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Absorption Characteristics of ZrO₂ Nanomaterials for Photocurrent Generation

dc.contributor.advisorRauwel, Erwan Yann
dc.contributor.advisorRauwel, Protima
dc.contributor.authorSoosaar, Guido
dc.date.accessioned2023-06-02T12:12:51Z
dc.date.available2023-06-02T12:12:51Z
dc.date.defensed2023-06-13
dc.date.issued2023
dc.descriptionBachelor’s thesis Engineeringeng
dc.description.abstractThis thesis studies the absorbance and band gap properties of HfO₂, ZrO₂ nanoparticles (NPs), and their solid solutions (HfₓZr₁-ₓO₂). Five samples were created with different proportions (x = 0, 0.3, 0.5, 0.7, and 1). The absorbance of the samples was measured in the range of 200 to 1000 nm region using a UV-Vis spectrophotometer (UV-1600PC, USA), while their band gap properties were calculated from Tauc plots. Maximum absorbance was observed in the range of 276-312 nm which corresponds to the band gap of 3.5 - 3.6 eV. Under UV excitation close to the adsorption range (i.e. 360 nm), a white luminescence from the sample was observed. Collected data were plotted using the software Origin Pro. The possible evolution of the bandgap of the solid solution was evaluated as a function of x or the Hf:Zr ratios.eng
dc.description.abstractSelles lõputöös uuritakse valguse neeldumist ja optilise keelutsooni laiust ZrO₂ ja HfO₂ nanoosakestes ning nende segatud proovides (HfₓZr₁-ₓO₂). Valmistati viis proovi erinevates vahekordades (x = 0, 0.3, 0.5, 0.7 and 1). Proovide valguse neeldumist mõõdeti UV-Vis spektrofotomeetriga (UV-1600PC, USA) vahemikus 200-1000 nm ning arvutati nende energiavahemikud kasutades Tauc plot meetodit. Maksimaalset neeldumist täheldati vahemikus 276-312 nm mis vastab energiale 3.5-3.6 eV. Valgustades proove UV valguse lainepikkusega 360 nm täheldati valget luminesentsi, mis vastab mõõdetud valguse neeldumise vahemikele. Proovide energivahemikku hinnati funktsioonina nende Hf:Zr suhtesse. Kogutud andmeid uuriti Origin Pro tarkvara abil.est
dc.identifier.urihttp://hdl.handle.net/10492/8462
dc.publisherEesti Maaülikoolest
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.subjectbakalaureusetöödest
dc.subjectnanotechnologyeng
dc.subjectnanoparticleseng
dc.subjectUV-Vis absorption spectroscopyeng
dc.subjectZrO₂
dc.subjectHfO₂
dc.titleAbsorption Characteristics of ZrO₂ Nanomaterials for Photocurrent Generationeng
dc.title.alternativeZrO₂ nanoosakeste neeldumisomaduste uurimine fotogalvaaniliste rakenduste jaoksest
dc.typeinfo:eu-repo/semantics/bachelorThesiseng
rioxxterms.freetoread.startdate13.09.2023

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