LANGMUIR-SCHAEFER FILMS OF A POLY(O-ANISIDINE) CONDUCTING POLYMER FORSENSORS AND DISPLAYS

Langmuir-Schaefer (LS) films of poly(o-anisidine) (POAS) were fabricat ed and characterized by means of Brewster-angle microscopy, ellipsomet ry and electrochemical techniques. The studied optical, cyclic voltamm etric and ellipsometric properties of films underlined a regular depos ition up to at least 40 monolayers of POAS conducting polymer. The dev elopment of surface irregularities beyond 40 monolayers in LS films sh owed an electrochemical kinetic similar to electrodeposited films. Mor e importantly, the electrochemical kinetic in a small number of monola yers was indicative of the fast transfer process of the electrons. The nature of anions caused meaningful changes in the redox properties of POAS LS films. The electrochromic switching response lime and diffusi on coefficient of the LS films were estimated through electrochemical surveying. Later, POAS LS films were used as a sensing element for a s urvey of 0.1 ppm of acid in water through conductimetric measurement.