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4 March 2019 Direct writing of Cu-based flexible thermal detectors using femtosecond laser-induced reduction
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Abstract
Cu-based thermal detectors were directly fabricated on poly(ethylene) naphthalate (PEN) films using femtosecond laserinduced reduction metal oxide nanoparticles. Both CuO and CuO/NiO mixed nanoparticle solution films on PEN films were reduced and sintered to form Cu-based micropatterns. Femtosecond laser system operating with a pulse duration of 120 fs, wavelength of 780 nm, and repetition frequency of 80 MHz, was used for direct writing in air. P-type Cu2O/NiO composite micropatterns were obtained only on the glass substrates, even though n-type Cu-Ni micropatterns were formed on the both glass and flexible PEN substrates. These results indicate that metal oxide nanoparticles were well-reduced on the polymer substrates because of their low thermal conductivities. In addition, the re-oxidization of the reduced metals were prevented on the polymer substrates due to their contribution as reductants. Both thermistor-type Cu-rich thermoelectric-type and Cu-Ni-rich thermal detectors were fabricated by reducing CuO nanoparticles and CuO/NiO mixed nanoparticles, respectively. The sensitivity of the detector was 5.3 μV/K. The devices can be used as various sensors in internet of things.
Conference Presentation
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Mizue Mizoshiri "Direct writing of Cu-based flexible thermal detectors using femtosecond laser-induced reduction", Proc. SPIE 10905, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIV, 1090512 (4 March 2019); doi: 10.1117/12.2507087; https://doi.org/10.1117/12.2507087
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