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This invention has a resistance of around 40 ohms that detects gaseous HCl, NH3, NO, and organic materials at concentrations of 10-100 ppm.
About
Technology Three researchers from the School of Physics, James Gole, Peter Hesketh, and Lenward Seals, at the Georgia Institute of Technology have explored the use of porous silicon (PS) for sensor applications. The use of which in the past, in sensory applications, has been limited due to the fact that manufacture of such sensors has not been very successful. Through their research, a method to fabricate a PS-based, conductometric gas sensor has been discovered. This invention has a resistance of around 40 ohms that detects gaseous HCl, NH3, NO, and organic materials at concentrations of 10-100 ppm. It has a low energy cost as it operates in a 1-10 mV range (around the voltage of an average watch battery). Furthermore, it exhibits a rapid and reversible response to analyte gas at room temperature; it takes around a minute to respond and less than a minute to recover. Benefits · Detects gaseous HCl, NH3, NO, and organic materials at concentrations of 10-100 ppm · 20-100 ohm contact resistance · Low energy costs (1-10 mV) · Low fabrication cost · Rapid response (about a minute) · Rapid recovery (less than a minute) · Can be integrated into arrays Applications · Chemical Sensor · Biomedical Sensor · Environmental Sensor · Biosensor