title: Hybrid nano-composites made of ss-DNA/wrapped carbon nanotubes and titania.
abstract: 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 TiO2adsorption 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 TiO2is significant and homogeneous. It is expected that the reported hybrids can be useful for applications in heterogeneous catalysis.
authors.affiliation: Dept. of Chemistry, La Sapienza University, P.le A. Moro 5, 00185, Rome, Italy.
authors.forename: Martina
authors.initials: M
authors.lastname: Romio
authors.affiliation: Dept. of Chemistry, La Sapienza University, P.le A. Moro 5, 00185, Rome, Italy. Electronic address: camillo.lamesa@uniroma1.it.
authors.forename: Camillo La
authors.initials: C
authors.lastname: Mesa
mesh_terms: D004277:DNA, Single-Stranded / Q000737:chemistry* / Q000648:ultrastructure; D007700:Kinetics; D018625:Microscopy, Atomic Force; D064347:Microscopy, Electrochemical, Scanning; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D013501:Surface-Active Agents / Q000737:chemistry; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*
chemical_list: D004277:DNA, Single-Stranded; D037742:Nanotubes, Carbon; D013501:Surface-Active Agents; C009495:titanium dioxide; D014025:Titanium
keywords: DNA-MWCNT adducts; Multi-walled carbon nanotubes; Surfactant-assisted adsorption; Titania binding onto DNA-MWCNT adducts; Titania nano-particles; ss-DNA