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. Author manuscript; available in PMC: 2017 Dec 11.
Published in final edited form as: J Mater Chem C Mater. 2015 Apr 27;3(25):6445–6470. doi: 10.1039/C5TC00755K

Fig. 22.

Fig. 22

(a) Schematic illustration of an NTFET coated with a biotinylated polymer layer for specific streptavidin binding. (b) Biotinylation reaction of the polymer layer (poly(ethylene imine)/poly(ethylene glycol) (PEI/PEG)) on the sidewall of the SWNT. (c) Atomic force microscopy image of the polymer-coated and biotinylated NTFET device after exposure to streptavidin labeled with gold nanoparticles (10 nm in diameter). (d) The source–drain current dependence on the gate voltage of the NTFET device based on SWNT functionalized with biotin in the absence and presence of streptavidin. DMF: dimethylformamide. RT: room temperature. Copyright Advanced Materials, Wiley.41