Anisotropic conductivity in polyaniline and image processing applications

We present methods for obtaining anisotropic conductivity in polyaniline (PANI) thin films. The anisotropy in the conductivity comes from locally altering the form of the PANI through chemical means, converting the conducting salt form of PANI to one of its insulating forms. Measured perpendicular to parallel resistivity ratios are in excess of 103–104. By performing this conversion on a two-dimensional pixilated array, we are able to demonstrate basic directional spatial frequency filtering. This is the first demonstration of the Linear Low Pass spatial frequency filter (LLP).