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Expedient paramagnetic properties of surfactant-free plasmonic silicon-based nanoparticles

Abstract

Surfactant-free multifunctional semiconductor-metallic nanostructures possessing several modalities are formed due to laser-induced structural modification of pure silicon nanoparticles in the presence of gold. It results to variable size-dependent chemical composition examined by energy-dispersive X-ray spectroscopy. Laser-synthesized silicon-based nanocomposites exhibit remarkable both plasmonic and paramagnetic properties. Their plasmonic maxima are found to be easily adjusted in the whole visible spectral range. Influence of resonant laser irradiation on spin behaviour of silicon-gold nanoparticles is established. Their spin–lattice and spin–spin relaxation processes are investigated as well. Such multifunctional nanoparticles can reveal a huge potential for different applications in field of nanomedicine, in particular, for biosensing and bioimaging.

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Abbreviations

nano-Si:

Nanostructured silicon

Si NPs:

Silicon nanoparticles

fs:

Femtosecond

Si@Au NPs:

Silicon-gold nanoparticles

HR-TEM:

High-resolution transmission electron microscopy

EDX:

Energy-dispersive X-ray spectroscopy

cw:

Continuous wave

EPR:

Electron paramagnetic resonance

AuXSiY :

Gold silicide nanoformulation

Pb-center:

Silicon dangling bond

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Acknowledgements

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. LO1602). Yu.V.R. also acknowledge a financial support from Freie Universität Berlin within the Excellence Initiative of the German Research Foundation (0503121810) as well as from a COST Project (ECOST-STSM-BM1205-120416-072252).

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Contributions

YVR conceived and designed the research, YVR and JB performed experiments, analysed obtained data and wrote the manuscript. All authors have given approval to the final version of the manuscript.

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Correspondence to Yury V. Ryabchikov.

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This article is part of the Topical Collection on Fundamentals of Laser Assisted Micro- and Nanotechnologies.

Guest edited by Tigran Vartanyan, Vadim Veiko, Andrey Belikov and Eugene Avrutin.

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Ryabchikov, Y.V., Behrends, J. Expedient paramagnetic properties of surfactant-free plasmonic silicon-based nanoparticles. Opt Quant Electron 52, 177 (2020). https://doi.org/10.1007/s11082-020-02297-6

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  • DOI: https://doi.org/10.1007/s11082-020-02297-6

Keywords

  • Silicon nanoparticle
  • Silicon-gold nanoparticle
  • Nanocomposite
  • EPR
  • Laser ablation
  • Plasmonic property