| Microfabricated Electrochemical And Biochemical Sensors For Toxic Gases | ||
| Ilwhan Oh1, Chelsea N. Monty2, Mark A. Shannon3 and Rich I. Masel2, (1)Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 294 RAL, MC-712, 600 S. Mathews Ave., Urbana, IL 61801, (2)Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 294 RAL, MC-712, 600 S. Mathews Ave., Urbana, IL 61801, (3)Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 294 RAL, MC-712, 600 S. Mathews Ave., Urbana, IL 61801 There are strong demands for chemical sensors for gaseous toxic chemicals such as organophosphate and explosives. One of the approaches for high-selectivity sensor is to utilize a specific chemical or biological interaction of the target molecule. Recently we showed that the electrochemical sensor based on oxime chemistry provides high selectivity toward organophosphate. A novel type of gas sensor is fabricated by combining microfabrication techniques and electrochemical transducer. The microchannel sensor we built is composed of liquid/gas microchannels separated by a nanoporous membrane. When oxime chemistry is adapted into the microchannel sensor, it gives electrochemical potential response to trace vapor (10 ppb) of gas molecules within ~10 sec. Double microchannel design further reduces potential drift and simplifies the sensor setup. Extended Abstract Status: Not Uploaded | ||