Rapid functionalization of single-walled carbon nanotubes in polar solvents
Researchers discovered that using polar solvents in the modification of single-walled carbon nanotubes enhances their optical properties, enabling the detection of cholesterol.
Single-walled carbon nanotubes (SWCNTs) are promising materials for photonics applications due to their fluorescent semiconducting properties. Enhancing these optical characteristics through functionalization introduces additional spectral features. The role of the solvent in SWCNT modification, however, has not been thoroughly examined. This study investigates the interactions between solvents, dispersants, and SWCNTs to understand the underlying mechanisms. A systematic analysis of SWCNT reactivity across various solvents, supported by multiscale modeling using a hybrid functional within SIESTA, reveals that both the solvent medium and dispersant influence the kinetics and progression of SWCNT modification. Polar solvents, in particular, cause significant structural changes in polymers on the SWCNT surface and improve charge redistribution at the polymer-SWCNT interface. This allows for controlled optical properties of SWCNTs, facilitating the optical detection of cholesterol, a known risk factor for cardiovascular diseases.
Source: Carbon Nanotubes Feed