Nanosecond laser ablation of polyvinylpyrrolidone (PVP) protected silver nanoparticle (20 nm diameter) film is studied using a frequency doubled Nd:YAG nanosecond laser (532 nm wavelength, 6 ns full width half maximum pulse width). In the sintered silver nanoparticle film, absorbed light energy conducts well through the sintered porous structure, resulting in ablation craters of a porous dome shape or crown shape depending on the irradiation fluence due to the sudden vaporization of the PVP. In the unsintered silver nanoparticle film, the ablation crater with a clean edge profile is formed and many coalesced nanoparticles of 50 to 100 nm in size are observed inside the ablation crater. These results and an order of magnitude analysis indicate that the absorbed thermal energy is confined within the nanoparticles, causing melting of nanoparticles and their coalescence to larger agglomerates, which are removed following melting and subsequent partial vaporization.
Ablation of metal nanoparticle film using frequency doubled Nd:YAG nanosecond laser is explored to apply for
trimming drop on demand (DOD) inkjet printed electrical micro-conductor for flexible electronics. While elevated rim
structure due to expulsion of molten pool is observed in sintered nanoparticle film, the ablation of unsintered
nanoparticle film results in a Gaussian-shaped ablation profile, so that a clean precise patterning is possible. In addition,
the ablation fluence threshold of unsintered metal nanoparticle film is at least ten times lower than that of a
corresponding metal film. Therefore, by using nanosecond laser ablation, inkjet printed metal nanoparticles compatible
for flexible polymer can be patterned efficiently with a high resolution.
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