JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Tian Zhang,Limei Pan,Huan Tang,Fei Du,Yanhua Guo,Tai Qiu,Jian Yang
Herein, enhanced exfoliation and large-scale delamination of two-dimensional (2D) Ti 3 C 2 T x MXene using etchant of HCl + LiF, instead of HF, in which both etching and intercalation were achieved in exfoliation process, were thoroughly investigated with the focus on the effects of two critical factors, reaction temperature and washing solution. Increasing etching temperature promotes the exfoliation process, i.e., the transformation from Ti 3 AlC 2 to multilayer Ti 3 C 2 T x MXene, whereas simultaneously results in an aggravated surface oxidation of MXene layers formed after the extraction of Al. As a result, delamination ratio increases firstly and then decreases, and the samples etched at 35 °C show the highest delamination ratio. Compared with the distilled water, washing the exfoliation products using ethanol significantly improves the delamination ratio of Ti 3 C 2 T x MXene by co-intercalation of larger alcohol molecule and more impurity ions and a large scale delamination of Ti 3 C 2 T x MXene with a delamination ratio as high as 29.2% was obtained by simple sonication for 1 h, without additional intercalation step required, after washing using ethanol. The possible exfoliation reactions by HCl + LiF solution were proposed. Using the as-fabricated stable suspensions of delaminated Ti 3 C 2 T x flakes, flexible, free-standing Ti 3 C 2 T x papers with tailored thickness, hydrophilic surface and excellent conductivity, typically 2 × 10 5 S/m at 5 μm in thickness, were prepared. As anode for lithium ion batteries , the delaminated Ti 3 C 2 T x MXene obtained reversible capacities of 226.3 mAh g −1 , 137.9 mAh g −1 ,102.0 mAh g −1 and 47.9 mAh g −1 respectively at the current density of 100, 300, 1000 and 3000 mA g −1 , which are superior to those of the Ti 3 C 2 MXene prepared by conventional HF process.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Le Li,Yawen Zhang,Chengyi Si,Cong Cai,Hongyu Liu,Xiaoqiang Fan,Minhao Zhu
Two-dimensional materials, such as Ti 3 C 2 T x and graphene oxide (GO), are considered candidates for a new generation of lubricating materials due to their unique physical and chemical properties. However, the dispersion stability of Ti 3 C 2 T x and GO in non-polar oils is insufficient, hindering their potential as lubricating additives. Herein, 1,12-Dodecanediamine (DDM) was used as a bridge to connect Ti3C2Tx and GO, and to reduce graphene oxide (rGO) for forming the stacked two-dimensional multilayer Ti3C2Tx/rGO heterostructures . The multilayer Ti 3 C 2 T x /rGO heterostructure exhibits excellent dispersion stability in PAO 20, ensuring its continuous integration into the tribo-interfaces throughout the friction process. The addition of 0.06 wt% multilayer Ti 3 C 2 T x /rGO to the base oil reduced the average friction coefficient and wear volume by 35.3% and 41.6%. The enhanced lubrication performance is mainly due to the unique multilayer heterostructure of Ti 3 C 2 T x /rGO. During friction, the disintegration of Ti 3 C 2 T x into small fragments effectively safeguards the structural integrity of rGO, thereby facilitating the formation of a robust and smooth multilayer lubrication film. Additionally, Ti3C2Tx is adhered to the wear surface in smaller sizes or evolved into the form of Ti oxides. The emergence of this new composite material is not only expected to solve the problem of insufficient performance of traditional lubricating materials under extreme conditions, but also laid the foundation for expanding the application of two-dimensional materials in the field of lubrication.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Mianke Chen,Chenghong Zhang,Ruikai Liu,Kang Qiu,Youlin Gao,Yikang Qiang,Yiqing Yang,Wuyi Chai,Mahmoud A. Khalifa,Jialiang Luo,Wei Ding,Ganhong Zheng,Zhigao Sheng
Multi-layer 2D material assemblies introduce numerous interfaces that would improve microwave absorbing. Here, a 3D porous rGO/Ti 3 C 2 T x /TiO 2 heterostructure was prepared using a one-step hydrothermal synthesis. Due to the presence of the 2D/2D van der Waals heterojunction in rGO/Ti 3 C 2 T x featuring face-to-face contacts, and the 2D/0D heterojunctions in Ti 3 C 2 T x /TiO 2 , the interfacial polarization is optimized. The minimum reflection loss (RL min ) achieves −37.31 dB, and the effective absorption bandwidth (EAB) extends to 6.45 GHz (with<−10 dB). These results not only shed light on understanding and enhancement of interfacial effects, but also provides an appealing mode for the implementation of heterogeneous interfacial engineering using tailored 2D hierarchical structures.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 24
·2200991
·
IF 6.389
Xuesong Li,Ni Xue,Qian Yao,Liuyuan Han,Xiangyan Zhao,Bo Li,Tao He,Xutang Tao
As the quintessential representation of MXenes, Ti 3 C 2 T x has attracted widespread scientific interest and has demonstrated unparalleled potential in various applications. However, Ti 3 C 2 T x has always been subject to its ambient instability, which deteriorates the intrinsic properties and limits the practical applications. The mechanism responsible for oxidative degradation of Ti 3 C 2 T x has remained elusive, and the subsequent improvement of the preparation for ambient-stable Ti 3 C 2 T x is still a challenge. In this paper, the ambient instability of Ti 3 C 2 T x is found to be attributed to the presence of many oxidation active sites on the surface, the formation of which is highly correlated with the enrichment of etching by-products (AlF x or Al(OF) x ). Based on the above findings a slow-speed etching method is designed, using tetramethylammonium hydroxide as a separate etching-agent, to avoid adsorption of fluorine-containing by-products during etching. The prepared high-quality Ti 3 C 2 T x flakes exhibit excellent ambient stability even after 4 months of dispersion in water, unlike conventional aqueous Ti 3 C 2 T x dispersions that can only be kept for a few days. The intrinsic stability allows Ti 3 C 2 T x to avoid its decomposition in seawater desalination, and it exhibits superior desalination ability with a maximum reduction of 62.2% in Na + permeability and a maximum increase of 300% in water flux.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2023
·
IF 2.9
Feng Qing,Yang Jing,Dou Mingyuan,Zou Shuai,Wei Lixia,Huang Fuchuan
To achieve the goal of developing high-performance lubricant additives for industrial lubrication. Herein, tetradecylphosphonic acid (TDPA) modified Ti 3 C 2 T X and graphene oxide (GO) were used as nanohybrid lubricant additives in the polyalphaolefins base oil (PAO6). The high-speed reciprocating friction and wear test shows that TDPA–Ti 3 C 2 /GO is an efficient friction-reduction and antiwear additive. The base oil mixed with 0.05 wt%TDPA–Ti 3 C 2 /0.05 wt% GO exhibits the lowest coefficient of friction (COF) and wear rate with the value of 0.09 and 4.4 × 10 –6 mm 3 /Nm, decreased by 54.5 and 90.0% compared with pure PAO6 oil, respectively. Detailed characterization analysis shows that the tribological film of the modified TDPA–Ti 3 C 2 /GO nanohybrids oil-lubricated surface was mainly composed of PAO6, TDPA, GO, and iron oxide. This indicates that the friction-reduction and antiwear mechanism of TDPA–Ti 3 C 2 /GO in base oil lies in the adsorption of the two nanomaterials and the formation of a self-lubricating film on the rubbing interface. This study provides a new approach to the design of nanohybrid lubricant additives and creates new prospects for the application of nanomaterials in tribology.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chengbin Liu,Sibei Hao,Xiaoyan Chen,Boyang Zong,Shun Mao
MXenes, a group of emerging two-dimensional (2D) transition metal carbides or nitrides, have attracted wide interest due to their unique structures and properties. Their stability and applicability in different media especially in an alkaline environment are directly associated with their potential applications and are not yet explored. Herein, a field-effect transistor (FET) is fabricated with single/double-layer Ti3C2Tx MXene. The Ti3C2Tx FET indicator shows a fast (∼1 s), sensitive, and selective response to alkali. Moreover, the device can work even in a high-salinity (2 M NaCl) environment, suggesting its high anti-interference ability for alkali in a high-ionic-strength environment. Using an in situ morphological image evolution study, it is demonstrated that the response signal results from alkali-induced denaturation of Ti3C2Tx nanosheets. The Ti3C2Tx-based alkali FET indicator and systematic evaluation on alkali-induced structure evolution of Ti3C2Tx provide essential insights into MXene-based FETs and future applications of MXene in alkaline environments.
研究领域:
材料科学
·
电子器件
·
化学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Zhaorui Zhang,Jinkui Chu,Huashuai Hu,Haoming Sun,Xuefei Zhao,Haiying Du,Minghui Yang
Nitrogen dioxide (NO2) is a significant environmental and human health hazard. Current NO2 sensors often lack sensitivity and selectivity under ambient conditions. This study investigates ammonia pyrolysis modification of monolayer Ti3C2Tx MXene to enhance NO2 detection at room temperature. Nitrogen-doped Ti3C2Tx demonstrates a substantial improvement in sensitivity, with a response of 8.87% to 50 ppm of NO2 compared to 0.65% for the original sensor, representing a 13.8-fold increase. The nitrogen-doped sensor also exhibits superior selectivity and linearity for NO2 under ambient conditions. Theoretical analysis shows that nitrogen incorporation promotes enhanced interaction between Ti3C2Tx and its surface oxygen-containing functional groups through electronic hybridization, resulting in improved adsorption energy (1.80 |eV|) and electron transfer efficiency (0.67 |e|) for NO2, thereby enhancing its gas-sensing performance. This study highlights the potential of ammonia pyrolysis-treated Ti3C2Tx MXene for advancing NO2 sensor technologies with heightened performance at room temperature.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kunpeng Qian,Qianfan Zhou,Sineenat Thaiboonrod,Jianhui Fang,Miao Miao,Hongmin Wu,Shaomei Cao,Xin Feng
With the development of electronic equipment, heat problem and electromagnetic pollution severely affect both their functions and human health, which leads to great interests in developing materials synchronously with outstanding thermal conductivity and electromagnetic interference (EMI) shielding performance. Here, ultrathin Ti 3 C 2 T x /h-BN two-dimensional (2D) heterostructure films were prepared via coulombic assembly between Ti 3 C 2 T x MXene and h-BN nanosheet through ultrasonic blending. After the addition of h-BN nanosheet as thermal conductive nanofillers, the hybrid films achieved a higher value of thermal conductivity, compared to Ti 3 C 2 T x composite film without h-BN. The higher thermal conductivity offered by h-BN enables the Ti 3 C 2 T x /h-BN films have good potential for EMI shielding applications on wearable and portable electronic devices. When the mass ratio of Ti 3 C 2 T x /h-BN is 7:3, the hybrid film with the thickness of 47.60 µm exhibited electrical conductivity of 57.67 S/cm and the maximum EMI shielding effectiveness of 37.29 dB.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Haiyu Luo,Nan Xu,Yanan Li,Junzhi Li,Wenlan Ji,Pei Nian,Zheng Wang,Yibin Wei
MXene nanosheets have been identified as promising building blocks for high-performance nanofiltration (NF) membranes in water purification . Herein, we report a series of amino acid-bonded Ti 3 C 2 T x MXene membranes with enhanced NF performance and antifouling properties via glycine (Gly), l -glutamic acid (L-Glu), l -lysine (L-Lys) or l -cysteine (L-Cys) modification. The physicochemical properties, separation performances and anti-fouling behaviors of the pure Ti 3 C 2 T x MXene membrane, Gly-, L-Glu-, L-Lys- and L-Cys-bonded Ti 3 C 2 T x MXene membranes were comparatively investigated. The stable Ti–N bonds were found between the amino acids and the MXene nanosheets and different amino acids lead to different properties of the corresponding membranes. While maintaining ultra-high rejections to various organic dyes, all the amino acid functionalized membranes exhibited enhanced water permeability (7.17–13.11 L·m −2 ·h −1 ·bar −1 ) compared with that of the pure MXene membrane. Importantly, the Gly-bonded membrane showed the optimal separation performance with high salt rejections of 86.28%, 81.36%, 72.88% and 66.82% to MgSO 4 , MgCl 2 , Na 2 SO 4 and NaCl, respectively, and the membrane also exhibited superior anti-fouling property with a flux recovery rate of 80.59% to bovine serum albumin (BSA). The separation mechanism was further revealed which may offer a simple yet efficient way for enhancing 2D MXene-based NF membranes.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Huying Yan,Yang Guo,Xingzhi Bai,Jiawei Qi,Xiangyu Zhao,Haipeng Lu,Longjiang Deng
Developing a lightweight microwave absorbing materials (MAMs) with high absorption capacity at low thickness is a perennial challenge in materials engineering. Herein, a light Ti 3 C 2 T x @Carbon/NiZn ferrite (Ti 3 C 2 T x @C/NZFO) composite is designed by synergistically incorporating dielectric–magnetic components. The inclusion of C and NZFO enhances the interfacial polarization of the substrate and optimizes its impedance matching. Additionally, the presence of NZFO also produces magnetic loss mechanisms, such as natural and exchange resonance, as well as eddy current loss. Spontaneously, Ti 3 C 2 T x @C/NZFO composite achieved a minimum reflection loss ( RL ) of –44.7 dB at 12.5 GHz and displayed an effective absorption bandwidth of 4.27 GHz (13.53–17.8 GHz) at a thin thickness of 1.3 mm ( RL < –10 dB). Besides, the Ti 3 C 2 T x @C/NZFO composite exhibits the smallest radar cross–section (RCS) value, which further corroborates its outstanding microwave absorption performance. This research offers a groundbreaking approach to designing lightweight and thin MAMs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jingxuan Cui,Jiao Wu,Le Mi,Aihu Feng,Yang Yu,Yun Yu
Ti3C2Tx MXene is expected to achieve infrared stealth by regulating its thermal radiation properties. In this study, Ti3C2Tx MXene films were prepared by using the acid etching method, and the effects of etchants (HCl/LiF, HF, and NH4HF2) on the film structure as well as the infrared radiation properties were systematically studied. The intercalation process used to exfoliate single/few-layer nanosheets was found to accelerate the oxidation and increase the resistance of MXene. The mechanism behind these effects on emissivity was explained in detail. Based on these findings, the most suitable preparation process for low-emissivity MXene was selected. The resulting Ti3C2Tx film (HL-f), which used HCl/LiF as an etchant for Ti3AlC2, has a high conductivity of 3119 S/cm that reflects numerous infrared waves reaching its surface while exhibiting a low emissivity of only 0.13. The colloidal solution (HL-s) made with HCl/LiF as an etchant was sprayed directly onto a PI substrate as a coating with infrared stealth capabilities, thermal stability, and Joule heating properties, reducing the emissivity from 0.87 to 0.14. This work provides guidance for improving MXene preparation methods and their applications in related fields while demonstrating the great potential of HCl/LiF-etched Ti3C2Tx MXene as a low-emissivity infrared stealth material.
研究领域:
材料科学
·
红外技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Huiqin Li
Soft electro-ionic actuators have received extensive research and attention due to their advantages such as low voltage response and adjustable deformation. However, they have not been able to enter the actual industry application like traditional rigid actuators; one of the reasons may be that the kinematic properties of actuators have been less studied. The electro-ionic actuator based on Ti3C2Tx MXene-CNT/PPy electrode prepared in this paper shows good bending displacement (18.8 mm) and strain (0.63%) under 4 V voltage. In this article, the overlapping nature and exponential function relationship of the actuator end-point trajectories are preliminarily discussed, and the morphology change and cubic polynomial function relationship of the actuator body are considered. Moreover, in application, a novel proof-of-concept model of smart wearable finger straps is proposed. This study is a unique attempt and is hoped to provide a new research perspective in the field of soft electro-ionic actuators.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）