,Shanhao He,Keliang Wu,Xuejun Dong,Zhiyong Liu,Yanlong Tai
Ti 3 C 2 T x MXene is highly compelling as an energy storage material, but 2D MXene sheets experience significant stacking due to hydrogen bonding and van der Waals forces. This blocks active sites and impedes fast electrolyte ion transport. The pseudocapacitance of MXene materials is highly reliant on their terminal groups. Therefore, an effective strategy was designed herein to prepare an oxygen-rich 3D hierarchical porous MXene (P-OR-Ti 3 C 2 T x ). First, Zn powder was used as a template to construct three-dimensional hierarchical porous structures that spanned the microporous, mesoporous, and macroporous scales. Second, Zn powder was used as a metal reducing agent in a reaction at 500 °C to eliminate most −F terminal groups on the MXene. Then, a subsequent acid washing step was used to introduce numerous −O terminal groups. The energy storage process of the prepared MXene was investigated by in situ Raman. More redox active sites (−O terminal groups) are exposed by the constructed oxygen-rich 3D hierarchical porous MXene structure, which also provides a shorter pathway for electrolyte ion transport. P-OR-Ti 3 C 2 T x displays superb rate performance (88.19 % retention at 100 A g −1 ) and ultra-high capacitance (676.7F/g at 2 mV/s and 698.7 F g −1 at 1 A g −1 ) when used as a supercapacitor electrode. Moreover, a symmetric flexible supercapacitor device prepared using P-OR-Ti 3 C 2 T x and carbon cloth achieves a superb energy density of 32.8 Wh kg −1 at a power density of 236.5 W kg −1 . This study offers insight into the design of MXenes that exhibit both high capacity and excellent rate performance.
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Nanoscale
·
2017
·Vol. 10
·期 3
·1111-1118
·
IF 7.367
Xu Chen,Xueke Sun,Wen Xu,Gencai Pan,Donglei Zhou,Jinyang Zhu,He Wang,Xue Bai,Biao Dong,Hongwei Song
Intracellular pH sensing is of importance and can be used as an indicator for monitoring the evolution of various diseases and the health of cells. Here, we developed a new class of surface-functionalized MXene quantum dots (QDs), Ti3C2, by the sonication cutting and hydrothermal approach and further explored their intracellular pH sensing. The functionalized Ti3C2 QDs exhibit bright excitation-dependent blue photoluminescence (PL) originating from the size effect and surface defects. Meanwhile, Ti3C2 QDs demonstrate a high PL response induced by the deprotonation of the surface defects. Furthermore, combining the highly pH sensitive Ti3C2 QDs with the pH insensitive [Ru(dpp)3]Cl2, we developed a ratiometric pH sensor to quantitatively monitor the intracellular pH values. These novel MXene quantum dots can serve as a promising platform for developing practical fluorescent nanosensors.
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ChemistrySelect
·
2024
·Vol. 9
·期 31
·e202402076
·
IF 1.9
Hengyi Cheng,Xun Zhang,Tao Zhang,Yixiang Chen,Dan Yu,Wei Wang
Graphical The figure shows the preparation process of TPU/PDA/MXene composite fibers. TPU fibers were first prepared by dissolving TPU particles in a certain amount of DMF solution, but since TPU fibers are inherently non-conductive, it was necessary to surface modify the TPU fibers. PDA was polymerized in situ on the fiber surface and then placed in MXene solution for ultrasonication to obtain composite fibers. With the development of the ageing society, wearable strain sensors have great application prospects in the fields of health detection, artificial intelligence, and motion recognition. However, traditional forms of film-like strain sensors suffer from low sensitivity, adhesion, and impermeability during use, which severely limit their practical applications. To overcome these problems, we propose a strategy to fabricate polyurethane/polydopamine/MXene (TPU/PDA/MXene) composite fibers by wet spinning. Furthermore, the outside is wrapped with (PDMS), giving mechanical strength and chemical resistance. Through a simple and low-cost wet spinning process, TPU/PDA/MXene fibers are achieved in the preparation of flexible strain sensors, and they can be woven into various forms with good flexibility and comfort according to practical needs. The results indicated that the prepared flexible strain sensor exhibits a high gauge factor (GF) of 57.15 over a large strain range (300 %), which are superior to those of many fiber-based sensors. Their application properties were also measured by attaching them to fingers, wrists and knees, showing high sensitivity, mechanical durability and chemical stability, and has great potential for wearable strain sensors and flexible strain sensors in complex environments.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yafei Liu,Yujie Gui,Ying Lv,Huixia Feng,Xia Zhao,Jianhui Qiu,Xuemei Ma,Yuchen Yang
Hydrogels have unique flexibility and a highly efficient, low-cost manufacturing process, thus they are expected to be used in electronic skin, wearable sensors, soft robotics, and human–computer interaction. However, the application of conductive hydrogels in monitoring large deformations is severely limited by their low mechanical properties and inability to work at low temperature. In this study, MXene/PAM/CMC-Na (MPCE) hydrogel was immersed in a mixed EG/H2O solution to improve the overall performance of the hydrogel, and the dual action of EG and N,N-dimethylformamide in the MXene organic dispersion enhanced its anti-freeze properties. Furthermore, MXene nanosheets can be hydrogen bonded to the entangled polymer network structure, significantly improving the mechanical properties of the MPCE hydrogel. The hydrogel had extremely tensile strength (5023% tensile strain) and excellent freezing resistance (−20 °C). These results demonstrated that the MPCE hydrogel could accurately monitor minute human movements, such as finger flexion, wrist and elbow action, muscle vibration, and eyelid blinking. It can be used as a strain sensor to provide real-time feedback on human movements.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenxuan Zhao,Yiqian Du,Xiaowei Lv,Kaicheng Luo,Chunyang Xu,Min Liu,Yuetong Qian,Xiangyu Wang,Min Wang,Yuxiang Lai,Jiwei Liu,Yifeng Cheng,Ruixuan Zhang,Renchao Che
The construction of heterogeneous microstructure and the selection of multicomponents have turned into a research hotspot in developing ultralight, multifunctional, high-efficiency electromagnetic wave absorbing (EMA) materials. Although aerogels are promising materials to fulfill the above requirements, the increase in functional fillers inevitably leads to the deterioration of intrinsic properties. Tuning the electromagnetic properties from the structural design point of view remains a difficult challenge. Herein, we design customized pore creation strategies via introducing sacrificial templates to optimize the conductive path and construct the discontinuous dielectric medium, increasing dielectric loss and achieving efficient microwave absorption properties. A 3D porous composite (MEM) was crafted, which encapsulated an EVA/FeCoNi (EVA/MNPs) framework with Ti3C2Tx MXene coating by employing a direct heated cross-linking and immersion method. Controllable adjustment of the conductive network inside the porous structure and regulation of the dielectric character are achieved by porosity variation. Eventually, the MEM-5 with a porosity of 66.67% realizes RLmin of −39.2 dB (2.2 mm) and can cover the entire X band. Moreover, through off-axis electronic holography and the calculation of conduction loss and polarization loss, the dielectric property is deeply investigated, and the inner mechanism of optimization is pointed out. Thanks to the inherent characteristic of EVA and the porous structure, MEM-5 showed excellent thermal insulating and superior compressibility, which can maintain 60 °C on a 90–100 °C continuous heating stage and reached a maximum compressive strength of 60.12 kPa at 50% strain. Conceivably, this work provides a facile method for the fabrication of highly efficient microwave absorbers applied under complex conditions.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-10
·
IF 5.3
Feng Lei,Chen Junji,Yang Min,Wang Juan,Yin Shougen,Zhang Deliang,Qin Wenjing,Song Jibin
Ti 3 C 2 T x MXene/Cu x O composites were prepared by acid etching combined with electrochemical technique. The abundant active sites on the surface of MXene greatly increase the loading of Cu x O nanoparticles, and the synergistic effect between the different components of the composite can accelerate the oxidation reaction of glucose. The results indicate that at the working potential of 0.55 V (vs. Ag/AgCl), the glucose sensor based on Ti 3 C 2 T x MXene/Cu x O composite presents large linear concentration ranges from 1 µM to 4.655 mM (sensitivity of 361 µA mM −1 cm −2 ) and from 5.155 mM to 16.155 mM (sensitivity of 133 µA mM −1 cm −2 ). The limit of detection is 0.065 µM. In addition, the sensor effectively avoids the oxidative interference of common interfering species such as ascorbic acid, dopamine and uric acid. The sensor has good reproducibility, stability and acceptable recoveries for the detection of glucose in human sweat sample (97.5-103.3%) with RSD values less than 4%. Based on these excellent properties it has great potential for the detection of glucose in real samples. Graphical abstract
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Leikai Zhao,Rui Zhang,Guixin Yang,Yuhang Wang,Shili Gai,Xin Zhao,Mengmeng Huang,Piaoping Yang
Foreseen as foundational in forthcoming oncology interventions are multimodal therapeutic systems. Nevertheless, the tumor microenvironment (TME), marked by heightened glucose levels, hypoxia, and scant concentrations of endogenous hydrogen peroxide could potentially impair their effectiveness. In this research, two-dimensional (2D) Ti3C2 MXene nanosheets are engineered with CeO2 nanozymes and glucose oxidase (GOD), optimizing them for TME, specifically targeting cancer therapy. Following our therapeutic design, CeO2 nanozymes, embodying both peroxidase-like and catalase-like characteristics, enable transformation of H2O2 into hydroxyl radicals for catalytic therapy while also producing oxygen to mitigate hypoxia. Concurrently, GOD metabolizes glucose, thereby augmenting H2O2 levels and disrupting the intracellular energy supply. When subjected to a near-infrared laser, 2D Ti3C2 MXene accomplishes photothermal therapy (PTT) and photodynamic therapy (PDT), additionally amplifying cascade catalytic treatment via thermal enhancement. Empirical evidence demonstrates robust tumor suppression both in vitro and in vivo by the CeO2/Ti3C2-PEG-GOD nanocomposite. Consequently, this integrated approach, which combines PTT/PDT and enzymatic catalysis, could offer a valuable blueprint for the development of advanced oncology therapies.
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ACS Applied Electronic Materials
·
2024
·
IF 4.3
Hongjian Zhang,Changzhou Du,Yong Zhang
Flexible pressure sensors play a vital role in advancing wearable electronics by enabling precise health monitoring, human-machine interfaces, and environmental sensing. MXene-based piezoresistive sensors have garnered significant attention due to their exceptional electromechanical properties. However, enhancing their performance and ensuring environmental sustainability simultaneously still remain critical challenge. In this study, we prepared hydroxyl-rich deacetylated cellulose acetate (DCA) fibers and attached MXene to the surface to form a three-dimensionally interconnected conductive network. Taking advantage of the typical micromorphology and in turn the high electrical conductivity modulation, the resulting MXene/DCA (MDCA) flexible sensors exhibited exceptionally high sensitivity (54.62 kPa–1), excellent linearity in the range of 0–40 kPa (R2 = 0.998), fast response/recovery time (154/125 ms), and outstanding long-term durability over 10 000 compression cycles at 12.37 kPa without significant degradation. This study offers promising insights into the development of high-performance, environmentally friendly piezoresistive sensors.
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