Anisotropic conductivity in polyaniline and image processing applications

We present methods for obtaining anisotropic conductivity in polyaniline (P ANI) thin films. The anisotropy in the conductivity comes from locally alte ring the form of the PANI through chemical means, converting the conducting salt form of PANI to one of its insulating forms. Measured perpendicular t o parallel resistivity ratios are in excess of 10(3)-10(4). By performing t his conversion on a two-dimensional pixilated array, we are able to demonst rate basic directional spatial frequency filtering. This is the first demon stration of the Linear Low Pass spatial frequency filter (LLP). (C) 2000 El sevier Science S.A. All rights reserved.