20.500.12556/DKUM-47993 SOLVOTERMALNA SINTEZA NANODELCEV V SISTEMU Ln-Y-B, Ln = La, Gd IN B = S, Se SOLVOTHERMAL SYNTHESIS OF NANOPARTICLES IN THE SYSTEM Ln-Y-B, WHERE Ln = La OR Gd AND B = S OR Se Fluorescenčni nanodelci dopirani z lantanoidi predstavljajo alternativo obstoječim bio-označevalcem v fluorescenčni mikroskopiji. Pogoj za učinkovito fluorescenco je ustrezna kristalna matrica, med katere spadajo tudi halkogenidi. To delo je študija solvotermalne sinteze nanodelcev v sistemu Ln-Y-B, kjer je Ln = La ali Gd in B = S ali Se. Osredotočil sem se predvsem na sintezo nanodelcev v ternarnem sistemu La-Y-S vzporedno pa sem študiral tudi sintezo v sistemih La-Y-Se, Y-S in Gd-S. Ti materiali so bili do sedaj sintetizirani le s kristalizacijo iz taline, nikoli pa solvotermalno. Študiral sem nastanek nanodelcev z izborom različnih reagentov in njihove koncentracije ter vpliv različnih topil, temperatur in sinteznega časa. Vzorce smo karakterizirali z rentgensko praškovno difrakcijo in s presevnim elektronskim mikroskopom. S primerjavo vseh zbranih rezultatov sem ugotovil, da pri 200ºC oz. 220ºC in pri sinteznem času 15h oz. 24h nastanejo nanodelci LaYS3 in LaYSe3, vendar pa produkt ni enofazen. V zaključku predlagam smernice za izboljšanje izkoristka sinteze. Fluorescent nanoparticles doped with lanthanides represent an alternative to the existent biomarkers in fluorescent microscopy. The condition for a successful fluorescence is an adequate crystal matrix, among which are also chalcogenide matrices. This is a study of a solvothermal synthesis of nanoparticles in the system Ln-Y-B, where Ln=La or Gd, and B=S or Se. I focused mainly on the synthesis of nanoparticles in the system La-Y-S; concurrently I also studied the synthesis in the systems La-Y-Se, Y-S and Gd-S. These materials have hitherto been acquired only with thermal decomposition, but never with solvothermal synthesis. I studied the formation of nanoparticles by selecting different solvents, various reagents and their concentrations, at given temperatures and synthesis times. Samples were characterized both by, X-ray powder diffraction and the transmission electron microscope. A comparison of the results revealed that at temperature of 200° C or 220° C and at synthesis time of 15 or 24 h, nanoparticles with compositions of LaYS3 and LaYSe3 formed; however, the product was not a single-phase. In the conclusion guidelines for improving the efficiency of the synthesis are proposed. Solvotermalna sinteza nanodelci LaYS3 Solvothermal synthesis nanoparticles LaYS3 true true false [A. Križaj] Slovenski jezik Angleški jezik Diplomsko delo 2015-05-08 12:13:08 2015-06-02 11:55:57 2022-05-23 03:07:22 2021-05-08 03:25:30 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 542.913(043.2) 19082774 URN:SI:UM:DK:RQ4GOTKW UN_Krizaj_Aljaz_2015.pdf UN_Krizaj_Aljaz_2015.pdf 1 22F788EE1A2EAF3F67C4FF33BC3BEF1A 14aaa3ba99acfa01f36d4e94c16b240d017904ad6a541b4fdd3546ec97a15bae a3b78110-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=71726 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0