Modification of Rice Husk-based Activated Charcoal as Microwave Absorbing Material

Dinda Khoirun Nisa, Yayat Ruyat, Mas Ayu Elita Hafizah, Wahyu Widanarto

Abstract


Stealth technology is one of the technologies being developed to eliminate RADAR traces from the enemy. The spectrum used in this technology is in the microwave range (8-12 GHz). RAM (Radar Absorbing Material) is one of the techniques that can be used in the design of stealth technology. One material that has the potential to be used as RAM is activated charcoal as a dielectric material. In the manufacture of activated charcoal, a chemical activation method is used with an activator in the form of 5 M HCl to obtain good porosity properties in charcoal. Modification of active charcoal was also carried out using mechanical milling method with time variations of 50, 100, 150, and 200 minutes which were then characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS), and Vector Network Analyzer (VNA). Mechanical milling is proven to be able to change the shape of the charcoal structure from amorphous to semicrystalline with the crystalline phase formed in the form of C60-fullerene. Activated charcoal samples with a time variation of 100 minutes have the best absorbing ability with absorption reaching 78.22% and a reflection loss value of -25.96 dB at a frequency of 9.69 GHz with a frequency bandwidth of 3.68 GHz.

Keywords—stealth technology; rice husk activated charcoal; mechanical milling; microwave absorber.

 


Keywords


U1-900

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DOI: http://dx.doi.org/10.52155/ijpsat.v46.2.6525

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