Nano-Micro Letters
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2022
·Vol. 14
·期 1
·1-14
·
IF 23.655
Liu Liu-Xin,Chen Wei,Zhang Hao-Bin,Ye Lvxuan,Wang Zhenguo,Zhang Yu,Min Peng,Yu Zhong-Zhen
Although electrically conductive and hydrophilic MXene sheets are promising for multifunctional fibers and electronic textiles, it is still a challenge to simultaneously enhance both conductivity and mechanical properties of MXene fibers because of the high rigidity of MXene sheets and insufficient inter-sheet interactions. Herein, we demonstrate a core–shell wet-spinning methodology for fabricating highly conductive, super-tough, ultra-strong, and environmentally stable Ti 3 C 2 T x MXene-based core–shell fibers with conductive MXene cores and tough aramid nanofiber (ANF) shells. The highly orientated and low-defect structure endows the ANF@MXene core–shell fiber with super-toughness of ~ 48.1 MJ m −3 , high strength of ~ 502.9 MPa, and high conductivity of ~ 3.0 × 10 5 S m −1 . The super-tough and conductive ANF@MXene fibers can be woven into textiles, exhibiting an excellent electromagnetic interference (EMI) shielding efficiency of 83.4 dB at a small thickness of 213 μm. Importantly, the protection of the ANF shells provides the fibers with satisfactory cyclic stability under dynamic stretching and bending, and excellent resistance to acid, alkali, seawater, cryogenic and high temperatures, and fire. The oxidation resistance of the fibers is demonstrated by their well-maintained EMI shielding performances. The multifunctional core–shell fibers would be highly promising in the fields of EMI shielding textiles, wearable electronics and aerospace.
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Nano Energy
·
2022
·
IF 19.069
Xiaoping Chen,Yina Liu,Yi Sun,Tianshi Zhao,Chun Zhao,Tawfik A. Khattab,Eng Gee Lim,Xuhui Sun,Zhen Wen
As the existence of interfacial electric field, the surface charges of triboelectric nanogenerators (TENGs) would diffuse into air or tribo-material interior, resulting in the charge decay. Therefore, charge regulation from charge storage is crucial in addition to charge generation. In this work, a MXene/TiO 2 hybrid film has been prepared through partial oxidation of MXene in a contact-separate mode TENG (MT-TENG) as an intermediate layer between negative tribo-material and bottom electrode. It demonstrates the electric outputs of 128 μC/m 2 in charge density, 73.78 μW/cm 3 and 63.78 μW/g in average power density with an energy conversion efficiency of 34.81%. The surface terminals in MXene nanosheets and the oxygen vacancies in TiO 2 nanoparticles provide abundant electron trap sites. Moreover, the energy band bending resulting from the polarization effect of the hybrid film could further hinder the free electrons' drift to the bottom electrode, and consequently prevent the charge recombination. With the synergetic effect of electron storage and polarization, the MT-TENG with an intermediate layer rapidly reaches a charge dynamic equilibrium with a charge density of 80 μC/m 2 . It is expected to provide new insights for material science and structure design from the perspective of charge regulation to improve the output performance of TENGs.
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Nano Energy
·
2022
·
IF 19.069
Ya Cheng,Wendong Zhu,Xiaofeng Lu,Ce Wang
With the rapid development of the electronic industry, undesired electromagnetic (EM) wave radiations and energy shortage crisis pose a great threat to human health, electric devices, and environmental security. Herein, we reported the fabrication of a MXene Ti 3 C 2 T x /carboxymethyl cellulose (MXene/CMC) aerogel as an energy harvester , which can be used for not only harvesting external mechanical energy but also protecting human health from EM wave radiations. An ideal electromagnetic interference (EMI) shielding efficiency of 52.15, 60.31, and 80.36 dB could be achieved in X, Ku, and K bands, respectively. Furthermore, the harvest mechanical energy property of MXene/CMC aerogel-based triboelectric nanogenerator (TENG) was also studied, the peak-to-peak open circuit voltage and short circuit current reached 54.37 V and 1.22 μA, respectively. With the optimal external resistance of 18 MΩ, the power density of the MXene/CMC aerogel-based TENG exhibited 402.94 mW m −2 . It could easily illuminate the commercial light-emitting diode with a bare finger continuously contacting/separating mode. In addition, the MXene/CMC aerogel-based TENG was utilized to monitor human health by attaching MXene/CMC aerogel-based TENG on the differernt huamna dody parts as the self-powered sensor. Therefore, the developed MXene/CMC aerogel in this work presents bright potentials in the fields of harvesting energy , which can detect and protect human health from EM radiation.
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POLYMER TESTING
·
2022
·
IF 4.931
Weihua Meng,Yuying Song,Ke Zhai,Hang Di,Haiyun Ma,Xue Bi,Jianzhong Xu,Lide Fang
Phytic acid (PA)-modified MXene (P-MXene) was prepared combination selective etching with assemble method, and was mixed with epoxy resin (EP) to investigated its flame retardancy, thermal conductivity, conductivity and mechanical properties. P-MXene exhibited two-dimensional single layer structure and had good char-forming property with 86.7% char residue at 800 °C. The cone calorimetry test results showed that P-MXene endowed EP with excellent flame retardancy. Compared with pure EP, the peak heat release rate, peak smoke release rate, peak CO generation rate, and peak CO 2 generation rate of EP composites with 2 phr P-MXene decreased by 38.6%, 31.6%, 38.7% and 40.6%, respectively. The flame retardant mechanism was attributed to physical barrier, catalyzing carbonization effect, oxidative thermal degradation and physical barrier effect. Additionally, the conductivity and mechanical properties of EP composites were slightly reduced. This work provides a promising method to design multifunctional polymers.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Qindan Chu,Hao Lin,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Polymer nanocomposites with excellent electromagnetic interference (EMI) shielding and thermal conductivity (TC) are urgently needed to solve the increasingly serious electromagnetic pollution and heat accumulation in devices. Herein, a distinct strategy was proposed to improve the dispersity of graphene nanoplatelets (GNPs) and integrate cellulose nanofiber (CNF), graphene nanoplatelets (GNPs), and MXene into a layered structure. The presence of MXene can improve the dispersity of GNPs, and the presence of GNPs can protect MXene from oxidation. By combining the excellent electrical conductivity of MXene and the high thermal conductivity of GNPs, the CNF/GNPs/MXene composite films exhibit excellent EMI shielding performance and high in-plane thermal conductivity. The electromagnetic shielding property of the CNF/GNPs/MXene composite films reaches 33.74 dB and the in-plane TC is 8.55 W/(m·K) when the total filler content is 50 wt % while the thickness of the composite film is only 38.5 μm. In addition, the mechanical properties of the composite membrane can meet general requirements. Therefore, these ultrathin CNF/GNPs/MXene composite films show great application potential as effective EMI shielding and thermal management materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Zhipeng Zhang,Bingzhe Wang,Hai-Bing Zhao,Jin-Feng Liao,Zi-Chun Zhou,Tanghao Liu,Bingchen He,Qi Wei,Shi Chen,Hong-Yan Chen,Dai-Bin Kuang,Ying Li,Guichuan Xing
Lead-free double perovskites with superior stability have been considered as promising non-toxic substitutes to their lead-contained counterparts in photocatalysis . However, the severe charge recombination greatly restricts their potential as high-performance photocatalysts. Herein, for the first time, we present a self-assembled heterostructure of lead-free double perovskite Cs 2 AgBiBr 6 nanocrystals (NCs) on the surface of MXene nanosheets via mutual electrostatic attraction. The presence of MXene nanosheets effectively promotes the formation of free charge carriers in Cs 2 AgBiBr 6 NCs via reducing the exciton binding energy. Additionally, the ultrafast photogenerated electron transfer from Cs 2 AgBiBr 6 to MXene with a timescale of 1.1 ps largely prolongs the charge carrier lifetime by two times. As a result of the efficient charge separation and electron extraction, the Cs 2 AgBiBr 6 /MXene heterostructures achieve a high photoelectron consumption yield of 50.6 µmol g −1 h −1 for photocatalytic CO 2 reduction, which surpasses most previously reported lead-free perovskite-based catalysts.
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Nanomaterials
·
2022
·Vol. 12
·期 10
·1776
·
IF 5.719
Wentao Xu,Guoqiang Shu,Shihui Zhang,Lei Song,Kui Ma,Hairong Yue
Titanium dioxide is a mainstream photocatalyst, but it still confronts great obstacles of poor visible light absorption and rapid recombination rate of photogenerated carriers. Herein, we describe the design of a highly active visible-light photocatalytic system of graphited carbon layers anchored V2O5/TiO2heterojunctions derived from Ti3C2MXene, which demonstrates about 4.58 and 2.79 times higher degradation activity of MB under visible light (λ > 420 nm) than pure V2O5and TiO2-carbon. Combined with the characterization results, the formed V2O5/TiO2heterojunction promotes the separation of photogenerated carriers, while the graphitized carbon derived from MXene acts as an electronic reservoir to enhance the absorption of visible light. The ESR results show that superoxide radicals and hydroxyl radicals are the main active species in the reaction system. Therefore, we propose a possible mechanism model to provide a feasible idea for the subsequent design of high-efficiency photocatalysts for environmental treatment.Keywords:MXene;heterojunction;degradation;visible light;photocatalysis
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ELECTROANALYSIS
·
2022
·Vol. 34
·期 10
·1564-1571
·
IF 3.077
Bo Kong,Xiang Yang,Huiqian Dai,Yu Wu,Hong-Bing Lu,Wei Liu,Xiaoying Liu
In this work, an electrochemical sensor was developed based on the delaminated titanium carbide nanosheet (d-Ti 3 C 2 T x ) and fullerene (C 60 ) composite modified glassy carbon electrode (GCE). The composite materials d-Ti 3 C 2 T x /C 60 were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The prepared modified electrode (d-Ti 3 C 2 T x /C 60 /GCE) exhibited commendable electrocatalytic activity for the oxidation of baicalein. Under the optimum detection conditions, the detection of baicalin showed a wide linear range of 0.015–4.0 μM with a detection limit of 0.005 μM. In addition, the d-Ti 3 C 2 T x /C 60 /GCE showed good reproducibility, stability and anti-interference. It was also successfully used for the determination of baicalin in the commercially available Shuanghuanglian oral liquid with satisfactory results.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Huan Xing,Xin Li,Yanli Lu,Yue Wu,Yan He,Qingmei Chen,Qingjun Liu,Ray P.S. Han
Humidity sensing-based wearable respiration monitoring systems have promising application prospects in providing the critical health information. Currently, due to the inherent flexibility and compatibility, fabric-based wearables have attracted tremendous interest in humidity sensing. Herein, we proposed a humidity sensor made from fabric coated with MXene and multi-walled carbon nanotubes (MWCNT). The sensor showed 265% response at 90% relative humidity (RH) and great response stability under deformation. The humidity response of MXene/MWCNT fabric (MC-fabric) sensor only varied 7% under stretch, which is greatly alleviated compared with pristine MXene fabric sensor (35% under stretch). The MC-fabric sensor, integrated into a mask, can accurately identify diverse human respiration patterns despite the deformation caused by motions. This work not only offers a facile modification strategy to enhance the sensing robustness under deformation, but also provides a feasible method for real-time breath analysis.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jiacheng Wei,Dianlun Wu,Chunfa Liu,Fei Zhong,Guibin Cao,Benzhang Li,Chunmei Gao,Lei Wang
Single-walled carbon nanotubes (SWCNTs) show great potential as flexible thermoelectric (TE) materials, however, the low Seebeck coefficients and high thermal conductivities restrict their applications in this field. In this work, taking the advantages of one-dimensional (1D) SWCNTs and two-dimensional (2D) MXenes, a series of three-dimensional (3D) hollow structured SWCNT/MXene films had been prepared for the first time as potent p-Type TE materials. First, compared to that of SWCNTs, the Seebeck coefficients of the composites can be increased due to energy-filtering effect at the SWCNT/MXene interfaces. Holes in the SWCNTs were compensated by electrons from MXenes, leading to a decreased hole concentration, which can also increase the Seebeck coefficients. Second, 3D hollow structures were formed in the composite films, which can decrease the thermal conductivity significantly. Third, contact junctions between SWCNTs and MXenes were formed in the composites, which were beneficial for electron transfer. As a result, at MXene loading of 10 wt%, SWCNT/MXene-10 displayed the highest TE performance. The Seebeck coefficient and ZT value is about 2 times and 20 times higher than that of the neat SWCNTs, respectively. At last, a TE device consists of 10 SWCNT/MXene-10 legs was prepared with a maximum output power of 1.54 µW at temperature difference of 117.3 K. This work provides a facile strategy in designing of SWCNT-based TE materials with high performances.
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ChemistrySelect
·
2022
·Vol. 7
·期 8
·e202104176
·
IF 2.307
Zefeng Zhao,Xukun Qian,Hailin Zhu,Yigao Miao,Hua Ye
Graphical The stability of accordion-like Ti 3 CN MXene in aqueous solutions, ethanol and N , N -dimethylformamide has been investigated. It is revealed Ti 3 CN exhibits limited stability in the aqueous solutions, and transforms to anatase TiO 2 nanoparticles in pH=1 and 7 solutions, and amorphous TiO 2 nanowires in pH=14 solution after a 7-day test at 25 °C. This transformation accelerates when the testing temperature increased to 80 °C. Meanwhile, Ti 3 CN shows excellent stability in ethanol and N , N -dimethylformamide after a 7-day test. MXene materials have shown promising applications in selective separation membranes and many other fields. However, their structural stability which is critically important to applications in the presence of aqueous solutions and organic solvents remains largely unexplored. In this work, we have conducted a systematic study on the synthesis of accordion-like Ti 3 CN MXene and its stability in aqueous solutions, ethanol and N , N -dimethylformamide (DMF). Based on the XRD, SEM and TEM results, 20 % HF acid and an etching time of 24 h is regarded as the optimal parameter to synthesize accordion-like Ti 3 CN MXene. Ti 3 CN MXene exhibits limited stability in the aqueous solutions. Ti 3 CN MXene partially transforms to anatase TiO 2 nanoparticles in pH=1 and 7 aqueous solutions, and amorphous TiO 2 nanowires in pH=14 aqueous solution after a 7-day test at 25 °C. When the testing temperature is increased to 80 °C, this structure transformation rate is increased remarkably. Meanwhile, Ti 3 CN MXene shows excellent stability in C 2 H 5 OH and DMF up to 7-day at 25 and 80 °C, respectively. It is believed that these findings are helpful for guiding the controllable synthesis of Ti 3 CN MXene and seeking the potential applications in the presence of aqueous solutions, ethanol and DMF.
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MATERIALS & DESIGN
·
2022
·
IF 9.417
Ningmin Duan,Zhenyu Shi,Zhaohui Wang,Bin Zou,Chengpeng Zhang,Jilai Wang,Jianren Xi,Xiaoshuai Zhang,Xianzhi Zhang,Guilong Wang
It is a challenge to design Ti 3 C 2 T x MXene-based electromagnetic interference (EMI) shielding composites with excellent mechanical properties. Herein, a highly robust, flexible and durable Ti 3 C 2 T x MXene/carbon fiber fabric/thermoplastic polyurethanes (Ti 3 C 2 T x MXene/CFf/TPU) composite was fabricated through simple electrohydrodynamic atomization deposition, layer-by-layer stacking and hot pressing technology. The synergistic strengthening effect of van der Waals forces and covalent bonds can improve the tensile strength of the composite up to170.2 MPa, which is far greater than that of other MXene-based composites previously reported. In addition, the EMI shielding performance of the Ti 3 C 2 T x MXene/CFf/TPU composite also improved with increasing MXene mass fraction, reaching 40.4 dB, which can be attributed to the dielectric loss provided by conductive fillers and the enhanced absorption within the sandwich structure. More interestingly, the composite retained excellent resistance stability, EMI-SE stability and flexibility, even after multiple bending and releasing cycles. This work provides a facile and environmentally-friendly method for preparing composites with excellent EMI shielding properties and mechanical properties, which may provide more possibilities for applications in intelligent wear and electronic wireless communication equipment.
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