Co‐Template Directed Synthesis of Gold Nanoparticles in Mesoporous Titanium Dioxide

Abstract

A bottom-up synthetic methodology to encapsulate pre-synthesized, well-defined gold nanoparticles (AuNPs) into mesoporous titanium dioxide framework (Au@mTiO ) is reported. This method employs two structurally and chemically similar templates of amphiphilic block copolymers as well as poly(ethylene oxide)-tethered AuNPs, which showed excellent stability during sol-gel transition and thermal annealing at elevated temperatures. Such synthesis enabled precise control of sizes and loading of AuNPs within the mesoporous TiO framework. In light-driven methanol dehydrogenation, the presence of AuNPs significantly enhanced the photocatalytic activity of mTiO . This co-template-directed synthesis presents new opportunities to understand the effect of AuNP size in photocatalysis using Au@mTiO materials.

Soft-template-assisted synthesis: a promising approach for the fabrication of transition metal oxides

“…88 This method has been employed for the synthesis of a large number of TMOs nanoparticles and TMOs/ noble metal hybrids for diverse applications. [89][90][91][92]…”

Polymer‐Assisted Co‐Assembly towards Synthesis of Mesoporous Titania Encapsulated Monodisperse PdAu for Highly Selective Hydrogenation of Phenylacetylene

“…The ligand exchange was carried out by following the previous reports . Typically, the concentrated PdAu NPs were added into 2 mL of PEO−SH solution (5 mg mL −1 ) under sonication.…”

“…The ligand exchange was carried out by following the previous reports. [42,47] Typically, the concentrated PdAu NPs were added into 2 mL of PEOÀ SH solution (5 mg mL À 1 ) under sonication. The mixture was then keep stirring overnight to allow the ligand exchange.…”

Successful Synthesis of Gold Nanoparticles through Ultrasonic Spray Pyrolysis from a Gold(III) Nitrate Precursor and Their Interaction with a High Electron Beam

“…The different production methods can be divided into bottom‐up and top‐down approaches. Bottom‐up approaches include sol–gel, chemical vapor deposition, flame spray synthesis, various pyrolysis, and atomic or molecular condensation . Top‐down approaches include laser ablation, nanolithography, and high‐energy milling .…”

“…Bottom-up approaches include sol-gel, chemical vapor deposition, flame spray synthesis, various pyrolysis, and atomic or molecular condensation. [20][21][22] To p-downa pproaches include laser ablation, nanolithography,a nd high-energym illing. [23,24] Currently,t hese methods are suitable for the production of small quantitieso f nanoparticles (NPs) with major variations in the shapes and sizes of the NPs as ar esult of the productiono fd ifferent batches.…”