20.500.12556/RUL-118309 Sinteza borofenov na kovinskih substratih Synthesis of borophenes on metal substrates Bor je v periodnem sistemu sosed ogljika in kaže zanimive fizikalne lastnosti, ki izhajajo iz elektronsko deficitarnih, močno delokaliziranih kovalentnih vezi. Čeprav je od prvih teoretičnih predvidevanj obstoja 2D borovih alotropov minilo že nekaj časa, so bile prve strukture borofena sintetizirane pred kratkim. Zaradi unikatne značilnosti povezovanja borovih atomov v 2D strukture s šestkotnimi prazninami je za borofene značilna alotropija. Nekatere izmed alotropnih modifikacij so stabilnejše in bolj verjetne od drugih, razlikujejo se po fizikalnih ter kemijskih lastnostih. V svetu nanotehnologije so borofeni poželi veliko zanimanja prav zaradi navdihujočih fizikalnih lastnosti kot so: negativno Poisonovo razmerje, močna anizotropija Youngovega modula ter druge zanimive elektronske in toplotne transportne lastnosti. V svojem diplomskem delu na začetku povzamem nekatere osnovne značilnosti bora kot osnovnega gradnika borofenov. Nadaljujem z opisom borofenov, principom njihove alotropije in izgradnje. Na kratko opišem nekatere izmed njihovih izjemnih fizikalnih in kemijskih lastnosti ter njihovo možno uporabo v bližnji prihodnosti. Večina vsebine zavzema njihova priprava na različnih kovinskih substratih. Ti omogočajo njihovo sintezo in so ključni razlog stabilizacije strukture borofena na površini kovine. Vse sinteze se, glede na substrat, ki je uporabljen za njihovo predpripravo, deloma razlikujejo, vendar je njihov princip na zunaj podoben. Ker je bilo do danes eksperimentalno realiziranih le malo sintez borofenov, je do tega trenutka težko zaključiti z natančno definicijo, ki bi definirala sintezo borofena na substratu, ne glede na to, katero kovino bi uporabili za substrat. Za slednje je v prihodnosti potrebnih več dodatnih raziskav in eksperimentalnih potrditev. Za konec povzamem vsako izmed uspešnih sintez borofena na različnem kovinskem substratu. In periodic table, boron is situated next to carbon and exhibits interesting physical properties, which stem from electronically deficient, extremely delocalized covalent bonds. Despite the fact that the first theoretical predictions about the existence of 2D boron allotropes were made some time ago, the first structures of borophene were synthesized fairly recently. The unique quality of arrangement of boron atoms into 2D structures with hexagonal voids is the reason why allotropy is typical of borophenes. Some of the allotropic modifications are more stable and probable than others, they differ in physical and chemical properties. The fact that borophenes have inspiring physical properties such as negative Poisson's ratio, extreme anisotropy of Young's modulus and other intriguing electronic and thermal transport properties is exactly why they have received much interest in the world of nanotechnology. At the beginning of this document I talk about some properties of boron as the main cornerstone of borophene. This is followed by the description of borophenes, the principle of their allotropy and how they are built. I briefly describe some of their exceptional physical and chemical properties and their possible usage in near future. The main part of the content portrays their construction and synthesis on various metallic substrates which enable borophene synthesis and are key for its stabilisation on the metal surface. Each synthesis among the substrates differs in part, yet on the outside their principle looks similar. It is difficult to conclude with a precise definition that would be common to all the borophene syntheses on metallic substrates since only few have been experimentally done up until this day. For the latter, more additional research and experiments to prove it are required. In the conclusion I provide a summary of each of the successfully carried out borophene syntheses on various metallic substrates. borofen sinteza kovinski substrat borophene synthesis metal substrate true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-08-27 10:15:00 2020-08-27 10:15:01 2022-08-30 04:02:50 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 9603 26738435 Oblak_Jost_-_Sinteza_borofenov_na_kovinskih_substratih.pdf Oblak_Jost_-_Sinteza_borofenov_na_kovinskih_substratih.pdf 1 544D89AEB3FD718C8C50AF3825AEA8FF d221878d9587ca5cd70c5d924726b15bb17eab17b1b033d240123b42384f5dd1 74e95f33-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132671 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0