Defect density modulation in graphene quantum dots towards high magnetic resonance relaxivity

Key Points

• The study aims to explore how defect density in graphene quantum dots affects magnetic resonance relaxivity due to changes in coordinated water molecules around Gd3+.
• Examined defect density in graphene quantum dots.
• Applied the Solomon-Bloembergen-Morgan theory for analysis.
• Measured magnetic resonance relaxivity using various concentrations of Gd3+.
• Higher defect density leads to increased magnetic resonance relaxivity.
• Optimized coordination of water molecules enhances the interactions with Gd3+.
• Demonstrated a correlation between defect density and relaxivity improvement.