FTIR study of the electronic metal–support interactions on platinum dispersed on silica modified with titania

Abstract

Infrared spectroscopy, using carbon monoxide as probe molecule, was utilized to detect the electronic metal-support interactions on platinum dispersed on silica modified with different titania amounts. The spectral features produced by the electronic metal-support effects were observed only for the materials that present a high titania content and they are related to the crystal titania lattice.

Preparation, characterization and luminescent properties of dense nano‐silica hybrids loaded with 1,8‐naphthalic anhydride

“…1(a,b), all of the other samples exhibited a similar amorphous peak at around 22.3 ( Fig. 1c-g), indicating that the amorphous structure was maintained (20).…”

Anisotropic self-organization of hybrid silica based xerogels containing bridged positively charged 1,4-diazoniabicycle[2.2.2]octane chloride group

“…5 shows the X-ray diffraction results for the sample series. All the diffraction curves show a large peak, with angle 2θ near 20 • , which is characteristic of amorphous silica materials [49]. However, with the increasing of the organic content, two additional peaks were observed, starting from the X60 sample.…”

Luminescent Lanthanide (Eu3+, Tb3+) Hybrids with 4‐Vinylbenzeneboronic Acid Functionalized Si‐O Bridges and Beta‐Diketones

“…4 reveal that all the materials with 10° ≤ 2 θ ≤ 70° are totally amorphous, suggesting the noncrystalline state of the hybrids. All diffraction curves show similar broad peaks centered around 22°, which is attributed to the “amorphous hump” and it is a typical characteristic of amorphous silica backbone materials (35). For amorphous solids, the position of the first sharp diffraction peak can be related, via a reciprocal relation, to a distance in the real space between the structural units (Bragg law: 2dsin θ = nλ ).…”