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HRTEM images of gold nanoparticles held together and nanowelded by irradiating laser pulses of and for on a carbon-coated copper TEM grid, indicating that gold nanoparticles are welded in a single phase to have ohmic nanocontact.
(Color) EDX line-intensity profiles scanned along the axis (a), the waist (b), and the shoulder (c) of two gold nanoparticles welded at the same conditions of Fig. 1, indicating that two particles are well contacted to produce ohmic contact.
TEM images of gold nanoparticles irradiated with laser pulses of 0.2 (a), (b) and (c) for . The nanoparticles were irradiated right after (a), (c) and a day after (b) applying aqueous gold colloids on carbon-coated copper TEM grids. The comparison of (a) and (b) suggests that laser irradiation, especially on the wet grid, induces the association of gold nanoparticles to be held closely during welding. On the other hand, the comparison of (a) and (c) indicates that the control of irradiation power is very critical to achieve optimal nanowelding.
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