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The recent nuclear crisis at Fukushima, Japan is a stark reminder that radiation emergencies can and do happen. In addition to accidents, the potential use of radioactive materials by terrorists has raised serious concerns. While the primary concern has been with preventing these materials from entering the United States, thousands of dangerous radiological sources are already here within our borders,...
Ion-sensitive field-effect transistors (ISFETs) have been fabricated using low-pressure chemical-vapor-deposited (LPCVD) silicon nitride on top of silicon dioxide as a double gate dielectric. The double dielectric layer provides improved ion blocking for the gate dielectric in solution with enhanced pH sensitivity over time. Three different storage conditions were tested using the sensor at room temperature:...
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