Enhanced dielectric and electrical performance of phosphonic acid-modified tantalum (Ta)-doped potassium sodium niobate (KNaNbO3)-P(VDF-HFP) composites

Debajani Tripathy; Subhendu Chakroborty; Ankita Subhrasmita Gadtya; Ram Naresh Mahaling; Srikanta Moharana; Arundhati Barik; Kaushik Pal

doi:10.1140/epje/s10189-023-00279-6

2022 Impact factor 1.8

Soft Matter and Biological Physics

Novel Molecular Materials and Devices from Functional Soft Matter

Eur. Phys. J. E (2023) 46: 21
https://doi.org/10.1140/epje/s10189-023-00279-6

Regular Article - Soft Matter

Enhanced dielectric and electrical performance of phosphonic acid-modified tantalum (Ta)-doped potassium sodium niobate (KNaNbO₃)-P(VDF-HFP) composites

Debajani Tripathy¹, Subhendu Chakroborty²^b, Ankita Subhrasmita Gadtya¹, Ram Naresh Mahaling³, Srikanta Moharana¹^e, Arundhati Barik⁴ and Kaushik Pal⁵^g

¹ School of Applied Sciences, Centurion University of Technology and Management, Paralakhemundi, Odisha, India
² Department of Basic Sciences, IITM, IES University, Bhopal, MP, India
³ Laboratory of Polymeric and Materials Chemistry, School of Chemistry, Sambalpur University, Jyoti Vihar, 768019, Burla, India
⁴ Rama Devi Women’s University, 751007, Bhubaneswar, Odisha, India
⁵ University Centre for Research and Development (UCRD), Department of Physics, Chandigarh University, Mohali, Gharuan, Punjab, India

^b subhendu.cy@gmail.com
^e srikantanit@gmail.com
^g kaushikphysics@gmail.com

Received: 21 January 2023
Accepted: 6 March 2023
Published online: 27 March 2023

Abstract

PA-KNNT-P(VDF-HFP) composite films were synthesized using facile solution casting technique. Due to their wide range of applications in dielectric and electrical systems, phosphonic acid (PA)-modified tantalum-doped potassium sodium niobate (KNNT)–polyvinylidene fluoride co-hexafluoropropylene P(VDF-HFP) composite films have piqued the interest of academic researchers. Microstructural analysis showed that PA layers incorporated onto the KNNT particles within the polymer matrix. The PA-KNNT-P(VDF-HFP) composite exhibited improved dielectric and electrical performance over a broad range of frequency, and the value of the dielectric constant of the P(VDF-HFP) composites is improved by ≈119 over the P(VDF-HFP) matrix at a filler loading 19 wt.%. Moreover, PA-KNNT-P(VDF-HFP) composite also reveals higher dielectric constant (≈ 119) and AC conductivity than P(VDF-HFP)-KNNT composites, while maintaining suppressed dielectric loss ( at 10² Hz). It is also observed that the PA-KNNT-P(VDF-HFP) composite exhibited an insulator–conductor transition with a percolation threshold of f_KNNT = 13.4 wt.%. As a result of their exceptional dielectric and electrical characteristics, PA-KNNT-P(VDF-HFP) composites have the potential to find exciting practical applications in a variety of electronic domains.

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