An impedance match method used to tune the electromagnetic wave absorption properties of hierarchical ZnO assembled by porous nanosheets
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Bibliographic record
Abstract
In this study, three hierarchical porous ZnO flowers were prepared via calcination of the precursor at different temperatures (400 °C, 500 °C and 600 °C). It can be found that the calcination temperature influences the porous structure and size of the ZnO nanoparticles. The porous structure can effectively tune the permittivity to improve the impedance match. The porous ZnO flowers obtained at 400 °C show a large surface area and small size of ZnO nanoparticles and thus, hold good impedance match. Moreover, the porous ZnO flowers self-assembled by nanosheets can induce multiple reflection and scattering, which prolong the microwave travel path and consume more electromagnetic energy. Therefore, the porous ZnO flowers obtained at 400 °C exhibit outstanding microwave absorption properties. The minimal reflection loss is −46.1 dB at 13.6 GHz with only a thickness of 1.9 mm. The absorption bandwidth of RL less than −10 dB can reach up to 11.5 GHz (6.5–18.0 GHz) by adjusting the absorber thickness (1.5–4.0 mm). The lightweight, small thickness, and strong and tunable absorbing properties of the porous ZnO flowers make it attractive for developing a high-performance electromagnetic wave absorber.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it