Dhari, Rosana Martina (2019) Analisis Struktur Lokal ZnO Dengan Substitusi Mn Menggunakan X-Ray Absorption Spectroscopy (XAS). Masters thesis, Institut Teknologi Sepuluh November.
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Abstract
X-ray Absorption Spectroscopy (XAS) digunakan untuk mengkarakterisasi nanopartikel ZnO yang didoping dengan logam transisi Mn. XAS terdiri dari pengukuran X-Ray Absorption Near Edge Spectroscopy (XANES) dan Extended X-Ray Absorption Fine Structure (EXAFS) dengan menggunakan Mn-K edge. Sampel Zn1-xMnxO yang dianalisis dengan menggunakan spektrum XAS Mn-K edge dengan konsentrasi Mn 0,00-0,10 menginformasikan tentang tingkat oksidasi, geometri struktur dan struktur lokal nano material Zn1-xMnxO. Struktur lokal disekitar atom absorber Mn dengan analisis EXAFS meliputi jenis atom tetangga terdekat, bilangan koordinasi, dan jarak atom tetangga terdekat. Analisis XANES mengindikasikan kenaikan tingkat oksidasi seiring dengan penambahan konsentrasi dopan Mn. Spektrum XANES pada sampel Zn1-xMnxO diinterpolasikan dengan standard reference yaitu Mn foil, MnO, Mn2O3 dan MnO2 mengindikasikan bahwa pendopingan Mn pada nanopartikel ZnO memiliki tingkat oksidasi +3 dan memiliki sifat paramagnetik. Hasil analisis spektrum EXAFS menggunakan Mn-K edge pada didapatkan atom tetangga terdekat dari atom absorber Mn adalah atom oksigen dengan ikatan Mn-O dengan jarak antar atom yang memiliki nilai berkisar ~ 1,94 Å, bilangan koordinasi ⁓ 2,99, Debye-Waller factor (σ^2) memiliki rata–rata nilai ~ 0.003 Å dan R-factornya 0,019022.
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X-ray Absorption Spectroscopy (XAS) was used to characterize ZnO nanoparticles doped with Mn transition metals. XAS consists of X-Ray Absorption Near Edge Spectroscopy (XANES) and Extended X-Ray Absorption Fine Structure (EXAFS) measurements using the Mn-K edge. The Zn1-xMnxO samples were analyzed using the XAS Mn-K edge spectrum with Mn concentrations of 0.00-0.10 informing the level of oxidation, geometry of structures and local structures of nano material Zn1-xMnxO. Local structures around the Mn absorber atom with EXAFS analysis include the closest neighbor atom type, coordination number, and closest neighbor atomic distance. XANES analysis indicates an increase in oxidation rate along with the addition of the concentration of dopant Mn. The XANES spectrum in the Zn1-xMnxO sample was interpolated with the standard reference, namely Mn foil, MnO, Mn2O3 and MnO2 indicating that the deposition of Mn on ZnO nanoparticles had a +3 oxidation rate and had paramagnetic properties. The results of the EXAFS spectrum analysis using the Mn-K edge to obtain the closest neighboring atom from the Mn absorber atom are oxygen atoms with an Mn-O bond with an atomic distance that has a value of ~ 1.94 Å, coordination number ⁓ 2.99, Debye-Waller factor (σ^2) has an average value of ~ 0.003 Å and the R-factor is 0.019022.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Mn, Pendopingan, ZnO, XAS, tingkat oksidasi, struktur lokal |
| Subjects: | Q Science > QC Physics > QC765 Magnetic materials |
| Divisions: | Faculty of Natural Science > Physics > 45101-(S2) Master Thesis |
| Depositing User: | Dhari Rosana Martina |
| Date Deposited: | 20 Jul 2026 05:03 |
| Last Modified: | 20 Jul 2026 05:03 |
| URI: | http://repository.its.ac.id/id/eprint/67732 |
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