Volframa telurīda nanovadu sintēze un raksturošana

Abstract

“Volframa telurīda nanovadu sintēze un raksturošana”. Sušinska J., darba vadītāja vadošā pētniece Dr. Chem Kunakova G. Maģistra darbs. 53 lappuses, 36 attēli, 4 tabulas, 55 literatūras avoti, 4 pielikumi. Latviešu valodā. Darbā ir veikta WTe2 nanovadu sintēze no WO3 nanovadiem, kuri iegūti ar ķīmisko tvaiku nogulsnēšanas metodi. Paraugus raksturoja ar optisko un skenējošo elektronu mikroskopiem. Iegūto nanovadu biezumu/diametru noteica ar atomspēku mikroskopu. Ķīmisko sastāvu raksturoja ar enerģijas dispersīvo rentgenstaru spektroskopiju skenējošajā elektronu mikroskopā un rentgendifraktometriju. Iegūtie WTe2 nanovadi pārnesti uz Si/SiO2 pamatnēm un, izmantojot elektronu stara litogrāfiju, izgatavotas ierīces lādiņnesēju transporta mērījumiem. Kopumā izstrādātas divas metodes (nātrija piejaukumu saturošu un tīru) WO3 un attiecīgi WTe2 nanovadu iegūšanai. Noteikts, ka ar abām metodēm iegūtie WO3 nanovadi ir tetragonāli un WTe2 – ortorombiski. Izgatavotās WTe2 nanovadu ierīces raksturotas istabas temperatūrā, uzņemot strāvas – sprieguma atkarības.

“Synthesis and characterization of tungsten telluride nanowires”. Sušinska J., supervisor leading researcher Dr. Chem Kunakova G. Master’s thesis. 53 pages, 36 figures, 4 tables, 55 references, 4 appendices. In Latvian. In this work, WTe2 nanowires have been obtained by tellurization of WO3 nanowires, which was synthesized by the chemical vapor deposition method. Optical and scanning electron microscopy were used to characterize the samples. The dimensions (diameters) of the nanowires were determined using atomic force microscopy. The chemical composition was analyzed using energy dispersive X-ray spectroscopy and X-ray diffractometry. Subsequently, the WTe2 nanowires were transferred onto Si/SiO2 substrates, and devices for measuring charge carrier transport were fabricated using electron beam lithography. Overall, two methods (with sodium and pure WO3) have been developed for the production of WO3, and WTe2 nanowires, respectively. The WO3 nanowires obtained from both methods exhibited a tetragonal crystal structure, while the resulting WTe2 nanowires showed an orthorhombic crystal structure. The fabricated WTe2 nanowire devices were characterised at room temperature by taking current-voltage dependences.