1：Experimental Design and Method Selection

The study involved the preparation of RGO/NBR composites with different reduction times of RGO (3, 5, and 7 hours) to investigate their electromagnetic wave absorption properties in the 26.5–40 GHz frequency range.

2：Sample Selection and Data Sources

Samples were prepared using reduced graphene oxide (RGO) with different reduction times and nitrile rubber (NBR) as the matrix. The electromagnetic parameters were measured using a vector network analyzer.

3：List of Experimental Equipment and Materials

Graphite oxide (GO), acrylonitrile–butadiene rubber (NBR3365), dicumyl peroxide (DCP), hydrazine hydrate, dimethyl formamide (DMF), Fourier transform infrared (FT-IR) spectrometer, Raman spectrometer, X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field-emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), transition electron microscopy (TEM), vector network analyzer (PNA-N5244A), UT-2080 instrument for stress-strain behaviors.

4：Experimental Procedures and Operational Workflow

RGO was prepared by reducing GO with hydrazine hydrate at 90°C for different times. RGO/NBR composites were prepared by solution blending, followed by vulcanization. The composites were characterized for their structure, electromagnetic parameters, and mechanical properties.

5：Data Analysis Methods

The electromagnetic parameters were used to calculate the reflection loss (RL) using a specific equation. The mechanical properties were analyzed based on stress-strain behaviors.