Synthesis of silver-coated polystyrene latex through in situ metal reduction

Ray, Nitesh Kumar; Patel, Hardik; Muñoz‐Espí, Rafael; Landfester, Katharina; Gundabala, Venkat

doi:10.1557/s43579-022-00281-7

Cited by 2 publications

(1 citation statement)

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“…Silver is therefore an attractive metal for industrial applications, such as plasmonic glasses and films [ 8 ]. More synthetic approaches have been proposed to prepare nanoshells made of silver than of gold [ 1 ], resulting in various morphologies of silver shells, such as smooth [ 6 , 9 , 10 ], bumpy [ 11 , 12 , 13 ], spiky [ 6 , 10 ], particulate [ 14 , 15 , 16 , 17 , 18 ], and ultrathin [ 19 ]. This structural diversity results in an even larger range of optical properties [ 12 ], which have been used in applications such as photocatalysis [ 16 ], photonic materials [ 20 ], bio-imaging [ 21 ], and drug detection.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoshells with Optimized Infrared Optical Response: Synthesis for Thin-Shell Formation, and Optical/Thermal Properties after Embedding in Polymeric Films

et al. 2023

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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 Sn2+-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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