Room temperature curable zirconium silicate dielectric ink for electronic applications

Abstract

A facile formulation of room temperature curable and screen printable zirconium silicate (ZrSiO₄) ink has been developed. The ZrSiO₄ ink printed on the flexible BoPET (biaxially-oriented polyethylene terephthalate) substrate showed a surface roughness of ∼160 nm for a printed layer thickness of 25 μm. The screen printed ZrSiO₄ layer on the BoPET substrate has a relative permittivity of 3.01 and a dielectric loss of 0.0058 at 10 GHz. It showed a temperature coefficient of relative permittivity of 55 ppm per °C in the temperature range of 25–60 °C at 15 GHz. The room temperature curability, low dielectric loss, low relative permittivity, mechanical and temperature stability of microwave dielectric properties of the printed ZrSiO₄ layer make it suitable for printed microwave applications.