Professor and GRA Eminent Scholar in Sensors and Instrumentation
Office: 1-24 Boggs
M.Sc., The Charles University, Prague, 1961; Ph.D., The Charles University, Prague, 1965
Alexander von Humboldt Senior Scientist Prize 1987; Heyrovsky Medal, Czechoslovak Academy of Sciences, 1990; Recipient of Outstanding Achievement Award, Electrochemical Society; appointed as Georgia Research Alliance Eminent Scholar - 1996, elected Honorary member of the Czech Learned Society - 2001; Search for Electroactive Materials: 2003 Award; NSF Creativity Award, 2007
Chemical Electronics. Organic and inorganic materials can be used as active components in solid state electronic devices. The most obvious application are solid state chemical sensors such as Chemically Sensitive Field-Effect Transistors (CHEMFET). They represent a versatile platform for creating well-defined chemical sensors and chemical sensing arrays for many gas phase monitoring applications. CHEMFETs are hybrid structures containing conventional silicon-based part, which is combined with electroactive material forming the chemically responsive gate. The principal mode of interaction of these materials with gases and vapors involves modulation of work function of the gate material. The main research thrust in this area is on design of novel sensing materials for the FET platform and on creation of integrated, chemical sensing arrays. A field-effect transistor configuration also allows investigation of equilibrium fluctuation of work function of organic semiconductors used as the gate materials. There is no other experimental technique that would allow such investigation.
Magnetic Quartz Crystal Microbalance. When placed in a strong magnetic field (~ 1-3 Tesla) QCM coated with this layer of para or ferromagnetic materials exhibits major changes in its oscillatory behavior. They have been linked to changes of mechanical properties of the thin layer. This is a new experimental concept, which may lead to a new tool for investigation of thin magnetic films.
Atomic Metals and Alloys. Polyaniline is the most widely used organic semiconductor. Among its unique properties belong its ability to strongly bind various halo-complexes. We have exploited that ability to use it as an isolation matrix for electrochemical synthesis of atomic metals and atomic alloys. Thus, unprotected, but isolated clusters of AuN (N=0-7) have been prepared and their properties predicted by quantum theory have been confirmed. Likewise, atomic alloys containing AuNPdM have been prepared and tested. Other binary and ternary atomic alloys are being investigated.
Alex P. Jonke, Mira Josowicz and Jiri Janata, J. Electrochem.Soc.159 (2012) P40-P43, “Odd-Even Pattern Observed in Polyaniline/(Au0 – Au8) Composites”
Kevin C. Vavra, George Yu, Mira Josowicz and Jiri Janata, J. Appl. Phys. 110 (2011) 013905 “Magnetic Quartz Crystal Microbalance: Magnetoacoustic Parameters”
Josowicz, Mira; Kalantari, Roya; Cantor, Ryan; Chen, Hang; Yu, George; Janata, Jiri, Anal.Chem., 82 (2010) 9028-9033, “Label-free voltammetric detection method using individually addressable oligonucleotide microelectrode arrays"
Ryan West, Colby Watts, Mira Josowicz and Jiri Janata, Coll.Czech.Chem.Commun., 2011, 76, 843-858; doi:10.1135/cccc2011055, “Fluctuation Analysis of Work Function of Organic Semiconductors”
Alex Jonke, Mira Josowicz and Jiri Janata, J.Electrochem.Soc., 158(12), E147-E151 (2011) “Polyaniline doped with atomic gold
Alex Jonke, Mira Josowicz and Jiri Janata, J. Electrochem.Soc. 157 (2010) P83-87, Electrochemically Controlled Atom by Atom Deposition of Gold to Polyaniline
Jennifer Steeb, Mira Josowicz and Jiri Janata, Anal. Chem. 81 (2009) 1976-1981 , “Nickel-63 Microirradiator”
J. Janata, Principles of Chemical Sensors, 2nd Edition, Springer, 2009, New York
Jiri Janata, Coll.Czechoslov..Chem.Commun. 2009, 74, 1623–1634, Potentiometry in gas phase
Jiri Janata and Mira Josowicz, J.Solid State Electrochem. 13 (2009) 41-49, “Organic Semiconductors in Potentiometric Gas Sensors”
Amir Saheb, J. Anthony Smith, Mira Josowicz, Don R. Baer and Mark H. Engelhard, J. Electroanal. Chem. 621 (2008) 238-244 “Controlling Size Of Gold Clusters In Polyaniline From Top Down And From Bottom Up”
R. Cantor, H. Ishida and J. Janata, Anal. Chem. 80 (2008) 1012-1018, “Sensing Array for Coherence Analysis of Modulated Chemical Plume”
Amir Saheb, Mira Josowicz and Jiri Janata, Anal.Chem., 80 (2008) 4214-4219 “Chemically Sensitive Field-Effect Transistor with Polyaniline-Ionic Liquid Composite Gate”
George Yu and Jiri Janata, J.Appl.Phys., 104 (2008) 043908 :Magnetic Quartz Crystal Microbalance: A Multi-layer Gold/Nickel Stack”
Hang Chen, Arun Rambathla, Karin Potje-Kamloth and Jiri Janata, “Study Of Electric Field-Modulation In Organic Field-Effect Transistors”, J.Electrochem.Soc. 154 (2007) H453
Isao Sasaki, Jiri Janata and Mira Josowicz, Polymer Degradation and Stability 92 (2007) 1408, “Stabilization of electronic properties of (1R)-(-)-10-camphorsulfonic acid doped polyaniline by UV irradiation”
Greg Moakes and Jiri Janata, Accounts of Chem. Res. 40 (2007) 720-728, “Slow solvation dynamics of water/nitrobenzene system”
George Yu, Mira Josowicz, William Hunt and Jiri Janata, Rev. Sci. Instr. 78 (2007) 065111-1, “Magnetic Quartz Crystal Microbalance”
Temitope Aiyejorun, Janusz Kowalik, Jiri Janata and Mira Josowicz, J.Chem.Educ. 83 (2006) 1208-1211, “Label-Free Detection of DNA Hybridization by Cyclic Voltammetry”