In Place of a Rejoinder: Embracing Factors A, B, C, and D

Hurd, Russell C.; Brown, Steven R.

doi:10.22488/okstate.04.100530

Cited by 1 publication

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“…Figure S5, Supplementary Information depicts the reaction process. [47] The temperature range between the two pyrolysis temperatures of 800 and 900 °C is home to another phenomenon that should not be disregarded. Due to the appearance of both Ni monomer and NiO phase compositions in the carbon nanosheets after pyrolysis at various temperatures (Figure S6, Supplementary Information), the content of C-O-C and O-C═O decreased after increasing to 900 °C.…”

Section: Analysis Of Polarization Loss Type and Mechanism Of Ultrathi...mentioning

confidence: 99%

Commonly Neglected Ester Groups Enhanced Microwave Absorption

Jin

Zhou

Tao

et al. 2023

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Oxygen‐containing functional groups have high potential to excite polarization loss. The nature and mechanism of the polarization loss brought on by oxygen‐containing functional groups, however, remain unclear. In this study, metal‐organic framework precursors are in situ pyrolyzed to produce ultrathin carbon nanosheets (UCS) that are abundant in oxygen functional groups. By altering the pyrolysis temperature, the type and concentration of functional groups are altered to produce good microwave absorption capabilities. It is demonstrated that the main processes of electromagnetic loss are polarization caused by “field effects and induced effects” brought on by strongly polar ester functional groups. Moreover, links between various oxygen functional groups and structural flaws are established, and their respective contributions to polarization are sharply separated. The sample with the highest ester group content ultimately achieves an effective absorption bandwidth of 6.47 GHz at a pyrolysis temperature of 800°C. This research fills a theoretical hole in the frequently overlooked polarization mechanism in the microwave band by defining the key polarization parameters in chaotic multiple dipole systems and, in particular, redefining the significance of ester groups.

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Section: Analysis Of Polarization Loss Type and Mechanism Of Ultrathi...mentioning

confidence: 99%