Tunable fluorescence enhancement based on bandgap-adjustable 3D Fe3O4 nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Spectroscopy

Background:

• Solid-state substrates for fluorescence detection have advanced, but achieving tunable enhancement factors remains challenging.
• Existing methods often rely on metal particles, limiting substrate versatility.

Purpose of the Study:

• To develop novel liquid fluorescence-enhanced substrates with tunable enhancement factors.
• To demonstrate the use of 3D photonic crystals formed by Fe3O4 nanoparticles for fluorescence enhancement.

Main Methods:

• Suspensions of Fe3O4 nanoparticles (NPs) were utilized to form 3D photonic crystals under an external magnetic field.
• The photonic bandgap effect, arising from magnetic and electrostatic forces between NPs, was employed to enhance fluorescence.
• Various dye molecules (R6G, RB, Cy5, DMTPS-DCV) were tested for fluorescence enhancement.

Main Results:

• A maximum 12.3-fold fluorescence enhancement was achieved using the 3D Fe3O4 NP substrates.
• The enhancement was demonstrated without the need for metal particles.
• The fluorescence enhancement was shown to be reversible and controllable.

Conclusions:

• Liquid Fe3O4 NP-based substrates offer a promising platform for tunable and controllable fluorescence enhancement.
• This approach provides a metal-free alternative for developing advanced fluorescence detection systems.