Carbon-based foams with a three-dimensional structure can serve as a lightweight template for the rational design and control-lable preparation of metal oxide/carbon-based composite microwave absorption materials.In t...Carbon-based foams with a three-dimensional structure can serve as a lightweight template for the rational design and control-lable preparation of metal oxide/carbon-based composite microwave absorption materials.In this study,a flake-like nickel cobaltate/re-duced graphene oxide/melamine-derived carbon foam(FNC/RGO/MDCF)was successfully fabricated through a combination of solvo-thermal treatment and high-temperature pyrolysis.Results indicated that RGO was evenly distributed in the MDCF skeleton,providing ef-fective support for the load growth of FNC on its surface.Sample S3,the FNC/RGO/MDCF composite prepared by solvothermal method for 16 h,exhibited a minimum reflection loss(RL_(min))of-66.44 dB at a thickness of 2.29 mm.When the thickness was reduced to 1.50 mm,the optimal effective absorption bandwidth was 3.84 GHz.Analysis of the absorption mechanism of FNC/RGO/MDCF revealed that its excellent absorption performance was primarily attributed to the combined effects of conduction loss,multiple reflection,scattering,in-terface polarization,and dipole polarization.展开更多
This paper reports that bunchy flake-like nano-graphite crystallite films （BNGCFs） were deposited on Si substrates by using the microwave chemical vapour deposition technique. Furthermore the BNGCFs were characteriz...This paper reports that bunchy flake-like nano-graphite crystallite films （BNGCFs） were deposited on Si substrates by using the microwave chemical vapour deposition technique. Furthermore the BNGCFs were characterized by x-ray diffraction spectra, scanning electron microscopy, Raman spectra and field emission （FE） I-V measurements, and a lowest turn-on field of 1.5 V/μm, and a high average emission current density of 30 mA/cm2 at a macroscopic electric field of 8.0V/μm were obtained. The J-E data did not follow the original Fowler-Nordheim （F-N） relation since they were not well represented in the F-N plot by a straight line. A model considering the F-N mechanism, and the statistic effects of FE tip structures has been applied successfully to explain all the FE data observed for E 〈 8.SV/μm.展开更多
The rectangular flake-like mesoporous NiCo_2O_4（meso-NiCo_2O_4） catalysts were first used in glucose bio-sensing and glucose biofuel cell（GBFC） as an enzyme mimic simultaneously. The meso-NiCo_2O_4 displayed excel...The rectangular flake-like mesoporous NiCo_2O_4（meso-NiCo_2O_4） catalysts were first used in glucose bio-sensing and glucose biofuel cell（GBFC） as an enzyme mimic simultaneously. The meso-NiCo_2O_4 displayed excellent catalytic capability to glucose including a super-fast response time（within1 s）, a super-high sensitivity（662.31 μA（mmol L^（-1））^（-1）cm^（-2））,and a super-low detection limit（0.3 nmol L^（-1）at S/N = 3） on the sensor. On the other hand, meso-Ni Co_2O_4 provided great values in GBFC as anode material with an open circuit voltage of0.63 V, a maximum power density of 0.092 m W cm^（-2）, and a limiting current density of 1.3 m A cm^（-2）, respectively. The preeminent catalytic abilities may be attributed to the large specific surface area resulting from the mesoporous structure and the surpassing intrinsic catalytic activity of Ni Co_2O_4 itself.These significant findings may promote the development of the supersensitive detection of glucose and will undoubtedly widen the catalytic materials for biofuel cell electrodes.展开更多
基金support of the Key Science Research Project in Colleges and Universities of Anhui Province,China(No.2022AH050813)the Medical Special Cultivation Project of Anhui University of Science and Technology,China(No.YZ2023H2A002).
文摘Carbon-based foams with a three-dimensional structure can serve as a lightweight template for the rational design and control-lable preparation of metal oxide/carbon-based composite microwave absorption materials.In this study,a flake-like nickel cobaltate/re-duced graphene oxide/melamine-derived carbon foam(FNC/RGO/MDCF)was successfully fabricated through a combination of solvo-thermal treatment and high-temperature pyrolysis.Results indicated that RGO was evenly distributed in the MDCF skeleton,providing ef-fective support for the load growth of FNC on its surface.Sample S3,the FNC/RGO/MDCF composite prepared by solvothermal method for 16 h,exhibited a minimum reflection loss(RL_(min))of-66.44 dB at a thickness of 2.29 mm.When the thickness was reduced to 1.50 mm,the optimal effective absorption bandwidth was 3.84 GHz.Analysis of the absorption mechanism of FNC/RGO/MDCF revealed that its excellent absorption performance was primarily attributed to the combined effects of conduction loss,multiple reflection,scattering,in-terface polarization,and dipole polarization.
基金supported by the Shanghai Education Committee of China(Grant No 07ZZ95)
文摘This paper reports that bunchy flake-like nano-graphite crystallite films （BNGCFs） were deposited on Si substrates by using the microwave chemical vapour deposition technique. Furthermore the BNGCFs were characterized by x-ray diffraction spectra, scanning electron microscopy, Raman spectra and field emission （FE） I-V measurements, and a lowest turn-on field of 1.5 V/μm, and a high average emission current density of 30 mA/cm2 at a macroscopic electric field of 8.0V/μm were obtained. The J-E data did not follow the original Fowler-Nordheim （F-N） relation since they were not well represented in the F-N plot by a straight line. A model considering the F-N mechanism, and the statistic effects of FE tip structures has been applied successfully to explain all the FE data observed for E 〈 8.SV/μm.
基金supported by the National Natural Science Foundation of China (21671132 and 81301345)Shanghai Natural Science Foundation (14ZR1450000)support from Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University
文摘The rectangular flake-like mesoporous NiCo_2O_4（meso-NiCo_2O_4） catalysts were first used in glucose bio-sensing and glucose biofuel cell（GBFC） as an enzyme mimic simultaneously. The meso-NiCo_2O_4 displayed excellent catalytic capability to glucose including a super-fast response time（within1 s）, a super-high sensitivity（662.31 μA（mmol L^（-1））^（-1）cm^（-2））,and a super-low detection limit（0.3 nmol L^（-1）at S/N = 3） on the sensor. On the other hand, meso-Ni Co_2O_4 provided great values in GBFC as anode material with an open circuit voltage of0.63 V, a maximum power density of 0.092 m W cm^（-2）, and a limiting current density of 1.3 m A cm^（-2）, respectively. The preeminent catalytic abilities may be attributed to the large specific surface area resulting from the mesoporous structure and the surpassing intrinsic catalytic activity of Ni Co_2O_4 itself.These significant findings may promote the development of the supersensitive detection of glucose and will undoubtedly widen the catalytic materials for biofuel cell electrodes.
