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Mira JosowiczPrincipal Research Scientist Office: Boggs Building Phone: 404-894-4032 Fax: 404-894-7452 |
B.S., Politechnika Slaska, Gliwice, Poland; Ph.D. Technical University Munich, Germany; Postdoctoral University of Utah, Salt Lake City; Research Scientist at University of Bundeswehr in Munich, Germany, Research Scientist at Pacific Northwest National Laboratory, Washington.
First prize of the Polish Undergraduate Research Project, Feodor-Lynnen-Humboldt Research Scholarship
Research Interests
Design of conducting polymers for solid-state applications. The general area of my research involves studies of electronic phenomena in conducting polymers where the electron motion is geometrically restricted by the structural arrangement of the polymer backbone. These studies are important for the solid-state applications such as potentiometric gas sensors, molecular electronics, supercapacitors or batteries. The idea to design conducting polymes in a controlled manner is challenging. It is important to be able to configure molecules in such a way that they could control chemical interactions of interest, and be manipulated through hydrogen bonding, electron donor/acceptor complex formation or short-range molecular recognition. The following approaches have been investigated so far: weak acid doping, controlled self-organization of the polymer, formation of metal-cluster/polymer composites and doping with the photochemically generated acid.
Characterization of conducting polymers and their composites. Characterizations of conducting polymers in scope of their doping with protons, anions or metal clusters can be conducted with the help of electrochemical and, spectroscopic techniques such as UV-vis, FTIR, ATR-FTIR, by photoacoustic spectroscopy or XPS, work function measurements with Kelvin Probe or with field efect transistor having as a gate the conducting polymer material. Electron transmission microscopye, differential scanning calorimetry and X-Ray diffraction techniques are also used. The goal is to learn about the origin of the physicochemical-changes in the polymer matrix by the guest molecules. The correlation between the changes in the polymer with the changes in its material properties allow us to study the parameters that govern the primary doping and later determine the interaction between the host matrix and the guest molecules.
Testing and calibration of conducting polymer layers towards their responses to gas analytes. The testing of the developed layers for gas sensor applications is conducted using gas mixing system that allows dilutions from 1:10 to 1:1000. The testing is conducted on layers deposited on Kelvin Probes specimens or on sensor array based on eight field effect transistors.
Representative Publications
"Development of quantitative method for volatile compounds in degraded engine oil", K. Sepcic, M. Josowicz, J. Janata, Tribology and Lubr. Technol., 2004, 40-47.
"The effect of thermal excitation on intermolecular charge transfer efficiency in conducting polyaniline," G. Li, S. Semancik, M. Josowicz, J. Janata, Appl. Phys. Lett., 2004, 85, 1187-1189.
"Polyaniline-gold nanocomposite system," J. Anthony Smith, Mira Josowicz, Jiri Janata, J. Electrochem. Soc., 2003, 150(8), E384-E388.
"Conducting polymers in electronic chemical sensors," Jiri Janata, Mira Josowicz, Nature Materials, 2003, 2(1), 19-24.
"Label-free DNA hybridization probe based on a conducting polymer," Liz A. Thompson, Janusz Kowalik, Mira Josowicz, Jiri Janata, J. Am. Chem. Soc., 2003, 125(2), 324-325.
"Role of protonic and charge transfer doping in solid-state polyaniline," Brian J. Polk, Karin Potje-Kamloth, Mira Josowicz, Jiri Janata, J. Phys. Chem. B, 2002, 106(44), 11457-11462.
"Doping of polyaniline in the solid state with photogenerated triflic acid," Karin Potje-Kamloth,; Brian J. Polk, Mira Josowicz, Jiri Janata, Chem. Mater., 2003, 14(6), 2782-2787.
"Electrochemical assembly of conducting polymer films on an insulating surface," Guofeng Li; Mira Josowicz, Jiri Janata, Electrochemical and Solid-State Letters, 2003, 5(4), D5-D8.
"Photochemical tuning of field-effect transistor with polyaniline gate conductor," Karin Potje-Kamloth, Brian J. Polk, Mira Josowicz, Jiri Janata, Advanced Materials (Weinheim, Germany), 2001, 13(23), 1797-1800.
"Electrochemical modulation of the electronic properties in conducting poly(phenylenesulfidephenyleneamine)," Guofeng Li; Mira Josowicz, Jiri Janata, Synthetic Metals, 2001, Volume Date 2002, 125(3), 273-278.
"Square-wave voltammetry of ClO4--doped poly(phenylenesulfidephenyleneamine)," Guofeng Li; Mira Josowicz, Jiri Janata, J. Electrochem. Soc., 2001, 148(5), E215-E218.
"Structural, electronic, and morphological changes in poly(phenylenesulfide phenyleneamine) upon electrochemical doping," Guofeng Li; Mira Josowicz, Jiri Janata, Klaus Muellen, J. Phys. Chem. B, 2001, 105(11), 2191-2196.
"Headspace analysis of engine oil by gas chromatography/mass spectrometry," Dianne M. Levermore, Mira Josowicz, William S. Rees Jr., Jiri Janata, Anal. Chem., 2001, 73(6), 1361-1365.
"Comparison of chemically and electrochemically synthesized polyaniline films," David W. Hatchett, Mira Josowicz, Jiri Janata, J. Electrochem. Soc., 1999, 146(12), 4535-4538.
"Electrochemical formation of Au clusters in polyaniline," David W. Hatchett, Mira Josowicz, Jiri Janata, Donald R. Baer, Chem. Mater., 1999, 11(10), 2989-2994.