1. Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA
2. Chemical Engineering Department, The University of Technology, PO Box 35010, Baghdad, Iraq
3. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
4. Sensors Directorate, Air Force Research Laboratory, WPAFB, Ohio 45433, USA
5. Semiconductor Research Center, Wright State University, Dayton, Ohio 45435, USA