Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Final Dissertation.pdf (5.67 MB)

ETD Abstract Container

Abstract Header

Electroactive Polymer Films in Chemical Analysis

Young, Joshua A
http://orcid.org/0000-0003-3981-3220
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431622300

Abstract Details

2015, Doctor of Philosophy, University of Toledo, Chemistry.
Electroactive polymers composed from pyrroles, thiophenes, anilines, and their various derivatives have demonstrated interesting electrochemical and structural properties, which have led to their integration into a number of electronic devices and sensors. Interest in these inherently conductive polymers has not waned since their discovery and new applications are continuously being pursued. In the spirit of these innovations, the use of these polymers as thin film chemically modified electrodes (CMEs) is further expanded herein. A modified glassy carbon (GCE) electrode was developed for the amperometric detection of biogenic amines, particularly histamine. The electrode was modified with the coenzyme pyrroloquinoline quinone (PQQ) by entrapment during electropolymerization of pyrrole to form polypyrrole (PPy). This method formed a thin film on the electrode surface possessing very good stability with a shelf-life exceeding one month without loss of signal. Optimal conditions for the PQQ/PPy electrode were determined and a linear response was found for histamine in phosphate buffer (pH = 6) at +550 mV from 40 to 160 mgL-1 with a limit of detection (S/N = 3) of 38 mgL-1. The practical linear range offered by this method suggests ideal use for spoilage detection in fermented foods. Novel applications for conductive polymer films were also explored. Three thiophene-functionalized imidazolium ionic liquids were prepared in order to form conductive polymeric ionic liquid (CPIL) films onto the surface of conventional electrodes as well as platinum fibers. The ionic liquids differed in the functionalization of the imidazole head with a methyl, vinyl, or benzyl moiety. Thermogravimetric analysis demonstrated thermal stability of the monomer up to 370 ºC, while electrochemical properties of the CPILs show selective rejection of cationic species in solution. Further, electrochemical impedance spectroscopy (EIS) of the films show the methyl ionic liquid to be the most conductive of the three. Platinum fibers were coated with the methyl CPIL and applied to the solid-phase microextraction (SPME) and analysis of various polar analytes. The results demonstrate excellent fiber-to-fiber reproducibility and, when normalized to the film thickness, comparable extraction efficiency to commercial polyacrylate fibers. In addition to conductive polymers as an immobilization matrix for PQQ, other methods of modifying electrode surfaces with o-quinones was also explored. These preliminary studies focused on the formation of self-assembled monolayers (SAMs) onto gold surfaces using either thiol functionalized o-quinone capped molecular wires or by forming a PQQ-SAM onto the surface via cystamine linker. The results thus far have provided useful insight into efficacy of these methods as well as future directions which may prove fruitful.
Jon Kirchhoff, Ph.D. (Advisor)
Jared Anderson, Ph.D. (Committee Member)
Dragan Isailovic, Ph.D. (Committee Member)
Viranga Tillekeratne, D.Phil. (Committee Member)
163 p.
Analytical Chemistry; Chemistry

Recommended Citations

Citations

  • Young, J. A. (2015). Electroactive Polymer Films in Chemical Analysis [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431622300

    APA Style (7th edition)

  • Young, Joshua. Electroactive Polymer Films in Chemical Analysis. 2015. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431622300.

    MLA Style (8th edition)

  • Young, Joshua. "Electroactive Polymer Films in Chemical Analysis." Doctoral dissertation, University of Toledo, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431622300

    Chicago Manual of Style (17th edition)

toledo1431622300
412
© 2015, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.