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. Author manuscript; available in PMC: 2011 Feb 10.
Published in final edited form as: Nano Lett. 2010 Feb 10;10(2):547. doi: 10.1021/nl9034219

Figure 4.

Figure 4

Greatly Improved PSA detection limit of NW FET sensor in the subthreshold regime (a)-(b) Conductance sensing of 15 pM and 0.75 pM PSA samples by a p-type NW FET sensor at linear regime (Vg = 0 V). The curves show a minimal PSA detection limit ∼ 0.75 pM for this device in the linear regime. (c)-(f) Conductance sensing of 15 pM, 0.75 pM, 37 fM and 1.5 fM PSA samples with device in the subthreshold regime (Vg = 0.45 V). It can be clearly seen that the minimal PSA detection limit is improved to ∼1.5 fM in the subthreshold regime of this device.