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Selection and Functionalization of Germanium Nanowires for Bio-Sensing

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journal contribution
posted on 23.09.2022, 07:07 authored by Siriny Laumier, Thomas Farrow, Harm van Zalinge, Luca Seravalli, Matteo Bosi, Ian Sandall
In this paper, we investigate the use of dielectrophoresis to align germanium nanowire arrays to realize nanowire-based diodes and their subsequent use for bio-sensing. After establishing that dielectrophoresis is a controllable and repeatable fabrication method to create devices from germanium nanowires, we use the optimum process conditions to form a series of diodes. These are subsequently functionalized with an aptamer, which is able to bind specifically to the spike protein of SARS-Cov2 and investigated as a potential sensor. We observe a linear increase in the source to drain current as the concentration of spike protein is increased from 100 fM/L to 1 nM/L.