Silicon-Doped Graphene Oxide Quantum Dots as Efficient Nanoconjugates for Multifunctional Nanocomposites

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Graphene oxide quantum dots (GOQDs) are promising nanomaterials with tunable photoluminescence, stability, and biocompatibility.
• Engineering the interface of GOQDs is crucial for enhancing their performance in various applications.

Purpose of the Study:

• To develop a facile strategy for covalent silicon doping of GOQDs.
• To investigate the structural, optical, and mechanical properties of silicon-doped GOQDs (Si-GOQDs).
• To explore the application of Si-GOQDs in enhancing the properties of nanocomposite films.

Main Methods:

• One-pot covalent doping of GOQDs with silicon.
• Structural and morphological characterization using advanced microscopy techniques.
• Infrared nanoimaging and nanoindentation for property analysis.
• Co-assembly of Si-GOQDs with poly(dimethylsiloxane) (PDMS) for film fabrication.

Main Results:

• Successful covalent attachment of silicon to GOQD edges, forming Si-GOQDs with an average size of ~8 nm.
• Si-GOQDs exhibit tailored photoluminescence emissions and distinct domains with enhanced near-field responses.
• Si-GOQD/PDMS nanocomposite films show nearly twofold reduced water permeability compared to single-layered films.
• Si-GOQD-coated substrates demonstrate enhanced softness and deformability.

Conclusions:

• Covalent silicon doping is an effective strategy for engineering GOQD interfaces.
• Si-GOQDs offer improved dispersibility and performance in nanocomposite materials.
• Nanoscale surface engineering of GOQDs is vital for developing advanced functional films.