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MOCSER current signal vs. time for a GaAs sensor coated with SAMs of varying thickness exposed to 10 ppm triacetone triperoxide. The signal is defined as the relative change in the current before and after exposure. The trends in the signal magnitude as a function of receptor thickness are highlighted by arrows. The SAM is adsorbed on GaAs via a (A) phosponate or (B) thiol group. The experiments are detailed in ref. 7.
