PENGARUH PENAMBAHAN LAPISAN rGO TERHADAP ENERGI ADSORPSI DAN BANDGAP Sr-LaFeO3 SEBAGAI SENSOR GAS ETANOL MENGGUNAKAN DENSITY FUNCTIONAL THEORY

    Vania Wirnawati, - (2024) PENGARUH PENAMBAHAN LAPISAN rGO TERHADAP ENERGI ADSORPSI DAN BANDGAP Sr-LaFeO3 SEBAGAI SENSOR GAS ETANOL MENGGUNAKAN DENSITY FUNCTIONAL THEORY. S1 thesis, Universitas Pendidikan Indonesia.

    Abstract

    Material LaFeO3 atau Lanthanum orthoferrite merupakan material yang berpotensi sebagai bahan pembuat sensor gas yang molekul gas penyusunnya terdiri dari oksigen. Namun, LaFeO3 sebagai bahan sensor gas etanol memiliki kinerja yang kurang optimal dalam hal sensitivitas dan selektivitas sehingga diperlukan pemberian doping. Doping Strontium (Sr) dipilih untuk meningkatkan sensitivitas sensor gas. Selain itu, penambahan lapisan reduce graphene oxide (rGO) dapat meningkatkan selektivitas sensor gas etanol. Penelitian ini bertujuan untuk mempelajari pengaruh penambahan lapisan rGO terhadap energi adsorpsi dan bandgap SrLaFeO3 (SLFO) sebagai sensor gas etanol menggunakan Density Functional Theory (DFT). Perhitungan DFT dilakukan untuk menghitung energi adsorpsi dan energi bandgap SrLaFeO3 murni dan SrLaFeO3 dengan penambahan lapisan rGO ketika mendapat paparan molekul etanol. Pada penelitian ini, energi adsorpsi SrLaFeO3 ketika terpapar etanol bernilai -5,12 eV dan menjadi -6,09 eV setelah diberi lapisan rGO sedangkan untuk energi bandgap SrLaFeO3 murni sebesar 0,83 eV dan ketika dilapisi rGO menjadi 0,04 eV. Untuk SrLaFeO3 yang terpapar etanol bernilai 0,40 eV dan menjadi 0,02 eV ketika dilapisi rGO. Berdasarkan hasil tersebut penambahan lapisan rGO dapat memperkecil energi bandgap SrLaFeO3 dan berpotensi dapat meningkatkan sensitivitas dan selektivitas sensor gas etanol berbasis SrLaFeO3.

    LaFeO3 or Lanthanum orthoferrite material is a potential material as a component of a gas sensor whose gas molecules consist of oxygen. However, LaFeO3 as an ethanol gas sensor material has less than optimal performance in terms of sensitivity and selectivity so that doping is required. Strontium (Sr) doping was chosen to increase the sensitivity of the gas sensor. In addition, the addition of a reduced graphene oxide (rGO) layer can increase the selectivity of the ethanol gas sensor. This study aims to study the effect of adding an rGO
    layer on the adsorption energy and bandgap energy of SrLaFeO3 (SLFO) as an ethanol gas sensor using Density Functional Theory (DFT). DFT calculations were carried out to calculate the adsorption energy and bandgap energy of pure SrLaFeO3 and SrLaFeO3 with the addition of an rGO layer to exposure to ethanol molecules. In this study, the adsorption energy of SrLaFeO3 when exposed to ethanol was -5.12 eV and became -6.09 eV after being coated with rGO. For SrLaFeO3 bandgap energy is 0,83 eV and when coated with rGO becomes 0.04 eV. For SrLaFeO3 exposed to ethanol is 0.40 eV and becomes 0.02 eV when coated with rGO. Based on these results, the addition of rGO layer can reduce the bandgap energy of SrLaFeO3 and has the potential to increase the sensitivity and selectivity of SrLaFeO3-based ethanol gas sensors.

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    Official URL: https://repository.upi.edu
    Item Type: Thesis (S1)
    Additional Information: https://scholar.google.com/citations?user=BAvt9-IAAAAJ&hl=id ID SINTA Dosen Pembimbing: Endi Suhendi: 5976806 Judhistira Aria Utama: 6125861
    Uncontrolled Keywords: LaFeO3, Strontium, SrLaFeO3, reduce graphene oxide, sensor gas etanol, density functional theory
    Subjects: Q Science > Q Science (General)
    Q Science > QC Physics
    Divisions: Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam > Program Studi Fisika - S1 > Program Studi Fisika (non kependidikan)
    Depositing User: Vania Wirnawati
    Date Deposited: 10 Sep 2024 19:39
    Last Modified: 10 Sep 2024 19:39
    URI: http://repository.upi.edu/id/eprint/123977

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