Facile synthesis of ultralight S-doped Co<sub>3</sub>O<sub>4</sub> microflowers@reduced graphene oxide aerogels with defect and interface engineering for broadband electromagnetic wave absorption

Gao, Hui; Chen, Shougang; Wei, Shuang; Li, Wen; Zhang, Mutian; Sun, Ning

doi:10.1039/d2tc02356c

Cited by 12 publications

(3 citation statements)

References 81 publications

(112 reference statements)

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“…XRD shows that at 2θ = ∼20°, all three samples have a wide graphite peak, indicating the presence of amorphous carbon in the samples . The diffraction peaks of the (100), (002), (101), (102), and (110) lattice planes of hcp Co are observed at 41.5, 44.6, 47.8, 62.7, and 75.9°, respectively, corresponding to hcp Co produced by the Co 3 O 4 reduction reaction . As the hydrogenation temperature increases to 300 °C, the Co 3 O 4 peak disappears, the intensities of the CoO and Co peaks increase, and the diffraction peak of CoO at 36.5° becomes sharper, indicating that Co 3 O 4 is converted to CoO in the temperature range of 200–300 °C …”

Section: Resultsmentioning

confidence: 95%

“…13 The diffraction peaks of the (100), ( 002 2c). The binding energy peaks at 779.1 and 794.4 eV correspond to the Co 2p 3/2 and Co 2p 1/2 orbitals, respectively, and the satellite peaks at 788.2 and 804.5 eV are amplified, 37 respectively (Figure 2d). Additionally, the peaks at 796.4 and 781.3 eV indicate the coexistence of Co 2+ and Co 3+ species in the composite.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Qin

Kimura

et al. 2023

ACS Appl. Nano Mater.

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To obtain microwave-absorbing materials with high absorptivity, broad bandwidth, and lightweight properties, Co 3 O 4 / lotus seedpod carbon (Co 3 O 4 /LSC) composites were reduced under a hydrogen pressure of 3 MPa. As the reduction temperature increases, the phases of the Co 3 O 4 /LSC composites change from Co 3 O 4 to CoO/Co. At 200 °C (named as the 3200 nanocomposite), partial Co 3 O 4 changes to CoO, the Co 3 O 4 completely transfers into CoO with a little Co detectable at 300 °C (3300 nanocomposite), and the concentration of Co increases more than that of the 3300 nanocomposite once temperature is raised to 400 °C (3400 nanocomposite). Moreover, the morphology of the Co 3 O 4 /LSC composites changes from irregular particles to a sintering state in the reduction process. When 3200, 3300, and 3400 nanocomposites are compared, the 3400 nanocomposite exhibits the highest permittivity and best microwave absorption performance: the 3400 nanocomposite exhibits a strong reflection loss of −60.63 dB (2.0 mm, 18.0 GHz) and an absorption bandwidth of 14.10 GHz (4.7 mm, 3.9−18.0 GHz). The hydrogenated LSC/Co 3 O 4 nanocomposite has a strong absorption capacity and wide effective bandwidth, is lightweight, and can be used as a high-performance biomass-based microwave-absorbing material.

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Section: Resultsmentioning

confidence: 95%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Qin

Kimura

et al. 2023

ACS Appl. Nano Mater.

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“…9,14,15 Heteroatom (metal or non-metal) doping has been demonstrated as an effective strategy to simultaneously obtain lowdensity and high-performance GA-based microwave absorbers. 16,17 The introduction of metal atoms will increase the density of states of the d orbitals near the Fermi level, resulting in enhanced conductive loss property. Meanwhile, metal-N moieties and defects can induce the formation of electric dipoles, which are beneficial to increasing the dipolar polarization loss.…”

Section: Introductionmentioning

confidence: 99%

Polarization genes dominated heteroatom-doped graphene aerogels toward super-efficiency microwave absorption

Huang¹,

Zhang²,

Yu³

et al. 2023

J. Mater. Chem. C

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Sea‐Urchin‐MnO₂ for Broadband Optical Modulator

Han

Feng

Chen

et al. 2022

Advanced Optical Materials

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Manganese dioxide (MnO2) is considered to be one of the nanomaterials with enormous value in research and application because of its high theoretical specific capacitance, large specific surface area and porosity, excellent electron transfer ability, and excellent light absorption ability. However, exploring superior nonlinear absorption of MnO2 in the broadband spectrum is still the key challenge to harvesting their greatest potential. In this paper, the optical modulator based on MnO2 is fabricated, and its nonlinear optical performance is measured. The results indicate that the modulation depth is 4.4% and the saturable intensity is 32.8 MW cm−2 at 1.5 µm region. What's more fascinating is that the modulator based on MnO2 is integrated into Er‐doped and Tm‐doped fiber resonators to successfully demonstrate its broadband mode‐locking operations. The coexistence of harmonic bound state pulse and conventional soliton pulse, as well as dual‐wavelength solitons, have been obtained in a communication window and conventional soliton in a 2 µm‐band can be also achieved. This demonstrates that MnO2 serves as a broadband optical modulator, which makes MnO2 more competitive in the future ultrafast photonics and helps to expand the frontier of photonic technology.

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Facile synthesis of ultralight S-doped Co₃O₄ microflowers@reduced graphene oxide aerogels with defect and interface engineering for broadband electromagnetic wave absorption

Abstract: The development of modern information technology has recently put forward higher requirements for the ingenious design of electromagnetic wave absorbing (EMA) materials with broad bandwidth at low filling ratio. Herein,...

Cited by 12 publications

References 81 publications

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Polarization genes dominated heteroatom-doped graphene aerogels toward super-efficiency microwave absorption

Sea‐Urchin‐MnO₂ for Broadband Optical Modulator

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Facile synthesis of ultralight S-doped Co3O4 microflowers@reduced graphene oxide aerogels with defect and interface engineering for broadband electromagnetic wave absorption

Abstract: The development of modern information technology has recently put forward higher requirements for the ingenious design of electromagnetic wave absorbing (EMA) materials with broad bandwidth at low filling ratio. Herein,...

Cited by 12 publications

References 81 publications

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co3O4 for High-Performance Microwave Absorbers

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co3O4 for High-Performance Microwave Absorbers

Polarization genes dominated heteroatom-doped graphene aerogels toward super-efficiency microwave absorption

Sea‐Urchin‐MnO2 for Broadband Optical Modulator

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Product

Resources

About

Facile synthesis of ultralight S-doped Co₃O₄ microflowers@reduced graphene oxide aerogels with defect and interface engineering for broadband electromagnetic wave absorption

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Co/CoO/Lotus Seedpod Nanoporous Carbon Composites Reduced from Co₃O₄ for High-Performance Microwave Absorbers

Sea‐Urchin‐MnO₂ for Broadband Optical Modulator