Red Emitting Solid-State CDs/PVP with Hydrophobicity for Latent Fingerprint Detection

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Fluorescent carbon dots (CDs) are novel photoluminescent nanomaterials.
• Solid-state CDs often suffer from fluorescence quenching due to π-π interactions and energy transfer.
• Developing solid-state, long-wavelength emitting CDs remains a challenge.

Purpose of the Study:

• To synthesize long-wavelength emitting, hydrophobic fluorescent carbon dots (CDs).
• To investigate the properties of solid-state CDs/Polyvinyl pyrrolidone (PVP) composites.
• To evaluate the application of these composites in latent fingerprint detection.

Main Methods:

• Solvothermal synthesis was employed to prepare fluorescent carbon dots.
• CDs were composited with Polyvinyl pyrrolidone (PVP) to form a solid-state powder.
• The photoluminescence properties and quantum yield (QY) of the CDs/PVP were characterized.

Main Results:

• Hydrophobic, long-wavelength emitting CDs were successfully synthesized.
• The CDs/PVP composite powder exhibited strong red fluorescence with a QY of 18.9%.
• The developed CDs/PVP powder effectively visualized latent fingerprints with high contrast and fine definition.

Conclusions:

• The study successfully prepared hydrophobic fluorescent carbon dots with long-wavelength emission.
• The CDs/PVP composite demonstrates significant potential for latent fingerprint detection applications.
• This research offers insights for designing novel hydrophobic carbon dots.