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Investigation of PTFE-based ultra-low dielectric constant composite substrates with hollow silica ceramics

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Abstract

Polytetrafluoroethylene was composited with low dielectric constant hollow SiO2 powders to obtain an ultra-low dielectric constant high-frequency microwave composite substrate. The analysis of XPS, contact angle testing, and SEM observation were conducted to study the surface characteristics of phenyltrimethoxysilane (Z6124)-modified hollow silica and 1 H,1 H,2 H,2 H-perfluorooctyltriethoxysilane (F8261)-modified hollow silica. The content of hollow silica ranged from 35 to 55 vol% and the effects of hollow silica filling content on water absorption, morphology, and dielectric properties were investigated in detail. The composite material with 45 vol% hollow SiO2 modified by 5 wt.% Z6124 performed excellent dielectric properties of ultra-low dielectric constant (1.94) and low dielectric loss (0.0019) at a high frequency of 10 GHz. Moreover, it also has acceptable water absorption (0.19%) and well coefficient of thermal expansion (CTE ~ 55.5 ppm/°C). The ultra-low dielectric constant composite is beneficial to improve signal transmission speed, which is potential for microwave substrates application.

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The data presented in this study are available on request from the corresponding author.

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Acknowledgements

The authors would like to thank Southwest University of Science and Technology (Mianyang, Sichuan, People’s Republic of China) for their assistance and support in material testing in this work.

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YW and YY participated in the conceptualization; Data curation: YW; Formal analysis: YW; Methodology: YW, ZY, HW, EL, and YY; Project administration: YY; Supervision: YY; Writing—original draft: YW and HW; Writing—review and editing: ZY and YY. All authors read and approved the final manuscript.

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Correspondence to Ying Yuan.

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Wang, Y., Yang, Z., Wang, H. et al. Investigation of PTFE-based ultra-low dielectric constant composite substrates with hollow silica ceramics. J Mater Sci: Mater Electron 33, 4550–4558 (2022). https://doi.org/10.1007/s10854-021-07646-z

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  • DOI: https://doi.org/10.1007/s10854-021-07646-z

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