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Lermusiaux, Laurent; Roach, Lucien; Lehtihet, Moncef; Plissonneau, Marie; Bertry, Laure; Buissette, Valérie; Le Mercier, Thierry; Duguet, Etienne; Drisko, Glenna L; Leng, Jacques; Tréguer-Delapierre, Mona
Nanomaterials (Basel, Switzerland), 02/2023, Letnik: 13, Številka: 3Journal Article
We describe a new approach to making ultrathin Ag nanoshells with a higher level of extinction in the infrared than in the visible. The combination of near-infrared active ultrathin nanoshells with their isotropic optical properties is of interest for energy-saving applications. For such applications, the morphology must be precisely controlled, since the optical response is sensitive to nanometer-scale variations. To achieve this precision, we use a multi-step, reproducible, colloidal chemical synthesis. It includes the reduction of Tollens' reactant onto Sn -sensitized silica particles, followed by silver-nitrate reduction by formaldehyde and ammonia. The smooth shells are about 10 nm thick, on average, and have different morphologies: continuous, percolated, and patchy, depending on the quantity of the silver nitrate used. The shell-formation mechanism, studied by optical spectroscopy and high-resolution microscopy, seems to consist of two steps: the formation of very thin and flat patches, followed by their guided regrowth around the silica particle, which is favored by a high reaction rate. The optical and thermal properties of the core-shell particles, embedded in a transparent poly(vinylpyrrolidone) film on a glass substrate, were also investigated. We found that the Ag-nanoshell films can convert 30% of the power of incident near-infrared light into heat, making them very suitable in window glazing for radiative screening from solar light.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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