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Reduced Graphene Oxide Aerogels with Uniformly Self-Assembled Polyaniline Nanosheets for Electromagnetic Absorption
摘要： Reduced Graphene Oxide (RGO)/polyaniline (PANI) composite aerogels (GPA) with uniformly distributed PANI nanosheets were prepared by a facile self-assembly way. The fabricated hybrids present a cross-linked three-dimensional(3D) porous network and RGO sheets were covered by PANI sheets with controlled content. The unique architecture efficiently reduced agglomeration of RGO and enhanced the conductive loss of the material to incident wave. Specifically, the GPA composite with 50 wt% PANI showed excellent electromagnetic wave absorption capacity, the largest reflection loss (RL) value reached -48 dB with fill loading of only 3% and the qualified bandwidth (RL ≤-10 dB) covered the entire Ku band (12-18 GHz). The study is expected to pave the way to prepare wide qualified bandwidth and lightweight graphene-based electromagnetic wave absorption hybrids with controlled microstructure.
关键词： conductive network,3D porous structure,electromagnetic wave absorption,self-assembly,light weight
更新于2025-09-23 15:21:01
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Visible light photocatalytic degradation of tetracycline with porous Ag/graphite carbon nitride plasmonic composite: Degradation pathways and mechanism
摘要： Ag/g-C3N4 plasmonic photocatalysts with porous structure ( Ag/PCN ) were successfully synthesized via a thermal exfoliation strategy and photo-reduction method. Owing to the combined merits of porous structure and surface plasmon resonance effect of silver nanoparticles, the Ag/PCN catalysts exhibited excellent photocatalytic performance for the degradation of antibiotic agents. With the optimal Ag loading, the Ag/PCN-2 catalyst exhibited the optimal catalytic activity for TC degradation under visible light, which shows about 11.8 times enhancement in the photocatalytic removal efficiency as compared to pure g-C3N4, respectively. This phenomenon can be attributed to the increased specific surface area, broadened visible light absorption and improved charge separation. The radical quenching results confirmed that h+ and ·O2- radicals were the major active species during removal of TC. The degradation of TC is increased with the increment of Ag/PCN-2 catalysts, and the optimum catalyst was found to be 1.67 g/L. The hindering effect of selected of anions ( Cl-, CO3-, H2PO4- ) was found to follow the order H2PO4- > CO3- > Cl-. Ag/PCN-2 sample also possessed high stability after six cycles of reuses. Furthermore, the possible degradation pathways of TC and photocatalytic mechanism over Ag/PCN-2 were proposed in detail.
关键词： g-C3N4,Antibiotic,Degradation pathway,Photocatalysis,Porous structure,Ag
更新于2025-09-23 15:21:01
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A novel design of poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate)/molybdenum disulfide/poly (3,4-ethylenedioxythiophene) nanocomposites for fabric micro-supercapacitors with favourable performances
摘要： Fabric supercapacitors with mechanical flexible and excellent energy storage capacity attract considerable attention for the potential application in wearable smart electronics. A novel ternary composite electrode and assembled all-solid-state fabric supercapacitors are expected to achieve favorable electrochemical performances. The facile vapor phase polymerization method is employed to fabricate the ternary poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate)/molybdenum disulfide/poly (3,4-ethylenedioxythiophene) composite electrodes. The molybdenum disulfide nanograins are incorporated into the conducting polymer matrix which further facilitates the formation of hierarchical porous structures. On account of profitable synergistic effect among three-component materials and porous structure with reinforced electronic/ionic transport, the as-prepared hybrid electrode exhibits a high areal capacitance of 51.01 mF/cm2 at current density of 0.1 mA/cm2, as well as long cycling durability with 93.6% capacitance retention after 5000 cycles of galvanostatic charge/discharge tests. Furthermore, symmetric fabric micro-supercapacitor assembled by the as-prepared electrodes is also evaluated in a belt-shaped device. This assembled device exhibits an energy density of 0.2 μWh/cm2 (1.81 mWh/cm3) and the power density of 0.09 mW/cm2 (0.82 W/cm3). These results of excellent flexibility and favourable capacitive performance indicate a promising application in portable and wearable electronic devices.
关键词： synergistic effect,ternary nanocomposites,porous structure,flexible micro-supercapacitors
更新于2025-09-23 15:19:57
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Type II heterojunction in hierarchically porous zinc oxide/graphitic carbon nitride microspheres promoting photocatalytic activity
摘要： Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/ graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV-Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that ?O2- and h+ are the main active species for ZnO/g-C3N4 in degradation of RhB.
关键词： Active species,Heterojunction,Photocatalytic activity,Hierarchically porous structure,ZnO/g-C3N4
更新于2025-09-10 09:29:36
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Petal-biotemplated synthesis of two-dimensional Co3O4 nanosheets as photocatalyst with enhanced photocatalytic activity
摘要： A biomorphic Co3O4 nanosheet was fabricated by using China rose petal as biotemplate. Ultraviolet-visible diffuse reflectance spectroscopy, nitrogen adsorption, Fourier-transform infrared spectroscopy, thermogravimetric analysis-differential scanning calorimetric analysis, scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction were utilized to characterize the samples. The results revealed that the synthesized Co3O4 sample exhibited the special 2D nanosheet morphology with the thickness of around 100 nm similar to the original petal. The 2D nanosheet structure and multiple-porous feature of the sample not only increased its specific surface area and more active sites for photodegradation reaction, but also facilitated mass transfer, light scattering and harvesting as well as inhibition of the photogenerated carrier recombination. Moreover, compared with the commercial Co3O4, the as-prepared Co3O4 nanosheet showed a superior photocatalytic activity due to its 2D multiple-porous nanosheet structure and high specific surface area (51.36 m2 g?1).
关键词： Petal,Biotemplate,Co3O4 nanosheet,Photocatalysis,Multiple-porous structure
更新于2025-09-09 09:28:46
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Nickel foam–caged Ag-Au bimetallic nanostructure as a highly rugged and durable SERS substrate
摘要： A three-dimensional nickel foam (NF) caging Ag-Au bimetallic nanostructure (Ag-Au@NF) has been demonstrated as a highly rugged and sensitive surface-enhanced Raman scattering (SERS) substrate. The main concept employed in designing this substrate was the protection of SERS-active nanostructures by holding them within a sturdy frame. For this purpose, NF was readily chosen as a strong porous frame to secure the internal nanostructures owing to its excellent structural strength and ability to easily incorporate analytes due to its porous structure. The next issue was the construction of stable and SERS-e?cient nanostructures within the NF frame. To meet this need, an Ag-Au bimetallic nanostructure was chosen, combining the high SERS e?ciency of Ag and the good surface stability of Au. To fabricate the Ag-Au nanostructure, ?rst a Sn-Ag alloy was constructed on the NF frame by means of electrodeposition (producing Sn-Ag@NF) and then Sn was selectively leached from the alloy by means of free corrosion in NaOH solution (producing Ag@NF). This selective leaching was adopted to make the surface rough to enhance the SERS e?ciency in the ?nal substrate. Finally, Au was incorporated into the Ag@NF by means of a galvanic replacement reaction (producing Ag-Au@NF). The use of Ag-Au@NF enabled identi?cation of rhodamine 6G at concentrations as low as 0.1 nM. The Ag-Au@NF substrates were rugged, showing small Raman signal drops after 100 cycles of sandpaper abrasion or 30 min of sonication. Also, the signal decrease was only 4.26% upon 3 days of exposure to ambient air without special care. Overall, the Ag-Au@NF developed herein shows practical merits for adoption in routine and ?eld SERS analyses.
关键词： Surface enhanced Raman scattering,High durability,Ag-Au nanostructure,Porous structure,Nickel foam
更新于2025-09-09 09:28:46
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Interface-induced enhanced electromagnetic wave absorption property of metal-organic frameworks wrapped by graphene sheets
摘要： Most of metal–organic frameworks (MOFs) themselves have low electrical conductivities, leading to bad electromagnetic wave (EMW) absorption properties. Herein we found that the EMW absorption property of zeolitic imidazolate frameworks-8 (ZIF-8) particles was improved unexpectedly after coupling them with graphene sheets. Experimental results and theoretical calculations indicated that well-defined interfaces between ZIF-8 and the graphene sheets were crucial to the improvement of EMW absorption property. Our strategy presented here may open a new way for designing other MOFs based hybrids for high-performance EMW absorbers.
关键词： Porous structure,Graphene-organics composites,Metal–organic frameworks,Electromagnetic wave absorption,Multiple interfaces
更新于2025-09-04 15:30:14