Presentation Information
[21a-B205-4]Bonding conditions of Cu2O nanospheres on substrates by irradiating near-infrared femtosecond laser pulses
〇(B)Ohsuke Mizutani1, Duc Thuan Tran1, Kien Trung Vu Nguyen1, Mizue Mizoshiri1 (1.Nagaoka Univ of Tech)
Keywords:
Cu2O nanospheres,Femtosecond laser direct writing,single-layered bonding
Cu2O nanospheres are bonded on Cu thin-film substrates by irradiating femtosecond laser pulses. We investigated the bonding states such as single-layered or multi- and melted nanospheres by changing the intensity of the irradiated laser pulses. First, monodispersed Cu2O nanospheres with diameters of ~110 nm were mixed with reducing agents of 2-propanol and polyvinylpyrrolidone, and spin-coated on the Cu thin-film substrates. Then, near-infrared femtosecond laser pulses were focused and irradiated to the ink film by changing the pulse energy and the position of the focal spot. The threshold of the pulse intensity for the single-layered bonding was 108.5 GW/cm2. Cu2O nanospheres were melted by irradiating the pulses with the intensity of 143 GW/cm2. Any bonding was not occurred at the pulse intensity of 95.2 GW/cm2. The bonding states of Cu2O nanospheres were strongly affected by the irradiated pulse intensity.