NDLI: Polylysine-grafted Au<sub>144</sub> nanoclusters: birth and growth of a healthy surface-plasmon-resonance-like band

Content Provider	Royal Society of Chemistry (RSC)
Author	Polo, Federico Tennikova, Tatiana Guryanov, Ivan Maran, Flavio Korzhikova-Vlakh, Evgenia Rad, Armin T. Ubyvovk, Evgeniy V. Nieh, Mu-Ping
Copyright Year	2017
Abstract	Poly(amino acid)-coated gold nanoparticles hold promise in biomedical applications, particularly because they combine the unique physicochemical properties of the gold core, excellent biocompatibility, and easy functionalization of the poly(amino acid)-capping shell. Here we report a novel method for the preparation of robust hybrid core–shell nanosystems consisting of a Au144 cluster and a densely grafted polylysine layer. Linear polylysine chains were grown by direct N-carboxyanhydride (NCA) polymerization onto ligands capping the gold nanocluster. The density of the polylysine chains and the thickness of the polymer layer strongly depend on the amount and concentration of the NCA monomer and the initiator. The optical spectra of the so-obtained core–shell nanosystems show a strong surface plasmon resonance (SPR)-like band at 531 nm. In fact, despite maintenance of the gold cluster size and the absence of interparticle aggregation, the polylysine-capped clusters behave as if they have a diameter nearly 4 times larger. To the best of our knowledge, this is the first observation of the growth of a fully developed, very stable SPR-like band for a gold nanocluster of such dimensions. The robust polylysine protective shell makes the nanoparticles very stable under conditions of chemical etching, in the presence of glutathione, and at different pH values, without gold core deshielding or alteration of the SPR-like band. This polymerization method can conceivably be extended to prepare core–shell nanosystems based on other mono- or co-poly(amino acids).
Starting Page	3228
Ending Page	3238
Page Count	11
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	8
Issue Number	4
Journal	Chemical Science
DOI	10.1039/c6sc05187a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Chemical milling Acid Polymerization Polymer Surface plasmon NCA Amino acid N-carboxyanhydride PH Biocompatibility Surface plasmon resonance Polylysine Monomer Gold cluster Nanotechnology Glutathione
Content Type	Text
Resource Type	Article
Subject	Chemistry

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