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In Situ Studies of Sensor Film Dynamics by Spectroscopic Ellipsometry

Zudans, Imants
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060895616

Abstract Details

2003, PhD, University of Cincinnati, Arts and Sciences : Chemistry.
This thesis describes ellipsometric studies of chemically selective films to characterize certain aspects of spectroelectrochemical sensors. For these intentions back-side ellipsometric configuration was adopted that enables in situ studies of coatings that contact solution. Two slightly different flow cells that enable such in situ interrogations were developed. The method was first demonstrated by acid etching of ITO film on glass substrate. Continuous and uniform film’s thickness decrease was observed in this process. A characterization procedure of ITO films on 1737 F glass substrate is outlined and optical constant determination of this material is presented. Several sensor film formulations were characterized too. A partition process of a chromophore (Ru(bpy) 32+) into polymer film (Nafion) was studied and it was determined how this film’s properties (optical constants and thickness) are affected by incorporation of the chromophore. Three modes of chromophore partitioning were modeled and ellipsometric data were used to distinguish between these three modes. As has been noted before, some film formulations require long equilibration with 0.1 M aqueous KNO3 solution for optimal performance. This observation suggested analysis of this equilibration process. Several different film dynamics in soaking solution were studied ellipsometricly. Film behavior ranged from no observable changes to eventual complete and irreversible collapse. Comparisons of experiments conducted ellipsometricly and electrochemically to elucidate this equilibration was presented.
Dr. Carl J. Seliskar (Advisor)
Dr. William R. Heineman (Other)
196 p.
Chemistry, Analytical
in situ; ellipsometry; films; dynamics; sensors

Recommended Citations

Citations

  • Zudans, I. (2003). In Situ Studies of Sensor Film Dynamics by Spectroscopic Ellipsometry [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060895616

    APA Style (7th edition)

  • Zudans, Imants. In Situ Studies of Sensor Film Dynamics by Spectroscopic Ellipsometry. 2003. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060895616.

    MLA Style (8th edition)

  • Zudans, Imants. "In Situ Studies of Sensor Film Dynamics by Spectroscopic Ellipsometry." Doctoral dissertation, University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060895616

    Chicago Manual of Style (17th edition)

ucin1060895616
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© 2003, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12