Selectively Oxidized Schizophyllan as a Template for the Synthesis of Gold Kite-like Nanostructures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63601418" target="_blank" >RIV/70883521:28610/25:63601418 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Selectively Oxidized Schizophyllan as a Template for the Synthesis of Gold Kite-like Nanostructures

Original language description

This study presents a novel approach for synthesizing gold nanostructures with a unique kite-like morphology (AuSCH), enabled by the selective oxidation of schizophyllan. Schizophyllan is a high-molecular-weight polysaccharide composed of a (1→3)-β-ᴅ-glucan backbone with (1→6)-β-ᴅ-glucopyranosyl side chains at every third glucose unit. In nature, it adopts a rigid, triple-helix conformation. Upon selective oxidation and exposure to a gold precursor solution at elevated temperatures, spontaneous formation of AuSCH occurs. These unique nanostructures consist of a thin nanowire tail, 5–10 nm in diameter and up to 150 nm in length, terminated by a larger, faceted nanoparticle approximately 20–50 nm in diameter. Unlike previous approaches that rely on the denaturation and subsequent renaturation of schizophyllan triple-helix to trap preformed gold nanoparticles within its narrow hydrophobic cavity (Bae et al. 2007), our method employs selective oxidation of the side chain with sodium periodate to introduce aldehyde groups on the outer surface of the helix. These functional groups participate in a redox reaction with gold(III) ions, facilitating the template-assisted growth of anisotropic nanostructures on the exterior of helixes. This strategy is not only more direct and efficient but also enables near-quantitative yields, with the added benefit of recyclable oxidants. The synthesized AuSCH structures exhibit excellent catalytic activity, demonstrated by the model reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. Furthermore, the anisotropic morphology of these nanostructures suggests promising potential for sensing applications.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

<a href="/en/project/GA23-07361S" target="_blank" >GA23-07361S: Synthesis of gold nanoparticles for SERS and catalysis guided by selectively oxidized polysaccharides</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů