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  • Title: A novel method for the functionalization of gamma-irradiated single wall carbon nanotubes with DNA.
    Author: Jovanović SP, Marković ZM, Kleut DN, Romcević NZ, Trajković VS, Dramićanin MD, Todorović Marković BM.
    Journal: Nanotechnology; 2009 Nov 04; 20(44):445602. PubMed ID: 19801777.
    Abstract:
    In this work we describe a novel method for highly efficient functionalization of single wall carbon nanotubes (SWCNTs) by DNA wrapping. Exposure of SWCNTs to gamma-irradiation (50 kGy) has lowered by one order of magnitude the amount of single stranded deoxyribonucleic acid (ssDNA) required for SWCNT modification. The resulting hybrids of gamma-irradiated SWCNTs and ssDNA were characterized by optical absorbance spectroscopy, Raman spectroscopy and Fourier transform infrared spectroscopy. Atomic force microscopy was used to investigate the morphology of hybrids. While gamma-irradiation in three different media has significantly improved the process of SWCNT dispersion, irradiation in ammonia was the most efficient. The gamma-irradiated SWCNTs functionalized with ssDNA were stabilized by electrostatic forces. This preliminary study suggests that gamma-irradiation can significantly improve the functionalization of SWCNTs with DNA.
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