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A one-step procedure without heat-treatment was carried out to yield the space-selective growth of gold nanoparticles inside a transparent silica matrix. A silica porous monolith was prepared via a sol–gel route and then post-doped with an aqueous solution of hydrogen tetrachloroaurate (HAuCl 4 ) as a gold precursor, in the presence of sodium carbonate as an additive. Direct and local precipitation...
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