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Jiri JanataProfessor and Eminent Scholar in Sensors and Instrumentation Office: 1-24 Boggs Phone: 404-894-4828 Fax: 404-894-7452 NSF Workshop - The New Challenges of Chemical and Biological Sensing |
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
Research Interests
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 inherent stability of the silicon part of the transistor guarantees a stable reference potential required for this form of “gas phase potentiometric sensor”. 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.
Electrochemical DNA/RNA Hybridization Array. Our label-free hybridization assay is based on the principle of modulation of the negative charge density at the interface between conducting polymer (polypyrrole) and buffer solution. The modulation is achieved by selective binding of genomic DNA fragments to surface immobilized probe DNA oligomer. The change of charge density results in changes in the cyclic voltammogram due to partial rejection of the anions. Our overall goal is to construct a fully field-able diagnostic tool for detection of parasite born infectious diseases, such as malaria. This project is done in collaboration with Center for Disease Control and Prevention.
Magnetic Quartz Crystal Microbalance. When placed in a strong magnetic field (~ 1-3 Tesla) QCM coated with para or ferromagnetic materials exhibits major changes in its oscillatory behavior. This is a beginning of a new experimental concept which promises to lead to a new tool for investigation of magnetic materials.
Microirradiator. Microelectrodes (10-20 micron diameter) can be coated with radioactive isotopes and then serve as a source of highly localized radiation. Thus, Ni-63 (beta emitter, 67 keV max) has been used to create a collimated beam of beta radiation. The main goal is to create safe sources of very low absolute activity, but very high dose density. The Ni-63 has been used for radiobiological experiments at Medical College of Georgia and as ionization source for mass spectrometry of surface analysis.
Representative Publications
F. L’Hereec, Hang Chen, Zhipin Zhou and J. Janata, J.Phys.Chem.B. 108 (2004); 9042-9047 “New Platform for Testing Organic Field-Effect Transistors”
Guofeng Li, Carlos Martinez, Steve Semancik, J. Anthony Smith, Mira Josowicz and Jiri Janata, Electrochem.Solid State Lett. (2004), 7(10), H44-H47“The effect of morphology on the response of polyaniline based conductometric gas sensors: nanofibers vs. thin films”
Guofeng Li, Steve Semancik, Mira Josowicz and Jiri Janata, Appl.Phys.Lett., 85 (2004), 1187-1189, “The effect of thermal excitation on intermolecular charge transfer efficiency in conducting polyaniline”
Hang Chen, Mira Josowicz, Karin Potje-Kamloth and Jiri Janata, Chem. Materials, 16 (2004) 4728-4735, “Chemical Effects in Organic Electronics”
G. Moakes, Leslie T. Gelbaum Johannes Leisen and Jiri Janata, Farad. Disc. 129, (2005), 81-97, “NMR study of lithium ion in nitrobenzene/water system”
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”
J. A. Smith, M. Josowicz, and J. Janata, “Gold/Polyaniline Composite: Part I Moving Electrochemical Interface, Phys. Chem. Chem. Phys., 2005, 7, 3614 - 3618
J. Anthony Smith, M. Josowicz, J. Janata, Mark Engelhard and Don R. Baer “Gold/Polyaniline Composite: Part II Effect of Nanometer Size Clusters”, Phys. Chem. Chem. Phys., 2005, 7, 3619 - 3625
John Hartung, Janusz Kowalik, Christine Kranz, Jiri Janata, Mira Josowicz, Ashwini Sinha, Kendra McCoy..J. Electrochem.Soc., 152 (2005)E345-E350 "Electropolymerization of Bilayer with Phosphonic Acid Tethers for Immobilization of Biomolecules"
Jamie Summerour, Yanfeng Chen, Mira Josowicz, Thomas M. Orlando, Alena Paulenova and Jiri Janata,, “A Beta Microirradiator”, Radiation Physics and Chemistry 75 (2006) 369-374
Greg Moakes, Leslie T. Gelbaum, Johannes Leisen, Jiri Janata and Vladimir Marecek, “Solvation Dynamics Of Lithium Salts In Wet Nitrobenzene”, J. Electroanal.Chem. 593 (2006) 111-118
Amir Saheb, Jiri Janata and Mira Josowicz, Electroanalysis 18 (2006) 405-409 “Reference Electrode for Ionic Liquids”
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, Mira Josowicz and Jiri Janata, Electroanalysis 19 (2007) 37-42, “Study of Selective layer for HCN Sensing”
Greg Moakes, Leslie T. Gelbaum, Johannes Leisen, Jiri Janata , Vladimir Marecek and Luke L. Daemen, J.Phys.Chem B, 111 (2007) 7312-7317 “2D Nmr Studies Of Dynamics Of Lithium/Water/Nitrobenzene System”
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”
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”
G. Yu and J. Janata, Anal. Chem. 65 (2008) 2751, “Proximity Effect in QCM”
Wen Chen, Mira Josowicz, Bhaskar Datta, Gary B. Schuster, and Jiri Janata, “In situ electropolymerization of DNA-templated aniline assemblies on a gold surface”, Electrochem.Solid State Lett., 11 (2008) E11-E14
Amir Saheb, Mira Josowicz and Jiri Janata, Anal.Chem., 80 (2008) 4214-4219 “Chemically Sensitive Field-Effect Transistor with Polyaniline-Ionic Liquid Composite Gate”
Jiri Janata and Mira Josowicz, J.Solid State Electrochem. 13 (2009) 41-49, “Organic Semiconductors in Potentiometric Gas Sensors”
George Yu and Jiri Janata, J.Appl.Phys., 104 (2008) 043908 :Magnetic Quartz Crystal Microbalance: A Multi-layer Gold/Nickel Stack”
Amir Saheb, Mira Josowicz and Jiri Janata, Electroanalysis 21 (2009) 290-294, “Field-Effect Transistors with Mixed Ionic-Electronic Gate”
Jennifer Steeb, Mira Josowicz and Jiri Janata, Anal. Chem. 81 (2009) 1976-1981 , “Nickel-63 Microirradiator”
Ryan West, Mira Josowicz, Jiri Janata, Isabelle Mine and Laszlo Hevesi, J.Electrochem.Soc., 156 (2009) F55-F59, “Controlled Electropolymerization of 1-pyrrolyl-10-decanephosphonic acid: An Anion Barrier Layer