Рік видавництва: 2019
Рік видавництва: 2019
Laser-induced engineering and characterization of multimodal silicon-based nanoparticles
1HiLASE Centre, Institute of Physics of the Czech Academy of Sciences, Dolni Brezany, Czech Republic
2P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Department of Solid State Physics, Moscow, Russian Federation
Recent progress in laser technologies provokes comprehensive studies on laser-matter interaction using various materials. One of the most interesting and most important employment of lasers is related to synthesis of new nanomaterials with unique properties for a wide set of applications. Interaction between ultrafast laser radiation and bulk / powder materials in different environments provokes efficient substance removal resulting to formation of nanoparticles with properties depending on experimental conditions . Moreover, it has been shown lately that ultrafast laser irradiation significantly modifies semiconductor nanostructures in the presence of metal forming composite nanoparticles [2,3]. Such a modification reveals unique modalities ensuring biomedical applications of nanocomposites, in particular, molecule detection by means of surface-enhanced Raman scattering . Nevertheless, study of laser-synthesized composite nanostructures is at an early stage and information about their properties and applications as well is still missed in literature.
In this work, different kinds of silicon-based nanostructures have been prepared by pulsed laser ablation synthesis. In order to form nanocomposites, a two-step method has been developed [2,3,5]. Firstly, pure silicon nanoparticles are prepared by laser-induced decomposition of silicon microparticles dispersed in deionized water. Their size distributions are controlled by multiple experimental parameters . The second step - their laser-induced structural modification due to laser-ablation of a gold target immersed in silicon nanoparticle colloidal solution has been carried out.
In results, composite silicon-gold nanoparticles with strong size-dependent properties are formed. Synthesized nanostructures have been investigated by different structural, optical and electronic methods. Their employment for molecule detection using surface-enhanced Raman scattering ability is studied as well compared to initial silicon nanoparticles .
This research work was financially supported from the European Regional Development Fund and the state budget of the Czech Republic (Project BIATRI: CZ.02.1.01 / 0.0 / 0.0 / 15_003 / 0000445), from the Ministry of Education, Youth and Sports (Programs NPU I-Project no. L01602).
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