COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Shixiang Zhou,Li Yao,Hui Mei,Mingyang Lu,Laifei Cheng,Litong Zhang
As the operation reliability for gas sensors under complex environments is in increasing demand, the stability and safety performance are significant besides qualified gas sensing properties. In this work, structural-strengthened and self-protective ammonia sensing micro-tunnels were constructed by 3D printing . Modified methyl-silsesquioxane (MK) resin was employed as the feedstock to build the SiOC honeycomb structures . Polypyrrole (PPy) nanoparticle decorated TiO 2 arrays sensitized the structures to form inner gas-sensitive tunnels . The sensing structure exhibited high selectivity toward ammonia at room temperature. Response to 50 ppm NH 3 was 18.67%, while the response and recovery times were 119 and 86 s, respectively. The excellent long-term stability also ensured reliable operation in complex environments. More importantly, the enhanced honeycomb had an outstanding mechanical performance with the compressive strength , Young's modulus , and energy absorption of 33.72 MPa, 2.40 GPa, and 28.22 kJ/m 3 , respectively. It can serve as a load-bearing part of the fundamental component to avoid catastrophic collapse while maintaining a regular sensing capability under pressure loading as the excellent deformation resistance ensured the integrity and connection of the sensing layer. Moreover, the inner through-holes facilitated the exposure of the sensing tunnels to the atmosphere, which can detect target gas simultaneously without the embedding of extra sensors. Thus, the construction of self-protective gas sensing structures was promising to be an efficient strategy for reliable gas detection in extreme environments.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2012
·
IF 3.759
Yi Fang,Yalong Ni,Guohui Zhang,Chun Mao,Xiaohua Huang,Jian Shen
The intrinsic properties and application potential of nanocolloids are mainly determined by size, shape, composition , and structure. In this case, a novel glucose biosensor was developed by using the chitosan–polypyrrole (CS–PPy) nanocomposites as special modified materials that coating onto the surface of glassy carbon electrode (GCE). The CS–PPy nanocomposites were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. Moreover, the interaction of CS–PPy nanocomposites with glucose oxidase (GOD) was also investigated by the combined studies with Fourier transform infrared spectroscopy (FTIR) and circular dichroism spectroscopy (CD). Due to the conductivity of polypyrrole (PPy), good biocompatibility of CS, and advantages of nanoparticles , CS–PPy nanocomposites were chosen and designed to modify the GCE for the retention of GOD's biological activity and the vantage of electron transfer between GOD and electrodes. The GOD biosensor exhibited a fast amperometric response (5 s) to glucose, a good linear current–time relation over a wide range of glucose concentrations from 5.00 × 10 − 4 to 1.47 × 10 − 1 M, and a low detection limit of 1.55 × 10 − 5 M. The GOD biosensor modified with CS–PPy nanocomposites will have essential meaning and practical application in future that attributed to the simple method of fabrication and good performance.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jingjing Dong,Ying Lin,Hanwen Zong,Haibo Yang
In this work, a core-shell hierarchical LiFe 5 O 8 @PPy nanocomposite has been successfully fabricated through a simple etching/regrowing method. The core buffer of highly conductive PPy nanotubes is introduced to enhance the electrochemical performance of LiFe 5 O 8 . Owing to improved electron transfer capability, charge transfer resistances of the core-shell nanostructured composites are decreased and the electrochemical properties are enhanced. The representative LiFe 5 O 8 @PPy nanocomposite exhibits a high specific capacitance of 292 F g −1 at a scan rate of 5 mV s −1 , and an excellent cycling stability (82.99% after 10,000 cycles) because of the synergistic effect of LiFe 5 O 8 nanosheets and PPy nanotubes. This study confirms that the as-prepared LiFe 5 O 8 @PPy nanocomposites are promising candidates for supercapacitor electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Huiting Xi,Xingguang Chen,Yao Cao,Junjun Xu,Cuizhu Ye,Danwen Deng,Jinsheng Zhang,Ganhui Huang
Formaldehyde is a poison around us. We described an electrochemical sensor based on polypyrrole(PPy)-reduced gold for the sensitivity detection of formaldehyde. The pyrrole was modified on glassy carbon electrode by potentiostatic method to obtain PPy/GCE. The gold nanoparticles (AuNPs) were decorated to the PPy/GCE after the treatment of the polypyrrole by overpotential. Thus, a AuNPs-polypyrrole composite modified glassy carbon electrode (AuNPs /PPy/GCE) was obtained. The material was characterized by SEM, EDX and XPS. The optimization of modification conditions for polypyrrole and AuNPs was determined. The PPy/GCE modified by AuNPs has high conductivity and excellent catalytic activity because of its large current response. The formaldehyde detection sensor based on AuNPs /PPy/GCE was established, and the quantitative determination of formaldehyde was carried out by differential pulse voltammetry(DPV). The electrochemical sensor has high selectivity, reproducibility and stability for formaldehyde detection. The sensor can be used to detect formaldehyde in pure water with detection line of 20 μM. The sensor can also be used to detect formaldehyde in milk with detection line of 0.4 mM.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Jingyan Tian,Leilei Zhang,Junnan Li,Lian Ma,Jianhao Wang,Zebin Chen,Yuping Wu,Qianting Wang,Xiaoyun Ye
With the development of radar stealth technology and electronic communication technology, electromagnetic (EM) wave absorbing materials with lightweight and broad absorbing bandwidth are widely expected. In this study, the multi-walled carbon nanotubes (MWCNTs)/reduced graphene oxide (rGO)/polypyrrole (PPy) ternary composites were prepared by in-situ polymerization under hydrothermal conditions. The effects of carbon substrate of MWCNTs/rGO and the content of PPy on the microwave absorption (MWA) properties of the ternary composites and the corresponding attenuation mechanism were investigated. The results showed that MWCNTs and rGO nanosheets interweave together to form a relatively uniform micro-network structure with even wrapping of PPy on the surface of MWCNTs/rGO substrate. The adjustable amount of PPy optimizes the impedance matching and EM wave attenuation capacity. The composites achieve effective absorption bandwidth (EAB) of 4.6 GHz at 2.1 mm, and the minimum reflection loss (RL min ) value of −57 dB at 15.8 GHz. The multi-void network structures formed by MWCNTs and lamellar rGO and the interfacial polarization between MWCNTs/rGO composite carbon substrate and PPy can effectively decay EM wave absorption, thus improving the MWA performance of the composites. This work provides an effective reference for the application of multi-component carbon composites in the field of microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2021
·Vol. 34
·期 2
·316-325
·
IF 3.223
Guyang Ning,Haiyang Wang,Mingxuan Fu,Jiaxian Liu,Yuena Sun,Haijun Lu,Xinyu Fan,Yufan Zhang,Huan Wang
A highly sensitive electrochemical sensor based on both potential and current dual signals was constructed via polypyrrole-coated chiral carbon nanotubes (L/D-CNT@PPy) loaded with Pt nanoparticles (Pt NPs) and β-cyclodextrin (β-CD) hybrid. Using L/D-CNT and β-CD as chiral selectors, PPy and Pt NPs enhanced the conductivity and the sensors showed excellent performance for chiral recognition of tyrosine (Tyr) and tryptophan (Trp). The linear ranges of the D-CNT@PPy@Pt NPs@β-CD sensor were 3–30 μM (Tyr) and 19.6–196 μM (Trp), respectively, the detection limits were 0.107 nM (Tyr) and 0.133 nM (Trp), respectively, and the recoveries for L-Tyr were 96.56 %–106.32 %. This electrochemical sensor based on a dual-signal strategy of potential and current was expected to be used in the field of point of care testing (POCT).
研究领域:
分析化学
·
生物医学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Xiong Zhengrong,Zhang Hang,Zhou Yan,Yang Yuming
Polycarbonate-based polyurethanes (PCU) are frequently used in airship envelope materials because of its outstanding mechanical performances and aging resistance. However, the surface of PCU is likely damaged during processing and operating and the emerged minuscule cracks will lead to deterioration of perfomances for airship’s envelope materials. Herein, self-healing PCU/polypyrrole nanoparticles (PPy) composites were prepared by solution blending and quick healing of specific area for PCU was realized due to the high photo-thermal conversion merit of PPy. The results show that, the mechanical properties of PCU/PPy composites can be restored to more than 80% and the gas barrier properties can also be basically repaired when irradiating the destroyed surface using near-infrared light for only 60s. In addition, the ultraviolet visible (UV-vis) shielding performance of the PCU/PPy composites was enhanced significantly and the UV-vis transmittance was less than 14% and 2% with 0.25wt% and 0.5wt% PPy, respectively. Meanwhile when 0.25wt% PPy was added, the tensile strength increased from 17.9MPa to 21.7 MPa and the elongation at break increased from 647% to 829%. Besides, the thermal decomposition temperature at 5wt% loss increased from 277.8°C to 300.7°C and 304.88°C with 0.25 wt% and 0.5 wt% PPy, respectively. The prepared composites show promising application in aerospace domain.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng Tang,Xueying Zhao,Jiawei Du,Mang Li,Haining Qian,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In this study, hollow Co@SiO 2 @PPy composites with excellent electromagnetic wave (EMW) absorption performance were successfully synthesized. The monodisperse hollow Co microspheres were prepared using a solvent-thermal method. The microspheres were then coated with an SiO 2 layer by a modified Stöber method. Finally, the SiO 2 layer was surface-coated by polypyrrole (PPy) through in-situ polymerization to obtain Co@SiO 2 @PPy composite materials with hollow core–shell structures. The prepared CSP2 composite achieved a minimum reflection loss (RL min ) of −65.83 dB at 1.86 mm, demonstrating an effective absorption bandwidth (EAB) of 4.84 GHz. The CSP3 composite achieved a widest EAB (EAB max ) of 5.4 GHz at a thickness of 1.83 mm, while simultaneously maintaining the RL level at −50.70 dB. Additionally, it demonstrated an RL min value of −61.66 dB with a thickness as thin as 1.66 mm. The observed shift of FTIR absorption peaks by 20 cm −1 in the PPy ring provides compelling evidence for the involvement of multilayered structures in polarization loss. The SiO 2 layer not only enhances the interface polarization but also prevents corrosion of the Co core by acidic solutions. The exceptional EMW absorption characteristics can be attributed to the effective impedance matching and the combined effect of magnetic and dielectric losses.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Muneerah Alomar,Lamia Abu El Maati,Muhammad Sultan Irshad,Naila Arshad,Afraa Alotaibi,Van-Duong Dao
The fabrication of sustainable solar-powered interfacial evaporators is essential for addressing global water scarcity challenges. Herein, we propose a new photothermal evaporator by applying a zirconium carbide-polypyrrole (ZrC-PPy) composite coating to a cellulose filter (CF) possessing enhanced photothermal conversion. The 3D photothermal evaporator is constructed by integrating a ZrC-PPy@CF evaporator onto triangular polyurethane (PU) foam. With a poor thermal conductivity of 0.078 W m −2 K −1 , the synthesized evaporator allowed effective heat localization under light. The evaporator produced an evaporation rate of 1.92 kg m −2 h −1 with a corresponding photothermal conversion efficiency of 89%. Additionally, the evaporator achieved over 99.9% rejection of common metal ions (Na + , K + , Ca 2+ , Mg 2+ ) from saline water, yielding high-quality freshwater. These findings highlight the ZrC-PPy@CF evaporator as a scalable and versatile platform for efficient wastewater treatment and desalination.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Minghao Wu,Jian Chen,Chong Wang,Fuqing Wang,Baolian Yi
Non-graphitic carbon nanotubes (NGCNTs) are successfully prepared by carbonization of polypyrrole (PPy) nanotubes precursor synthesized via a self-assembly process. It is observed from transmission electron microscopy (TEM) that the diameter and length of the NGCNTs are 100–200 nm and 2–10 μm, respectively. The electrochemical performances of the NGCNTs are evaluated by cyclic voltammograms and galvanostatic discharge–charge cycling. The results show that NGCNTs deliver an initial reversible capacity of 635.7 mAh g −1 at current density of 100 mA g −1 with a high capacity retention ratio of 85.7% after 150 cycles. Even up to 4 A g −1 , the reversible capacity of NGCNTs remains in 280.1 mAh g −1 . The improved performance of NGCNTs is attributed to the non-graphitic form, tubular morphology and cross-linked conducting networks. Therefore, it is a potential anode material for lithium-ion battery.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Zhouyu Tong,Rongzhen Wang,Yuxin Bi,Yan Chen,Kwok L. Chung,Yong Ma
Nowadays, ferrites/carbon fibers have attracted considerable attention as microwave absorption materials (MA) due to the synergistic effect between dielectric and magnetic loss. Herein, the ZnFe 2 O 4 /C fibers were fabricated via electrospinning and calcination methods, and then polypyrrole (PPy) successfully coated on the fibers via oxidative polymerization. The ZnFe 2 O 4 /C@PPy composites exhibit enhanced EM wave absorption performance with the loading of 25 wt%. The optimal reflection loss (RL) value is up to −66.34 dB (13.80 GHz) and effective absorption bandwidth (EAB) is 5.74 GHz (11.78–17.52 GHz) with a matching thickness of 1.93 mm. Besides, high-efficient absorption performance of the ZnFe 2 O 4 /C@PPy composites is mainly attributed to the dielectric loss and ideal impedance matching. This study reveals a novel approach to development of ferrites/carbon fibers coated with PPy, and the ZnFe 2 O 4 /C@PPy composites exhibit great potential application as the materials with high-efficient absorption properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2015
·Vol. 26
·期 42
·425101
·
IF 3.821
Jun Zhou,Jinghua Li,Xingwei Ding,Junjie Liu,Zhong Luo,Yun Liu,Qichun Ran,Kaiyong Cai
In recent years, magnetic hyperthermia nanoparticles have drawn great attention for cancer therapy because they have no limitation of tissue penetration during the therapy process. In this study, cubic nanoporous Fe2O3 nanoparticles derived from cubic Prussian blue nanoparticles were used as magnetic cores to generate heat by alternating the current magnetic field (AMF) for killing cancer cells. In addition, polypyrrole (PPy) was coated on the surfaces of the cubic Fe2O3 nanoparticles to load doxorubicin hydrochloride (DOX). The PEG component was then physically adsorbed onto the surfaces of the nanoparticles, resulting in a Fe2O3@PPy-DOX-PEG nanocomposite. The nanocomposite was triggered by acid stimulus and AMF to release DOX, resulting in a remarkable combination therapeutic effect via chemotherapy and magnetic hyperthermia. Furthermore, the nanocomposite could realize magnetic resonance imaging (MRI) due to the magnetic core structure. The study provides an alternative for the development of new nanocomposites for combination cancer therapy with MR imaging in vivo.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 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）