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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tailoring Nanoparticle Morphology to Match Application: Growth under Low-Intensity Polychromatic Light Irradiation Governs the Morphology and Optical Properties of Silver Nanoparticles

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Mota, Danielle Ramos [1] ; Silva Lima, Giovanni Alexsander [1] ; Helene, Gustavo Boniatti [1] ; Pellosi, Diogo Silva [1]
Total Authors: 4
[1] Univ Fed Sao Paulo, Dept Chem, Lab Hybrid Mat, BR-09913030 Diadema - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ACS APPLIED NANO MATERIALS; v. 3, n. 5, p. 4893-4903, MAY 22 2020.
Web of Science Citations: 0

Silver nanoparticles (AgNPs) are incredibly versatile nanostructures that present a broad spectrum of applications, from nanomedicine to advanced optoelectronic materials. All AgNP properties strongly depend on nanoparticle size and shape. However, controlling these parameters in a cost-effective way is still a challenge. In this scenario, this study presents a modification of a classical two-step seed-mediated synthesis for photoinduced control of the morphology and optical properties of AgNP under low-intensity light-emitting diode (LED) irradiation in the presence of citrate as the sole additive. The LED irradiation wavelength determines the final morphology of these particles because of the shape dependence of the AgNP plasmon spectrum. Kinetics of photochemical transformation were monitored by electronic absorption, transmission electron microscopy, and X-ray diffraction studies. Data fitting revealed that particle growth follows an unusual two-step photoinduced mechanism that includes (i) a photoinduced fusion of AgNP and (ii) a light-driven autocatalytic anisotropic growth along a favorable silver crystal axis following the Finke-Watzky kinetic model. The proposed mechanism highlights the importance of interweaving both crystallographic and surface chemistry arguments in order to discern the overall mechanism of nanoparticle growth. Therefore, the presented methodology allows obtaining very complex metallic nanostructures using a simple and low-cost methodology aiming the development of size-controllable nanoparticles for optical and (photo)catalytic applications. (AU)

FAPESP's process: 19/01604-3 - Light-assisted synthesis of silver nanoparticles/photosensitizers in polymeric matrix and its synergic application in phototherapies
Grantee:Diogo Silva Pellosi
Support type: Regular Research Grants