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Hybrid nano-composites made of ss-DNA/wrapped carbon nanotubes and titania.
Colloids and Surfaces. B, Biointerfaces 2017 April 2
Multi-walled carbon nanotubes, MWCNTs, are stabilized thanks to the surface wrapping of single-strand DNA, ss-DNA; the resulting adducts are kinetically and thermodynamically stable Such entities build up nano-hybrids with titania, TiO2, nano-particles, in presence of surfactant as an adjuvant. The conditions leading to TiO2 adsorption onto ss-DNA/CNTs were investigated, by optimizing the concentration of adducts, nano-particles (NPs), and of the cationic surfactant (CTAB). Controlling the working conditions makes possible to get homogeneously organized hybrids. Characterization by DLS, electro-phoretic mobility, SEM and AFM clarified the surfactant-assisted association modes between adducts and CTAB-functionalized TiO2. Nano-particles' clustering onto DNA-wrapped adducts gives hybrids trough electrostatic interactions. Surface coverage by TiO2 is significant and homogeneous. It is expected that the reported hybrids can be useful for applications in heterogeneous catalysis.
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