Helical Polycarbodiimide Cloaking of Carbon Nanotubes Enables Inter-Nanotube Exciton Energy Transfer Modulation

The use of single-walled carbon nanotubes (SWCNTs) as near-infrared optical probes and sensors require the ability to simultaneously modulate nanotube fluorescence and functionally derivatize the nanotube surface using noncovalent methods. We synthesized a small library of polycarbodiimides to nonco...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2014-11, Vol.136 (44), p.15545-15550
Main Authors: Budhathoki-Uprety, Januka, Jena, Prakrit V, Roxbury, Daniel, Heller, Daniel A
Format: Article
Language:English
Subjects:
aqueous solutions
Carbodiimides - chemistry
carbon nanotubes
coatings
Energy Transfer
Excitation
Fluorescence
Helical
Modulation
Nanostructure
Nanotubes, Carbon
optical properties
photoluminescence
Polycarbodiimides
polymers
Self assembly
Single wall carbon nanotubes
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Summary:The use of single-walled carbon nanotubes (SWCNTs) as near-infrared optical probes and sensors require the ability to simultaneously modulate nanotube fluorescence and functionally derivatize the nanotube surface using noncovalent methods. We synthesized a small library of polycarbodiimides to noncovalently encapsulate SWCNTs with a diverse set of functional coatings, enabling their suspension in aqueous solution. These polymers, known to adopt helical conformations, exhibited ordered surface coverage on the nanotubes and allowed systematic modulation of nanotube optical properties, producing up to 12-fold differences in photoluminescence efficiency. Polymer cloaking of the fluorescent nanotubes facilitated the first instance of controllable and reversible internanotube exciton energy transfer, allowing kinetic measurements of dynamic self-assembly and disassembly.
ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/ja505529n