. . . . . . . . . .    ANM 2010     3rd International Conference on Advanced Nano Materials     12-15 September 2010 - Agadir, Morocco Back    Abstract ANMM163 CHARACTERIZATION OF CARBON NANOTUBES SYNTHESIZED BY CHEMICAL VAPOR DEPOSITION Miaoxiang Chen (1), Peter Boggild (1), Jörg P. Kutter (1), Klaus B. Mogensen (1), Paulo Freitas (2) and José Rivas (2) (1) Department of Micro- and Nanotechnology, Technical University of Denmark, Denmark (2) International Iberian Nanotechnology Laboratory, 4710-229 Braga, Portugal . Carbon nanotubes (CNTs), including metallic and semiconducting tubes, have high chemical stability, outstanding electrical and thermal conductivities, and mechanical strength. Unzipping CNTs will allow the production of graphene nanoribbons with controlled electrical conductivity, placement and alignment in a scalable fashion for device integration. These merits make them exceptional candidates for developing novel devices with functionality and efficiency that are orders-of-magnitude better than state-of-the-art technologies. While CNTs can usually be synthesized by laser ablation of carbon rods, direct current arc-discharge between electrodes and chemical vapor deposition (CVD), the CVD technique appears to be the method of choice for production of high-quality CNTs on specific positions. The CNTs studied in this work were directly grown on Si/SiO2 substrates by thermal CVD. In the process, acetylene (C2H2) was used as carbon source; either Al2O3-NiFe or Al2O3-Ni was employed as catalyst. The pyrolysis of C2H2 and metal-catalyst was performed in an N2/H2 environment at relatively low temperature inside the CVD reactor. The effects of growth conditions on the qualities of CNTs were intensively investigated for growing high-quality CNTs. Various measurement techniques, SEM, TEM and Raman, were employed to characterize the as-grown CNTs, exhibiting the nanotubes were homogeneous with controllable diameters ranging between 3 and 100 nm and free of amorphous carbon. The CNTs were further integrated with microfluidic device for biochemical analysis by directly growing CNTs on an electrically insulated SiO2-channel. The microfluidic device was used for chromatographic separations of organic compounds, such as proteins. The molecules were pumped through the channels by means of electroosmosis and interact with the hydrophobic CNTs to different degrees, which led them have different flow velocities in the channels, and was used to physically separate the different organic components in the samples. . © nanoAC . . . . . . . . . .

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