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Image Search Results
Journal: Langmuir : the ACS journal of surfaces and colloids
Article Title: Nanoshells made easy: improving Au layer growth on nanoparticle surfaces
doi: 10.1021/la802049p
Figure Lengend Snippet: Schematic of shell layer deposition for nanoshell synthesis in the thin shell limit. A SiO2 core decorated with Au nanoparticles, in a HAuCl4 solution, serves as the deposition substrate, upon which a shell layer is grown using either carbon monoxide or formaldehyde reductants. Variations in shell morphology observed using H2CO reductant solutions can be avoided using CO as the reducing agent.
Article Snippet: 1) Chloroauric acid: gold (III) chloride (HAuCl 4 ·3H 2 O, 99%), 2) THPC colloidal gold suspension: Tetrakis(hydroxymethyl)phosphonium chloride (THPC, 80% solution in H 2 O), sodium hydroxide (1 M), and chloroauric acid, 3) Plating Solution: potassium carbonate (certified A.C.S., Fisher Sci.) and chloroauric acid, 4) SiO 2 core functionalization: condensed silica core particles (Ammonia stabilized, 30% colloid silica, Precision Colloids, Cartersville, Georgia) and 3-aminopropyltriethoxysilane (APTES, minimum 98% Sigma), 5) Hematite cores: ferric chloride (FeCl 3 ·6H 2 O) and potassium phosphate (KH 2 PO 4 ), 6) Precursor nanoparticle synthesis: functionalized silica or hematite cores, THPC gold solution, sodium chloride, 200 proof ethanol (Plarmco-Aaper), 7) Reducing agents: carbon monoxide (CO, 99.0%) (
Techniques: