期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 114, 期 2, 页码 515-520出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-013-7998-3
关键词
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资金
- European Union
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Lady Davis Fellowship Trust (LDFT)
We report a process for preparing polymer ferroelectrets by means of screen printing-a technology that is widely used for the two-dimensional patterning of printed layers. In order to produce polymer-film systems with cavities that are suitable for bipolar electric charging, a screen-printing paste is deposited through a screen with a pre-designed pattern onto the surface of a polymer electret film. Another such polymer film is placed on top of the printed pattern, and well-defined cavities are formed in-between. During heating and curing, the polymer films are tightly bonded to the patterned paste layer so that a stable three-layer system is obtained. In the present work, polycarbonate (PC) films have been employed as electret layers. Screen printing, curing and charging led to PC ferroelectret systems with a piezoelectric d (33) coefficient of about 28 pC/N that is stable up to 100 C-a similar to. Due to the rather soft patterned layer, d (33) strongly decreases already for static pressures of tens of kPa. The results demonstrate the suitability of screen printing for the preparation of ferroelectret systems.
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