ACS Applied Nano Materials
·
2024
·
IF 5.3
Peng Tang,Jiawei Du,Mang Li,Xueying Zhao,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
Core–shell structures are commonly employed in microwave absorption (MA) materials due to their distinctive interfacial architecture. In this study, ferroferric oxide@polypyrrole (Fe3O4@PPy) nanocomposites with hollow core–shell structures were successfully synthesized for MA using a solvothermal process, followed by in situ polymerization. The minimum reflection loss (RLmin) frequency of the nanocomposites can be precisely controlled by adjusting the thickness of the PPy shell. The thickening of the PPy shell enhances the conduction loss of the nanocomposites, thus, enhancing the dielectric loss of the nanocomposites. The fabricated FP-170, FP-180 and FP-190 nanocomposites exhibit remarkable MA properties at low frequencies, with their RLmin reaching −63.82 dB, −84.92 dB, and −71.25 dB at 4.55 mm, 3.87 mm, and 2.64 mm, respectively. The maximum effective absorption bandwidth (EABmax) of FP-170 extends to 3.48 GHz at 2.39 mm, FP-180 extends to 4.20 GHz at 2.38 mm, and FP-190 extends to 4.96 GHz at 2.16 mm. The FP-200 nanocomposite, which has PPy shell thickness of 15 nm, exhibits exceptional radar stealth performance, with Radar Cross-Section (RCS) values below −17.68 dB·m2 within the range of −90° to 90°. Both simulation and experimental results prove that the hollow core–shell structured Fe3O4@PPy nanocomposite is an excellent candidate for MA applications.
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npj Flexible Electronics
·
2024
·Vol. 8
·期 1
·1-10
·
IF 12.3
Wang Chenhao,Wang Zhengyu,Wei Wei,Zhang Zhenjie,Li Anne Ailina,Huang Guanghao,Li Xian,Ge Shuzhi Sam,Zhou Lianqun,Kong Hui
As a stress hormone existing in the human body, cortisol can reflect the psychological stress and health status in daily life, and is a potential biomarker of the body’s stress response. To effectively collect sweat and accurately identify the target, this paper reports a flexible wearable cortisol detection device with outstanding reliability and sensitivity. Molecular imprinted polymer (MIP) ensures cortisol specificity. And carbon nanotubes (CNT) on electrodes increase sensitivity, expanding the detection range to 10 −3 to 10 4 nM, with sensitivity at 189.2 nA/lg(nM). In addition, porous chitosan hydrogel (PCSH) collects sweat effectively, its adhesive properties and 80% swelling rate offer a low-cost alternative to microfluidics. Flexible printed circuit board (FPCB) and serpentine electrode (SE) ensure device durability. This non-invasive, highly sensitive device offers a novel method for mental stress monitoring and clinical diagnosis, advancing human physiological state monitoring.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinghang Duan,Qiaolin Li,Tiantian Cao,Shengxiang Xiong,Gang Chen,Chengjun Dong,Hongtao Guan,Zongyou Yin
The development of advanced electromagnetic (EM) wave absorbers is crucial for applications in stealth technology and EM interference shielding. A major challenge in this field is achieving high absorption efficiency across a broad frequency range while maintaining lightweight and structurally robust materials. In this study, we successfully developed a precise and flexible synthesis strategy to prepare hollow C/Co/Mo2C cubes using Zn/Co(C4O4)(H2O)2 as a flexible template, which offers the advantages of simultaneous removal and easy control of metal Co content. The shell of the hollow cubes can be further optimized by changing the oxidizer content for polypyrrole (PPy). At optimum shell thickness and Co content, the C/Co/Mo2C-0.4 composites, featuring hollow but perforated structures, exhibit superior EM wave absorption properties, with a minimum reflection loss (RLmin) of −73.46 dB and an effective absorption bandwidth (EAB) of 5.20 GHz at 2.0 mm with 15 wt% filler. Detailed investigations reveal that the hollow C/Co/Mo2C-0.4 cubes provide polarization loss, conduction loss, magnetic loss, and optimal impedance matching characteristics, significantly enhancing EM wave absorption performance. This work offers a promising strategy for assembling multiple components into a hollow architecture, offering superior molybdenum carbide microwave absorbers.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guangyu Fang,Xiaorui Ma,Rong Hu,Jiao Dai,Haoran Tian,Lin Li,Weilin Xu,Yonggang Yao,Jun Wan
Fiber-based energy storage devices present distinct advantages over rigid alternatives, particularly for flexible and wearable applications. However, achieving stable integration of electrochemically active materials with fiber substrates remains a significant challenge, especially for carbon fibers (CF), due to their inherent physical smoothness and chemical inertness make them prone to interfacial separation under repeated bending and deformation in practical applications. In this study, we employed a salt template-assisted vapor-phase polymerization method to achieve horizontally oriented growth of 2D conductive polymer complex on CF, thereby forming a bamboo sheath-like structure with a 2D juxtaposed ultrathin nanosheet-coated fiber interface (2D-JUN-FI). The skinned nanosheets on CF ensure maximized interfacial binding in the vertical interfaces through extensive surface coverage and hydrogen bonding interaction, while maintaining the structure integraty in the horizontal plane, thus resulting in both high mechanical robustness and electron mobility under static and dynamic deformations. The synthesized electrode of 2D polypyrrole and amorphous niobium oxide on CF composites (2D Ppy/a-Nb 2 O 5 /CF) demonstrates high specific capacity and an exceptionally long cycling life (88.06 % capacitance retention after 5000 cycles). This template-assisted horizontal growth of the 2D-JUN-FI skinned structure provides a novel approach for developing high-stability and long-life flexible energy storage devices.
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TALANTA
·
2025
·
IF 6.1
En Han,Ting Gao,Ming Bao,Jianrong Cai
A novel strategy based on flower-like nanocomposite combined with molecularly imprinted polymers (MIP) was developed to achieve electrochemical sensing toward tert-butylhydroquinone (TBHQ) with high sensitivity and selectivity. The flower-like nanocomposite of gold nanoparticles functionalized zinc oxide nanoflowers (ZnO@Au NFs) was prepared by one-step in-situ reduction of gold nanoparticles on the exterior of zinc oxide nanoflowers. Subsequently, the electrodeposition of MIP was taken place on the surface of three-dimensional ZnO@Au NFs in the presence of monomer pyrrole and template molecule TBHQ by cyclic voltammetry, and the morphology of imprinted films could be clearly observed by scanning electron microscopy (SEM). The nanocomposite of ZnO@Au NFs provided a specific surface area of 9.94 m 2 /g for MIP electrodepositing due to a good deal of three-dimensional petal-like structures. More importantly, the obtained flower-like MIP nanocomposite increased the electroactive area and promoted the electrical signal when TBHQ was oxidized in the imprinted cavities, which significantly improved the sensitivity and selectivity for TBHQ determination. Under the optimal conditions, the proposed sensor was able to determine TBHQ within a broad linear range from 0.5 to 200 μM, with a detection limit as low as 58 nM. Besides, the practicability of this sensor was validated in real samples, obtaining well-pleasing recoveries from 95.0 % to 106.6 %. This flower-like MIP-based electrochemical sensor showed high sensitivity, good specificity and acceptable reproducibility, providing a promising platform for highly sensitive sensing of TBHQ.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kejun Zhong,Jie Xiang,Yu Liu,Chuanlin Song,Yuetong Mu,Ting Yao,Kai Zhao,Tianfeng Gu,Pengxiang Jia,Wenyan Zhang
Conductive hydrogels have been widely applied in biomedical and wearable electronic devices due to outstanding physical properties such as electrical conductivity, excellent flexibility, and biocompatibility. However, the poor swelling resistance of conventional conductive hydrogels would lead to a significant decrease in their electrical conductivity and mechanical strength in wet or underwater environments, which largely limited their application. Here, a high strength, swelling resistance, and conductive hydrogel was prepared via the formation of ketals. First, ketalization between hydroxyethyl methacrylate (HEMA) and polyvinylpyrrolidone (PVP) was conducted using acid as the catalyst. Then, the hydrogel was fabricated through the polymerization of HEMA in the presence of polypyrrole (PPy). The resulting hydrogel showed high mechanical strength (the tensile strength was 557.7 kPa, and the breaking elongation was 451.4 %, the toughness was 1730.7 kJ/m 3 ), good conductivity (0.78 S/m) and swelling resistance (the equilibrium swelling rate was 21.1 %). In addition, the hydrogel displayed excellent stability and high sensitivity as an underwater strain sensor. It was also found that the hydrogel indicated voltage piezoresistivity, photo deformation performance, charge storage properties, and high sensitivity for heavy metal ion detection. Thus, the obtained hydrogel had a huge application potential for multifunctional flexible underwater sensors.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qiang Wei,Wang Sun,Zhe Zhang,Guofu Zhou,Zhen Zhang
Phase change materials (PCMs) are promising for thermal energy storage due to their high latent enthalpy and constant phase change temperature. However, organic PCMs suffer from leaking, low thermal conductivity, and flammability. Herein, high thermal conductivity, photothermal and flame-proof docosane microcapsules with melamine-formaldehyde (MF) and polypyrrole (PPy) (C 22 -CMFP) were reported with cellulose nanocrystal (CNC) stabilized Pickering emulsion droplets as templates through in-situ polymerization. CNCs showed outstanding C 22 Pickering emulsifying ability with the presence of NaCl and provided ideal templates for C 22 microcapsules. The obtained C 22 -CMFP microcapsules displayed high enthalpy (205.7 J/g), C 22 core ratio (86.1 %), and stability. The C 22 -CMFP microcapsules retained an outstanding enthalpy remaining ratio (98.9 %) after 100 times cooling/heating cycles and could tolerate 100 °C for 12 h without leaking due to the robust hybrid CMFP shell. PPy significantly improved the thermal conductivity and photothermal conversion efficiency of C 22 -CMFP microcapsules. The C 22 -CMFP microcapsules exhibited a high thermal conductivity of 0.683 W/(m·K). The maximum temperature of C 22 -CMFP microcapsules under light irradiation for 18 min was 60.4 °C. Moreover, C 22 -CMFP microcapsules showed superb flame-proof properties. This study provides a facile approach to fabricate high enthalpy, stable, thermal conductive, photothermal, and flame-proof PCM microcapsules for solar harvesting and thermal energy storage.
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ACS Applied Electronic Materials
·
2024
·
IF 4.3
Xiao-xuan Fan,Mei-Chen Lin,Jia-Horng Lin,Xiangdong Fu,Xiaoyang Zhang,Baolei Shen,Xilin Liao,Lu Zhang,Ting-Ting Li,Ching-Wen Lou
The practical application of yarn electrode materials has been restricted because of the inherent insulating properties and adverse electrochemical properties of conventional yarns. The aim of the study was to make yarn electrodes with higher specific capacitance and construct a type of yarn-like manganese dioxide (MnO2) electrode. In this work, polyacrylonitrile-wrapped carbon fibers (CFs) core-spun yarn (CFP core spun yarn) was prepared by electrospinning with CF yarn as the base material. The highly conductive yarn (CFPP yarn) was then prepared by depositing polypyrrole nanoparticles by in situ polymerization on top of the CFP cored yarn. Finally, based on CFPP yarn, the CFPP@MnO2 yarn cathode material was prepared by coating MnO2 on CFPP yarn by an impregnation coating method. The CFPP@MnO2 yarn cathode showed outstanding electrochemical performance in the three-electrode system test, maintaining 89.76% of the initial capacity after 100 charge–discharge cycles at a current density of 1 mA cm–1, which indicates that the CFPP@MnO2 yarn cathode has outstanding cycling stability. The yarn cell can therefore be used as the cathode electrode for yarn batteries, providing an effective strategy for applications in smart textiles and wearable electronics.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tiantian Li,Zhining Huang,Mengfan Hu,Yuen Hu,Ke Quan,Man Zhou,Yao chen,Shaoju Fu
Heavy metal wastewater pollution has been a globally important and serious issue for the industrial manufacturing center. Herein, we developed a novel CAP@Ui0-66-NH 2 @PPy nanocomposite fibrous membrane, by combining the in-situ growth and oxidative polymerization technical routes, which possessed a high specific surface area and abundant amino-active sites to remove Cr (Ⅵ). Systematic characterization showed that the porous structure and in situ growth of MOF provided sites for polymerization of charged polypyrrole (PPy), resulting in the large specific surface area (78.837 m 2 /g) of CAP2@Ui0-66-NH 2 @10 %PPy. The maximum adsorption capacity was as high as 312.70 mg/g at 298 K, which was significantly better than that of CAP (CA and PVP electrostatic spinning and then washing off the PVP) nanomembranes. The adsorption process was consistent with the proposed secondary kinetic and Langmuir model, and the high adsorption capacity was maintained after five rounds of cyclic adsorptions. Through XPS analysis, the abundant amino groups on the surface of the adsorbent material were protonated, caused the electrostatic attraction and ion-exchange interaction with the anion Cr(Ⅵ). These protonated amino groups were able to reduce the toxic Cr (Ⅵ) to non-toxic Cr (Ⅲ), which was immobilized on the surface of the material through chelation. The MOF lattice achieved in-situ growth on porous CA nanofibrous membranes, which significantly enhances the mass-transfer dynamics and the membrane cycling stability, the amine-based functionalization of the UI0-66-NH 2 improved the coordination activity and increased the adsorption efficiency, and polypyrrole (PPy) conductive layer promoted the directional migration of Cr (VI) and effectively suppressed the interference of competing ions. In sum, the prepared CAP@Ui0-66-NH 2 @PPy hybrid fibrous membranes showing great potentially applicable for heavy-metal wastewater treatment.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Tongxin Xiao,Xige Wu,Hongbao Liang,Kangyue Qiao,Ying Chen
Solar-powered photocatalytic conversion of CO2 into green solar fuels is one of the effective ways to solve the global energy crisis and the greenhouse effect. A new artificial photosynthesis system composed of TiO2 nanotube arrays (TiO2NTs) and bimetallic porphyrin was fabricated, and their photocatalytic activities were evaluated by the reduction of gas-phase CO2 to CH4 under simulated solar irradiation. Compared to pure TiO2NTs and CoTCPP/TiO2NTs, bimetallic porphyrin-sensitized TiO2NTs displayed greatly ameliorated photocatalytic activity. Among them, Ni-CoTCPP/TiO2NTs exhibited the highest photoreduction efficiency, and the reduction rate of CO2 into CH4 was up to 52.27 μmol/cm2/h with the quantum efficiency of 1.002%, about 7 times higher than that of pure TiO2NTs. The increase in photocatalytic performance can be attributed to the enhancement of the light absorption capacity of Ni-CoTCPP/TiO2NTs and the higher charge separation efficiency. Furthermore, according to the results of the photocatalytic evaluation and photo(electro)chemical studies, a possible mechanism of CO2 photoreduction over Ni-CoTCPP/TiO2NTs was proposed.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Ling Li,Xiaojuan Zhang,Bianying Wen
A highly efficient electromagnetic wave-absorbing material with a low filler amount is urgently pursued to suppress unwanted electromagnetic radiation issues. To exploit this kind of absorber, constructing a one-dimensional (1D) structure holds exceptionally great importance. Herein, 1D polypyrrole (PPy) nanochains with different conductivities have been successfully synthesized through the combined utilization of chemical oxidative polymerization and a soft template method. When the mass ratio of PPy nanochains is regulated in a flexible thermoplastic polyurethane (TPU) matrix, PPy-1/TPU composites emerge with superior wave attenuation capacity with an optimal reflection loss of −50.4 dB at 2.55 mm and an effective absorption bandwidth of 3.76 GHz at 2.62 mm when the filler loading is only 7 wt %. The potential dissipating mechanism is mainly attributed to the enhanced synergistic effects of a unique 1D chain structure, conduction loss, and dielectric loss. This work paves a promising pathway for fabricating an excellent wave-absorbing candidate with low filler content by employing a single absorbent.
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MOLECULES
·
2024
·Vol. 29
·期 10
·2331
·
IF 4.2
Renzhou Hong,Xijun Zhao,Rongyu Lu,Meng You,Xiaofang Chen,Xiaoming Yang
Conducting polymers like polypyrrole, polyaniline, and polythiophene with nanostructures offers several advantages, such as high conductivity, a conjugated structure, and a large surface area, making them highly desirable for energy storage applications. However, the direct synthesis of conducting polymers with nanostructures poses a challenge. In this study, we employed a hard template method to fabricate polystyrene@polypyrrole (PS@PPy) core–shell nanoparticles. It is important to note that PS itself is a nonconductive material that hinders electron and ion transport, compromising the desired electrochemical properties. To overcome this limitation, the PS cores were removed using organic solvents to create hollow PPy nanospheres. We investigated six different organic solvents (cyclohexane, toluene, tetrahydrofuran, chloroform, acetone, and N,N-dimethylformamide (DMF)) for etching the PS cores. The resulting hollow PPy nanospheres showed various nanostructures, including intact, hollow, buckling, and collapsed structures, depending on the thickness of the PPy shell and the organic solvent used. PPy nanospheres synthesized with DMF demonstrated superior electrochemical properties compared to those prepared with other solvents, attributed to their highly effective PS removal efficiency, increased specific surface area, and improved charge transport efficiency. The specific capacitances of PPy nanospheres treated with DMF were as high as 350 F/g at 1 A/g. And the corresponding symmetric supercapacitor demonstrated a maximum energy density of 40 Wh/kg at a power density of 490 W/kg. These findings provide new insights into the synthesis method and energy storage mechanisms of PPy nanoparticles.
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