COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Hang Xu,Xuya Jiang,Keyan Yang,Junchao Ren,Yuhan Zhai,Xiangsheng Han,Hongzhen Cai,Feng Gao
Conductive hydrogels have drawn tremendous attention in the field of artificial intelligence, health monitoring, and soft robotics. However, combining hydrogels with conductivity, self-adhesiveness, low-temperature tolerance, biocompatibility, and biodegradability in green and low-cost ways remains a great challenge. Hence, the conductive MXene nanosheets were introduced into gluten networks by simple cooking inspired processes and solvents exchanged with glycerol/water binary solution to fabricate conductive organohydrogels (GMOH x ). The GMOH x were conductive (5 ×10 −4 S/m), flexible, adhesive to various surfaces (a max lap-shear strength of ~ 45.9 KPa), low-temperature tolerant (conductive and flexible under −20 °C), biocompatible, and easily degradable (degraded in neutral proteinase dispersion within 2 days), which can be applied as epidermal strain sensors to detect both large (e.g., elbow, wrist, and knee bending) and subtle (e.g., swallowing) scale human motions with accurate and long-term stable signals even under sub-zero temperatures.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
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IF 7.664
Xianhong Zheng,Peng Wang,Xiansheng Zhang,Qiaole Hu,Zongqian Wang,Wenqi Nie,Lihua Zou,Changlong Li,Xu Han
Flexible wearable electronics have attracted tremendous interest owing to their potential applications on artificial intelligence, electronic skin, human health monitoring, etc. However, it remains challenging to fabricate electronic textiles (E-textiles) without sacrificing the air/vapor breathability, flexibility and comfortability. To address these issues, we develop a novel surface reconstruction strategy through the facile and scalable pad-drying technology towards the breathable, flexible, highly conductive, bark-shaped MXene/textiles (BMFs). The formation mechanism of bark-shaped morphology is clarified in detail. Benefiting from synergistic effects between the bark-shaped MXene microstructure and porous structure of textiles, BMFs show excellent piezoresistive sensing performance and good electromagnetic interference (EMI) shielding performance. In addition, BMFs achieve remarkable joule heating performance of 146.7 °C at 5 V, which is even superior to the silver nanowire decorated fabrics. This work provides a new approach for the scalable fabrication of E-textiles, and lays the foundation for the next generation wearable electronics.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Min Sang,Shuai Liu,Wenwen Li,Sheng Wang,Jun Li,Ji Li,Shouhu Xuan,Xinglong Gong
Recently, multifunctional materials have attracted tremendous attention in intelligent equipment and human–computer interaction, requiring the integration of electrical conductivity, sensing property and heating management. Herein, conductive MXene is formulated and deposited on the PVDF film surface and followed by integrating PI tape to construct a multifunctional PVDF/MXene/PI wearable electronic. The PVDF/MXene/PI with sandwich structure shows ideal mechanical strength and tensile toughness. Based on the conductive MXene network, PVDF/MXene/PI composite possesses excellent mechanosensation ability, which can sensitively monitor different human movements. Besides, PVDF/MXene/PI composite presents prominent Joule heating capability and achieves a temperature of over 80 ℃ at 6.5 V voltage. Insulated high-temperature resistant PVDF and PI tape as protective layers ensure the stability and safety of PVDF/MXene/PI heater. Moreover, PVDF/MXene/PI composite exhibits outstanding electromagnetic interference shielding effectiveness of 40 dB. Finally, PVDF/MXene/PI multifunctional electronic with fascinating multi-functions shows potential applications in human thermotherapy, human–machine interaction and electromagnetic wave protection.
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CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Qihuang Deng,Wei Xiong,Bingshuang Mao,Maolin Bo,Yefeng Feng
Increasing the dielectric constant of polymer/sulfide ceramic composites by using wide-bandgap semiconducting sulfide ceramic fillers like ZnS is difficult because of their low interface polarization. To increase the dielectric constant, in this study, ternary polymer-based composite films were designed and fabricated using a hybrid filler consisting of shell-like ZnS particles and core-like V 2 C MXene particles. First, V 2 C MXene with a multi-layered structure was synthesized from the simplest raw materials followed by the in-situ hydrothermal growth of ZnS particles around the V 2 C particles. Then, binary polymer/ZnS and ternary polymer/V 2 C–ZnS composites were fabricated, and their dielectric, conductive, and electrical breakdown properties were investigated. Finally, the effect of interfacial bonding between the V 2 C and ZnS phases was investigated by density functional theory calculations, and the contribution of V 2 C/ZnS interfacial bonding to the higher dielectric constant of the ternary composites than that of the binary composites was explained. The ternary composites exhibited balanced electrical properties suitable for energy storage applications. The ternary composite with 10 wt% hybrid filler loading exhibited a high dielectric constant of ~52, a low dielectric loss of ~0.11 at 100 Hz, and a high electrical breakdown strength of ~202 MV m −1 . This study paves the way for the facile fabrication of high-performance composite dielectrics for application in advanced capacitors.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Houbao Liu,Zeya Huang,Tian Chen,Xinqing Su,Yunan Liu,Renli Fu
The novel multifunctional materials with anti-electromagnetic interference (EMI) and effective thermal management are ideal for modern electronic industry. Generally, the EMI shielding effectiveness (SE) and thermal conductivity (TC) of materials can be effectively enhanced by compounding with high electrically and thermally conductive fillers. However, it seems that the high-performance cannot be compensated without sacrificing the high fillers loading. Herein, from one-dimensional silver nanowires (AgNWs) and two-dimensional MXene, three-dimensional MXene/AgNWs aerogels were designed as electric and heat transferring skeletons for epoxy nanocomposites by directional-freezing and freeze-drying methods. The resultant MXene/AgNWs/Epoxy nanocomposites with a low MXene/AgNWs content of 8.2 wt% combine a high electrical conductivity of 1532 S/m, and an exceptional EMI SE value of 94.1 dB with 3 mm thickness at the X-band frequency, as well as an improved TC of 2.34 W/m·K. The fabricated MXene/AgNWs/Epoxy nanocomposites possess excellent comprehensive properties enable valuable applications in electronic devices for EMI shielding and thermal management.
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BIOELECTROCHEMISTRY
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2021
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IF 5.373
Mengmeng Zhang,Lisha Mei,Li Zhang,Xiao Wang,Xiaochen Liao,Xiuwen Qiao,Chenglin Hong
Electrochemical immunoassays are commonly used to detect biomarkers and Ti 3 C 2 MXene anchored CuAu-LDH two-dimensional hydroxide heterojunctions for dual-mode electrochemical immunosensors were fabricated in this work. Layered double hydroxides have a large surface area, high chemical stability, tunable metal composition and interchangeable anions, however, the insulating nature of LDH further limits its catalytic performance. For this reason, Ti 3 C 2 Mxenes were introduced to improve this problem. 2D layers of Ti 3 C 2 Mxenes with large specific surface area and excellent conductivity have been well proven and widely used. And the surface of Ti 3 C 2 Mxenes (due to the presence of abundant surface functional groups), will facilitate the anchoring of metal ions and the nucleation of LDH. In addition, its excellent electrical conductivity will facilitate the electron transfer between Cu 2+ and Cu + . The immunosensor not only showed a heavy square wave voltammetry (SWV) signal. It also exhibited high electrocatalytic activity for H 2 O 2 redox reactions and improves the sensitivity of the Ampere Current (i-t) detection. The CEA immunosensor developed in this study showed a wide linear response (0.0001–80 ng/mL) and the lowest detection limits (SWV: 33.6 fg/mL and i-t: 45.4 fg/mL S/N = 3). The results confirmed the excellent analytical capability of the immunosensor.
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ANALYTICAL CHEMISTRY
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2021
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IF 6.986
Jing Chen,Shuying Li,Ying Chen,Jiao Yang,Jianbin Dong,Xiaoquan Lu
5-Hydroxytryptamine (5-HT) is an important neurotransmitter, and its content in the human body is of great significance to human health. In this study, an l-cysteine-terminated triangular silver nanoplate loaded on a MXene (two-dimensional transition metal carbide or nitride) (Tri-AgNP/l-Cys/MXene) electrochemical sensor was used to detect 5-HT. As an electrically active amino acid with a sulfhydryl group, l-cysteine (l-Cys) forms a more stable Ag–S bond with silver nanoparticles, which can selectively substitute trisodium citrate (TSC) in TSC-capped triangular silver nanoplates (Tri-Ag-NP/TSC). Due to the good conductivity, biocompatibility, and large surface area, MXenes provide a good platform for loading Tri-AgNP/l-Cys. Under optimized conditions, the concentration range for detecting 5-HT with the sensor is 0.5–150 μM, and the limit of detection (LOD) is 0.08 μM (S/N = 3). For detecting 5-HT in actual serum samples, the sensor also showed a good recovery rate (95.38–102.3%), and the relative standard deviation was 2.2–3.4%.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xianwei Geng,Chenguang Liu,Yi Sun,Yingchao Zhao,Ruowei Yi,Pengfei Song,Chun Zhao,Ivona Mitrovic,Li Yang,Cezhou Zhao
Lithium-sulfur (Li-S) batteries hold their promise in renewable next-generation energy storage technologies due to low cost and high theoretical energy. Herein, a Ti 3 C 2 T x MXene-carbon nanocage-sulfur (MXene/CNC/S) cathode is synthesized by a simple process with high conductivity and outstanding performance in Li-S batteries. The cathode with an unusually high sulfur content of 80% demonstrates an eminent initial specific capacity of 1275.5 mAh·g −1 at 0.1 C and retains 823.8 mAh·g −1 after 100 cycles, showing a high retention rate of 64.6%. Besides, it exhibits a great conductive feature for rate performance, delivering 630.5 mAh·g −1 capacity when the current rises to 4 C. In this composition electrode, the excellent electrochemical performance indicates that MXene can effectively adsorb polysulfides to help batteries achieve long-term cyclic performance. On the other hand, the introduction of CNC strongly improves the specific surface area of the cathode and constructs a high conductive network to reduce the stacking of MXene, thus exhibiting better rate performance and increasing utilization of sulfur. Our work holds future technological significance as it could accelerate progress towards lithium-sulfur batteries with high sulfur content and less pricy conductive materials.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Hang Yin,Yuyang Wang,Lixia Ma,Shouren Zhang,Baocheng Yang,Ruibin Jiang
As a promising photoanode material, TiO 2 confronts two challenges, weak visible light absorption and low catalytic activity for water oxidation , which limit its photoelectrochemical performance toward water oxidation. Doping and co-catalyst deposition provide effective ways to extending the light-absorption spectral range and accelerating the water-oxidation kinetics, respectively. Herein, an efficient TiO 2 -based photoelectrode for water oxidation is prepared by Fe doping and electrophoretic Ti 3 C 2 T x deposition. The Fe doping effectively extends the light absorption of TiO 2 toward visible region. Owing to the excellent water oxidation activity of Ti 3 C 2 T x , its deposition greatly accelerates the water-oxidation kinetics, which in turn enhances the photocarrier separation and injection efficiencies. The well-designed Fe-TiO 2 /Ti 3 C 2 T x exhibits a photoelectrochemical current density of 1.23 mA cm −2 at 1.23 V vs. RHE, which is much higher than those of Fe-TiO 2 . The maximum IPCE value is enhanced from 64.7% of Fe-TiO 2 to 92.8% of Fe-TiO 2 /Ti 3 C 2 T x at 380 nm. Our findings provide an effective way to fabricate efficient photoanode for water oxidation and are helpful to understanding the photoelectrochemical performance of hybrid nanostructures.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Anke Wei,Lei Wang,Zhao Li
As a promising high-energy chemical power source, lithium-sulfur batteries have attracted extensive attention due to their high theoretical specific capacity (1675 mAh g −1 ) and high theoretical energy density (2600 Wh kg −1 ). However, some prominent problems restrict the development of lithium-sulfur batteries, including poor intrinsic conductivity of sulfur, larger volume expansion, and the dissolution of polysulfide. Herein, the porous Zn-Co oxide derived from MOFs (metal-organic framework) coated by highly conductive MXene (ZnCo 2 O 4 @Ti 3 C 2 ) is developed as an efficient sulfur immobilizer for lithium-sulfur batteries (LSBs). Benefitting from the high electronic conductivity of MXene, chemical binding sites of metal oxide for polysulfides, and porous structure for ion transfer, the ZnCo 2 O 4 @Ti 3 C 2 /S composite demonstrates a balanced high electrochemical performance. A high initial discharge capacity of 1283.9 mAh g −1 with a high initial coulombic efficiency of 98.7% at a low current density of 0.1 C. In addition, this sample exhibits outstanding cycling performance at a high current density of 0.5 C. The results showed that the design strategy of MOFs-derived materials has great potential to promote the development of high-performance LSBs.
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Nanomaterials
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2021
·Vol. 11
·期 11
·3041
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IF 5.076
Jun Zhou,Junsheng Yu,Dongyu Bai,Huili Liu,Lu Li
In order to overcome the various defects caused by the limitations of solid metal as a shielding material, the development of electromagnetic shielding materials with flexibility and excellent mechanical properties is of great significance for the next generation of intelligent electronic devices. Here, the aramid nanofiber/Ti3C2TxMXene (ANF/MXene) composite films with multilayer structure were successfully prepared through a simple alternate vacuum-assisted filtration (AVAF) process. With the intervention of the ANF layer, the multilayer-structure film exhibits excellent mechanical properties. The ANF2/MXene1 composite film exhibits a tensile strength of 177.7 MPa and a breaking strain of 12.6%. In addition, the ANF5/MXene4 composite film with a thickness of only 30 μm exhibits an electromagnetic interference (EMI) shielding efficiency of 37.5 dB and a high EMI-specific shielding effectiveness value accounting for thickness (SSE/t) of 4718 dB·cm2g−1. Moreover, the composite film was excellent in heat-insulation performance and in avoiding light-to-heat conversion. No burning sensation was produced on the surface of the film with a thickness of only 100 μm at a high temperature of 130 °C. Furthermore, the surface of the film was only mild when touched under simulated sunlight. Therefore, our multilayer-structure film has potential significance in practical applications such as next-generation smart electronic equipment, communications, and military applications.Keywords:multilayer structure;MXene;ANF;electromagnetic interference shielding;thermal insulation
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Shiyan Sun,Xuefeng Sha,Jie Liang,Guang Yang,Xin Hu,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
The adsorption applications of MXene-based adsorbents have intensively investigated recently. However, the performance of MXene-based adsorbents has been largely limited owing to their lack of functional groups and adsorptive sites. Therefore, surface functionalization of MXene is an important route to achieve better performance for environmental adsorption. Herein, polyionic liquid functionalized MXene (named as MXene-PIL) was prepared through a multi-component reaction and adsorptive removal of iodine by MXene-PIL was also evaluated. The successful generation of PIL on MXene was confirmed by a series of characterization measurements. Furthermore, the effects of contact time, iodine concentration, environmental temperature and other factors on the adsorption performance of MXene-PIL were investigated. Adsorption kinetic analysis including pseudo-first-order dynamic model, pseudo-second-order dynamic model and Weber-Morris model, adsorption thermodynamic analysis such as Langmuir and Freundlich models and Van’t Hoff equation were used for further analysis the adsorption behavior of iodine by MXene-PIL. We demonstrated that the adsorption capacity could be as high as about 170 mg/g, which is obviously larger than the unmodified MXene and most of other reported adsorbents. Taken together, a simple strategy has been developed for in-situ generation of PIL on MXene and the resultant composites show potential application for adsorptive removal of iodine.
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