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From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis.
ACS Omega. 2020 Mar 24; 5(11):5731-5738.AO

Abstract

The fabrication of silver nanoparticles (Ag NPs) with different sizes by microwave (MW)-assisted synthesis is presented. The fast heating of the MW technique, combined with the possibility to thermally quench the reactions, enabled us to capture snapshots of nucleation and growth processes difficult to accomplish in other techniques. The Ag NPs were synthesized using poly(vinylpyrrolidone) (PVP) through a polyol approach. The effects of the reaction time, the reaction temperatures, and the silver precursor concentration were investigated. The influence of agitation, the PVP concentration, and the initial conditions of the silver precursor was also studied. It is found that at very short reaction times and at low temperatures, polyhedral plates are formed with sizes ca. 300 nm and large polydispersity. However, by increasing the time or the temperature, a size and shape refinement is observed resulting in 10 nm spherical NPs with low polydispersity. Mechanistic insights are provided based on the observations extracted from transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-vis). A formation mechanism starting from kinetically favored silver polyhedral plates to thermodynamically favored spherical nanoparticles is proposed. Understanding these effects allowed us to control the particle size and the tuning of Ag NPs on-demand. Moreover, the reproducibility and scalability of the process and the long-term stability of the NPs in aqueous solutions are demonstrated. Finally, we provide a recommendation regarding the use of fresh PVP as a capping and stabilizing agent.

Authors+Show Affiliations

Institut de Ciència de Materials de Barcelona (ICMAB), CSIC, 08193 Bellaterra, Spain.Institut de Ciència de Materials de Barcelona (ICMAB), CSIC, 08193 Bellaterra, Spain.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32226851

Citation

Torras, Miquel, and Anna Roig. "From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis." ACS Omega, vol. 5, no. 11, 2020, pp. 5731-5738.
Torras M, Roig A. From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis. ACS Omega. 2020;5(11):5731-5738.
Torras, M., & Roig, A. (2020). From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis. ACS Omega, 5(11), 5731-5738. https://doi.org/10.1021/acsomega.9b03748
Torras M, Roig A. From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis. ACS Omega. 2020 Mar 24;5(11):5731-5738. PubMed PMID: 32226851.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - From Silver Plates to Spherical Nanoparticles: Snapshots of Microwave-Assisted Polyol Synthesis. AU - Torras,Miquel, AU - Roig,Anna, Y1 - 2020/03/10/ PY - 2019/11/05/received PY - 2020/02/21/accepted PY - 2020/4/1/entrez PY - 2020/4/1/pubmed PY - 2020/4/1/medline SP - 5731 EP - 5738 JF - ACS omega JO - ACS Omega VL - 5 IS - 11 N2 - The fabrication of silver nanoparticles (Ag NPs) with different sizes by microwave (MW)-assisted synthesis is presented. The fast heating of the MW technique, combined with the possibility to thermally quench the reactions, enabled us to capture snapshots of nucleation and growth processes difficult to accomplish in other techniques. The Ag NPs were synthesized using poly(vinylpyrrolidone) (PVP) through a polyol approach. The effects of the reaction time, the reaction temperatures, and the silver precursor concentration were investigated. The influence of agitation, the PVP concentration, and the initial conditions of the silver precursor was also studied. It is found that at very short reaction times and at low temperatures, polyhedral plates are formed with sizes ca. 300 nm and large polydispersity. However, by increasing the time or the temperature, a size and shape refinement is observed resulting in 10 nm spherical NPs with low polydispersity. Mechanistic insights are provided based on the observations extracted from transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-vis). A formation mechanism starting from kinetically favored silver polyhedral plates to thermodynamically favored spherical nanoparticles is proposed. Understanding these effects allowed us to control the particle size and the tuning of Ag NPs on-demand. Moreover, the reproducibility and scalability of the process and the long-term stability of the NPs in aqueous solutions are demonstrated. Finally, we provide a recommendation regarding the use of fresh PVP as a capping and stabilizing agent. SN - 2470-1343 UR - https://www.unboundmedicine.com/medline/citation/32226851/From_Silver_Plates_to_Spherical_Nanoparticles:_Snapshots_of_Microwave_Assisted_Polyol_Synthesis_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32226851/ DB - PRIME DP - Unbound Medicine ER -
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