Tungsten/Platinum Hybrid Nanowire Growth via Field Emission Using Nanorobotic Manipulation
Figure 4
Images showing hybrid nanowire growth inside the FESEM chamber: (a) a 500 nA constant field emission current was applied for 1 min to grow the platinum nanowire; (b) the platinum nanowire grew 38 nm from the MWCNT tip; (c) a 1 μA constant current was again applied in which the platinum nanowire diameter increased from 28 to 40 nm; (d) a 1 μA constant current was applied for 2 minutes in which the platinum nanowire grew a further 101 nm; (e) the gap between the nanowire tip and tungsten probe was reset to 1.1 μm, and a 1 μA constant current was applied for 2 minutes causing the nanowire to grow a further 151 nm; (f) the gap was reset to 1.2 μm, and a 1 μA constant current was applied for 2 minutes causing the nanowire to grow a further 45 nm; (g) the gap was reset to 1.2 μm, and a 1 μA constant current was applied for 2 minutes causing a further 73 nm of growth; (h) the tungsten nanowire grew from the platinum nanowire tip. The CpPtMe3 precursor was changed to W(CO)6, and a 300 nA constant current was applied for 1 minute across a 1.1 μm gap.
