Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 13, Pages 18246-18251Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.03.144
Keywords
Flexible electronics; High-frequency; PDMS matrix; Magnetic ferrite
Categories
Funding
- Key Research and Development Projects of Sichuan Science and Technology Plan [2021YFG0223]
- Project of Southwest University of Science and Technology [20zx7101]
- National Natural Science Foundation of China of China [61971094]
- Project of State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology [18fksy0209]
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By utilizing ultrasonic stirring and vacuum-pumping process, a series of xCo2Z/PDMS composite films were prepared in this study, with 4Co2Z/PDMS film showing improved magnetic-dielectric properties at 800 MHz and high saturation magnetization.SEM micrographs confirmed the well dispersion of micro-sized ferrite particles in PDMS matrix using ultrasonic stirring and fast curing, indicating a potential method to enhance high-frequency magnetic and dielectric properties of PDMS matrix for the development of high-frequency flexible electronics.
Improving magnetic-dielectric properties of polymer materials, through filler of functional ceramics, provides feasibility to develop high-frequency flexible electronics. Poly-dimethylsiloxane (PDMS), an inert silicone with low elasticity modulus and high transparency, has been considered a promising candidate for flexible electronics. Current PDMS matrix used in high-frequency devices suffers from unsatisfactory properties due to very low dielectric constant. In this study, using ultrasonic stirring and vacuum-pumping process, we prepare a series of xCo2Z/PDMS (x = 2; 4; 6; 8; 10) composite films, which are consisted of PDMS matrix and different quantity of micro-sized ferrite particles. XRD pattern indicates that the obtained ferrite particles include Co2Z main phase and BaM second phase. We demonstrate that 4Co2Z/PDMS film has improved magnetic-dielectric properties at 800 MHz (mu' = 1.49; epsilon' = 4.54 tan delta mu = 0.058; tan delta epsilon = 0.008). Also, the film has high saturation magnetization (sigma s = 17.51 emu/g). Furthermore, SEM micrographs show that using ultrasonic stirring and fast curing, the microsized ferrite particles are well dispersed in PDMS matrix. Our study, which provides a simple method to improve high-frequency magnetic and dielectric properties of PDMS matrix, could pave the way for development of highfrequency flexible electronics.
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