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Merging of Bi-modality of ultrafast laser processing: Heating of Si/Au nanocomposite solutions with controlled chemical content

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    0584335 - FZÚ 2025 RIV CH eng J - Journal Article
    Ryabchikov, Yury V. - Mirza, M. Inam - Flimelová, Miroslava - Káňa, A. - Romanyuk, Olexandr
    Merging of Bi-modality of ultrafast laser processing: Heating of Si/Au nanocomposite solutions with controlled chemical content.
    Nanomaterials. Roč. 14, č. 4 (2024), č. článku 321. E-ISSN 2079-4991
    R&D Projects: GA MŠMT(CZ) EH22_008/0004596
    EU Projects: European Commission(XE) 823897 - ATLANTIC; European Commission(XE) 897231 - LADENTHER
    Grant - others:AV ČR(CZ) StrategieAV21/26
    Program: StrategieAV
    Research Infrastructure: e-INFRA CZ - 90140
    Institutional support: RVO:68378271
    Keywords : ultrafast laser processing * silicon nanoparticles * plasmonic nanoparticles * Si-Au composite nanoparticles * nanocomposites * laser ablation * hyperthermia * photo-thermal therapy
    OECD category: Optics (including laser optics and quantum optics)
    Impact factor: 5.3, year: 2022
    Method of publishing: Open access

    Ultrafast laser processing possesses unique outlooks for the synthesis of novel nanoarchi- tectures and their further applications in the field of life science. It allows not only the formation of multi-element nanostructures with tuneable performance but also provides various non-invasive laser-stimulated modalities. In this work, we employed ultrafast laser processing for the manufac- turing of silicon–gold nanocomposites (Si/Au NCs) with the Au mass fraction variable from 15% (0.5 min ablation time) to 79% (10 min) which increased their plasmonic efficiency by six times and narrowed the bandgap from 1.55 eV to 1.23 eV. These nanostructures demonstrated a considerable fs laser-stimulated hyperthermia with a Au-dependent heating efficiency (~10–20 ◦C). The prepared surfactant-free colloidal solutions showed good chemical stability with a decrease (i) of zeta (ξ) potential (from −46 mV to −30 mV) and (ii) of the hydrodynamic size of the nanoparticles (from 104 nm to 52 nm) due to the increase in the laser ablation time from 0.5 min to 10 min. The electrical conductivity of NCs revealed a minimum value (~1.53 µS/cm) at 2 min ablation time while their increasing concentration was saturated (~1012 NPs/mL) at 7 min ablation duration. The formed NCs demonstrated a polycrystalline Au nature regardless of the laser ablation time accompanied with the coexistence of oxidized Au and oxidized Si as well as gold silicide phases at a shorter laser ablation time (<1 min) and the formation of a pristine Au at a longer irradiation. Our findings demonstrate the merged employment of ultrafast laser processing for the design of multi-element NCs with tuneable properties reveal efficient composition-sensitive photo-thermal therapy modality.
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