Abstract
Laser-evaporated poly(vinyl fluoride) films were prepared with a view to their use as pyroelectric sensing elements. A high power (60 W) CO 2 laser was employed to prepare these films (0.1–1 microm thick) in a vacuum of better than 1 × 10 −5Torr. The films were characterized by determining their structure and molecular weight using IR spectroscopy and mass spectrometry. The pyroelectric currents developed in these films by poling them in electric fields of strength (1–5) × 10 5 V cm −1 and at poling temperatures of 303–450 K were measured. Various metal electrodes were used and the effect of the electrode material on the pyroelectric activity was also studied. The results are used to interpret the origin of the pyroelectricity in these films. The experimental details of the preparation of the films, their characterization and the pyroelectric current measurements are discussed.
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