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Poster De Conférence Année : 2021

Comparative study of the picosecond laser surface texturing of YSZ and CGO on YSZ films for electrochemical cells applications

Résumé

The interaction between ultrashort laser beam pulses with thin films induces the formation of surface micro/nanostructures. These laser-induced periodic surface structures (LIPSS), or ripples, could improve the physico-chemical properties of thin films including their specific surface. In the case of electrochemical cells made of an assembly of thin films, they can further improve the performance of the electrode by increasing the specific contact surface by laser structuring of a wide range of materials which is an increasingly powerful technique for species active at the electrode / electrolyte interface. In this work, a picosecond Nd: YAG laser operating at its third harmonic (=355 nm) is used to irradiate the surface of gadolinium-doped ceria (CGO) thin films, grown on yttria-stabilized zirconia (YSZ) by magnetron sputtering (Fig.1.a). Furthermore, we have applied the direct texturing of YSZ in order to compare and analyze the specific surface resulting from the two laser structuring approaches (Fig.1.b). The morphological characteristics of the thin films and their structuring were observed by high resolution scanning electron microscopy (HR-SEM) (Fig.2). LIPSS are generally produced in a low fluence laser multi-pulse regime close to the ablation threshold. They were obtained with the period of approximately 283 nm and 268 nm, respectively on CGO / YSZ and YSZ, under appropriate values of laser fluence (F from 184 to 295 mJ/cm2), scanning speed (0.2 mm/s to 0.4 mm/s for CGO/YSZ) and number of pulses (N from 1000 to 2000). Exceeding the threshold leads to surface ablation. In agreement with the literature, it has been noted that these periodic structures can be classified as Low Spatial Frequency LIPSS (LSFL) or High Spatial Frequency LIPSS (HSFL) [1-3]. The optimization of laser parameters to controllably generate clear and uniform LIPSS without film ablation is one the main challenges. Using numerical tools for SEM/AFM images, the enhancement of the specific surface of the thin films will also be discussed.
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Dates et versions

hal-04321770 , version 1 (04-12-2023)

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  • HAL Id : hal-04321770 , version 1

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Wael Karim, Martin Mickan, Agnès Petitt, Malek Tabbal, Anne-Lise Thomann, et al.. Comparative study of the picosecond laser surface texturing of YSZ and CGO on YSZ films for electrochemical cells applications. 4th International Conference on Applied Surface Science, Jun 2021, Virtual conference, France. ⟨hal-04321770⟩
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