COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Miao Qin,Wenfeng Yuan,Xiumei Zhang,Yizhu Cheng,Mengjie Xu,Yan Wei,Weiyi Chen,Di Huang
Conductive hydrogels based on MXene have gained more attention due to the excellent conductive property and biocompatibility. At present, they have great potential in electronic skins, personally healthcare monitoring and human motion sensing. However, MXene are prone to be oxidized due to the abundant hydroxyls , which results in the unstable conductive property of hydrogel. To improve the shortcoming, conductive PAA/PAM/MXene/TA hydrogel was prepared, in which the introduction of TA can prevent MXene from oxidation owing to the great deal of pyrogallol groups. Mechanical tests showed that the tensile strength , toughness and elongation at break of PAA/PAM/MXene/TA hydrogel are 0.251 ± 0.05 MPa, 0.895 ± 0.16 MJ/m 3 and 560.82 ± 19.56%, respectively, indicating the hydrogel possess good stretchability. In addition, the MXene and TA were introduced into hydrogel through hydrogen bonds , which endow the hydrogel with good restorability and self-healing property. Resistance variation-strain curves demonstrated that the introduction of MXene endue the hydrogel with appreciable sensing performances. Moreover, in vitro cytotoxicity assay indicated that the hydrogel has good biocompatibility. In conclusion, PAA/PAM/MXene/TA hydrogel has great potential in flexible wearable sensor field.
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Membranes
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2022
·Vol. 12
·期 4
·368
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IF 4.562
Yi Wang,Yuqi Nie,Chunhong Chen,Hongjie Zhao,Ye Zhao,Yujin Jia,Jun Li,Zhanguo Li
MXene nano-sheets were introduced into a thin-film composite membrane (TFC) to reduce the mass transfer resistance (concentration polarization) and improve the membrane performance. The process entailed dissolving the MXene nano-sheets in a membrane casting solution using the blending method and introducing them into the porous support layer to prepare a modified thin-film composite forward osmosis (TFC-FO) membrane. The results showed that the water contact angle decreased by about 16%, indicating that the hydrophilicity was strengthened, and the O/N ratio of the active selective layer decreased by 13%, indicating an increased degree of crosslinking, thereby demonstrating that the introduction of MXene nano-sheets changed the properties of the membrane and played a positive role in its physicochemical properties. In contrast to the unmodified TFC-FO membrane, the modified membrane had a slightly higher reverse solute flux, while its water flux increased by about 80%. Its specific reverse osmosis flux was also significantly optimized (only 0.63 g/L). In conclusion, adding MXene nanosheets to TFC-FO membranes led to the modified membranes with better mass transfer, lessened internal concentration polarization (ICP), and better osmotic separation.Keywords:TFC-FO membrane;MXene nano-sheets;internal concentration polarization
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Xianhong Zheng,Yong Wang,Wenqi Nie,Zongqian Wang,Qiaole Hu,Changlong Li,Peng Wang,Wei Wang
Wearable electronics have attracted much attention in recent years, and textiles have been considered as the desirable substrate. However, it remains a critical challenge to fabricate electronic textiles that are multifunctional, breathable, highly conductive, and elastic. Herein, we develop a novel chemical polymerization and coating strategy to construct interconnected networks of polyaniline (PANI) nanoarrays and MXene on the fiber surface. The fabricated PANI nanoarrays/MXene modified rib knitting fabric exhibit low electrical resistance and good elasticity. The all-solid-state PANI/MXene fabric-based supercapacitors show a high specific capacitance and energy density of 647 mF/cm 2 and 8.08 μWh/cm 2 , respectively, which is higher than most MXene-based textiles. Moreover, the PANI/MXene fabrics demonstrate anisotropic yet exceptional strain sensing performance, including high sensitivity (gauge factor, 435.0), linearity (>0.9), and wide range (0–40.8%), which enables them as wearable sensors to detect large human motions accurately. This work provides a new approach to accomplishing high-performance textile-based wearable electronics.
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ACS Applied Nano Materials
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2022
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IF 6.14
Qiong Zhang,Dewen Xu,Yunfa Si,Renxin Xu,Bailu Luo,Shuangyuan He,Dan Liu
As a recently emerging 2D material, Ti3C2TX MXene, with some distinct characters, might bring opportunities for developing advanced microwave absorption materials (MAMs). Although the multilayered MXene with an accordion-like structure has been used as the building blocks to obtain composite MAMs, the exfoliated MXene (eMXene) nanosheets have rarely been explored. Herein, we construct a hierarchically structured MXene-based composite by simultaneously decorating magnetic nanosheets/particles onto eMXene sheets for an efficient microwave absorption. Systematic ex situ characterizations reveal that the eMXene sheets can act as a structure-directing agent and host to allow an interlaced growth of ultrathin CoO nanosheets and spherical Co@C nanoparticles onto their surfaces. Such structural design impedes the agglomeration of eMXene sheets and magnetic nanounits while guaranteeing the adequate exposure of polar functional groups on MXene surfaces. Meanwhile, the introduction of dual magnetic phases enables an additional magnetic loss capability and also builds massive void spaces and rich heterointerfaces between various nanounits for a significantly enhanced dielectric polarization loss, resulting in a superior impedance matching and attenuation capability. Accordingly, the optimal composite exhibits a minimum reflection loss of −73.4 dB at a thin thickness of 2.1 mm and an effective absorption bandwidth up to 5.6 GHz (12.4–18.0 GHz) at a thin thickness of 1.8 mm. This study might stimulate the further development of exfoliated MXene-based composite microwave absorbers with hierarchical structures.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yujie Gao,Yuanhao Dong,Shuting Yang,Anchun Mo,Xin Zeng,Qianming Chen,Qiang Peng
Developing antibiotics-independent antibacterial materials is of great importance for combating drug-resistant bacteria, such as methicillin-resistant Staphylococcus aureus (MRSA). MXene (transition metal carbides and nitrides), a class of novel 2D nanomaterials , has shown great potentials in biomedical areas. However, the effect of MXene size on its properties and bioactivity is still unknown. Herein, we report for the first time that the antibacterial photothermal therapy efficacy of Ti 3 C 2 T x MXene nanosheets is size-dependent. Three MXene suspensions with small size of 196 nm (MX-s), medium size of 347 nm (MX-m) and large size of 497 nm (MX-l) were prepared via ultrasonication. Upon NIR irradiation for 5 min, the temperature of MXene suspensions (10 μg/mL) increased to 64, 60 and 56 °C for MX-s, MX-m and MX-l, respectively. Accordingly, the viability loss of MRSA induced by MX-s, MX-m and MX-l under NIR was 93%, 69% and 56%, respectively. The in vivo study in the MRSA-infected mouse model showed that the photothermal therapy efficacy of MX-s was comparable to that of the positive control vancomycin . This is the first report on the size-dependent photothermal effect and photothermal antibacterial activity of MXene, which may guide the development of MXene-based therapeutics in the future. In addition, the drug-free antibacterial therapy has great implications for the treatment of antibiotics-resistant bacteria infections.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Rui Zhou,Bo Tu,Dacheng Xia,Hanping He,Zhiwei Cai,Nan Gao,Gang Chang,Yunbin He
Accurate measurement of dopamine (DA) is of great significance for human health monitoring and disease prevention. Herein, two-dimensional Ti 3 C 2 T x MXene with high performance was prepared by layer liquid exfoliation method and used for the modification of gate electrode. The glassy carbon electrode (GCE) modified with Pt/Ti 3 C 2 T x was used as the gate, and assembled with monolayer graphene channel to form a complete transistor device. The device combines the amplification effect of transistors, good electrical conductivity of Ti 3 C 2 T x MXene and excellent catalytic properties of Pt nanoparticles , showing a low detection limit (50 nM) and a wide detection concentration range (50 nM-9 mM) of DA. Ti 3 C 2 T x MXene not only provides a large number of attachment sites for the deposition of Pt nanoparticles , but also improves the electrical conductivity and hydrophilicity of the electrode material , thus enhancing the sensitivity of the device and facilitating the penetration of the solution to be measured. In addition, Ti 3 C 2 T x MXene is negatively charged, it has a certain electrostatic adsorption effect on protonated DA and electrostatic repulsion effect on negatively charged interfering substances. As a result, the device exhibits good selectivity , which provides a great application prospect for the construction of DA sensing platform.
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National Science Review
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2022
·Vol. 9
·期 7
·
IF 23.178
Zhu Yuanyuan,Zheng Shuanghao,Lu Pengfei,Ma Jiaxin,Das Pratteek,Su Feng,Cheng Hui-Ming,Wu Zhong-Shuai
MXenes are one of the key materials for micro-supercapacitors (MSCs), integrating miniaturized energy-storage components with microelectronics. However, the energy densities of MSCs are greatly hampered by MXenes’ narrow working potential window (typically ≤0.6 V) in aqueous electrolytes. Here, we report the fabrication of high-voltage MXene-MSCs through the efficient regulation of reaction kinetics in 2D Ti3C2Tx MXene microelectrodes using a water-in-LiCl (WIL, 20 m LiCl) salt gel electrolyte. Importantly, the intrinsic energy-storage mechanism of MXene microelectrodes in WIL, which is totally different from traditional electrolytes (1 m LiCl), was revealed through insitu and exsitu characterizations. We validated that the suppression of MXene oxidation at high anodic potential occurred due to the high content of WIL regulating anion intercalation in MXene electrodes, which effectively broadened the voltage window of MXene-MSCs. Remarkably, the symmetric planar MXene-MSCs presented a record operating voltage of 1.6 V, resulting in an exceptionally high volumetric energy density of 31.7 mWh cm−3. With the ultra-high ionic conductivity (69.5 mS cm−1) and ultralow freezing point (−57°C) of the WIL gel electrolyte, our MSCs could be operated in a wide temperature range of −40 to 60°C, and worked for a long duration even at −40°C, demonstrative of its practicality in extreme environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shasha Zheng,Huijie Zhou,Huaiguo Xue,Pierre Braunstein,Huan Pang
The poor conductivity, unsatisfactory stability and easy aggregation of metal–organic framework (MOF) nanomaterials have been recognized as the main reasons that prevent their practical application. Here, we report the highly conductive and cyclic-stable Ti 3 C 2 MXene@pillared-layer [Ni(thiophene-2,5-dicarboxylate)(4,4′-bipyridine)] n MOF composites (MXene@Ni-MOF). Based on the hard-soft-acid-base principle, the pillared-layer Ni-MOF porous structure with Ni-N coordination bonds confer better structural stability. The Ni-MOF nanosheets are immobilized by the MXene , leading to fast charge transfer between the Ni-MOF and MXene, solving the problem of poor conductivity of Ni-MOF, while avoiding the agglomeration of Ni-MOF nanosheets. Moreover, the strong interaction between the organic ligands of Ni-MOF and surface functional groups of MXene plays a key role: it reduces the exposure of surface groups of MXene, limits the oxidation of MXene, and increases its layer spacing, thus facilitating the rapid ion transport. The MXene@Ni-MOF exhibits a high specific capacitance (979 F g −1 at 0.5 A g −1 ) and the new aqueous asymmetric supercapacitor device displays an excellent cycling property with only 2% decay after 5000 cycles.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 7
·2355-2362
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IF 4.478
Zhao Xueqi,Zhang Yue,Wang Xinghua,Ma Pinyi,Song Daqian,Sun Ying
Long-range surface plasmon resonance (LRSPR) has demonstrated excellent performance in sensing and detection, due to its higher accuracy and sensitivity compared with conventional surface plasmon resonance (cSPR). In this work, we establish an LRSPR biosensor which employs PDA/Ti 3 C 2 -MXene/PDA-gold film as a sensing substrate and gold nanoparticles (AuNPs) as enhancers. Ti 3 C 2 -MXene is an emerging two-dimensional (2D) layered material which is used extensively in immunoassay and biosensing. The sensing substrate comprises two polydopamine (PDA) films between which is sandwiched a Ti 3 C 2 -MXene film based on a gold film, which provides a large surface area and abundant binding sites to rabbit anti-human IgG (Ab 1 ). Sandwich amplification is adopted to enhance the sensitivity of the LRSPR biosensor, and AuNPs/staphylococcal protein A (SPA)/mouse anti-human IgG (Ab 2 ) composites are introduced into the flow cell as enhancers after the immune binding of human IgG to Ab 1 . The antigen (human IgG) detection range is 0.075 μg mL −1 to 40 μg mL −1 , and the limit of detection is almost 20 times lower than that for cSPR biosensors. This novel LRSPR biosensor demonstrates excellent performance in immune sensing over a broad detection range and a low limit of detection. Subsequent modification of the LRSPR sensing platform could be made for extensive application in various biological detection fields. Graphical abstract
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MATERIALS LETTERS
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2022
·
IF 3.574
Long Zhang,Lifan Nie,Shaohui Zhang,Zhaobo Dong,Quan Zhou,Ziang Zhang,Ge-Bo Pan
High permittivity nanocomposites have recently received extensive attention for their potential applications in energy storage and flexible electronics. In this paper, 2D conductive MOF Ni 3 (HHTP) 2 was modified onto the MXene nanosheets for fabricating high permittivity poly (vinylidene fluoride) (PVDF) nancomposites with low dielectric loss. The SEM, TEM and XRD results confirm the Ni 3 (HHTP) 2 MOF was grafted on MXene nanosheets successfully. The MOF-MXene/PVDF nanocomposite exhibits a high permittivity of 530 with dielectric loss of 0.49 at 4.76 wt% under 1 kHz.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Hou-Qing Wang,Jing-Wen Wang,Xin-Zhu Wang,Xin-Hua Gao,Guo-Chao Zhuang,Jian-Bao Yang,Hua Ren
Hybrid nanofillers designed for polymer dielectric nanocomposites are expected to obtain excellent dielectric energy storage performance by virtue of different morphologies and electrical properties. In this work, the 2D/2D heterostructures of 2D MoS 2 grown on the surface of 2D transition metal carbide Ti 3 C 2 MXene (MoS 2 @MXene) have been successfully obtained through hydrothermal reaction. MoS 2 @MXene was incorporated into poly (vinylidene fluoride) (PVDF) to form the PVDF based dielectric composites (MoS 2 @MXene/PVDF) through solution casting method. The composite with 3.47 wt% MoS 2 @MXene is very flexible with an elastic modulus of 385 MPa, which is not much different with pure PVDF (357 MPa). The maximum electric displacement at room temperature and an electric field of 400 MV/m is 10.96 μC/cm 2 , moreover the discharged energy density reaches 17.22 J/cm 3 , which is nearly 4.5 times that of pure PVDF (3.83 J/cm 3 at the maximum electric field of 250 MV/m). The dielectric constant of 3.47 wt% MoS 2 @MXene/PVDF at room temperature and 10 3 Hz is 24.3, and the loss is only 0.02. Even though the filler content is increased to 12.51 wt%, the loss is only 0.06, and the dielectric constant of the composite film can reach 145.2. Compared with the blend of PVDF and MXene, the dielectric constant of MXene@MoS 2 /PVDF shows more excellent frequency stability and lower dielectric loss.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xian-ying Shi,Meng-hang Gao,Wen-wen Hu,Dan Luo,Shao-zhong Hu,Ting Huang,Nan Zhang,Yong Wang
Due to the high presence of active functional groups, two-dimensional transition metal carbide/nitride materials that are usually named MXene have been thought as an efficient adsorbent for the removal of organic contaminants from wastewater. However, the poor stability of MXene originated from the high oxidization performance greatly restricts their application. In this work, few-layered MXene was firstly prepared and then the in-situ polymerization of polypyrrole (PPy) was induced in the MXene solution to prepare the MXene/PPy composite particles. The microstructure, adsorption behaviors toward methylene blue (MB) and the stability during the storage process were systematically investigated. The results show that introducing PPy nanoparticles promotes the further exfoliation of MXene. Consequently, the adsorption ability of the MXene/PPy composite particles is significantly enhanced, and the maximum adsorption capacity reaches 553.57 mg/g. The MXene/PPy composite particles also show high adsorption selectivity and it can exclusively remove MB from the solution mixing both cationic and anionic dyes simultaneously. The stability of the MXene is greatly enhanced and nearly no oxidization is observed for the MXene/PPy composite particles. This study offers an additional way to fabricate the MXene-based adsorbents with high stability, and the composite particles exhibit promising applications in effluent water remediation.
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