Ultrafine Cr-Doped Al2O3 Prepared by Detonation Synthesis

Abstract

Data are presented on the phase composition, particle size distribution, EPR, and luminescence of ultrafine chromium-doped alumina powders prepared by detonation synthesis. The largest particles in the powders are shown to consist mainly of a Cr 2 O 3 solid solution in α -Al 2 O 3 . The luminescence spectrum of fine particles shows, in addition to lines characteristic of ruby, extra lines which are tentatively attributed to Cr 3+ ions incorporated substitutionally into θ -Al 2 O 3 .

Self-Assembly of Nanoparticles Controlled by Resonant Laser Light

“…Since plasmon resonances of metallic nanoparticles are rather wide it is interesting to consider the light-controlled aggregation of nanoparticles with narrower resonances. Such resonances can be found in semiconducting nanoparticles [25,26] and in doped dielectric nanoparticles [27]. The formation of heterogeneous nanostructures that consist of different materials (dielectric, semiconducting and conducting nanoparticles) is also of great interest.…”

Laser-induced Interaction of Multilevel Quantum Dots

“…Formation of pre-defined nanostructures of semiconducting quantum dots (QD) [22], and dielectric nanoparticles with resonant rare earth or transition metal dopants [23] is more prospective. Spectra of these objects, as a rule, contain large number of lines.…”