CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Peng Wang,Baoluo He,Biwen Wang,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
Antifouling coatings have been widely utilized to prevent microbial attachment. However, these coatings can be damaged and lose their effectiveness, leading researchers to develop coatings that can self-heal. In this study, a novel metal–organic framework (MZ-8) based on mercaptobenzothiazole (MBT) was successfully synthesized by forming coordination bonds with 2-methylimidazole and zinc salt. The MZ-8 was then combined with Ti 3 C 2 T X nanosheets (MXene) to create an organic–inorganic nanocomposite (MZ-8/MXene), which was used as a filler for polyurethane (PU) resin. The resulting MZ-8/MXene/PU coating exhibited a remarkable ability to convert near-infrared laser (NIR) light into heat, enabling the PU resin to melt and flow, thereby efficiently repairing mechanical damage with over 92% effectiveness. Additionally, the MZ-8/MXene/PU coating reduced microbial adhesion through the photothermal effect and the release of zinc ions and MBT, achieving a reduction of more than 99% in surface-attached bacteria and 93% in microalgae. Moreover, the coating demonstrated good anti-corrosion properties by inhibiting the penetration of corrosive substances, thanks to the protective film formed by MBT and the shielding properties of layered MXene. This study presents a novel approach to develop coatings with both antifouling and self-healing capabilities, offering wide-ranging applications in fields such as marine antifouling and biomedical instruments.
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Small
·
2023
·Vol. 19
·期 52
·2302335
·
IF 13.3
Beibei Wang,Weiye Zhang,Chenhuan Lai,Yi Liu,Hongwu Guo,Daihui Zhang,Zhanhu Guo
Strong, conductive, and flexible materials with improving ion accessibility have attracted significant attention in electromagnetic interference (EMI) and foldable wearable electronics. However, it still remains a great challenge to realize high performance at the same time for both properties. Herein, a microscale structural design combined with nanostructures strategy to fabricate TOCNF(F)/Ti 3 C 2 T x (M)@AgNW(A) composite films via a facile vacuum filtration process followed by hot pressing (TOCNF = TEMPO-oxidized cellulose nanofibrils, NW = nanowires) is described. The comparison reveals that different microscale structures can significantly influence the properties of thin films, especially their electrochemical properties. Impressively, the ultrathin MA/F/MA film with enhanced layer in the middle exhibits an excellent tensile strength of 107.9 MPa, an outstanding electrical conductivity of 8.4 × 10 6 S m −1 , and a high SSE/t of 26 014.52 dB cm 2 g −1 . The assembled asymmetric MA/F/MA//TOCNF@CNT (carbon nanotubes) supercapacitor leads to a significantly high areal energy density of 49.08 µWh cm −2 at a power density of 777.26 µW cm −2 . This study proposes an effective strategy to circumvent the trade-off between EMI performance and electrochemical properties, providing an inspiration for the fabrication of multifunctional films for a wide variety of applications in aerospace, national defense, precision instruments, and next-generation electronics.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 5
·1-11
·
IF 20.1
Zheng Sinan,Wu Na,Liu Yue,Wu Qilei,Yang Yunfei,Li Bin,Hu Chenxi,Liu Jiurong,Zeng Zhihui
Developing novel nanomaterials for constructing multifunctional macrostructures in a facile, energy-efficient, sustainable, and scalable approach is urgently demanded yet remains highly challenging. Here, a type of freestanding, robust, highly flexible composite films composed of “trashed” MXene sediment (MS) are prepared in an ambient pressure casting approach. The typical green polymer of polyvinyl alcohol is employed to demonstrate the high potential of MS for constructing films with multifunctionalities, including electrically conductive, hydrophobic, photothermal, and electromagnetic interference (EMI) shielding performance. Upon the synergy of surface terminal functional groups, local defects, and numerous heterogeneous interfaces, the MS-based composites can have EMI shielding effectiveness (SE) of 76.2 dB in the X-band at the thickness of merely 590 µm and efficient SE value in the ultrabroadband frequency range of 8.2 to 40 GHz. Moreover, the EMI SE of the MS-based composites is widely controlled by adjusting the MS contents and film thickness. Combined with the sensitive and reliable photothermal performance, this work thus demonstrates a cost-effective, sustainable, and scalable strategy to prepare a type of multifunctional MS-based films with application potentials in thermal therapy, wearable electronics, electromagnetic compatible, and aerospace. Graphical Abstract The freestanding, yet robust and highly flexible composite films for EMI shields, which exhibits excellent mechanical strength and flexibility, good hydrophobicity, and water resistance.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-13
·
IF 16.419
Jin Xin,Yang Lin,Wang Xiao-Feng
Two-dimensional (2D) perovskites solar cells (PSCs) have attracted considerable attention owing to their excellent stability against humidity; however, some imperfectness of 2D perovskites, such as poor crystallinity, disordered orientation, and inferior charge transport still limit the power conversion efficiency (PCE) of 2D PSCs. In this work, 2D Ti 3 C 2 T x MXene nanosheets with high electrical conductivity and mobility were employed as a nanosized additive to prepare 2D Ruddlesden–Popper perovskite films. The PCE of solar cells was increased from 13.69 (without additive) to 15.71% after incorporating the Ti 3 C 2 T x nanosheets with an optimized concentration. This improved performance is attributed to the enhanced crystallinity, orientation, and passivated trap states in the 3D phase that result in accelerated charge transfer process in vertical direction. More importantly, the unencapsulated cells exhibited excellent stability under ambient conditions with 55 ± 5% relative humidity.
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CHEMOSPHERE
·
2021
·
IF 7.086
Xiaolan Hu,Changhong Chen,Dawei Zhang,Yingwen Xue
A facile method was used to prepare two-dimensional MXene for the treatment of heavy metal ions in wastewater. The adsorbent has good selectivity for the adsorption of Hg (Ⅱ) in mixed divalent cationic metal solutions due to a large number of oxygen-containing functional groups on the surface of the material. The adsorption of mercury was tested using mercuric chloride and mercury nitrate solutions. The Langmuir maximum adsorption capacity of the adsorbent at a pH of 5.0 and a temperature of 30 °C is 1057.3 mg/g (mercuric nitrate) and 773.29 mg/g (mercuric chloride), respectively. The adsorbent also maintains a high adsorption capacity at low pH (pH = 2.0). The removal rate of mercury-containing wastewater within 100 mg/L is nearly 100%. The chemical species of Hg-containing ions at different pH and temperatures was studied. It was found that the adsorbent could maintain a high adsorption capacity for different forms of Hg-containing ions.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiu-Xiang Yang,Wen-Bei Yu,Chao-Fan Li,Wen-Da Dong,Li-Qi Jiang,Na Zhou,Zhi-Peng Zhuang,Jing Liu,Zhi-Yi Hu,Heng Zhao,Yu Li,Lihua Chen,Jinguang Hu,Bao-Lian Su
Increasing the separation efficiency of photogenerated carriers and preventing the hydrogen back oxidation are two key challenges in photocatalytic hydrogen production. Herein, we report a promising PtO@Ti 3 C 2 /TiO 2 photocatalyst to overcome these two challenges by in-situ growing TiO 2 nanosheets on Ti 3 C 2 MXene (to improve charge separation) and depositing PtO nanodots (to diminish hydrogen back reaction) for enhanced photocatalytic hydrogen production. Within this design principle, the photogenerated electrons and holes in the PtO@Ti 3 C 2 /TiO 2 composites flow in opposite direction into PtO and Ti 3 C 2 respectively, resulting in effective separation of the photogenerated electrons and holes. Beyond, the higher oxidation state of PtO nanodots also largely suppresses the undesirable hydrogen back oxidation reaction. Thereby the PtO@Ti 3 C 2 /TiO 2 composite demonstrates remarkable hydrogen production efficiency. Our work here indicates that rational design of dual co-catalysts could not only promote the separation of photogenerated carriers for enhanced hydrogen production, but also inhibit the reverse reaction of hydrogen production.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Dong Wen,Xiang Wang,Lu Liu,Cong Hu,Cheng Sun,Yiran Wu,Yinlong Zhao,Jianxin Zhang,Xudong Liu,Guobing Ying
MXene is a generic name for a large family of two-dimensional transition metal carbides or nitrides, which show great promise in the field of transparent supercapacitors. However, the manufacturing of supercapacitor electrodes with a high charge storage capacity and desirable transmittance is a challenging task. Herein, a low-cost, large-scale, and rapid preparation of flexible and transparent MXene films via inkjet printing is reported. The MXene films realized the sheet resistance (Rs) of 1.66 ± 0.16 MΩ sq–1 to 1.47 ± 0.1 kΩ sq–1 at the transmissivity of 87–24% (λ = 550 nm), respectively, corresponding to the figure of merit (the ratio of electronic to optical conductivity, σDC/σOP) of ∼0.0012 to 0.13. Furthermore, the potential of inkjet-printed transparent MXene films in transparent supercapacitors was assessed by electrochemical characterization. The MXene film, with a transmittance of 24%, exhibited a superior areal capacitance of 887.5 μF cm–2 and retained 85% of the initial capacitance after 10,000 charge/discharge cycles at the scan rate of 10 mV s–1. Interestingly, the areal capacitance (192 μF cm–2) of an assembled symmetric MXene transparent supercapacitor, with a high transmittance of 73%, still surpasses the performance of previously reported graphene and single-walled carbon nanotube (SWCNT)-based transparent electrodes. The convenient manufacturing and superior electrochemical performance of inkjet-printed flexible and transparent MXene films widen the application horizon of this strategy for flexible energy storage devices.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuyang Zhou,Yichao Lin,Benjamin Tawiah,Jun Sun,Richard K.K. Yuen,Bin Fei
This study presents a novel and facile strategy for fabricating fire-resistant, ultraviolet (UV)-shielding, and tensile-enhanced polylactide (PLA) composites using two-dimensional (2D) MXene (Ti3C2) flakes chemically modified with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The thermal and burning performances of PLA composites were demonstrated by the limiting oxygen index, UL-94 test, and cone calorimetry. The UV-shielding and tensile performances were also examined. The results revealed that PLA/Ti3C2–DOPO (3 wt %) displayed a V-0 rating in the UL-94 test. The enhancement against fire hazard was reflected by the significant reduction in the peak heat release rate (33.7%), total heat release (47%), peak CO production (58.8%), and total smoke production (41.7%). The improved fire-safety performance of the composites is attributed to the interplay of catalytic, barrier, and condensed effects of the Ti3C2–DOPO nanosheets in the PLA matrix. PLA/Ti3C2–DOPO also showed an increase (∼9%) in tensile strength and an “Excellent” level (UPF 50+) in the UV-protection assessment. In all, this study introduces a novel chemical modification strategy for 2D MXene flakes to fabricate multifunctional PLA composites, which are promising candidates for next-generation sustainable and protective plastic products.
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CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 8
·2141-2146
·
IF 6
Chuqiao Hu,La Li,Guozhen Shen
Main observation and conclusion Ti 3 C 2 MXene serving as superior electrical conductors presents more specific performance such as transparency, conductivity than gold (Au), and even could form a heterostructure with active materials of the functional devices. Here, a Ti 3 C 2 MXene-Te microplate van der Waals heterostructure based transparent near-infrared photodetector (PD) is exploited. Compared with Au-Te PD, the on-off ratio of the Ti 3 C 2 -Te PD is improved by seven orders of magnitude and reaches 9.51 × 10 7 under 1064 nm laser illuminations. Benefiting from the utilization of flexible PET substrate and Ti 3 C 2 conductors in manufacturing PD devices, the Ti 3 C 2 -Te PD exhibits excellent flexibility with no noticeable response change after being bent for different states and times. Moreover, 63% transmittance of the fabricated PD devices over the 500—1000 nm wavelength range is obtained. All the above results demonstrate the tremendous potential in wearable optoelectronics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiao Li,Caiyue Wen,Liting Yang,Ruixuan Zhang,Yuesheng Li,Renchao Che
The unique 2D/2D heterostructures can fully combine their respective 2D properties and exhibit enhanced performance due to its synergistic effect. However, how to effectively introduce other foreign 2D materials on the 2D MXene substrate, as well as research on their detailed synergistic effects, is still in lack. Herein, 3D conductive interconnected network with massive 2D/2D heterostructures in MXene-MoS 2 composites are constructed by a facile hydrothermal reaction , and the microwave absorption mechanism accompanying the synergistic effect is detailed analyzed. Impressively, the unique off-axis electron holography is firstly used to visually characterize the distribution of charge density at the 2D interface, which constructs an effective relationship between the charge density distribution at the 2D/2D heterostructures and the strength of the microwave absorption performance. In addition, the confined space provided by each independent accordion-like multilayered MXene facilitates the heterogeneous coupling between the layers to increase its dielectric loss capability. Accordingly, the MXene-MoS 2 composite holds the excellent microwave absorption performance accompanied by the superior reflection loss (RL) (−46.72 dB) and the distinct effective absorption bandwidth (EAB) (4.32 GHz) at only 2 mm thickness. This work refers an archetype for studying the synergistic effect between 2D/2D heterostructures.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Wei Zhong,Feng Gao,Jin Zou,Shuwu Liu,Mingfang Li,Yansha Gao,Yongfang Yu,Xiaoqiang Wang,Limin Lu
In this paper, a novel ratiometric electrochemical sensor for carbendazim (CBZ) detection was constructed by a composite of MXene@Ag nanoclusters and amino-functionalized multi-walled carbon nanotubes (MXene@AgNCs/NH 2 -MWCNTs). The Ag nanoclusters (AgNCs) embedded in the MXene not only could inhibit the aggregation of MXene flakes and enhance the electrocatalytic ability, but also serve as an internal reference probe for the ratiometric electrochemical detection. Moreover, the introduction of NH 2 -MWCNTs can further improve the electrochemical signals of CBZ and Ag, resulting in the enhanced signal amplification and higher sensitivity. Based on these characteristics of the MXene@AgNCs/NH 2 -MWCNTs composite, the proposed sensor exhibits a favorable linear relationship between I CBZ /I AgNCs and the concentration of CBZ ranging from 0.3 nM to 10 μM and a low limit of detection of 0.1 nM. Moreover, the proposed ratiometric electrochemical sensing platform also demonstrates high selectivity, good reproducibility, secular stability, and satisfactory applicability in vegetable samples.
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Nano Energy
·
2021
·
IF 17.881
Lianjia Zhao,Lili Wang,Yiqiang Zheng,Shufang Zhao,Wei Wei,Dawei Zhang,Xiyao Fu,Kai Jiang,Guozhen Shen,Wei Han
The ability of electronic skins to identify physiological and physical signals accurately is the key to human-computer interaction. However, it is still a great challenge to improve stability of electronic-skin when maintaining the high-level pressure-response for applications in harsh conditions. Here, a highly-stable electronic skin is designed by synergistically incorporating strong hydrogen-bonds in MXene and polyvinyl alcohol (PVA). Molecular dynamics calculations show that the introduction of PVA can reduce the diffusion coefficient of MXene in acidic and basic solutions, increasing the adsorption (free) energies and providing hybrid film with good chemical stability. Therefore, the film provides stable performance recordings that last for over half a year in harsh environments. The film also shows good biocompatibility and function in an in-vivo study conducted on mice. To enhance functionality of soft robots and personal protective equipment used in harsh environments, it is important that the film has persistent and stable performance, all-weather usability, and good in vivo compatibility.
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