Physics

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Browsing Physics by Subject "absorption"

Now showing 1 - 3 of 3
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    PENGARUH TINGKAT KEASAMAN TERHADAP SIFAT OPTIK SEMIKONDUKTOR SENG OKSIDA YANG DISINTESIS SECARA KIMIAHIJAU
    (Elfitra, 2022-07) Putri, Seliana; Rini, Ari Sulistyo
    In this study, ZnO samples were synthesized with the microwave-assisted Pometia pinnata extract at 540 Watts of power. ZnO samples were prepared by varying the pH from 8 to 12. The results of the ZnO synthesis were analyzed for optical absorption properties with a wavelength of 250-750 nm using UV-Vis spectroscopy. The highest absorption peak was obtained at pH 11 sample with an absorbance value of 1.2 a.u. Each sample has a different absorbance value and wavelength. This ZnO sample has the potential to be applied in photocatalyst processes.
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    STUDI SIFAT OPTIK DAN STRUKTUR KRISTAL NANOPARTIKEL SENG OKSIDA EKSTRAK DAUN MATOA DENGAN BANTUAN GELOMBANG MIKRO
    (Elfitra, 2022-07) Maheta, Gema; Rini, Ari Sulistyo
    The synthesis of microwave-assisted ZnO nanoparticles at a power of 540 Watts has been successfully carried out. The formation of ZnO was prepared using a biosynthesis method with Matoa leaf extract. In this study, ZnO samples were analyzed for their optical absorption properties and crystal structure. The results of UV-Vis spectrophotometry analysis showed that there was an absorbance peak in the range of 300-800. Crystal structure analysis on XRD described seven characteristic peaks with a wurtzite crystal structure where the highest peak was in the plane (101). This ZnO sample has the potential to be applied as a photocatalyst or solar cell material.
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    STUDI SIFAT OPTIK NANOPARTIKEL PERAK BERBASIS EKSTRAK DAUN MATOA
    (Elfitra, 2022-07) Adnan, Gilar; Rini, Ari Sulistyo
    The synthesis of silver nanoparticles using matoa leaf extract as a bioreductant has been successfully carried out. In this study, AgNO3 samples were synthesized by varying the heating time at 0, 30, 60, 90, and 120 seconds using microwave irradiation. The optical properties of AgNO3 samples were characterized using Ultraviolet-visible (UV-Vis) spectroscopy. The peak of UV-Vis absorption that occurs is at a wavelength of 400-460 nm. This result shows that the peak characteristic of silver nanoparticles with 90 seconds is the most optimum because it produces the highest absorption peak