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Summary

This study introduces a covalent method for functionalizing single-wall carbon nanotubes (SWCNTs) using diazonium chemistry. This stable approach preserves near-infrared fluorescence for advanced bio-applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Bioconjugation Chemistry

Background:

  • Single-wall carbon nanotubes (SWCNTs) are crucial for applications like sensing and drug delivery.
  • Noncovalent modification of SWCNTs preserves fluorescence but lacks stability in biological environments.
  • Stable covalent linkage is needed for demanding SWCNT applications.

Purpose of the Study:

  • To develop a stable, covalent functionalization method for SWCNTs.
  • To introduce sp3 quantum defects as conjugation handles.
  • To preserve SWCNT near-infrared fluorescence during functionalization.

Main Methods:

  • Utilized diazonium salt chemistry to create sp3 quantum defects on SWCNTs.
  • Developed a protocol for SWCNT dispersion and defect incorporation.
  • Established bioconjugation techniques, including in situ peptide synthesis.

Main Results:

  • Achieved stable, covalent functionalization of SWCNTs.
  • Successfully conjugated biomolecules (peptides, proteins) to SWCNTs.
  • Preserved the intrinsic near-infrared fluorescence of SWCNTs.

Conclusions:

  • Diazonium chemistry provides a versatile and scalable route for SWCNT functionalization.
  • The developed protocol yields stable, near-infrared fluorescent SWCNT bioconjugates.
  • This method enhances SWCNT suitability for advanced biological and sensing applications.