Universitiy of Potsdam

Applied Condensed Matter Physics

Prof. Dr. Reimund Gerhard
2016-11-04 16:30 by Manuel Schulze

Pyroelectricity - what is it?

Polymers - such as Polyvinylidenefluoride (PVDF) - consist of long chains of molecules, as is shown in the image below.


Certain molecular groups act as dipoles and can be oriented in an electric field.


When the poled polymer is exposed to heat, the sample expands, causing the dipole spacing to change. This leads to a change in surface charge which can be measured with a sensitive amplifier.