Dr. Gadi Slor Profile

Dr. Gadi Slor

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Proceedings Article | 2 March 2022 Presentation

Dendron-polymer hybrids as tailorable coronae of single-walled carbon nanotubes

Verena Wulf, Parul Rathee, Gadi Slor, Roey J. Amir, Gili Bisker

Proceedings Volume PC11972, PC1197214 (2022) https://doi.org/10.1117/12.2608179

KEYWORDS: Single walled carbon nanotubes, Polymers, Luminescence, Composites, Sensors, Optical sensing, Molecular interactions, Modulation, Image sensors, Biomedical optics

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Functional composite materials that can change their spectral properties in response to external stimuli have a plethora of applications in fields ranging from sensors to biomedical imaging. One of the most promising types of materials used to design spectrally active composites are fluorescent single-walled carbon nanotubes (SWCNTs), non-covalently functionalized by synthetic amphiphilic polymers. These coated SWCNTS can exhibit modulations in their fluorescence spectra in response to their interaction with target analytes. Hence, identifying new amphiphiles with interchangeable building blocks that can form unique coronae around the SWCNT, tailored for a specific application is of great interest. This study presents highly modular amphiphilic polymer-dendron hybrids, composed of hydrophobic dendrons and hydrophilic polyethylene glycol (PEG) that can be synthesized with high degree of structural freedom, for suspending SWCNTs in aqueous solution. Taking advantage of the high molecular precision of these PEG-dendrons, we show that precise differences in the chemical structure of the hydrophobic end-groups of the dendrons can be used to control the interactions of the amphiphiles with the SWCNT-surface. These interactions can be directly related to differences in the intrinsic near-infrared fluorescence emission of the various chiralities in a SWCNT sample. Utilizing the susceptibility of the PEG-dendron towards enzymatic degradation, we demonstrate the ability to monitor enzymatic activity by changes in the SWCNT fluorescent signal. These findings open new avenues for a rational design of SWCNT functionalization, and optical sensing of enzymatic activity in the near infra-red spectral range.

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