High dielectric constant, flexible and easy-processable calcium copper titanate/thermoplastic polyurethane (CCTO/TPU) composites through simple casting method

Abstract

In the past few years, there has been a significant demand for the development of high dielectric constant polymer composites for flexible electronic applications. However, the development of these flexible and stretchable dielectrics through simple and economical processing methods still remains challenging. In the present work, we have addressed this problem by developing high dielectric constant, flexible, calcium copper titanate (CCTO)/ thermoplastic polyurethane (TPU) composites through a simple and cost-effective casting method. At room temperature, 40 vol% CCTO/TPU composite exhibited a dielectric constant of 56 (1 kHz) along with an elongation at break of 202%, making it a promising dielectric material for flexible electronics. To our knowledge this is the best among the reported works in ceramic/ polyurethane composites, exhibiting a remarkable combination of high dielectric constant, excellent elongation at break and good mechanical strength. A prototype embedded capacitor was fabricated on copper cladded printed circuit board (PCB) by spin coating and a specific capacitance of 1.05 nF/cm2 was achieved at 1 kHz.

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Acknowledgements

The authors gratefully acknowledge Department of Science and Technology (DST, WOS-A, SR/WOS-A/ET-42/2016), Government of India for the financial support.

Funding

This work is part of a WOS-A project (Ref. No.: SR/WOSA/ET-42/2016) funded by the Department of Science and Technology (DST), Government of India.

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Correspondence to Seema Ansari.

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Variar, L., Muralidharan, M.N., Narayanankutty, S.K. et al. High dielectric constant, flexible and easy-processable calcium copper titanate/thermoplastic polyurethane (CCTO/TPU) composites through simple casting method. J Mater Sci: Mater Electron (2021). https://doi.org/10.1007/s10854-021-05311-z

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