Synthesis and Characterization of ZnO@SiO₂ Composite for Microwave Absorber Applications

Authors

  • Muhammad Fauzan Physics Study Program, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta, 13220, Indonesia Author
  • Aditia Nur Bakti Research Center for Testing Technology and Standards, National Research and Innovation Agency, Banten, 15314, Indonesia Author
  • Elvina Trivida Research Center for Testing Technology and Standards, National Research and Innovation Agency, Banten, 15314, Indonesia Author
  • Nova Nur Elisa Dewi Physics Study Program, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta, 13220, Indonesia Author
  • Djoko Triyono Physics Department, FMIPA, Universitas Indonesia, Kampus UI Depok, Depok, 16424, Indonesia Author
  • Iwan Sugihartono Physics Study Program, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta, 13220, Indonesia Author

DOI:

https://doi.org/10.35895/jpsi.1.2.116-122.2025

Keywords:

ZnO@SiO2, biosynthesis, moringa oleifera, microwave absorption

Abstract

This study aims to synthesize ZnO@SiO₂ composites via biosynthesis using Moringa oleifera leaf extract and to investigate the effect of different SiO₂ contents (pure ZnO, 1%, 3%, and 5% by weight) on their structural and microwave absorption properties, with ZnO prepared from a Zn(NO₃)₂·4H₂O precursor and calcined at 450 °C for 2 hours. The synthesized samples were characterized using X-ray Diffraction (XRD) and a Vector Network Analyzer (VNA). XRD results confirmed that all samples exhibited a hexagonal wurtzite crystal structure with space group P6₃mc and showed no secondary phases. The crystallite size decreased with increasing SiO₂ content, indicating nanoparticle formation and reduced crystallinity. VNA measurements showed that the ZnO@SiO₂ sample with 3% SiO₂ exhibited the best microwave absorption performance, with a minimum reflection loss (RL) value of –2.0251 dB at a frequency of 6.125 GHz. These results suggest that the 3% composition achieved better impedance matching and enhanced absorption efficiency.

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Published

2025-10-13

How to Cite

Synthesis and Characterization of ZnO@SiO₂ Composite for Microwave Absorber Applications. (2025). Journal of the Physical Society of Indonesia, 1(2), 116-122. https://doi.org/10.35895/jpsi.1.2.116-122.2025

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