Rapid Cationization of Gold Nanoparticles by Two‐Step Phase Transfer |
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Authors: | M. Sc. Jukka Hassinen M. Sc. Ville Liljeström Prof. Mauri A. Kostiainen Prof. Robin H. A. Ras |
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Affiliation: | 1. Department of Applied Physics, Aalto University, Puumiehenkuja 2, 02150 Espoo (Finland);2. Department of Biotechnology and Chemical Technology, Aalto University, Kemistintie 1, 02150 Espoo (Finland) |
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Abstract: | Cationic gold nanoparticles offer intriguing opportunities as drug carriers and building blocks for self‐assembled systems. Despite major progress on gold nanoparticle research in general, the synthesis of cationic gold particles larger than 5 nm remains a major challenge, although these species would give a significantly larger plasmonic response compared to smaller cationic gold nanoparticles. Herein we present the first reported synthesis of cationic gold nanoparticles with tunable sizes between 8–20 nm, prepared by a rapid two‐step phase‐transfer protocol starting from simple citrate‐capped particles. These cationic particles form ordered self‐assembled structures with negatively charged biological components through electrostatic interactions. |
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Keywords: | gold nanoparticles phase transfer self‐assembly surface plasmon resonance |
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