Absorption Characteristics of ZrO₂ Nanomaterials for Photocurrent Generation
dc.contributor.advisor | Rauwel, Erwan Yann | |
dc.contributor.advisor | Rauwel, Protima | |
dc.contributor.author | Soosaar, Guido | |
dc.date.accessioned | 2023-06-02T12:12:51Z | |
dc.date.available | 2023-06-02T12:12:51Z | |
dc.date.defensed | 2023-06-13 | |
dc.date.issued | 2023 | |
dc.description | Bachelor’s thesis Engineering | eng |
dc.description.abstract | This 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.abstract | Selles 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.uri | http://hdl.handle.net/10492/8462 | |
dc.publisher | Eesti Maaülikool | est |
dc.rights | info:eu-repo/semantics/openAccess | eng |
dc.subject | bakalaureusetööd | est |
dc.subject | nanotechnology | eng |
dc.subject | nanoparticles | eng |
dc.subject | UV-Vis absorption spectroscopy | eng |
dc.subject | ZrO₂ | |
dc.subject | HfO₂ | |
dc.title | Absorption Characteristics of ZrO₂ Nanomaterials for Photocurrent Generation | eng |
dc.title.alternative | ZrO₂ nanoosakeste neeldumisomaduste uurimine fotogalvaaniliste rakenduste jaoks | est |
dc.type | info:eu-repo/semantics/bachelorThesis | eng |
rioxxterms.freetoread.startdate | 13.09.2023 |