Growth of Gold Nanoparticle Arrays in TiO₂ Mesoporous Matrixes

Abstract

An interconnected Au nanoparticle arrangement is obtained by electrodeposition from Au(III) soluble complexes within the pore system of block-copolymer templated mesoporous titania films. The resulting Au@TiO2 nanocomposites (5 nm Au particles, 5.5 nm amorphous titania walls) have the electrochemical behavior of a gold electrode of high surface area. The attenuation of Au surface plasmon due to -OH electroadsorption and the existence of mixed localized states in these Au@TiO2 nanocomposites are observed by in situ spectroelectrochemistry.

Multifunctional, Multilayer, Multiscale: Integrative Synthesis of Complex Macroporous and Mesoporous Thin Films with Spatial Separation of Porosity and Function

“…Nanometersized species have also been included inside the pores of these materials, extending the possibilities of these systems as advanced optical materials. [19] The integration of the different existing strategies to build complex porous multilayer films with a wide variety of frameworks, porosities, and tunable functionalities is of interest in the advanced coatings field. The possibility of obtaining stacked layers with varying composition, pore size, and organic or inorganic functions opens the path towards building complex architectures in the nanometer and sub-micrometer range, where the relative position, distance, and interconnection between cavities or nano-objects with different physical and chemical features (e.g., sensors, nanoreactors, trapped quantum dots) can be assembled to form sophisticated multifunctional nanodevices.…”

Coating of Ordered Large-Pore Mesoporous Silica with TiO2 Nanoparticles and Evaluation of Its Photocatalytic Activity

“…However, synthesis of mesoporous TiO 2 often encounter several difficulties such as crystal phase control and mesostructure control [9][10][11][12][13].…”

Enhancement of surface enhanced Raman scattering activity of Au nanoparticles through the mesostructured metallic nanoparticle arrays

“…[1][2][3][4][5][6][7][8] Especially in molecular sensing, the spacing and packing order of gold NPs were found to have an intriguing hotspot effect for drastically surface-enhanced Raman scattering (SERS). [9][10][11] In preparing such advanced materials, mesoporous silica with highly ordered channels provides convenient templates in formation and confinement of the size and distribution of metallic NPs reduced within the calcined channel pores.…”

“…The fine spot-reflections could be completely indexed with 2D hexagonal packing (H), revealing that the PSS films comprising highly oriented H domains, with the channels oriented along the air-water interface. 6,14 The corresponding lattice size 4.24 nm is deduced from (10) reflection peak position. 6,15 The ordered domain size of the H domains estimated from the peak widths of the reflections was ca.…”

“…6,14 The corresponding lattice size 4.24 nm is deduced from (10) reflection peak position. 6,15 The ordered domain size of the H domains estimated from the peak widths of the reflections was ca. 0.5 µm.…”