Field-Effect Capacitors Decorated with Ligand-Stabilized Gold Nanoparticles: Modeling and Experiments

  • Nanoparticles are recognized as highly attractive tunable materials for designing field-effect biosensors with enhanced performance. In this work, we present a theoretical model for electrolyte-insulator-semiconductor capacitors (EISCAP) decorated with ligand-stabilized charged gold nanoparticles. The charged AuNPs are taken into account as additional, nanometer-sized local gates. The capacitance-voltage (C–V) curves and constant-capacitance (ConCap) signals of the AuNP-decorated EISCAPs have been simulated. The impact of the AuNP coverage on the shift of the C–V curves and the ConCap signals was also studied experimentally on Al–p-Si–SiO₂ EISCAPs decorated with positively charged aminooctanethiol-capped AuNPs. In addition, the surface of the EISCAPs, modified with AuNPs, was characterized by scanning electron microscopy for different immobilization times of the nanoparticles.

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Author:Arshak Poghossian, Tobias KarschuckORCiD, Patrick Wagner, Michael J. SchöningORCiD
Parent Title (English):Biosensors
Place of publication:Basel
Document Type:Article
Year of Completion:2022
Date of first Publication:2022/05/13
Date of the Publication (Server):2023/01/25
Tag:aminooctanethiol; capacitive model; electrolyte-insulator-semiconductor capacitors; field-effect sensor; gold nanoparticles; nanoparticle coverage
Length:14 Seiten
This article belongs to the Special Issue "Biosensors in Nanotechnology"
Institutes:FH Aachen / INB - Institut für Nano- und Biotechnologien
collections:Open Access
Verlag / MDPI
Licence (German):License LogoCreative Commons - Namensnennung