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All Journal JPAP (Jurnal Penelitian Administrasi Publik) (e-Journal) Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Risalah Fisika Makara Journal of Science
Alfarisa, Suhufa
Department of Physics, Universitas PGRI Palembang, Indonesia
Agriculture, Biological Sciences & Forestry Chemistry Decision Sciences, Operations Research & Management Mathematics Physics Other

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Journal : Makara Journal of Science

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Morphological and Structural Studiesof ZnO Micro-Nanorod Structures Synthesized Using a Low-Cost Hydrothermal Method Alfarisa, Suhufa; Toruan, Parmin Lumban; Atina, Atina; Dwandaru, Wipsar Sunu Brams; Safitri, Rika Noor
Makara Journal of Science Vol. 22, No. 2
Publisher : UI Scholars Hub

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Micro-nanorod structuresof zincoxide (ZnO) have been successfully synthesized via a simple and low-cost hydrothermal method. ZnO solutions with different concentrations of 0.05 and 0.1 M were prepared using zinc nitrate tetrahydrate and hexamethylenetetramine precursors. They were dissolved inaquadesand stirred before the hydrothermal process at 95 °C for 4 hours in an oven. Extensive characterizations using scanning electron microscope (SEM) and X-ray diffraction (XRD) were conductedon ZnO powder samples. SEM results showed that hexagonally shaped ZnO micro-nanorods were formed with diameters ranging from hundreds of nanometers to several micrometers. The ZnO sample synthesized at 0.05 M was observedto have a better surface morphological structurethan the 0.1 M sample. In addition, XRD measurements confirmed that samples exhibited a hexagonal crystal structure of ZnO. Moreover, the calculated crystallite sizes of ZnO using the Debye-Scherrer equation using the full-width half maxima of the XRD peaks were 25.153 nm for the 0.05 M sample and 28.707 nm for the 0.1 M sample. The most prominent growth of ZnO had 101 plane orientation or nonpolara-plane followed by nonpolar 100 m-plane and 002 polar c-plane orientations.This studyoffersa simple andlow-costroute to producehigh-quality ZnO micro-nanorods for use in various electrical and optical devices.
Density Profiles, Energy, and Oscillation Strength of a Quantum Dot in Two Dimensions with a Harmonic Oscillator External Potential using an Orbital-free Energy Functional Based on Thomas–Fermi Theory Alfarisa, Suhufa; Dwandaru, Wipsar Sunu Brams; Darmawan, Denny
Makara Journal of Science Vol. 20, No. 1
Publisher : UI Scholars Hub

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This research aims i) to determine the density profile and calculate the ground state energy of a quantum dot in two dimensions (2D) with a harmonic oscillator potential using orbital-free density functional theory, and ii) to understand the effect of the harmonic oscillator potential strength on the electron density profiles in the quantum dot. This study determines the total energy functional of the quantum dot that is a functional of the density that depends only on spatial variables. The total energy functional consists of three terms. The first term is the kinetic energy functional, which is the Thomas–Fermi approximation in this case. The second term is the external potential. The harmonic oscillator potential is used in this study. The last term is the electron–electron interactions described by the Coulomb interaction. The functional is formally solved to obtain the electron density as a function of spatial variables. This equation cannot be solved analytically, and thus a numerical method is used to determine the profile of the electron density. Using the electron density profiles, the ground state energy of the quantum dot in 2D can be calculated. The ground state energies obtained are 2.464, 22.26, 90.1957, 252.437, and 496.658 au for 2, 6, 12, 20, and 56 electrons, respectively. The highest electron density is localized close to the middle of the quantum dot. The density profiles decrease with the increasing distance, and the lowest density is at the edge of the quantum dot. Generally, increasing the harmonic oscillator potential strength reduces the density profiles around the center of the quantum dot.
Co-Authors Abu Bakar, Suriani Atina - Atina, Atina Denny Darmawan Parmin Lumbantoruan Rifai, Dwi Ahmad Rika Noor Safitri Safitri, Rika Noor Toruan, Parmin Lumban Wipsar Sunu Brams Dwandaru