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Glucosamine Phosphate Induces AuNPs Aggregation and Fusion into Easily Functionalizable Nanowires

1
Department of Chemical Sciences, University of Padova, via Marzolo, 1, 35131 Padova, Italy
2
Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(4), 622; https://doi.org/10.3390/nano9040622
Received: 28 February 2019 / Revised: 7 April 2019 / Accepted: 10 April 2019 / Published: 17 April 2019
(This article belongs to the Special Issue Synthesis and Applications of Functionalized Gold Nanosystems)
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Abstract

The challenge to obtain plasmonic nanosystems absorbing light in the near infrared is always open because of the interest that such systems pose in applications such as nanotherapy or nanodiagnostics. Here we describe the synthesis in an aqueous solution devoid of any surfactant of Au-nanowires of controlled length and reasonably narrow dimensional distribution starting from Au-nanoparticles by taking advantage of the properties of glucosamine phosphate under aerobic conditions and substoichiometric nanoparticle passivation. Oxygen is required to enable the process where glucosamine phosphate is oxidized to glucosaminic acid phosphate and H2O2 is produced. The process leading to the nanosystems comprises nanoparticles growth, their aggregation into necklace-like aggregates, and final fusion into nanowires. The fusion requires the consumption of H2O2. The nanowires can be passivated with an organic thiol, lyophilized, and resuspended in water without losing their dimensional and optical properties. The position of the broad surface plasmon band of the nanowires can be tuned from 630 to >1350 nm. View Full-Text
Keywords: gold nanoparticles; glucosamine phosphate; gold nanowires; surface plasmon resonance gold nanoparticles; glucosamine phosphate; gold nanowires; surface plasmon resonance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Martínez, Á.; Lyu, Y.; Mancin, F.; Scrimin, P. Glucosamine Phosphate Induces AuNPs Aggregation and Fusion into Easily Functionalizable Nanowires. Nanomaterials 2019, 9, 622.

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