CC BY
10LM-O-14
Laser Synthesis of Chemically Pure Multielement Metal-Based Nanostructures
Miroslava Flimelova1, Yury V. Ryabchikov1'2
1— HiLASE Centre, Institute of Physics of the Czech Academy of Sciences, Scientific Laser Application Department, "Mid-IR and bioapplications" group, Za Radnici 828, 25241 Dolni Brezany, Czech Republic 2— P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Department of Solid State Physics, Leninskii Prospekt 53, 19991 Moscow, Russian Federation
Corresponding author: vury.ryabchikov@hilase.cz
Multicomponent nanostructures consisting of several elements reveal a large research interest being served for various aspects in the field of biomedicine [1,2]. Combining different elements in a nanoparticle one can easily vary their physicochemical properties in a wide range adjusting their functionality. However, using chemical-based methods for synthesis can considerably obstruct their applications in biomedical fields due to their contamination by chemical residuals. To overcome the aforementioned issues a versatile method of pulsed laser ablation in liquids is widely employed for the synthesis of pure one- and bi-metallic nanostructures widening their functional properties. As a result, they show wide prospects for applications in various fields of biomedicine, e.g. as contrast agents for magnetic resonance imaging [3,4]. However, manufacturing of composite metallic-based nanoparticles doped with semiconductor elements by means of pulsed laser ablation method is still challenging being at the early stage of its development. Nevertheless, laser-synthesized metallic-semiconductor nanocomposites have already shown promising perspectives for molecule detection using surface-enhanced Raman scattering (SERS) or infrared absorption techniques (SEIRA) having tracking features as Raman modality or paramagnetic defect labels at the same time [5,6]. In this work, gold-silicon nanocomposites with dual modalities were fabricated by direct femtosecond laser ablation in deionized water and characterized by structural and optical techniques. A method of chemical content variation is developed allowing fine-tuning of ratio between gold and silicon atom values. Successful employment of Au/Si nanocomposites for bacteria identification by SERS is demonstrated.
Acknowledgements:
This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 897231 (LADENTHER). We are also thank 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), the Ministry of Education, Youth and Sports (Programs NPU I-Project no. L01602). Yu.R. also acknowledges Freie Universität Berlin for support within the Excellence Initiative of the German Research Foundation (0503121810) as well as personally Prof. J. Behrends.
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