Journal
MATERIALS
Volume 15, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/ma15228091
Keywords
pulsed laser ablation in liquid; hybrid nanomaterials; silver; silicon; plasmonics; SERS
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Funding
- Russian Science Foundation [21-79-00302]
- Amada Foundation [AF-2019225-B3]
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This article reports a simple and efficient method for synthesizing silver-decorated silicon microspheres and demonstrates the potential of these materials in molecular identification and catalytic transformations. The degree of silver decoration on the surface of silicon microspheres can be controlled by adjusting the amount of AgNO3, offering the possibility for large-scale production of high-quality hybrid nanomaterials.
Combination of dissimilar materials such as noble metals and common semiconductors within unified nanomaterials holds promise for optoelectronics, catalysis and optical sensing. Meanwhile, difficulty of obtaining such hybrid nanomaterials using common lithography-based techniques stimulates an active search for advanced, inexpensive, and straightforward fabrication methods. Here, we report one-pot one-step synthesis of Ag-decorated Si microspheres via nanosecond laser ablation of monocrystalline silicon in isopropanol containing AgNO3. Laser ablation of bulk silicon creates the suspension of the Si microspheres that host further preferential growth of Ag nanoclusters on their surface upon thermal-induced decomposition of AgNO3 species by subsequently incident laser pulses. The amount of the AgNO3 in the working solution controls the density, morphology, and arrangement of the Ag nanoclusters allowing them to achieve strong and uniform decoration of the Si microsphere surface. Such unique morphology makes Ag-decorated Si microspheres promising for molecular identification based on the surface-enhanced Raman scattering (SERS) effect. In particular, the designed single-particles sensing platform was shown to offer temperature-feedback modality as well as SERS signal enhancement up to 10(6), allowing reliable detection of the adsorbed molecules and tracing their plasmon-driven catalytic transformations. Considering the ability to control the decoration degree of Si microspheres by Ag nanoclusters via amount of the AgNO3, the developed one-pot easy-to-implement PLAL synthesis holds promise for gram-scale production of high-quality hybrid nanomaterial for various nanophotonics and sensing applications.
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