Effects of Heat Treatment on the Electromagnetic Wave Absorption Characteristics of Resorcinol Formaldehyde Silicon Dioxide Ceramic Particles

• Published in: Materials Vol. 17; no. 10; p. 2376
• Main Authors: Zhang, Haiyang, Ye, Xinli, Xu, Jianqing, Li, Shan, Ma, Xiaomin, Xu, Wei, Zhang, Junxiong
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.05.2024
• Subjects: Absorption; Aluminum; Atmospheric pressure; Bandwidths; Ceramics; Composite materials; Dielectric properties; Dielectrics; Electric waves; Electrical conductivity; Electromagnetic radiation; electromagnetic wave absorbing; Electromagnetic waves; Electromagnetism; Formaldehyde; Frequency ranges; Heat treatment; Impedance matching; Nanowires; Optimization; Outdoor air quality; Radio frequency; Room temperature; Silica; Silicon; Silicon dioxide; SiO2 ceramic particles; Sol-gel processes; sol–gel method; Temperature; X ray photoelectron spectroscopy; China; United States > US; SiO2 ceramic particles; electromagnetic wave absorbing; sol–gel method
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma17102376

In light of the pressing environmental and health issues stemming from electromagnetic pollution, advanced electromagnetic wave absorbing materials are urgently sought to solve these problems. The present study delved into the fabrication of the resorcinol formaldehyde (RF)/SiO ceramic particles using the sol-gel route. From SEM images and XRD and XPS analysis, it can be seen that the RF/SiO ceramic particles are successfully generated after heat treatment at 1500 °C. At room temperature, the sample treated at 1500 °C exhibited a minimum reflection loss of -47.6 dB in the range of 2-18 GHz when the matching thickness was 5.5 mm, showcasing strong attenuation capabilities. Moreover, these particles demonstrated a considerable effective electromagnetic wave absorption bandwidth of 3.14 GHz, evidencing their potential for wideband electromagnetic wave absorption. The temperature adjustment played a pivotal role in achieving optimal impedance matching. When the heat treatment temperature is increased from 800 °C to 1500 °C, the dielectric properties of the material are improved, thus achieving the best impedance matching, thereby optimizing the material's absorption properties for specific frequency ranges, which makes it possible to customize the electromagnetic wave-absorbing characteristics to meet specific requirements across a range of applications.