We performed laser ablation of doped oxides, Y 2 O 3 :-Eu 3þ , Gd 2 O 3 :Eu 3þ , and Y 3 Al 5 O 12 :Ce 3þ (YAG:Ce), in an aqueous solution of 2-[2-(2-methoxyethoxy)ethoxy]acetic acid (MEEAA). Nanoparticles are produced and characterized using electron microscopy and luminescence spectroscopy. We show that the polyether chain ensures the stabilization of the objects formed in aqueous medium while the complexing group limits their size and sharpens the size distribution. The nanoparticles produced from the sesquioxide targets are in a "cubic disordered" phase as expected for very small particles. The ablation of the YAG target leads to a majority of R-Al 2 O 3 and YAG nanoparticles and a minority of YAlO 3 nanoparticles. Infrared spectroscopy is used to characterize the nature of the complex formed between the ligand and the particle surface. We demonstrate that the coordination mode of the carboxylate (-COO -) group to metal ions of the nanoparticles' surface is the bridging bidentate mode.
The main objective of this contribution is to point out the potentialities of cerium doped LuAG single crystal as pixels and fibers. We first show that after optimization of growth conditions using Bridgman technology, this composition exhibits very good performances for scintillating applications (up to 26 000 photons/MeV). When grown with the micropulling down technology, fiber shapes can be obtained while the intrinsic performances are preserved. For the future high energy experiments requiring new detector concepts capable of delivering much richer informations about x- or gamma-ray energy deposition, unusual fiber shaped dense materials need to be developed. We demonstrate in this frame that cerium doped LuAG is a serious candidate for the next generation of ionizing radiation calorimeters.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.