ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lin Wang,Meiyun Zhang,Bin Yang,Jiaojun Tan
Developing one-dimensional fiber-based sensors to meet the requirement of spinnability, portability, flexibility, and easeful conformability in smart wearable devices has attracted increasing interest. Here, we report highly conductive MXene@aramid nanofibers (ANFs) with a distinct skin-core structure by the wet spinning method. MXene, an emerging 2D conductive material, is applied to build internal conductive paths. ANF frameworks function as protective and skeleton structures to reduce the fiber oxidation probability and achieve superior strength. The obtained MXene@ANF fiber with superior conductivity (2515 S m–1) and tensile strength (130 MPa) works as a promising sensor for smart fabrics to detect different human movements with abundant detection motions, fast response time (100 ms), and long service life (up to 1000 cycles). Benefiting from its high flexibility, it can be sewn into textile and gloves as a smart wearable device. Besides superior thermal stability, it shows promising electrothermal properties with wide heating temperature (25–123 °C) and fast heating temperature (10 s). Therefore, the MXene@ANF fiber with the skin-core structure shows great potential as a promising sensor to be applied in electric heating and smart wearable fabrics.
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Materials Today Physics
·
2021
·
IF 9.298
Fengqi Qi,Lei Wang,Yali Zhang,Zhonglei Ma,Hua Qiu,Junwei Gu
Lightweight and robust electromagnetic interference (EMI) shielding materials are highly desirable in high-end precision electronic components and 5G communication system . Herein, the starch based porous carbon foam (PCF) is prepared by yeast fermentation, steam foaming and carbonization approach with flour as raw material. The Ti 3 C 2 T x MXene/PCF (MPCF) composites are then fabricated via vacuum assisted impregnation of Ti 3 C 2 T x MXene followed by freeze drying. The obtained PCF presents excellent compression strength and superior electrical properties. The compression strength and electrical conductivity ( σ ) of the PCF carbonized at 1400 °C are 4.9 MPa and 21.8 S/cm, respectively. The MPCF composites with 8.5 wt% Ti 3 C 2 T x MXene exhibits superior EMI shielding effectiveness (EMI SE) and specific shielding effectiveness (SSE, EMI SE/ ρ ) of 75 dB and 216.9 dB cm 3 /g, respectively. Meanwhile, the MPCF composites possess excellent flame retardancy and outstanding heat insulation performances, and can be applied in the extreme environments. The resultant lightweight, robust and multifunctional MPCF composites with simple fabrication processes show broad application prospects for EMI shielding systems in aerospace, military engineering, electrical and electronics fields.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Fanrong Ai,Chaojun Fu,Guojun Cheng,Huanhuan Zhang,Yingchun Feng,Xiluan Yan,Xiangjuan Zheng
As an emerging zero-dimensional nanomaterial, MXene quantum dots (MQDs) have aroused the interest of researchers because of their unique physical and chemical characteristics. Here, a straightforward hydrothermal strategy was used to successfully produce the amino-functionalized Ti3C2 MQDs. The functionalized Ti3C2 MQDs exhibited bright blue fluorescence (FL), which was derived from its size effect and surface defects. In addition, Ni2+ can bind to the amino groups on the surface of Ti3C2 MQDs. The absorption of the excitation light by the light-absorbing substance causes nickel ions to effectively quench the photoluminescence of Ti3C2 MQDs, which can be explained by the internal filter effect (IFE). At the same time, the strong affinity of histidine (His) for Ni2+, which is absorbed by His to form a stable complex, causes Ni2+ to dissociate from the Ti3C2 MQD surface and restore the FL. Thus, a fluorescent sensor for detecting the His content in serum was developed. Overall, this work provides a method for the detection of His and shows that the Ti3C2 MQDs have great potential in biomedical and biosensing applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yixiang Chen,Yu Jiang,Wanqi Feng,Wei Wang,Dan Yu
The flexible mechanical sensors that can detect body parameters in real time have been applied in many fields of soft robots, human activity monitoring and health diagnosis. High sensitivity and durable stably signal output are two key factors in strain sensors. The MXene-based materials received extensive attention recently owing to their high conductivity and sense performance, however, poor inherent oxidation resistance properties and weak binding force of MXene-based composite materials always hinder the signal stability. Herein, we propose a facile strategy to prepare polydopamine-modified MXene nanosheets (PMXene) with good oxidation resistance through in situ polymerization, and then it was uniformly loaded on thermoplastic polyurethanes-carbon nanotube (TPU-CNT) nanofibers . Due to the adhesion and interaction between PMXene, CNTs and doped Ni ion , an effective 1D/2D double conductive network is realized in as-prepared flexible sensors. The resultant sensor shows high sensitivity of 9.25, a tunable detection range at 100% strain, and reliable signal ability over 900 cycles. Furthermore, the adhesive dopamine layer effectively isolates oxygen and ensures the stability of the devices. Notably, the sensor can be employed to recognize various human joint motions and detect the physiological signal of swallowing and vocalization, exhibiting the promising potential of the strain sensor in wearable electronics.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chenyang Cai,Zechang Wei,Leixin Deng,Yu Fu
Assembling MXene two-dimensional (2D) nanosheets solely into structurally robust three-dimensional (3D) multifunctional macroarchitectures with temperature-invariant elasticity is significant for widening their potential applications but has remained exceedingly challenging. To this end, a facile freeze-induced co-assembly was developed to allow the disparate integration of MXene 2D nanosheets into the directive heterogeneities to easily customize the controllable 3D architectures for geometry accessibility, structure integrity, and function adaptability. With functionalized cellulose nanocrystal serving as a structural modifier and cross-linking by polyurethane as well as manipulating the directionally ice templating process, multilevel nanostructured configurations with interconnected porous channels could be obtained for biomimetic aerogel electrodes across multiple length scales. Benefiting from the high ion pathway from the low-tortuosity topology, MXene aerogels showed outstanding electrochemical property (225 F/g), high-rate capacity, and temperature-invariant superelasticity (from 0 to 150 °C), which surpassed some of the best reported values. MXene quasi-solid-state supercapacitors presented superior electrochemistry (energy density: 38.5 μWh/cm2) and outstanding cycle ability (86.7% after 4000 cycles). Exhibiting excellent photoresponse capacity, they could be used as an integrated photodetector. More importantly, specially designed bio-mimicking structures with mechanically self-adaptive resilience could promote MXene 3D aerogels to apply in wearable electronic devices, monitoring various human motions. This work will shed light on MXene aerogels for smart and self-powered lightweight electronics.
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Small Methods
·
2021
·Vol. 6
·期 2
·2101051
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IF 14.188
Qikun Wei,Guorui Chen,Hong Pan,Zongbiao Ye,Christian Au,Chunxu Chen,Xun Zhao,Yihao Zhou,Xiao Xiao,Huiling Tai,Yadong Jiang,Guangzhong Xie,Yuanjie Su,Jun Chen
Electrode microfabrication technologies such as lithography and deposition have been widely applied in wearable electronics to boost interfacial coupling efficiency and device performance. However, a majority of these approaches are restricted by expensive and complicated processing techniques, as well as waste discharge. Here, helium plasma irradiation is employed to yield a molybdenum microstructured electrode, which is constructed into a flexible piezoresistive pressure sensor based on a Ti 3 C 2 T x nanosheet-immersed polyurethane sponge. This electrode engineering strategy enables the smooth transition between sponge deformation and MXene interlamellar displacement, giving rise to high sensitivity (1.52 kPa −1 ) and good linearity ( r 2 = 0.9985) in a wide sensing range (0–100 kPa) with a response time of 226 ms for pressure detection. In addition, both the experimental characterization and finite element simulation confirm that the hierarchical structures modulated by pore size, plasma bias, and MXene concentration play a crucial role in improving the sensing performance. Furthermore, the as-developed flexible pressure sensor is demonstrated to measure human radial pulse, detect finger tapping, foot stomping, and perform object identification, revealing great feasibility in wearable biomonitoring and health assessment.
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Biomedical Optics Express
·
2021
·Vol. 12
·期 11
·7051-7063
·
IF 3.732
Wenjie Li,Yinping Miao,Tuan Guo,Kialiang Zhang,Jianquan Yao
An optofluidic system based on photothermal spectroscopy is proposed, which combines molecular photothermal effect with Nb2CTx MXene-tilted fiber Bragg grating (TFBG) for the detection of organophosphorus pesticides (OPs) with temperature compensated. Under the irradiation of excitation light, the photothermal effect of OPs produces a detectable change in the refractive index of the sample, and the concentration of chlorpyrifos can be quantified using TFBG. The Nb2CTx MXene coated TFBG allow more molecules to be absorbed on the surface of TFBG, which enhances the interaction between light and matter, and improves the sensitivity of detection. The temperature compensation is performed by referring to the core mode of TFBG, thereby eliminating the influence of ambient temperature on the photothermal detection. The experimental results show that the sensitivity reaches 1.8 pm/ppm with a limit of detection (LOD) of 0.35 ppm, and the obtained temperature compensation coefficient is 4.84 ppm/°C. This photothermal biosensor has the advantages of low LOD, temperature compensation and real-time online monitoring, making it a good candidate in medicine, chemistry and environmental monitoring.
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ANALYST
·
2021
·Vol. 146
·期 24
·7593-7600
·
IF 4.616
Ling Lei,Caoling Li,Wensheng Huang,Kangbing Wu
Developing a sensitive and rapid detection method for 4-chlorophenol (4-CP) and 4-nitrophenol (4-NP) is very important due to their high toxicity. In this work, bulk Ti3AlC2 powder was etched to Ti3C2Tx for the first time through a hydrothermal reaction in NaF/HCl solution. After ultrasonication in N-methylpyrrolidone (NMP), Ti3C2Tx powder was successfully exfoliated into multilayered Ti3C2Tx nanosheets (i.e. Ti3C2Tx MXene). The prepared Ti3C2Tx MXene not only has a large electrochemical surface area for the oxidation of 4-CP and 4-NP, but also lowers their electron transfer resistance. As a result, the oxidation signals of 4-CP and 4-NP are significantly improved on the surface of the Ti3C2Tx MXene. Based on the remarkable signal amplification of the Ti3C2Tx MXene, a sensitive and rapid method was developed for the simultaneous detection of 4-CP and 4-NP. The linear range is from 0.1 to 20.0 μM for 4-CP, and from 0.5 to 25.0 μM for 4-NP, with detection limits of 0.062 μM (4-CP) and 0.11 μM (4-NP). This method was used in wastewater samples, and the accuracy was confirmed to be good by high-performance liquid chromatography.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiao Li,Caiyue Wen,Liting Yang,Ruixuan Zhang,Yuesheng Li,Renchao Che
The unique 2D/2D heterostructures can fully combine their respective 2D properties and exhibit enhanced performance due to its synergistic effect. However, how to effectively introduce other foreign 2D materials on the 2D MXene substrate, as well as research on their detailed synergistic effects, is still in lack. Herein, 3D conductive interconnected network with massive 2D/2D heterostructures in MXene-MoS 2 composites are constructed by a facile hydrothermal reaction , and the microwave absorption mechanism accompanying the synergistic effect is detailed analyzed. Impressively, the unique off-axis electron holography is firstly used to visually characterize the distribution of charge density at the 2D interface, which constructs an effective relationship between the charge density distribution at the 2D/2D heterostructures and the strength of the microwave absorption performance. In addition, the confined space provided by each independent accordion-like multilayered MXene facilitates the heterogeneous coupling between the layers to increase its dielectric loss capability. Accordingly, the MXene-MoS 2 composite holds the excellent microwave absorption performance accompanied by the superior reflection loss (RL) (−46.72 dB) and the distinct effective absorption bandwidth (EAB) (4.32 GHz) at only 2 mm thickness. This work refers an archetype for studying the synergistic effect between 2D/2D heterostructures.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Saisai Li,Xin Geng,Chang Ma,Xia Zhan,Jiding Li,Mingguo Ma,Jing He,Luying Wang
Lignosulfonates are a by-product of the agricultural and forestry waste and paper industries. Strengthening the sustainable use of lignosulfonates is a problem to be solved. In this study, hydrophilic agricultural and forestry waste calcium lignosulfonate (CaLS) was combined with single/double-layered MXene , and added to the natural polysaccharide sodium alginate (SA) to prepare a pervaporation me, membrane with a three-component hybrid structure. Characterization experiments such as scanning electron microscopy and contact angle demonstrated that CaLS increased the hydrophilicity and reduced swelling of the membrane, and MXene formed a layered cross-sectional morphology that further reduced swelling. A 90% ethanol aqueous solution was used to evaluate the dehydration performance of the membrane. The results showed that the permeation flux and separation factor of the membrane increased by 74% and 160%, respectively. Compared to the pure SA membrane after CaLS was incorporated. MXene further improved the pervaporation performance of the MXene@CaLS/SA membrane, with the permeation flux of about 938 g·m −2 ·h −1 , and the separation factor of 4612 (two and four times higher than the pure SA membrane, respectively). This study provides a theoretical and technical basis for the development of new separation materials, and will help expand the high-value utilization of lignosulfonates.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Dong Wen,Xiang Wang,Lu Liu,Cong Hu,Cheng Sun,Yiran Wu,Yinlong Zhao,Jianxin Zhang,Xudong Liu,Guobing Ying
MXene is a generic name for a large family of two-dimensional transition metal carbides or nitrides, which show great promise in the field of transparent supercapacitors. However, the manufacturing of supercapacitor electrodes with a high charge storage capacity and desirable transmittance is a challenging task. Herein, a low-cost, large-scale, and rapid preparation of flexible and transparent MXene films via inkjet printing is reported. The MXene films realized the sheet resistance (Rs) of 1.66 ± 0.16 MΩ sq–1 to 1.47 ± 0.1 kΩ sq–1 at the transmissivity of 87–24% (λ = 550 nm), respectively, corresponding to the figure of merit (the ratio of electronic to optical conductivity, σDC/σOP) of ∼0.0012 to 0.13. Furthermore, the potential of inkjet-printed transparent MXene films in transparent supercapacitors was assessed by electrochemical characterization. The MXene film, with a transmittance of 24%, exhibited a superior areal capacitance of 887.5 μF cm–2 and retained 85% of the initial capacitance after 10,000 charge/discharge cycles at the scan rate of 10 mV s–1. Interestingly, the areal capacitance (192 μF cm–2) of an assembled symmetric MXene transparent supercapacitor, with a high transmittance of 73%, still surpasses the performance of previously reported graphene and single-walled carbon nanotube (SWCNT)-based transparent electrodes. The convenient manufacturing and superior electrochemical performance of inkjet-printed flexible and transparent MXene films widen the application horizon of this strategy for flexible energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiu-Xiang Yang,Wen-Bei Yu,Chao-Fan Li,Wen-Da Dong,Li-Qi Jiang,Na Zhou,Zhi-Peng Zhuang,Jing Liu,Zhi-Yi Hu,Heng Zhao,Yu Li,Lihua Chen,Jinguang Hu,Bao-Lian Su
Increasing the separation efficiency of photogenerated carriers and preventing the hydrogen back oxidation are two key challenges in photocatalytic hydrogen production. Herein, we report a promising PtO@Ti 3 C 2 /TiO 2 photocatalyst to overcome these two challenges by in-situ growing TiO 2 nanosheets on Ti 3 C 2 MXene (to improve charge separation) and depositing PtO nanodots (to diminish hydrogen back reaction) for enhanced photocatalytic hydrogen production. Within this design principle, the photogenerated electrons and holes in the PtO@Ti 3 C 2 /TiO 2 composites flow in opposite direction into PtO and Ti 3 C 2 respectively, resulting in effective separation of the photogenerated electrons and holes. Beyond, the higher oxidation state of PtO nanodots also largely suppresses the undesirable hydrogen back oxidation reaction. Thereby the PtO@Ti 3 C 2 /TiO 2 composite demonstrates remarkable hydrogen production efficiency. Our work here indicates that rational design of dual co-catalysts could not only promote the separation of photogenerated carriers for enhanced hydrogen production, but also inhibit the reverse reaction of hydrogen production.
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