THE RESPONSE MECHANISM OF AMINOTRI-TERT-BUTYLPHTHALOCYANINE THIN-FILMS TO NITROGEN-DIOXIDE

Asymmetrical phthalocyanines are seldom applied to gas sensor field be cause of its difficulties in synthesis, but asymmetrical phthalocyanin es possess donor or acceptor substituents in its peripheral ring, thus have many advantages over symmetrical phthalocyanines. Aminotri-tert- butylphthalocyanine (AmBuPc) is a new asymmetrical phthalocyanines, wh ich possesses three tertbutyl groups and one amino group that both are electron-donating substituents; this paper reports its vacuum evapora ted thin films gas sensitivity in 4.1 x 10(-5) kg/m(3) nitrogen dioxid e environment. The gas sensor appears good gas sensitivity to nitrogen dioxide and a linear relationship between log (resistance) and log (N O, concentration) was observed. A possible interaction mechanism betwe en NO2 and AmBuPc was reported using UV-Vis, IR, SEM and XPS. (C) 1998 Elsevier Science S.A. All rights reserved.