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- Title
Laser Ablation-Assisted Synthesis of Plasmonic Si@Au Core-Satellite Nanocomposites for Biomedical Applications.
- Authors
Al-Kattan, Ahmed; Tselikov, Gleb; Metwally, Khaled; Popov, Anton A.; Mensah, Serge; Kabashin, Andrei V.; Kulinich, Sergei
- Abstract
Owing to strong plasmonic absorption and excellent biocompatibility, gold nanostructures are among best candidates for photoacoustic bioimaging and photothermal therapy, but such applications require ultrapure Au-based nanoformulations of complex geometry (core-shells, nanorods) in order to shift the absorption band toward the region of relative tissue transparency (650–1000 nm). Here, we present a methodology for the fabrication of Si@Au core-satellite nanostructures, comprising of a Si core covered with small Au nanoparticles (NP), based on laser ablative synthesis of Si and Au NPs in water/ethanol solutions, followed by a chemical modification of the Si NPs by 3-aminopropyltrimethoxysilane (APTMS) and their subsequent decoration by the Au NPs. We show that the formed core-satellites have a red-shifted plasmonic absorption feature compared to that of pure Au NPs (520 nm), with the position of the peak depending on APTMS amount, water−ethanol solvent percentage and Si−Au volume ratio. As an example, even relatively small 40-nm core-satellites (34 nm Si core + 4 nm Au shell) provided a much red shifted peak centered around 610 nm and having a large tail over 700 nm. The generation of the plasmonic peak is confirmed by modeling of Si@Au core-shells of relevant parameters via Mie theory. Being relatively small and exempt of any toxic impurity due to ultraclean laser synthesis, the Si@Au core-satellites promise a major advancement of imaging and phototherapy modalities based on plasmonic properties of nanomaterials.
- Subjects
MIE scattering; GOLD nanoparticles; NANOCOMPOSITE materials; LASERS; REDSHIFT; BIO-imaging sensors; MATRIX-assisted laser desorption-ionization; PLASMONS (Physics)
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 3, p592
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11030592