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Schematic of a MIME sensor showing (a) the gold nanoclusters with adsorbed vapor, (b) the nanocluster film situated between electrodes, and (c) the interdigitated electrodes that form the completed device.
Current noise spectral density as a function of frequency with voltage as a parameter for a sensor having an gap. The compression at low voltages and the noise floor at higher frequencies are due to the measuring system noise.
Current noise spectral density as a function of the applied voltage for the sensor of Fig. 2.
The noise prefactor as function of device area including data from the present work and data from Ref. 4.
The estimated detection limit, in parts per billion by volume (ppbv), as a function of the ac voltage amplitude for three operating frequencies. The sensor has an gap, and clusters with 2 nm cores and octanethiol shells.
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