SENSORS AND ACTUATORS A-PHYSICAL
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2022
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IF 4.291
Baohui Zhang,Zhiqiong Li,Chong Li,Min Li,Chen Fu,Ran Tao,Xian-hu Zha,Honglang Li,Jingting Luo
This paper demonstrates chemi-resistive type and QCM ammonia sensors based on Ti 3 C 2 T x MXene with surface engineering. The morphology and structure composition of Ti 3 C 2 T x MXene were completely tested by XRD, SEM, TEM and Raman. The ammonia sensing performance of Ti 3 C 2 T x MXene sensors at room temperature were systematically studied. The QCM sensors show better performance towards ammonia than chemi-resistor sensors. The Ti 3 C 2 T x -S QCM sensor possesses quite sensitivity (49 Hz@100 ppb), high response/recovery capability (33 s/58 s) and good selectivity . XPS was introduced for the surface element status for the potential ammonia adsorption mechanism. It can be mainly related to for lowest average potential for reaction of Ti-S and the additional absorption towards the product nitric oxides enhancing the frequency shift by absorption mass increasing. This work confirms that surface engineering of Ti 3 C 2 T x MXene to be effective method for enhancing gas sensing performance, and the sensor shows potential application for low concentration ammonia sensing.
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CARBON
·
2022
·
IF 11.307
Xiaoming Chen,Xin Wang,Kaiqiang Wen,Jiangbin Zhang,Fengwan Zhao,Jie Zhang,Yijie Wang,Qihang Song,Chenglin Yi,Jinyou Shao
High-performance electromagnetic microwave (EM) absorbers demand not only wide effective absorption bandwidth (EAB) and strong absorption capability, but also lightweight and small thickness. In this work, a new strategy was developed to simultaneously strengthen the lossy capacity and reduce the inclusion loading by designing the orientation of inclusions and constructing multilayered gradient structures. Accordingly, Ti 3 C 2 T x MXene fillers were aligned in the same chains by the electric field-assisted alignment technique, forming a parallel-plate structure, throughout epoxy matrix resulting in strong lossy capacity. The widest EAB of aligned 16 wt% MXene/epoxy composite reached 5.08 GHz with a thickness of 1.34 mm. By comparison, the random 16 wt% MXene/epoxy composite exhibited an EAB of only 0.96 GHz with a thickness of 1.96 mm. Further, the impedance matching was optimized by designing multilayered gradient structures based on aligned MXene/epoxy composites. The trilayered gradient structure with an equivalent filler content of 10.97 wt% illustrated the best EAB of 6.01 GHz at only 1.53 mm thickness. In addition, the synergistic effect of the multiple loss mechanisms was also discussed. Overall, the proposed method demonstrates the effectiveness of coupling the alignment of inclusions with gradient structural design to prepare lightweight, thin, and high-performance EM absorbing materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Jinghao Zhuang,Hui Pan,Wenlin Feng
Currently, the direct and easy–to–operate electrochemical sensing technology has promising application in food safety. Here, a novel electrochemical sensing platform based on two-dimensional (2D) sheet Ti 3 C 2 T X MXene and three-dimensional (3D) urchin–like Co(VO 3 ) 2 (H 2 O) 4 (CoVO) modified glassy carbon electrode (GCE) was designed for electrochemical detection toward nitrite. The urchin–like CoVO/Ti 3 C 2 T X was obtained by hydrothermal and electrostatic self-assembly. The electrochemical properties and nitrite reaction of CoVO/Ti 3 C 2 T X /GCE were tested and studied. Under the optimal conditions, the linear response ranges for nitrite detection are 0.5–50 μM and 50–2000 μM. Furthermore, the electrochemical sensor showed satisfied recoveries for the detection of nitrite in drink water and milk samples. The excellent response of this sensor to nitrite is attributed to unique electrochemical and catalytic properties of CoVO/Ti 3 C 2 T X , as verified by density functional theory (DFT) calculations.
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ELECTROCHIMICA ACTA
·
2023
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IF 6.6
Xianwei Geng,Chenguang Liu,Chun Zhao,Zhongjie Jiang,Eng Gee Lim,Yongjie Wang,Ivona Mitrovic,Li Yang,Pengfei Song
As a novel two-dimensional (2D) layered material, Ti 3 C 2 T x MXene has excellent electronic conductivity and strong polysulfides adsorption. Its potential for Li-S batteries has been well recoginised since it can compensate conductivity of sulfur and improve cycling stability simultaneously. However, like other 2D materials , the stacking feature of the MXene nanosheet greatly limits its advantages and applications. Herein, a sulfydryl-modified MXene - sulfur cathode is synthesized via simple hydrothermal and copolymerization reactions. Compared to the conventional physical absorption between MXene and polysulfide, it was found that a chemical modification of MXene offers a much robust structure with little stacking on MXene. During the discharge process high-order Li 2 S 4 intermediates were first formed but consumed immediately. The remaining polysulfides are only short chains of Li 2 S, Li 2 S 2 and Li 2 S 3 . This type of cathode can greatly suppress the “shuttle effect” by reducing the generation of soluble high-order polysulfides in the electrolyte, which is attributed to rapid capacity fading. As a result, the cathode achieves an excellent initial specific capacity of 1367 mAh·g −1 at 0.1 C. It also has a high first capacity of 880 mAh·g −1 and remains 715 mAh·g −1 after 500 cycles at 1 C, with a retention rate of 81.3%. Our work provides a new strategy for applying MXene in the Li-S battery field.
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Nature Communications
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2022
·Vol. 13
·期 1
·1-8
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IF 17.694
Wan Sijie,Li Xiang,Chen Ying,Liu Nana,Wang Shijun,Du Yi,Xu Zhiping,Deng Xuliang,Dou Shixue,Jiang Lei,Cheng Qunfeng
Titanium carbide MXene combines high mechanical and electrical properties and low infrared emissivity, making it of interest for flexible electromagnetic interference (EMI) shielding and thermal camouflage film materials. Conventional wisdom holds that large MXene is the preferable building block to assemble high-performance films. However, the voids in the films comprising large MXene degrade their properties. Although traditional crosslinking strategies can diminish the voids, the electron transport between MXene flakes is usually disrupted by the insulating polymer bonding agents, reducing the electrical conductivity. Here we demonstrate a sequential densification strategy to synergistically remove the voids between MXene flakes while strengthening the interlayer electron transport. Small MXene flakes were first intercalated to fill the voids between multilayer large flakes, followed by interfacial bridging of calcium ions and borate ions to eliminate the remaining voids, including those between monolayer flakes. The obtained MXene films are compact and exhibit high tensile strength (739 MPa), Young’s modulus (72.4 GPa), electrical conductivity (10,336 S cm −1 ), and EMI shielding capacity (71,801 dB cm 2 g −1 ), as well as excellent oxidation resistance and thermal camouflage performance. The presented strategy provides an avenue for the high-performance assembly of other two-dimensional flakes.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Yanan Li,Zhihai Liu,Shuming Li,Pei Nian,Nan Xu,Haiyu Luo,Yibin Wei
Two-dimensional (2D) materials have proved their superiorities as building blocks for constructing high-performance nanofiltration (NF) membranes. Herein, we propose a novel MXene-based NF membrane with high water permeability and stability by intercalating Ag nanoparticles (AgNPs) into the laminar structure of Ti 3 C 2 T x MXene with hyperbranched polyethyleneimine (HPEI) crosslinking. The pure Ti 3 C 2 T x MXene membrane, the AgNP-intercalated Ti 3 C 2 T x MXene (AgNP@Ti 3 C 2 T x MXene) membrane and the AgNP@Ti 3 C 2 T x MXene membrane with HPEI crosslinking (HPEI-AgNP@Ti 3 C 2 T x MXene) were comparatively investigated regarding their physicochemical properties and NF performance. The prepared HPEI-AgNP@Ti 3 C 2 T x MXene membrane exhibited competitive water permeabilities (24.64–30.73 L·m −2 ·h −1 ·bar −1 ) and nearly 100% rejections for Congo red, methyl orange, methyl blue and Rhodamine B solutions for long-term operation. Moreover, the HPEI-AgNP@Ti 3 C 2 T x MXene membrane also showed excellent NF performance for MgSO 4 , MgCl 2 , Na 2 SO 4 and NaCl solutions with the rejections of 84.15%, 77.01%, 74.67% and 56.58%, respectively. The NF separation mechanisms for the HPEI-AgNP@Ti 3 C 2 T x MXene membrane were elucidated based on its unique physicochemical structure. These findings may offer novel insights into tuning the laminar structures of MXene-based NF membranes for enhanced water purification .
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Qianqian Zhou,Peidong Hong,Xu Shi,Yulian Li,Ke Yao,Wanqi Zhang,Chengming Wang,Junyong He,Kaisheng Zhang,Lingtao Kong
In order to solve the problem of easy aggregation of copper oxides in environmental remediation, it is an effective method to confine copper oxides to suitable substrates. Herein, we design a novel Cu 2 O/Cu@MXene composite with a nanoconfinement structure, and it can effectively activate peroxymonosulfate (PMS) to produce . OH for degradation tetracycline (TC). Results indicated that the MXene with extraordinary multilayer structure and surface negativity could fix the Cu 2 O/Cu nanoparticles in the layer spaces and suppress the agglomeration of nanoparticles. The removal efficiency of TC reached 99.14 % within 30 min, and the pseudo-first-order reaction kinetic constant was 0.1505 min −1 , which was 3.2 times that of Cu 2 O/Cu alone. The outstanding catalytic performance attributed that the MXene based on Cu 2 O/Cu@MXene could promote the adsorption of TC and electron transmittal between Cu 2 O/Cu nanoparticles. Furthermore, the degradation efficiency of TC was still over 82 % after five cycles. In addition, based on the degradation intermediates provided by LC-MS, two specific degradation pathways were proposed. This study provides a new reference for suppressing the agglomeration of nanoparticles, and broadens the application of MXene materials in the field of environmental remediation.
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Journal of Materiomics
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2023
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IF 9.4
Zehang Zhou,Lingfei Wei,Ya Yi,Shiyi Feng,Zeying Zhan,Dong Tian,Canhui Lu
MXene nanosheets are considered advantageous for functional materials, but current delamination methods to prepare MXene nanosheets have many limitations including high cost, small production scale, low efficiency, and deteriorated structure integrity of obtained nanosheets. Here, we propose a simple, efficient, and scalable shear stress-induced delamination (SSID) strategy to boost the production of single-/few-layered Ti 3 C 2 T x MXene nanosheets. Molecular dynamics simulation indicates that the pan mill-type grinding discs create a strong hydrodynamic flow field, which exerts gigantic shear stress to substantially delaminate the multilayered MXene stacks into homogeneously dispersed MXene nanosheets. Furthermore, shear stress generated from vigorous water flow has limited fragmentation effect, ensuring large lateral size and good structure integrity to the obtained MXene nanosheets as evidenced by the morphological and structural characterizations. Compared to conventional delamination methods, this novel SSID strategy exhibits great advantages in terms of efficiency, scalability and the properties of resultant MXene nanosheets, which opens up great opportunity for the scalable production and commercialization of high-performance MXene-based materials.
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高影响因子
CARBON
·
2023
·
IF 10.9
Zheng Ma,Zhiming Deng,Xinfeng Zhou,Lulu Li,Chenyang Jiao,Huiling Ma,Zhong-Zhen Yu,Hao-Bin Zhang
Lightweight and multifunctional compressible aerogels with low reflectivity are highly demanded to protect electronic devices from increasingly serious electromagnetic interference and radiation. Although simply incorporating magnetic particles can reduce the strong electromagnetic (EM) reflection caused by the high conductivity of MXene , high density, inhomogeneous dispersion and weak interfacial interactions may impede the potential applications. Here, we report the fabrication of three-dimensional magnetic MXene/Fe 3 O 4 @acidified-MWCNT (aMWCNT) composite aerogel by a directional freezing and subsequent freeze-drying process, and the shielding effectiveness of composite aerogel can be tuned from 32.5 to 51.6 dB in the X- band. At the same time, since the Fe 3 O 4 nanoparticles are pre-decorated onto aMWCNTs, the heterogeneous interface polarization and magnetic loss are enhanced at low loadings. Therefore, the reflected power coefficient of the aerogel is as low as 0.31 with an ultra-light density of only 10 mg cm - 3 . Moreover, the good reversible compressibility , fatigue resistance , excellent heat insulation , and infrared stealth grant the aerogels great application prospects for anti-infrared detection and green shielding materials.
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Surfaces and Interfaces
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2023
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IF 6.2
Hongyuan Cui,Lin Yang,Xueqi Fu,Guodong Li,Shu Xing,Xiao-Feng Wang
The simultaneous detection of multiple diabetes markers is important for the diagnosis and typing of diabetes because of the complex causes of diabetes. Two-dimensional titanium carbide (MXene), an emerging material, has great potential for biomedical sensing, in addition to its electrical applications. In this study, a fluorescence resonance energy transfer (FRET) aptasensor with high sensitivity and specificity was constructed using monolayer Ti 3 C 2 MXene for the simultaneous detection of insulin and visceral adipose tissue-derived serotonin (vaspin). Fluorescein-labeled insulin binding aptamers (IBAs) and Cy7-labeled vaspin-binding aptamers (VBAs) were attached to Ti 3 C 2 , and their fluorescence was effectively quenched by FRET between the fluorescein and Ti 3 C 2 . Insulin and vaspin were preferentially bound to IBA and VBA for a higher affinity. This process led to the subsequent shedding of fluorescein from Ti 3 C 2 , resulting in fluorescence recovery. The high fluorescence quenching efficiency and broad wavelength absorption of Ti 3 C 2 MXene enabled the quenching of two different, wide spectrum fluorescence at two different wavelengths, thus enabling the simultaneous detection of both insulin and vaspin. The aptasensor was highly sensitive, with a low detection limit of 36 pM for insulin and 45 pM for vaspin. Importantly, this Ti 3 C 2 -based aptasensor can precisely detect insulin and vaspin in human serum and diagnose a specific type of diabetes and identify its cause to facilitate subsequent treatment. The above results indicate that the Ti 3 C 2 -based aptasensor has promising applications in the clinical diagnosis and typing of diabetes mellitus.
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Micromachines
·
2023
·Vol. 14
·期 8
·1563
·
IF 3.4
Kai Chen,Wenzhong Lai,Wangchuan Xiao,Lumin Li,Shijun Huang,Xiufeng Xiao
Flexible electronic devices and conductive materials can be used as wearable sensors to detect human motions. However, the existing hydrogels generally have problems of weak tensile capacity, insufficient durability, and being easy to freeze at low temperatures, which greatly affect their application in the field of wearable devices. In this paper, glycerol was partially replaced by water as the solvent, agar was thermally dissolved to initiate acrylamide polymerization, and MXene was used as a conductive filler and initiator promoter to form the double network MXene-PAM/Agar organic hydrogel. The presence of MXene makes the hydrogel produce more conductive paths and enforces the hydrogel’s higher conductivity (1.02 S·m−1). The mechanical properties of hydrogels were enhanced by the double network structure, and the hydrogel had high stretchability (1300%). In addition, the hydrogel-based wearable strain sensor exhibited good sensitivity over a wide strain range (GF = 2.99, 0–200% strain). The strain sensor based on MXene-PAM/Agar hydrogel was capable of real-time monitoring of human movement signals such as fingers, wrists, arms, etc. and could maintain good working conditions even in cold environments (−26 °C). Hence, we are of the opinion that delving into this hydrogel holds the potential to broaden the scope of utilizing conductive hydrogels as flexible and wearable strain sensors, especially in chilly environments.Keywords:organic hydrogel;MXene;dual network;wearable sensor;anti freezing
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Advanced Optical Materials
·
2023
·
IF 9
Sisi Liu,Meng Wang,Xiong Yu,Hao Li,Haifei Lu,Xiaoyan Wen,Ming-Yu Li,Jianbing Zhang
Infrared (IR) solar cells are potential optoelectronic devices for boosting the power conversion efficiency (PCE) of conventional photovoltaics (such as pervoskite and silicon solar cells) by broadening the utilization range of the sunlight spectrum to short-wavelength infrared region. PbSe colloidal quantum dots (QDs) are one of the optimal candidates for IR solar cells because of their tunable bandgap in the IR region and flexible solution processibility. At present, the best PbSe QD IR photovoltaics generally adopt ZnO as an electron transport layer (ETL). However, the intrinsic drawbacks and surface defects of ZnO can potentially deteriorate the PCE of devices. Herein, Ti 3 C 2 T x , a representative 2D transition carbide, is combined with sol-gel ZnO to develop a new hybrid ETL for fabricating high-performance IR solar cells. This combination effectively suppresses the defects within ZnO by forming new bondings and simultaneously enhances the crystalline of ZnO film. Meanwhile, the introduction of Ti 3 C 2 T x into ZnO film accelerates the transport and collection of photo-generated carriers by constructing a new electron transport pathway. Consequently, compared to the bare devices, the infrared PCE of PbSe QD solar cells increases by 19.5% to 1.04%. These results demonstrate that this hybrid ETL can offer a bright approach for developing high-performance optoelectronic devices.
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