Bioinspired
Peptide Nanostructures for Organic Field-Effect
Transistors
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Abstract
Peptide-based
nanostructures derived from natural amino acids are
superior building blocks for biocompatible devices as they can be
used in a bottom-up process without the need for expensive lithography.
A dense nanostructured network of l,l<i>-</i>diphenylalanine (FF) was synthesized using the solid–vapor-phase
technique. Formation of the nanostructures and structure–phase
relationship were investigated by electron microscopy and Raman scattering.
Thin films of l,l-diphenylalanine micro/nanostructures
(FF-MNSs) were used as the dielectric layer in pentacene-based field-effect
transistors (FETs) and metal–insulator–semiconductor
diodes both in bottom-gate and in top-gate structures. Bias stress
studies show that FF-MNS-based pentacene FETs are more resistant to
degradation than pentacene FETs using FF thin film (without any nanostructures)
as the dielectric layer when both are subjected to sustained electric
fields. Furthermore, it is demonstrated that the FF-MNSs can be functionalized
for detection of enzyme–analyte interactions. This work opens
up a novel and facile route toward scalable organic electronics using
peptide nanostructures as scaffolding and as a platform for biosensing