Formation and Luminescent Properties of Al2O3:SiOC Nanocomposites on the Base of Alumina Nanoparticles Modified by Phenyltrimethoxysilane

Abstract

Al2O3:SiOC nanocomposites were synthesized by thermal treatment of fumed alumina nanoparticles modified by phenyltrimethoxysilane. The effect of annealing temperature in inert ambient on structure and photoluminescence of modified alumina powder was studied by IR spectroscopy as well as photoluminescence spectroscopy with ultraviolet and X-ray excitation. It is demonstrated that increase of annealing temperature results in formation of silica precipitates on the surface of alumina particles that is accompanied by development and spectral evolution of visible photoluminescence. These observations are discussed in terms of structural transformation of the surface of Al2O3 particles.

Substrate Purity Effect on the Defect Formation and Properties of Amorphous Anodic Barrier Al2O3

“…It has to be noted that, although the anodized Al 2 O 3 oxides were amorphous, local Al-O short ordered clusters with similar vibrational properties than crystalline compounds are also expected. 53 In agreement with the H decrease detected in RBS, the OH and CH band intensities decrease with increasing anodizing voltage. As claimed from ERDA measurements, the trends of the C-containing species (with edges observed at ca.…”

Nanoscale Au-ZnO Heterostructure Developed by Atomic Layer Deposition Towards Amperometric H2O2 Detection

“…5e .0 μm-120 mM. It must be stressed that such a wide linear range for the sensor based on ALD-fabricated Au-ZnO heterostructure is the widest linear range among all electrochemical [28][29][30][31][32][33][34][35], chemiluminescent [36,37,72], colorimetric [23][24][25], and fluorometric [37][38][39][40] H 2 O 2 detectors reported to date. In addition to the widest linear measured H 2 O 2 concentrations range and extremely fast response-recovery time, the low LOD of 0.78 mM was achieved for the Au-ZnO heterostructures.…”

“…Consequently, it is critical to detect H 2 O 2 rapidly and selectively particular at the low concentrations level. So far several methods have already been established for fast H 2 O 2 detection including colorimetric [22][23][24][25], non-enzymatic [26,27], electrochemical [28][29][30][31][32][33][34][35], chemiluminescent [36][37][38][39], and fluorometric [39,40] measurements. Although all of them demonstrated reasonable results and good repeatability, their main disadvantages include complex separation processes, time-consuming derivation and relatively high running cost.…”

Multifunctional Properties of Al2O3/Polyacrylonitrile Composite Coating on Cu to Suppress Dendritic Growth in Anode-Free Li-Metal Battery

“…In as-received Al 2 O 3 nanoparticles, the strong absorption peak at 3464 cm –1 corresponds to a hydroxyl group (−OH) stretching vibration and peak at 1637 cm –1 is due to −OH bending from absorbed molecular water. The valley between 1000 and 500 cm –1 bands are due to the stretching vibrations of Al–O bonds in octahedral (500–750 cm –1 ) and tetrahedral (750–900 cm –1 ) coordinated Al. , …”