期刊
NANOMATERIALS
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/nano11020401
关键词
femtosecond laser pulses; laser ablation in liquids; laser-induced periodic surface structures (LIPSS); surface functionalization; surface enhanced fluorescence (SEF); rhodamine 6G
类别
资金
- Russian Science Foundation [18-79-10091]
- Russian Science Foundation [18-79-10091] Funding Source: Russian Science Foundation
The study demonstrates the single-step laser-assisted fabrication of anti-reflective hierarchical surface textures on silicon with a locally functionalized photoluminescent molecular nanolayer. The dual-scale surface textures exhibit remarkable light-absorbing properties and enhanced fluorescence yield, showing potential for innovative multifunctional sensing devices. pH sensing tests confirm the retention of molecular sensory properties on the nanotextured substrate, suggesting the liquid-assisted laser processing as a key technology for developing novel sensing devices.
Here, we present the single-step laser-assisted fabrication of anti-reflective hierarchical surface textures on silicon locally functionalized with a photoluminescent (PL) molecular nanolayer. Using femtosecond-laser ablation of commercial crystalline Si wafers placed under a layer of a solution containing rhodamine 6G (R6G) a triethoxysilyl derivative, we fabricated ordered arrays of microconical protrusions with self-organized nanoscale surface morphology. At the same time, the laser-induced temperature increase facilitated surface activation and local binding of the R6G derivative to the as-fabricated nanotextured surface. The produced dual-scale surface textures showed remarkable broadband (visible to near-IR) light-absorbing properties with an averaged reflectivity of around 1%, and the capping molecular nanolayer demonstrated a strongly enhanced PL yield. By performing a pH sensing test using the produced nanotextured substrate, we confirmed the retention of sensory properties of the molecules attached to the surface and validated the potential applicability of the high-performing liquid-assisted laser processing as a key technology for the development of innovative multifunctional sensing devices in which the textured substrate (e.g., ultra-black semiconductor) plays a dual role as a support and PL signal amplifier.
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