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Keywords
- field-effect sensor (2)
- gold nanoparticles (2)
- Capacitive field-effect sensor (1)
- Capacitive model (1)
- Enzyme coverage (1)
- Field-effect biosensor (1)
- Gold nanoparticles (1)
- Label-free detection (1)
- Multianalyte detection (1)
- Multicell (1)
- Multiplexing (1)
- Penicillin (1)
- aminooctanethiol (1)
- capacitive EIS sensor (1)
- capacitive model (1)
- detection of charged macromolecules (1)
- electrolyte-insulator-semiconductor capacitors (1)
- nanoparticle coverage (1)
- polystyrene sulfonate (1)
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.