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Click-Functionalization of Silanized Carbon Nanotubes: From Inorganic Heterostructures to Biosensing Nanohybrids
Gririraj Manoharan1,2, Petra Bösel1, Jannis Thien1
1Department of Physics, University of Osnabrück, 49076 Osnabrück, Germany.
Molecules (Basel, Switzerland)
|March 11, 2023
Summary
This study introduces a method to modify single-walled carbon nanotubes (SWNTs) using click chemistry, enabling the creation of advanced nanohybrids for sensing and nanoelectronics. This functionalization allows for precise assembly of inorganic and biological components.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Single-walled carbon nanotubes (SWNTs) offer unique electronic and mechanical properties.
- Developing versatile functionalization methods for SWNTs is crucial for advanced applications.
- Existing methods may lack efficiency or specificity for complex nanohybrid assembly.
Purpose of the Study:
- To present a novel approach for functionalizing SWNTs using copper-free click chemistry.
- To enable the assembly of diverse inorganic and biological nanohybrids.
- To demonstrate the utility of functionalized SWNTs in sensing and nanoelectronic devices.
Main Methods:
- Silanization of SWNTs followed by strain-promoted azide-alkyne cycloaddition (SPACC) reactions.
- Characterization using X-ray photoelectron spectroscopy, electron microscopy (SEM, TEM), Raman, and FTIR spectroscopy.
- Immobilization of functionalized SWNTs onto substrates via dielectrophoresis (DEP).
Main Results:
- Successful functionalization of SWNTs with azide groups was confirmed.
- Demonstrated assembly of nanohybrids with gold nanoparticles, fluorescent dyes, and aptamers.
- Real-time dopamine detection using SWNT-aptamer conjugates with high sensitivity.
- Selective functionalization of individual SWNTs on silicon substrates.
Conclusions:
- The developed method provides a robust route for SWNT functionalization and nanohybrid assembly.
- This strategy is applicable to a wide range of inorganic and biological moieties.
- The functionalized SWNTs show promise for sensitive biosensing and future nanoelectronic applications.
