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

AI Article Synopsis

  • Silver nanoparticles (AgNPs) can be synthesized using various methods, with the thermal reduction of silver salts by citric acid or tannic acid being popular but producing size and shape variations. * In this study, nearly uniform spherical AgNPs were created using a one-step method with sodium citrate and varying amounts of thermally preconditioned Tannic Acid (TA), allowing for precise control over particle size. * Optical and NMR analyses suggest that thermal conditioning changes TA's chemical or structural properties, leading to smaller and more consistent AgNP sizes during the synthesis process.

Article Abstract

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 H 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7602624PMC
http://dx.doi.org/10.3390/nano10102031DOI Listing

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