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Article

Synthesis of Citrate-Stabilized Silver Nanoparticles Modified by Thermal and pH Preconditioned Tannic Acid

Joint Research Centre (JRC), European Commission, 21027 Ispra, Italy
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Nanomaterials 2020, 10(10), 2031; https://doi.org/10.3390/nano10102031
Received: 29 September 2020 / Accepted: 9 October 2020 / Published: 15 October 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Silver nanoparticles (AgNPs) may be synthesized by many different methods, with those based on the thermal reduction of silver salts by citric acid or citric acid/tannic acid being amongst the most commonly used. These methods, although widely used and technically simple, can produce particles in which the size, polydispersivity and morphology can vary greatly. In this work nearly mono-dispersed spherical AgNPs have been synthesized via a one-step reduction method by using sodium citrate and varying quantities of Tannic Acid (TA), which was thermally conditioned prior to use in the growth process. It was found that the final size can be further tailored by controlling the amount of TA and the thermal conditioning of the TA at 60 °C at different time points, which changes the size and polydispersivity of AgNPs. To better understand the origin of this effect, optical spectroscopic analysis and 1H NMR of the TA following mild thermal conditioning of the solution have been done. Comparison of thermally conditioned TA and TA exposed to basic pH shows that similar chemical modifications occur and consequently produce similar effects on growth when used in the synthesis of AgNPs. It is proposed that thermal preconditioning of the TA introduces either chemical or structural changes, which decrease the final particle size under a given total silver content. View Full-Text
Keywords: Tannic acid; Silver Nanoparticles (AgNPs); synthesis; characterization Tannic acid; Silver Nanoparticles (AgNPs); synthesis; characterization
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MDPI and ACS Style

La Spina, R.; Mehn, D.; Fumagalli, F.; Holland, M.; Reniero, F.; Rossi, F.; Gilliland, D. Synthesis of Citrate-Stabilized Silver Nanoparticles Modified by Thermal and pH Preconditioned Tannic Acid. Nanomaterials 2020, 10, 2031. https://doi.org/10.3390/nano10102031

AMA Style

La Spina R, Mehn D, Fumagalli F, Holland M, Reniero F, Rossi F, Gilliland D. Synthesis of Citrate-Stabilized Silver Nanoparticles Modified by Thermal and pH Preconditioned Tannic Acid. Nanomaterials. 2020; 10(10):2031. https://doi.org/10.3390/nano10102031

Chicago/Turabian Style

La Spina, Rita, Dora Mehn, Francesco Fumagalli, Margaret Holland, Fabiano Reniero, François Rossi, and Douglas Gilliland. 2020. "Synthesis of Citrate-Stabilized Silver Nanoparticles Modified by Thermal and pH Preconditioned Tannic Acid" Nanomaterials 10, no. 10: 2031. https://doi.org/10.3390/nano10102031

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