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Graphene vs. silica coated refractory nitrides based core-shell nanoparticles for nanoplasmonic sensing
Alok Singh1, Manmohan Singh Shishodia1
1Department of Applied Physics, Gautam Buddha University, Greater Noida, 201312, India.
Physica. E, Low-Dimensional Systems & Nanostructures
|August 25, 2020
Summary
Graphene-coated refractory nitride core-shell nanoparticles show promise as ultrasensitive refractive index sensors. These advanced plasmonic nanoparticles offer enhanced sensitivity and figure of merit for biosensing applications.
Area of Science:
- Nanotechnology
- Materials Science
- Biosensing
Background:
- Conventional plasmonic nanoparticles (gold, silver) are widely used in biosensors.
- Core-shell nanoparticles (CSNP) offer tunable localized surface plasmon resonances (LSPR) and field enhancement.
- Refractory nitrides (ZrN, TiN) possess advantageous properties like tuneability, high melting point, and biocompatibility.
Purpose of the Study:
- To assess the feasibility of graphene-coated refractory nitride-based CSNP as efficient refractive index sensors.
- To compare the sensing characteristics of graphene-coated sensors with silica-based sensors.
Main Methods:
- Theoretical analysis and simulation using Mie theory.
- Validation of simulation results using COMSOL software.
Main Results:
- Graphene-coated refractory nitride CSNP demonstrate high sensitivity (171.68 nm/RIU) and figure of merit (3.57 × 10^4 nm/RIU).
- Comparison highlights superior plasmonic properties and sensing characteristics compared to silica-based sensors.
Conclusions:
- Graphene-coated refractory nitride core-shell structures show potential for developing ultrasensitive biosensors.
- These structures offer a promising platform for advanced refractive index sensing applications.
