Formation and Growth of Platinum Nanostructures in Cubic Mesoporous Silica

Abstract

Platinum nanoparticles, nanorods, and nanonetworks were fabricated in mesoporous silica MCM-48. Investigations including transmission electron microscopy (TEM) with electron diffraction, powder X-ray diffraction (PXRD) with Rietveld analysis, and extended X-ray absorption fine structure analysis (EXAFS) suggest the crystal growth mechanism, packing arrangement, and oxidative capability of confined nanostructured metal in the MCM-48 host with a three-dimensional channel structure and cubic Ia3d symmetry.

Controlled synthesis of highly dispersed TiO2 nanoparticles using SBA-15 as hard template

“…Thus, the controlled synthesis of TiO 2 nanoparticles with specific size and morphology would generate significant opportunities for applications. Among various preparation methods of nanoparticles, the "host-guest" synthesis method provides a good choice for the synthesis of nanoparticles with controllable size and shape due to in a confined three-dimensional (3D) space [8][9][10][11]. In this synthesis process, the most important step is to effectively introduce the inorganic ions into the pore channels.…”

Tailored Alloying Extent and Structural Evolution of Mesostructured PtRu Nanoparticles on Microemulsion Lyotropic Liquid-Crystalline Phases with Varied Heptane Concentrations

“…8,9 Typical metal-based nanostructured materials have been supported on mesoporous silica materials or produced from mesoporous silica materials as hard templates to enhance the reactive surface area of metallic materials. 10,11 In 1997, Attard et al 12,13 described a unique synthetic scheme to yield platinum films with well-ordered long-range mesoporous structures and large specific surface areas by templating of lyotropic liquid-crystalline (LLC) phases composed of highly concentrated nonionic surfactant solutions. Since those reports, numerous mesoporous metal or alloy materials have been synthesized with soft-templating of the LLC phases, such as Sn, Pd, Rh, Ni-Co, Pt-Ru, and Cd-Te.…”

“…The development of highly ordered and tunable mesostructures of metallic or alloy materials with large pore volumes, large internal surface areas, and specific pore structures has attracted growing interest due to scientific importance and various prospective technical applications, such as sensors, batteries, fuel cells, metallic catalysis, and plasmonics. − The synthesis of inorganic mesoporous materials (e.g., MCM-41, MCM-48, and MCM-50) using ionic surfactant template molecules was first reported by Kresge et al in 1992. , The self-assembly of nonionic oxirane surfactants has been widely applied to synthesize highly ordered mesoporous SiO 2 of SBA families, including 3-D cubic, 3-D hexagonal, 2-D hexagonal, and lamellar structures. , Typical metal-based nanostructured materials have been supported on mesoporous silica materials or produced from mesoporous silica materials as hard templates to enhance the reactive surface area of metallic materials. , In 1997, Attard et al , described a unique synthetic scheme to yield platinum films with well-ordered long-range mesoporous structures and large specific surface areas by templating of lyotropic liquid-crystalline (LLC) phases composed of highly concentrated nonionic surfactant solutions. Since those reports, numerous mesoporous metal or alloy materials have been synthesized with soft-templating of the LLC phases, such as Sn, Pd, Rh, Ni-Co, Pt-Ru, and Cd-Te. − Concerted efforts have been devoted to develop various synthetic methods to synthesize LLC-templated ordered mesoporous materials with a large surface area, diverse composition, variable pore structure, and a tunable pore size .…”

Synthesis of Pt–OMG mesoporous composite via nanocasting and chemical vapor infiltration

“…The hard-templating or nanocasting strategy has become popular in the last decade. [11][12][13][14][15][16][17][18][19][20][21][22] In these methods, a mesoporous silica network was first synthesized using surfactants 23,24 and then used as templates to synthesize highly crystalline ordered mesoporous materials with nanometer pore size and wall thickness. 11,[14][15][16][17][18][19][20][21][25][26][27][28] These mesoporous metal oxides are strong enough to be self-supportive and usually have specific surface area comparable to nanoparticles whose size is similar to their wall thicknesses.…”