Carbon–gold core–shell structures: formation of shells consisting of gold nanoparticles

Abstract

Carbon spheres were obtained via the Stöber method using phenolic resin followed by carbonization. Spherical carbon-gold core-shell particles were fabricated by deposition of gold nanoparticles on the modified surface of carbon spheres.

Facile Fabrication of Core–Shell‐Structured Ag@Carbon and Mesoporous Yolk–Shell‐Structured Ag@Carbon@Silica by an Extended Stöber Method

“…[12][13][14][15][16] In particular, metal nanoparticles encapsulated by carbon already exhibit a high conductivity and are very attractive for catalysis and energy-storage applications. [17][18][19][20] Despite this success, it still remains a great challenge to develop a general method to synthesize carboncoated metal nanoparticles (M@carbon) with controlled particle sizes, structures, compositions, and surface properties.The Stçber method is known to produce colloidal silica spheres through the hydrolysis and condensation of silicon alkoxides, such as tetraethylorthosilicate (TEOS), in basic aqueous solutions of ammonia containing different alcohols such as methanol, ethanol, or isopropanol. [21] Liz-Marzµn, Mulvaney, and co-workers first adopted the well-established Stçber method to successfully synthesize M@SiO 2 .…”

“…[12][13][14][15][16] In particular, metal nanoparticles encapsulated by carbon already exhibit a high conductivity and are very attractive for catalysis and energy-storage applications. [17][18][19][20] Despite this success, it still remains a great challenge to develop a general method to synthesize carboncoated metal nanoparticles (M@carbon) with controlled particle sizes, structures, compositions, and surface properties.…”

Nanoengineering Carbon Spheres as Nanoreactors for Sustainable Energy Applications

“…The synthesis of Au‐decorated carbon nanospheres through the extended Stöber method (Figure c) and the particle size of the as‐formed Au nanoparticles was about 6 nm . In addition, Jaroniec and co‐workers reported the synthesis of carbon spheres with gold nanoparticles decorated on the surface . By using aminopropylsilane to enhance the absorption ability of gold precursors, the finally obtained carbon–gold core–shell structures were composed of the carbon spheres with particle size of about 500 nm and densely packed gold nanoparticles on their surfaces.…”

“…Many methods have been developed for the deposition of metal nanoparticles onto carbon spheres through one‐pot synthesis or post‐synthesis modification in the presence of metal salts. Several methods including directly impregnating metal salts with carbon precursor, spray pyrolysis, hydrothermal synthesis, microwave synthesis, and CVD have been used for the preparation of carbon spheres decorated with metal nanoparticles . The most popular way to achieve metal‐loaded carbon spheres is to impregnate carbon spheres with metal salts, followed by thermal or chemical reduction process.…”

In situ synthesis of SO3H supported Fe3O4@resorcinol–formaldehyde resin core/shell and its catalytic evaluation towards the synthesis of hexahydroquinoline derivatives in green conditions

“…To date, the use of resorcinolformaldehyde resin in the synthesis of core-shell and yolk-shell structures has gained considerable interest. 22,23 In some cases, the Stöber method was used for the sequential hydrolysis and concentration of organo-silanes 24 to prepare the silica colloidal spheres as a reactive linking layer on the magnetic substrates. 25,26 The magnetite based core/shell nanostructures have been studied for more than two decades due to their use in various elds such as catalysis, 27,28 drug carriers, 29,30 lithium batteries, 31,32 sensors, 33,34 and energy storage 35,36 , adsorbents.…”