1. Bakalaureusetööd
Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/7079
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Sirvi 1. Bakalaureusetööd Märksõna "absorbance" järgi
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Kirje Determining the Absorption Wavelengths of Solar Cell Nanomaterials – Case of Zinc Oxide Nanoparticles(Eesti Maaülikool, 2021) Kaeval, Henno; Rauwel, Protima; Rauwel, Erwan Yann; Nagpal, KeshavIn this thesis the absorbance and band gap properties of ZnO nanoparticles (NP), which is a solar cell and photocatalytic material, have been investigated. The absorbance of the ZnO NP were measured using a UV-Vis spectrophotometer and their band gap properties were calculated. Four different samples of ZnO NP were already synthesized. Several steps after synthesis of these NP were carried out before obtaining a powder of ZnO NP, explained in this thesis. To measure the absorbance of these nanomaterials, ZnO NP were spread homogeneously in isopropanol. For absorbance studies, a UV-Vis II Nanocolor spectrophotometer by MACHEREY-NAGEL was used to measure the absorbance with a measurement range of 190–1100 nm. Isopropanol was also used as reference during the measurements. The UV-Vis spectrophotometershows the maximum absorbance of these ZnO NP in 356.8-363.1 nm range. All the results were plotted using software Origin and MS Excel. Energy band gaps were calculated using tauc plot method. The calculated band gap of ZnO NP were in 3.160-3.288 eV range which is comparable with the direct bandgap 3.37 eV of bulk ZnO. These variations in band gap are attributed to the synthesis conditions of these NP.