ZnO synthesized in air by fs laser irradiation on metallic Zn thin films
Por:
Esqueda-Barron, Y., Herrera, M., Camacho-Lopez, S.
Publicada:
1 may 2018
Categoría:
Surfaces, coatings and films
Resumen:
We present results on rapid femtosecond laser synthesis of nanostructured ZnO. We used metallic Zn thin films to laser scan along straight tracks, until forming nanostructured ZnO. The synthesis dependence on laser irradiation parameters such as the per pulse fluence, integrated fluence, laser scan speed, and number of scans were explored carefully. SEM characterization showed that the morphology of the obtained ZnO is dictated by the integrated fluence and the laser scan speed; micro Raman and XRD results allowed to identify optimal laser processing conditions for getting good quality ZnO; and cathodoluminescence measurements demonstrated that a single laser scan at high per pulse laser fluence, but a medium integrated laser fluence and a medium laser scan speed favors a low density of point-defects in the lattice. Electrical measurements showed a correlation between resistivity of the laser produced ZnO and point-defects created during the synthesis. Transmittance measurements showed that, the synthesized ZnO can reach down to the supporting fused silica substrate under the right laser irradiation conditions. The physical mechanism for the formation of ZnO, under ultrashort pulse laser irradiation, is discussed in view of the distinct times scales given by the laser pulse duration and the laser pulse repetition rate. © 2018 Elsevier B.V.
Filiaciones:
Esqueda-Barron, Y.:
Departamento de Óptica, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, Zona Playitas, Ensenada, BC, Mexico
Ctr Invest Cientif & Educac Super Ensenada, Dept Opt, Zona Playitas, Carretera Ensenada Tijuana 3918, Ensenada 22860, BC, Mexico
Herrera, M.:
Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, km 107 Carretera Tijuana – Ensenada, Ensenada, BC, Mexico
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada, Ensenada 22800, BC, Mexico
Camacho-Lopez, S.:
Departamento de Óptica, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, Zona Playitas, Ensenada, BC, Mexico
Ctr Invest Cientif & Educac Super Ensenada, Dept Opt, Zona Playitas, Carretera Ensenada Tijuana 3918, Ensenada 22860, BC, Mexico
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