ACS Nano
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2018
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IF 13.709
Sai Zhao,Hao-Bin Zhang,Jia-Qi Luo,Qi-Wei Wang,Bin Xu,Song Hong,Zhong-Zhen Yu
Two-dimensional transition-metal carbides/carbonitrides (MXenes) with both superb electrical conductivity and hydrophilicity are promising for fabricating multifunctional nanomaterials and nanocomposites. However, the construction of three-dimensional (3D) and lightweight MXene macroscopic assemblies with excellent electrical conductivity and mechanical performances has not been realized due to the weak gelation capability of MXene sheets. Herein, we demonstrate an efficient approach for constructing highly conductive 3D Ti3C2Tx porous architectures by graphene oxide assisted hydrothermal assembly followed by directional freezing and freeze-drying. The resultant hybrid aerogels exhibit aligned cellular microstructure, in which the graphene sheets serve as the inner skeleton, while the compactly attached Ti3C2Tx sheets present as shells of the cell walls. The porous and highly conductive architecture (up to 1085 S m–1) is highly efficient in endowing epoxy nanocomposite with a high electrical conductivity of 695.9 S m–1 and an outstanding electromagnetic interference (EMI)-shielding effectiveness of more than 50 dB in the X-band at a low Ti3C2Tx content of 0.74 vol %, which are the best results for polymer nanocomposites with similar loadings of MXene so far. The successful assembly methodology of 3D and porous architectures of Ti3C2Tx would greatly widen the practical applications of MXenes in the fields of EMI shielding, supercapacitors, and sensors.
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JACS Au
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2024
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IF 8.5
Yusi Peng,Lili Yang,Yanyan Li,Weida Zhang,Meimei Xu,Chenglong Lin,Jianjun Liu,Zhengren Huang,Yong Yang
Motivated by the desire for more sensitivity and stable surface-enhanced Raman scattering (SERS) substrates to trace detect chloramphenicol due to its high toxicity and ubiquity, MXene has attracted increasing attention and is encountering the high-priority task of further observably improving detection sensitivity. Herein, a universal SERS optimization strategy that incorporates NH4VO3 to induce few-layer MXenes assembling into multiporous nanosheet stacking structures was innovatively proposed. The synthesized Nb2C-based multiporous nanosheet stacking structure can achieve a low limit of detection of 10–10 M and a high enhancement factor of 2.6 × 109 for MeB molecules, whose detection sensitivity is improved by 3 orders of magnitude relative to few-layer Nb2C MXenes. Such remarkably enhanced SERS sensitivity mainly originates from the multiple synergistic contributions of the developed physical adsorption, the chemical enhancement, and the conspicuously improved electromagnetic enhancement arising from the intersecting MXenes. Furthermore, the improved SERS sensitivity endows Nb2C-based multiporous structures with the capability to achieve ultrasensitive detection of chloramphenicol with a wide linear range from 100 μg/mL to 1 ng/mL. We believe it is of great significance in conspicuously developing the SERS sensitivity of other MXenes with surficial negative charges and has a great promising perspective for the trace detection of other antibiotics in microsystems.
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RARE METALS
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2024
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IF 9.6
Wang Wei-Wei,Huang Rui,Tao Yu,He Peng,Tuo Su-Xing,Bian Yu-Jian,Hu Rui-Ting,Yan Jun,Liang Yan-Jie,Zhang Wen-Chao
The electrochemical utilization of Zn anodes in aqueous batteries is hampered by the intricate and interconnected issues of Zn dendrite growth, H 2 evolution and Zn corrosion reactions. In this study, a multifunctional protective layer comprising MXene and graphitic carbon nitride (g-C 3 N 4 ) was constructed using a self-assembly strategy. The MXene/g-C 3 N 4 protective layer exhibited robust zincophilic characteristics, which facilitated a uniform distribution of the electric field and ensured a sufficient influx of Zn 2+ . This reduces the Zn 2+ nucleation barrier and prevents dendrite growth. In addition, the hydrophobic nature of the protective layer, coupled with its negative charge, can repel SO 4 2− and select water molecules from the electrolyte, which aids in mitigating corrosion and H 2 evolution. The symmetric Zn cell coated with the MXene/g-C 3 N 4 protective layer showed remarkable stability, achieving over 2000 h of reversible cycling at 1 mA·cm −2 . Furthermore, the MXene/g-C 3 N 4 -coated Zn anode paired with a sodium-doped V 2 O 5 cathode (NVO) exhibited enhanced cycling capability over 1500 cycles. Graphical Abstract
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Shaohui Peng,Chenxu Liu,Junhui Tan,Pengxiang Zhang,Junjie Zou,Yunfan Wang,Yanan Ma,Xin Zhang,Ce-Wen Nan,Bao-Wen Li
MXene inks offer a promising avenue for the scalable production and customization of printing electronics. However, simultaneously achieving a low solid content and printability of MXene inks, as well as mechanical flexibility and environmental stability of printed objects, remains a challenge. In this study, we overcame these challenges by employing high-viscosity aramid nanofibers (ANFs) to optimize the rheology of low-concentration MXene inks. The abundant entangled networks and hydrogen bonds formed between MXene and ANF significantly increase the viscosity and yield stress up to 103 Pa·s and 200 Pa, respectively. This optimization allows the use of MXene/ANF (MA) inks at low concentrations in direct ink writing and other high-viscosity processing techniques. The printable MXene/ANF inks with a high conductivity of 883.5 S/cm were used to print shields with customized structures, achieving a tunable electromagnetic interference shielding effectiveness (EMI SE) in the 0.2–48.2 dB range. Furthermore, the MA inks exhibited adjustable infrared (IR) emissivity by changing the ANF ratio combined with printing design, demonstrating the application for infrared anticounterfeiting. Notably, the printed MXene/ANF objects possess outstanding mechanical flexibility and environmental stability, which are attributed to the reinforcement and protection of ANF. Therefore, these findings have significant practical implications as versatile MXene/ANF inks can be used for customizable, scalable, and cost-effective production of flexible printed electronics.
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FOOD CHEMISTRY
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2024
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IF 8.5
Mingyue Ye,Xianfeng Lin,Jin Li,Xiaowan Chen,Dichen Ying,Shijia Wu,Zhouping Wang,Nuo Duan
Malachite green (MG) has been illicitly employed in aquaculture as a parasiticide, however, its teratogenic and carcinogenic effects pose a significant human health threat. Herein, a dual-mode colorimetric and electrochemical aptasensor was fabricated for MG detection, capitalizing on the robust catalytic and peroxidase-like activity of P-CeO 2 NR@Mxene and good capture efficiency of a tetrahedral DNA nanostructure (TDN) designed with multiple aptamers (m-TDN). P-CeO 2 NR@Mxene-modified complementary DNA (cDNA) served as both colorimetric and electrochemical probe. m-TDN was attached to AuE to capture MG and P-CeO 2 NR@Mxene/cDNA. The superior aptamer and MG binding to cDNA regulated signals and enabled precise MG quantification. The further introduced Exo I enabled aptamer hydrolysis, releasing MG for further binding rounds, allowing target recycling amplification. Under the optimal conditions, the aptasensor reached an impressively low detection limit 95.4 pM in colorimetric mode and 83.6 fM in electrochemical mode. We believe this dual-mode approach holds promise for veterinary drug residue detection.
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Tungsten
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2024
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IF 5.6
Chen Hao,Wang Ya-Qin,Zhang Dong-Ting,Zhao Bei,Li Min-Peng,Li Chen-Yang,Xu Tian-Peng,Liu Mao-Cheng
MXenes obtained significant attention in the field of energy storage devices due to their characteristic layered structure, modifiable surface functional groups, large electrochemically active surface, and regulable interlayer spacing. Nonetheless, the self-restacking and sluggish ions diffusion kinetics performance of MXenes during the alkali metal ions insertion/extraction process severely impedes their cycle stability and rate capability. This paper proposes an aniline molecule welding strategy for welding p-phenylenediamine (PPDA) into the interlayers of Ti 2 C through a dehydration condensation reaction. The welded PPDA molecules can contribute pillar effect to the layered structure of Ti 2 C. The pillar effect effectively maintains the structural stability during the sodium ions insertion/extraction process and effectively expands the interlayer spacing of Ti 2 C from 1.16 to 1.38 nm, thereby enhancing ions diffusion kinetics performance and improving the long-term cycle stability. The Ti 2 C-PPDA demonstrates outstanding Na + storage capability, exhibiting a specific capacity of 100.2 mAh·g −1 at a current density of 0.1 A·g −1 over 960 cycles and delivering a remarkable rate capability 81.2 mAh·g −1 at a current density of 5 A·g −1 . The study demonstrates that expanding interlayer spacing is a promising strategy to enhance the Na + storage capacity and improve long-term cycling stability, which provides significant guidance for the design of two-dimensional Na + storage materials with high-rate capability and cycle stability.
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Journal of Food Measurement and Characterization
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2024
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IF 2.9
Liao Diyan,Zhao Yong,Zhou Yi,Yi Yinhui,Weng Wenchuan,Zhu Gangbing
The extensive usage of organophosphate pesticides (OPs) has posed severe harm to human health and environmental system, but achieving highly effective and on-site detection is still a great challenge. In this work, a novel nanozyme Nb 2 CT x MXene/bimetallic PdPt (Nb 2 CT x @PdPt) was synthesized firstly through a simple self-reduction method, and the results show that the as-prepared Nb 2 CT x @PdPt nanozyme exhibits outstanding peroxidase-like activity. Interestingly, the nanozyme activity of Nb 2 CT x @PdPt is restrained remarkably in the presence of acetylcholine chloride and acetylcholinesterase while it can be restored through the addition of OPs (selecting glyphosate as a model). Based on this phenomenon, a sensitive colorimetric assay coupled with hydrogel and smartphone for OPs was then constructed. After optimizing various conditions, the designed sensing platform can achieve stable, rapid, and sensitive on-site detection for OPs, showing superior sensing performances: a wide linearity of 1.0 ng mL −1 –1.0 µg mL −1 and low detection limit of 0.419 ng mL −1 .
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ACS Applied Nano Materials
·
2024
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IF 5.3
Xiaojing Su,Weihua Yang,Zhenhao Zhang,Lexi Deng,Kunquan Li,Huali Xie,Yunhui Wu,Xiaofan Zhang,Wenjian Wu
Wearable piezoresistive sensors have aroused considerable attention for their huge potential in emerging applications such as healthcare monitoring and intelligent electronics. However, the fabrication of piezoresistive sensors that combine excellent sensing performance with outstanding working reliability in watery environments still remains challenging. Herein, a superhydrophobic polyurethane (PU) sponge was proposed as a piezoresistive sensor through the synthesis of d-asparagine-modified MXene nanosheets (MXene-NH2) and coating of a conductive cross-linkable layer constructed by dihydroxyl-terminated poly(dimethylsiloxane) (PDMS(OH)) and MXene-NH2 nanosheets. The microscale sponge skeleton and nanoscale PDMS-MXene nanosheet wrinkles formed a hierarchically rough structure in support of superhydrophobicity with a water contact angle of 160°. Benefiting from the chemically cross-linkable network and strong adhesion of PDMS-MXene nanosheet coating, the obtained PDMS-MXene@PU sponge exhibited a robust water repellency with water contact angles (WCAs) larger than 150° after enduring chemical and physical damages. Owing to the synergistic effect of the production of microcrack junctions in the PDMS-MXene nanosheet layer and contact separation between conductive backbones, the PDMS-MXene@PU sensor was successfully applied in monitoring full-scale human motions (e.g., blowing, facial expression, finger and knee bending, etc.) with excellent sensing performances of the gauge factor reaching −1.9. The findings conceivably stand out as a methodology to fabricate robust superhydrophobic piezoresistive sensors with desirable sensing property for innovative and broad applications even under special working conditions.
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ELECTROCHIMICA ACTA
·
2025
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IF 5.6
Yuelin Lu,Jie Bai,Binbin Sun,Nannan Li,Zhenhuai Yang,Hailing Yu,Cong Wang,Cong Gu,Huan Liu,Peng Tang,Qiang Wang
MXene materials exhibit substantial energy storage capabilities owing to their high specific surface areas, tunable interlayer spacings, and excellent electrical conductivities. However, these layers are prone to re-stacking, negatively affecting the energy storage capacity of the material. Herein, through a process involving liquid nitrogen-assisted freeze-drying and subsequent annealing, Ti 3 C 2 T x nanosheets were combined with polyvinyl alcohol (PVA) polymer chains via hydrogen bonding to produce MXene and PVA-derived carbon composite aerogels (MPAs) with microstructures ranging from ordered to disordered arrangements. The incorporation of PVA inhibited nanosheet stacking, and PVA carbonization enhanced the electrical conductivity of the aerogel. The carbonized aerogel (MPA2.0) exhibited a larger specific capacitance along with a more disordered and denser microstructure, thereby accounting for the increased capacitance due to enhanced ion storage in the more structurally disordered carbon nanopores. The optimized MPA aerogel demonstrated a high power density, along with an excellent specific capacitance (MPA2.0 = 348.14 F g −1 , 2 mV s −1 scan rate), and a cycling stability of 92.52 % after 10,000 charge/discharge cycles. Furthermore, the MPA2.0-based supercapacitor obtained an impressive energy density (37.8 Wh kg −1 ) and an exceptionally high power density (1800 W kg −1 ) at a current density of 1 A g −1 . By adjusting the PVA loading, the shrinkage and stress–strain characteristics of the microstructure during freeze-drying and carbonization were altered, and the microstructural orientation of the resulting aerogels was controlled. The increased disorder in the aerogel enhanced its capacitor energy storage ability, providing a new approach for the design of multi-component high-performance hybrid supercapacitor electrodes.
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Advanced Science
·
2024
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IF 14.3
Fuping Bian,Rui Huang,Xiaobin Li,Jiwen Hu,Shudong Lin
Composite polymer materials featured superior thermal conductivity, flame retardancy, and electromagnetic shielding performance are increasingly in demand due to the rapid development of highly miniaturized, portable, and flexible electronic devices. Herein, a facile and green ball milling shear method is utilized for generating MXene@Boron nitride (MXene@BN). The multi-functional fillers (MXene@BN) are constructed and incorporated into polydimethylsiloxane (PDMS) to prepare a multifunctional composite (PDMS/MXene@BN) for achieving improved electromagnetic interference (EMI) shielding performance and thermal conductivity as well as flame retardancy simultaneously. When the PDMS/MXene@BN composite has a MXene@BN loading of 2.4 wt.%, it exhibits a high thermal conductivity of 0.59 W m −1 K −1 , which is 210% higher than that of the pure PDMS matrix. This is attributed to its unique chestnut-like double-layer structure. With a smoke production rate (SPR) of 0.04 m 2 s −1 and total smoke production (TSP) of 3.51 m 2 , PDMS/MXene@BN 2.4 composite exhibits superb smoke suppression properties. These SPR and TSP values are 63.20% and 63.50% lower than the corresponding values of pure PDMS. Moreover, the EMI SE of the PDMS/MXene@BN 2.4 can reach 26.3 dB at 8.5 GHz. The work reported herein provides valuable insight into developing composites with multiple functions, which show strong potential for application in advanced packaging materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Boxin Zhao,Xinxin Li,Changshun Gu,Yanli Wang,Hengchao Liu,Xiujie Guo,Yan Zhang,Hua Tian,Wenjing Qin,Shougen Yin
Fiber flexible strain sensors have the characteristics of small volume, light weight, good flexibility, easy deformation/recovery, and easy weaving. They can conform to various complex surfaces and endure various deformations, such as twisting and bending. Furthermore, the simple preparation process of fiber sensors lowers the production cost significantly. These features make them promising candidates for applications in motion monitoring, human-machine interface, and flexible intelligent products. However, the low sensitivity and narrow sensing range of existing sensors are still major challenges for their further development. To address these challenges, this paper proposes a MXene/MXene:MWCNTs@TPU fiber sensor, which adopts a two-step pre-stretching strategy to modify the porous TPU fiber surface with MXene and MWCNTs. The graded porous TPU fibers obtained by wet spinning can achieve 805 % stretching, providing a reliable substrate support for the fiber sensor, the combination of multi-dimensional conductive materials and the introduction of cracks and wrinkles enhance the sensitivity 277 and sensing range 510 % of the fiber sensor. The fiber sensor can detect various human motions and gestures by directly attaching to the skin or weaving into textiles, and can also be applied to information encryption transmission, demonstrating its huge potential in human health monitoring, intelligent flexible electronic products and encrypted communication.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yu Wan,Libing Zhang,Ting Wu,Chengli Tang,Haijun Song,Qianqian Cao
Conductive hydrogels with high performance and frost resistance are essential for flexible electronics, electronic skin, and soft robots. Nonetheless, the preparation of hydrogel-based flexible strain sensors with rapid response, wide strain detection range, and high sensitivity remains a considerable challenge. Furthermore, the inevitable freezing and evaporation of water in sub-zero temperatures and dry environments lead to the loss of flexibility and conductivity in hydrogels, which seriously limits their practical application. In this work, ionic liquids (ILs) and MXene are introduced into gelatin/polyacrylamide (PAM) precursor solution, and a PAM/gelatin/ILs/MXene/glycerol (PGIMG) hydrogel-based flexible strain sensor with MXene co-ILs ion–electron composite conductive network is prepared by combining the electrohydrodynamic (EHD) printing method and in-situ photopolymerization. The introduction of ILs provides an ionic conductive channel for the hydrogel. The introduction of MXene nanosheets forms an interpenetrating network with gelatin and PAM, which not only provides a conductive channel, but also improves the mechanical and sensing properties of the hydrogel-based flexible strain sensor. The prepared PGIMG hydrogel with the MXene co-ILs ion–electron composite conductive network demonstrates a tensile strength of 0.21 MPa at 602.82 % strain, the conductivity of 1.636 × 10 −3 S/cm, high sensitivity (Gauge Factor, GF = 4.17), a wide strain detection range (1–600 %), and the response/recovery times (73 ms and 74 ms). In addition, glycerol endows the hydrogel with excellent freezing (−60 °C) and water retention properties. The application of the hydrogel-based flexible strain sensor in the field of human motion detection and information transmission shows the great potential of wearable devices, electronic skin, and information encryption transmission.
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