Abstract
Diamond has excellent surface chemical properties for sensing applications but active device fabrication technology is immature compared to silicon. A method for attaching nanodiamonds to commercially available silicon ion-sensitive field effect transistors is demonstrated, leading to a nanodiamond-silicon hybrid sensor. In response to pH changes, the hybrid device showed a similar response to the Si sensor, at 55 mV/pH, near the Nernst limit. Complete immersion in liquid containing different molarities of explosive precursors such NaNO2 and NaClO3, and exposure to 2,4 dinitrotoluene vapor, an analog for the explosive trinitrotoluene, gave rise to sensitive detection, while the Si ion sensitive field effect transistor device remained insensitive.
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