AVS 50th International Symposium
    Organic Films and Devices Tuesday Sessions
       Session OF-TuP

Paper OF-TuP9
Contour TPD of N,N'-disalicylidene-1,2-propanediamine Thin-films

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: C.C. Chusuei, University of Missouri-Rolla
Authors: C.C. Chusuei, University of Missouri-Rolla
J.A. Schreifels, George Mason University
Correspondent: Click to Email
A simple method for obtaining a comprehensive overview of large (m/e > 200) molecular weight compounds desorbing from the surface during temperature programmed desorption (TPD) experiments is presented. Standard 2D TPD methods require a priori knowledge of surface reactions and typically therefore is limited to a few pre-selected mass-to-charge ratios (< 10). Our method precludes this necessity since wide mass ranges (m/e = 25) can be monitored in a single experiment. Desorbing organic films can be represented in the form of contour TPD (CTPD) plots. In our example, the desorption of N, N'-disalicylidene-1,2-propane -diamine, an important jet fuel additive used in aircraft, is adsorbed onto oxidized and oxide-free 304 stainless steel surfaces. The utility of CTPD for providing mechanistic insight into thermal decomposition pathways is demonstrated. Four chemical species were observed at m/e = 107, 133, 232 and 290 respectively, and mechanistic pathways for their formation are presented. Conventional 2D TPD spectra can be extracted from the CTPD by taking vertical slices of the contours.