SENSORS
·
2021
·Vol. 21
·期 9
·3069
·
IF 3.576
Qiannan You,Zhongyang Guo,Rui Zhang,Zhimin Chang,Mingfeng Ge,Qian Mei,Wen-Fei Dong
Two-dimensional (2D) MXenes have shown a great potential for chemical sensing due to their electric properties. In this work, a Ti3C2Tx/polypyrrole (MXene/PPy) nanocomposite has been synthesized and immobilized into a glassy carbon electrode to enable the simultaneous recognition of dopamine (DA) and uric acid (UA) under the interference of ascorbic acid (AA). The multilayer Ti3C2TxMXene was prepared via the aqueous acid etching method and delaminated to a single layer nanosheet, benefiting the in-situ growth of PPy nanowires. The controllable preparation strategy and the compounding of PPy material remain great challenges for further practical application. A facile chemical oxidation method was proposed to regulate magnitude and density during the forming process of PPy nanowire, which promotes the conductivity and the electrochemical active site of this as-prepared nanomaterial. The MXene/PPy nanocomposite-modified electrode exhibited the selective determination of DA and UA in the presence of a high concentration of AA, as well as a wide linear range (DA: 12.5–125 μM, UA: 50–500 μM) and a low detection limit (DA: 0.37 μM, UA: 0.15 μM). More importantly, the simultaneous sensing for the co-existence of DA and UA was successfully achieved via the as-prepared sensor.Keywords:simultaneous recognition;dopamine;uric acid;MXene/PPy nanocomposite
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2022
·
IF 4
Yanhua Lei,Mengchao Ding,Haikun Wu,Di Yin,Yang Li,Bochen Jiang,Kai Sun,Yuliang Zhang,Hailiang Du
In this work, the layered Ti 3 C 2 T x MXene were coated with polypyrrole particles by an in-situ polymerization method, and their electromagnetic wave absorption performance were systematically studied. The MXene/PPy composites presented an excellent electromagnetic wave absorption performance, the strongest reflection loss can reach − 68 dB at 2.68 mm. Meanwhile, when the thickness is 2.26 mm, the effective absorption bandwidth can reach 6.56 GHz (from 11.44 to 18 GHz), covering the entire K u band (12–18 GHz). The multiple reflections at the heterogeneous interface, and the synergistic effect between the layered MXene and the conductive polypyrrole network made a combined effect on the optimized absorption. The MXene/PPy composites with a strong electromagnetic wave absorption, wide effective absorption bandwidth and corrosion resistance have a great value in aircraft and vessel fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiayu Xie,Ying Zhang,Huajun Wang,Gang Li,Wenfeng Qin,Chuanxi Lin,Ronghui Guo
Ice formation seriously affect helicopter flight performance, and serious ice accumulation will greatly threaten helicopter travel safety. To avoid the complex measures for surface ice protection and achieve integration, in this work, an ice defense membrane that based on polypyrrole (PPy) modified Ti 3 C 2 T x (MXene) and polydimethylsiloxane (PDMS) encapsulation was proposed. The test results show that membrane integrate the hydrophobicity (Contact angle could reach to 140.1°), dual-drive thermal property (Temperature of membrane could arrive at 116℃ and 68.3℃ at 7 V voltage supply and 100 mW/cm 2 near-infrared radiation, respectively), and micro-strain sensibility (0.05 % tiny strain for membrane could be sensed). Membrane with multifunction and high-integration can be effectively used in ice management. Anti-icing, deicing and ice detection tests were carried out to confirm the efficiency in passive anti-icing, active deicing, and ice formation detection. Moreover, an intelligent ice defense system based on the membrane and hardware circuit has been designed. This work puts forward a membrane with multifunctional integration for ice defense, which could powerfully deal with the icing problem for the aviation field in the future.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shuxia Li,Jia-Horng Lin,Hai-Tao Ren,Bing-Chiuan Shiu,Fei Sun,Ching-Wen Lou,Ting-Ting Li
Oil spills and the discharge of organic wastewater have posed a severe danger to environmental security. To address this issue, various functional oil/water separation materials for wastewater purification have been developed. In this work, MXene/PPy was loaded on PP fiber by simple in-situ polymerization and vacuum-assisted filtration technology. Polypropylene was modified by dopamine (PDA) through in-situ polymerization, to improve the loading fastness of MXene/PPy on the surface of PP. To increase the durability of the fiber membrane, the pH-responsive polymer (PDM) was simply immersed on the outer layer. The successfully prepared PP-MXene/PPy-PDM has excellent pH response and photothermal conversion performance. When pH= 2, the water contact angle (WCA) was 52°. When pH= 12, WCA was 125°. The surface of PP-MXene/PPy-PDM was heated to 104.6 ℃ in ten minutes under the irradiation of 2 kW·m −2 . PP-MXene/PPy-PDM could continuously separate oil/water mixture for 12 h, and the highest separation flux was 3.87 kg·m −2 ·h −1 . Moreover, PP-MXene/PPy-PDM has excellent stability, corrosion resistance and recyclability . This study provided a new strategy for preparing intelligent responsive fiber composite membrane for oil-water separation, which has a wide range of practical applications in the treatment of oily wastewater.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chunqing Yang,Dongzhi Zhang,Dongyue Wang,Huixin Luan,Xiaoya Chen,Weiyu Yan
Flexible strain sensors have significant progress in the fields of human–computer interaction, medical monitoring, and handwriting recognition, but they also face many challenges such as the capture of weak signals, comprehensive acquisition of the information, and accurate recognition. Flexible strain sensors can sense externally applied deformations, accurately measure human motion and physiological signals, and record signal characteristics of handwritten text. Herein, we prepare a sandwich-structured flexible strain sensor based on an MXene/polypyrrole/hydroxyethyl cellulose (MXene/PPy/HEC) conductive material and a PDMS flexible substrate. The sensor features a wide linear strain detection range (0–94%), high sensitivity (gauge factor 357.5), reliable repeatability (>1300 cycles), ultrafast response–recovery time (300 ms), and other excellent sensing properties. The MXene/PPy/HEC sensor can detect human physiological activities, exhibiting excellent performance in measuring external strain changes and real-time motion detection. In addition, the signals of English words, Arabic numerals, and Chinese characters handwritten by volunteers measured by the MXene/PPy/HEC sensor have unique characteristics. Through machine learning technology, different handwritten characters are successfully identified, and the recognition accuracy is higher than 96%. The results show that the MXene/PPy/HEC sensor has a significant impact in the fields of human motion detection, medical and health monitoring, and handwriting recognition.
研究领域:
材料科学
·
生物医学工程
·
人工智能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Ting Liu,Na Zhang,Kaili Zhang,Yan Wang,Yiming Qi,Meng Zong
Two-dimensional layered metal carbides (MXene) have a broad application prospect in electromagnetic absorption, but suffer from poor impedance matching, which limits the absorbing performance. Herein, an efficient nanocomposite absorber was successfully prepared via loading Co-substituted β 2 -keggin-type polyoxometalate doped with polypyrrole and Fe 3 O 4 on the surface of MXene . Polyoxometalate and HCl as a proton acid doped polypyrrole, with anions attached to the main chain, could adjust the electromagnetic parameters, making the nanocomposites material easily achieve the best conductivity and impedance matching; Fe 3 O 4 introduced magnetic loss, and the freedom of movement of Fe 2+ and Fe 3+ caused multiple polarization; dipole polarization was induced by defects, dipoles and dangling bonds in nanocomposites; the charge accumulated at the three phase interface and led to interfacial polarization. We had conducted research on the absorbing properties of nanocomposites with different as-prepared unitary to ternary products, loading rates and component proportion. When the filling level was 45 wt%, an optimal reflection loss value of MXene/PPy@β 2 -SiW 11 Co/Fe 3 O 4 nanocomposites at only 1.7 mm reached up to −62.6 dB, and the effective absorption bandwidth of 9 GHz could be obtained at the low thickness range of 1.5–2.9 mm. These results demonstrated that the prepared nanocomposites were expected to be a promising electromagnetic wave absorber with thin thickness and high absorption intensity.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Shun Lu,Chaohu Xiao,Min Yin,Yang Jin,Shuqin Xu,Qi-Meige Hasi,Yuhan Zhang,Lihua Chen
Solar-driven interfacial evaporation (SIE) is a promising fresh water acquisition technology to address the global water resource shortage. Therefore, solar evaporators with efficient photothermal conversion efficiency and multifunctional purification capabilities are still in high demand. At present, a variety of photothermal conversion materials have been explored, however, there are few studies on integrating interfacial evaporation and photocatalytic capabilities into one solar steam generation system collaboratively. In this work, a new double-layered solar interfacial evaporator (MXene/PPy-ACA) was fabricated by using polymeric ionic liquid grafted attapulgite (ATP-PIL) as the matrix and modified the upper surface by MXene and polypyrrole (PPy). The evaporator can not only carry out seawater desalination efficiently, but also has good photocatalytic degradation effect on organic dyes. The MXene/PPy-ACA achieves an evaporation rate of 1.53 kg m −2 h −1 and corresponding to an efficiency of 92.17 % under irradiation of 1 sun. In addition, duing to the ionic repulsion effect of ATP-PIL, the MXene/PPy-ACA possesses good salt resistance. When tested in 20 wt% high brine, the evaporation rate is measured to be 1.40 kg m −2 h −1 . Moreover, owing to the superb photocatalytic properties of MXene and PPy, the MXene/PPy-ACA exhibits remarkable photocatalytic efficiency towards organic dyes, achieving degradation rates of 94.9 %, 67.49 %, and 65.11 % for methyl orange (MO), rhodamine B (RhB), and methylene blue (MB), respectively. The prepared interfacial evaporation system can also run stably in acid and alkali solution, and has a good practical application prospect. This study may offer an alternative approach in achieving clean water via SIE of seawater and complex wastewater.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Guoqing Feng,Shihan Wang,Siqing Wang,Pengcheng Wang,Chuntao Wang,Andargie Abebe Setiye,Massamba-Courtois Joanes Benedicte,Jingkun Xiao,Chengwen Song
Assembling a heterojunction-based composite nanomaterial to simultaneously achieve higher response and superior selectivity towards NO 2 under room-temperature conditions remains a great challenge. In this work, the MXene@Polypyrrole heterojunction was synthesized via a facile in-suit chemical polymerization approach. The distribution of sphere-like PPy nanoparticles was confirmed via various characterization techniques. The response value of the 0.5MXP sensor toward 50 ppm NO 2 is significantly higher than that of the pristine MXene based sensor, entailing greater response (6.5-fold). Nearly 98.11% recovery to the base resistance was observed in each sensing cycle. Noteworthy, the Schottky barriers formed between MXene and PPy contact surface, leading to the ideal selectivity and a lower limit of detection. Additionally, the sensor was tested for a 31-days-period with minimal deviation, predicting outstanding reproducibility and durability. The detailed polypyrrole sensitization mechanism containing selectivity mechanism, underlying heterojunction mechanism as well as the Density Function Theory (DFT) calculation were also revealed, offering new ideas for the development of room-temperature nitrogen dioxide sensors. Simultaneously, DFT calculation (21 models, 42 images) revealed the adsorption energy, electron transfer , and charge density differences between the NO 2 molecules and the substrate (MXene, PPy and MXene@PPy). In summary, the outstanding MXene surface functionalization has been exploited by decorating with polypyrrole (PPy) nanoparticles.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）