Publikacje

Abstract:

Control of exposed crystal facets in nanostructures is scientiﬁcally important, but technically challenging due to the inherent diﬃculty in manipulating the surface energy of crystals. Here, laser-induced periodic surface structures(LIPSS) induced by femtosecond laser is applied to produce periodic subwavelength 1D nanostructures with high index crystal facets on epitaxial CoFe2 O4 surfaces, providing an eﬃcient, maskless, cost-eﬀective “top-down ”method for nanostructure fabrication. Homogenous 1D LIPSSs (1D-LIPSSs)with a period of 131 ± 15 nm and a depth of 90 ± 5 nm are obtained. The orientation of LIPSS nanostructures is ﬁnely controlled by tuning the polarization of fs laser beam, therefore ﬂexibly producing 1D-LIPSSs along various crystallographic orientations. Gas sensing performance evaluations that the fabrication of 1D-LIPSSs on CoFe2O4 enlarges its surface area and contributes to enhanced gas sensing response. Compared to CoFe2O4 with LIPSSs faceted along {100} orientation, CoFe2O4 with LIPSSs faceted along high-index {110} facets exhibits further improved gas sensing performance, suggesting the critical role of high-index crystal facets in promoting surface reactivity and sensing sensitivity. The development of a laser-based nanos-tructure fabrication route with high controllability of exposed crystal facets provides a novel solution for high-density ﬁlm-based gas sensing applications.

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Regulation of High-Index Crystal Facets with Laser-Induced Periodic Surface Structures on CoFe2O4 Epitaxial Films for Ethanol Gas Sensing