Polylysine-grafted Au144 nanoclusters: birth and growth of a healthy surface-plasmon-resonance-like band

Chemical Science
Ivan GuryanovFlavio Maran

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 t...Continue Reading

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Citations

Oct 12, 2017·Chemical Communications : Chem Comm·Nan XiaZhikun Wu
Feb 29, 2020·Angewandte Chemie·Pei SuJulia Laskin
Sep 29, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Da Chen, Jinghong Li
May 9, 2019·The Journal of Physical Chemistry Letters·M Mozammel HoqueRobert L Whetten

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Methods Mentioned

BETA
biosensors
surface plasmon resonance
transmission electron microscopy
NMR
electron beam
dynamic light scattering
X-ray
acetylation

Software Mentioned

Fityk

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