Abstract
NiO nanoparticle solution film, which included NiO nanoparticles, ethylene glycol, and polyvinylpyrrolidone, was reduced to Ni to form Ni microstructures using femtosecond laser induced reduction. When the femtosecond laser pulses were focused onto the film and scanned, Ni microstructures were formed. The line width was uniform under the condition of low pulse energy and high scanning speed. This result indicates that the series of phenomena of NiO nanoparticle reduction, agglomeration, and sintering was completed by individual laser pulses. The lower scanning speed and higher scanning speed caused the re-oxidation of the microstructures and remained non-reduced NiO nanoparticles, respectively.
