An AC and phase nanowire sensing for site-binding detection

Nanowire and nanoribbon sensing is mostly performed by quasi-static measurements (DC) that are unable to detect the time-dependent behavior of charges and their displacement at the interface. In this paper we propose a technique and a model for sensing nanowires in sinusoidal regimes (AC) that is able to capture both magnitude and phase information of the device response. The approach combines the advantages of impedance spectroscopy with the noise reduction performances of lock-in techniques. Experimental results using an integrated circuit (IC) interface reveal how different surface functionalizations give the same DC output but can be discriminated using the AC approach.