What question did this study set out to answer?

To synthesize a bifunctional linker for functionalizing carbon nanotubes with azido and diazonium groups.

June 3, 2026Chemistry - A European Journal0 citationsOpen Access

Successive Azide and DNA Functionalization for Reversible and Controlled Association of Single‐Wall Carbon Nanotubes

RMRazieh MoosaviUniversity of Turku TKTharun K. KotammagariUniversity of Turku PDPia DamlinUniversity of Turku

Key Points

To synthesize a bifunctional linker for functionalizing carbon nanotubes with azido and diazonium groups.
Synthesized a bifunctional linker with azido and diazonium groups.
Functionalized single-wall carbon nanotubes with 6-carboxyfluorescein and oligonucleotides.
Utilized copper-free strain-promoted azide-alkyne cycloaddition for further functionalization.
Demonstrated successful introduction of azido groups on carbon nanotubes.
Showed reversible bundling-debundling of nanotubes as indicated by UV melting profiles.
AFM images confirmed hybridization-controlled behavior of functionalized nanotube mixtures.

Abstract

ABSTRACT A bifunctional linker for robust and straightforward functionalization of carbon‐based nanomaterials, featuring an azido group at one end and a diazonium group at the other, is synthesized and used to introduce azido groups on the sidewalls of (6,5)‐single‐wall carbon nanotubes. The versatility of the azido groups as reactive handles is demonstrated by further functionalization with 6‐carboxyfluorescein and oligonucleotides through copper‐free strain‐promoted azide—alkyne cycloaddition, ideal for biological applications. UV melting profiles and atomic force microscopy (AFM) images of mixtures of nanotubes functionalized with complementary oligonucleotide strands are consistent with hybridization‐controlled bundling—debundling equilibria.

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