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Preparation and Patterning of Nanoscale Wires:


Nanoscale wires are essential interconnects for future device technologies. At present we are investigating several wires systems: LiSe 3Mo 3, ErSi 2, carbon nanotubes and metallic wires synthesized by template methods. Each occurs as a single wire or as a bundle up to tens of nanometers in diameter. In the case of LiSe 3Mo 3 wires these bundles when released can extend to lengths of over 100 µm (more than 0.1 mm!).   For LiMo 3Se 3, three-dimensional nanowire networks are formed upon ion exchange of the Li-cation by positively charged organic ligands. We are interested in developing protocols for synthesizing these wires, as well as patterning and chemical modification for interconnect applications.

Picture: Ball and stick model of LiMO 3Se 3.

Ball and stick model of LiMo 3Se 3. (Blue: Lithium, grey: Molybdenum, orange: Selenium). The diameter of a single nanowire is 0.6 nm.

Picture: AFM image showing LiMo 3Se 3 nanowire

AFM image showing LiMo 3Se 3 nanowire forming a Y- and X-shaped contact.

Picture of more than 80 nanometre long LiMo 3Se 3 nanowire

More than 80 µm long LiMo 3Se 3 nanowire.

Picture: LiMo 3Se 3 nanowire network

LiMo 3Se 3 nanowire network on HOPG formed by spin-coating of a 10 -3 M DMSO solution at 5000 rpm. The nanowires have a very uniform diameter between 3 and 5 nm and the network is nearly two-dimensional.

Picture: LiMo 3Se 3 “neuronal” nanowire network

LiMo 3Se 3 “neuronal” nanowire network on HOPG.

Picture: TEM image of an ion exchange

TEM image of an ion exchange XMo 3Se 3 nanowire network.

TEM image of an ion exchange XMo 3Se 3 nanowire network

TEM image of an ion exchanged XMo 3Se 3 nanowire network. Clearly visible are the 0.6 nm diameter (Mo 3Se 3 -) n – chains separated by the positively charged X + - ligands. The spacing between the nanowire chains depends strongly on the size of the used ligands.

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Last Updated: June 21, 2005 .
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