Journal
COMPOSITES PART B-ENGINEERING
Volume 70, Issue -, Pages 201-205Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2014.11.017
Keywords
Polymer-matrix composites (PMCs); Electrical properties; Electron microscopy; Cure; Screen-printing
Funding
- Tekes [906/31/2010]
- Jozef Stefan Institute (Slovenia)
- ITME (Poland)
- Sachtleben Pigments Oy (Finland)
- Pulse Finland Oy (Finland)
- NOF Corporation (Japan)
- Riitta ja Jorma J. Takanen foundation
- Infotech Oulu Doctoral Program
- KAUTE
- Tauno Tonning
- Wihuri foundations
- Academy of Finland [267573]
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In this research a composite for printable capacitors using screen printed structures and low temperature curing ferroelectric ink was investigated. The realized ink consisted of 40 vol% barium titanate in a poly(vinylidenefluoride-trifluoroethylene) matrix. DuPont silver ink 5064H was used for the conductive lines in the design and the maximum process temperature was 130 degrees C. The thickness of the composite and the area of the printed capacitor were 43 mu m and area 25 mm(2), respectively. The obtained relative permittivity of the composite was 46 and the tan delta was 0.15 at 1 MHz. Additionally, the microstructure of the composite was investigated and the temperature dependence of the dielectric properties measured. The capacitance of the parallel plate structure was approximately 200 pF at 1 MHz. This is easily adjustable by changing the printing pattern, number of layers or the filler loading. The freedom of choice in integration and capacitance value selection makes the ink highly usable in, for example, decoupling capacitors that are compatible with inorganic, organic and even flexible, substrates. (C) 2014 Elsevier Ltd. All rights reserved.
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