Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio
Hybrid nanoparticles involving 10-nm silver nanoparticles (AgNPs) nucleated on unmodified rod-like cellulose nanocrystals (CNCs) were prepared by chemical reduction. H<sub>2</sub>O<sub>2</sub> used as a post-treatment induced a size-shape transition following a redox mechanis...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/8/1559 |
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| author | Dafne Musino Camille Rivard Bruno Novales Gautier Landrot Isabelle Capron |
| author_facet | Dafne Musino Camille Rivard Bruno Novales Gautier Landrot Isabelle Capron |
| author_sort | Dafne Musino |
| collection | DOAJ |
| description | Hybrid nanoparticles involving 10-nm silver nanoparticles (AgNPs) nucleated on unmodified rod-like cellulose nanocrystals (CNCs) were prepared by chemical reduction. H<sub>2</sub>O<sub>2</sub> used as a post-treatment induced a size-shape transition following a redox mechanism, passing from 10-nm spherical AgNPs to 300-nm triangular or prismatic NPs (AgNPrisms), where CNCs are the only stabilizers for AgNPs and AgNPrisms. We investigated the role of the H<sub>2</sub>O<sub>2</sub>/AgNP mass ratio (α) on AgNPs. At α values above 0.20, the large amount of H<sub>2</sub>O<sub>2</sub> led to extensive oxidation that produced numerous nucleation points for AgNPrisms on CNCs. On the contrary, for α below 0.20, primary AgNPs are only partially oxidized, releasing a reduced amount of Ag<sup>+</sup> ions and thus preventing the formation of AgNPrisms and reforming spherical AgNPs. While XRD and EXAFS reveal that the AgNP fcc crystal structure is unaffected by the H<sub>2</sub>O<sub>2</sub> treatment, the XANES spectra proved that the AgNP–AgNPrism transition is always associated with an increase in the metallic Ag fraction (Ag<sub>0</sub>). In contrast, the formation of new 15-nm spherical AgNPs keeps the initial Ag<sub>0</sub>/Ag<sup>+</sup> ratio unmodified. For the first time, we introduce a complete guide map for the fully-controlled preparation of aqueous dispersed AgNPs using CNC as a template. |
| first_indexed | 2024-03-10T17:46:56Z |
| format | Article |
| id | doaj.art-7011dd5f2a9646ffbbad5bf089a31140 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T17:46:56Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-7011dd5f2a9646ffbbad5bf089a311402023-11-20T09:30:42ZengMDPI AGNanomaterials2079-49912020-08-01108155910.3390/nano10081559Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP RatioDafne Musino0Camille Rivard1Bruno Novales2Gautier Landrot3Isabelle Capron4INRAE, BIA, 44316 Nantes, FranceSOLEIL Synchrotron, L’Orme des Merisiers, Gif-sur-Yvette, 91192 Saint-Aubin, FranceINRAE, BIA, 44316 Nantes, FranceSOLEIL Synchrotron, L’Orme des Merisiers, Gif-sur-Yvette, 91192 Saint-Aubin, FranceINRAE, BIA, 44316 Nantes, FranceHybrid nanoparticles involving 10-nm silver nanoparticles (AgNPs) nucleated on unmodified rod-like cellulose nanocrystals (CNCs) were prepared by chemical reduction. H<sub>2</sub>O<sub>2</sub> used as a post-treatment induced a size-shape transition following a redox mechanism, passing from 10-nm spherical AgNPs to 300-nm triangular or prismatic NPs (AgNPrisms), where CNCs are the only stabilizers for AgNPs and AgNPrisms. We investigated the role of the H<sub>2</sub>O<sub>2</sub>/AgNP mass ratio (α) on AgNPs. At α values above 0.20, the large amount of H<sub>2</sub>O<sub>2</sub> led to extensive oxidation that produced numerous nucleation points for AgNPrisms on CNCs. On the contrary, for α below 0.20, primary AgNPs are only partially oxidized, releasing a reduced amount of Ag<sup>+</sup> ions and thus preventing the formation of AgNPrisms and reforming spherical AgNPs. While XRD and EXAFS reveal that the AgNP fcc crystal structure is unaffected by the H<sub>2</sub>O<sub>2</sub> treatment, the XANES spectra proved that the AgNP–AgNPrism transition is always associated with an increase in the metallic Ag fraction (Ag<sub>0</sub>). In contrast, the formation of new 15-nm spherical AgNPs keeps the initial Ag<sub>0</sub>/Ag<sup>+</sup> ratio unmodified. For the first time, we introduce a complete guide map for the fully-controlled preparation of aqueous dispersed AgNPs using CNC as a template.https://www.mdpi.com/2079-4991/10/8/1559CNC/AgNP hybridsH<sub>2</sub>O<sub>2</sub> redox post-treatmentH<sub>2</sub>O<sub>2</sub>/AgNP mass ratiooxidation stateXANES-EXAFS |
| spellingShingle | Dafne Musino Camille Rivard Bruno Novales Gautier Landrot Isabelle Capron Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio Nanomaterials CNC/AgNP hybrids H<sub>2</sub>O<sub>2</sub> redox post-treatment H<sub>2</sub>O<sub>2</sub>/AgNP mass ratio oxidation state XANES-EXAFS |
| title | Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio |
| title_full | Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio |
| title_fullStr | Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio |
| title_full_unstemmed | Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio |
| title_short | Tuning of Ag Nanoparticle Properties in Cellulose Nanocrystals/Ag Nanoparticle Hybrid Suspensions by H<sub>2</sub>O<sub>2</sub> Redox Post-Treatment: The Role of the H<sub>2</sub>O<sub>2</sub>/AgNP Ratio |
| title_sort | tuning of ag nanoparticle properties in cellulose nanocrystals ag nanoparticle hybrid suspensions by h sub 2 sub o sub 2 sub redox post treatment the role of the h sub 2 sub o sub 2 sub agnp ratio |
| topic | CNC/AgNP hybrids H<sub>2</sub>O<sub>2</sub> redox post-treatment H<sub>2</sub>O<sub>2</sub>/AgNP mass ratio oxidation state XANES-EXAFS |
| url | https://www.mdpi.com/2079-4991/10/8/1559 |
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