Browsing by Author "Rini, Ari Sulistyo"

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    ANALISIS NANOPARTIKEL ZnO YANG DISINTESIS MENGGUNAKAN EKSTRAK KULIT NANAS (ANANAS COMOSUS)
    (2020-09) Yanuar, Sri Hafiza; Rini, Ari Sulistyo
    ZnO nanoparticles have been synthesized using pineapple peel extract (ananascomosus) with various precursor to extract volume ratio. The samples resulted from the synthesis of ZnO nanoparticles were characterized using Ultraviolet-Visible (Uv-Vis) Spectroscopy, X-Ray Diffractometer (XRD), Fourier Transform Infra-Red (FTIR) and Scanning Electron Microscopy (SEM). The UV-Vis spectrum of the sample shows strong absorption peaks that occurs over a range of wavelengths of 300-380 nm for all samples. The diffraction pattern of the XRD exhibits seven diffraction peaks that correspond to the hkl of hexagonal wurtzite structure. The highest peak intensity (the strongest line) is in the crystal plane (101). The FTIR spectrum displays absorbance peaks that represent the involvement of N-H and O-H functional groups derived from polyphenol compounds in the synthesis process. SEM images show the morphology of ZnO sample are mixed spherical and flower-like shape. The size of the nanoparticles obtained exceeds 100 nm and shows the evidence of agglomeration. The volume of the extract affects the energy gap, the size and shape of the ZnO particles.
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    BIOSINTESIS DAN KARAKTERISASI (Optik dan XRD) SENG OKSIDA DIDOPING SULFUR MENGGUNAKAN EKSTRAK DAUN MATOA
    (Elfitra, 2023-03) M, Syahrul; Rini, Ari Sulistyo
    ZnO nanoparticles have been prepared through a biosynthetic method using microwave method with the addition of sulfur doping with percentage variations of 1 and 2%. Sulfur doping ZnO particles in the form of flakes from synthesis were characterized using UV-Vis spectroscopy and x-ray diffraction (XRD). The UV-Vis absorption spectrum shows absorption peaks in the UV region of 300-400 nm with bandgap energy ranging from 3.04-3.08 eV. XRD analysis exhibit the crystal size is in the range of 33 nm. The emerging plane peaks in the 30-80° angle range confirm wurtzite-shaped crystals with high purity of ZnO particles
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    BIOSINTESIS NANOKOMPOSIT Ag-ZnO
    (Elfitra, 2023-01) Marshanda, Tessa; Rini, Ari Sulistyo
    The addition of Ag meal to ZnO nanoparticles can improve the optical properties of the sample which results in a sample function that can be utilized and applied in various fields. In addition, the method used in the manufacture of nanoparticles also needs to be considered to define the environment. The use of ZnO (zink oxide) semiconductor material is an option in the manufacture of nanoparticles that have properties that are not easily damaged, are able to absorb UV rays better, are resistant to high temperatures, and are safer than other metals. The addition and insertion of silver metal was proven to increase the function and reactivity of ZnO samples. The method of making nanoparticles is divided into two, namely chemical and biological. Manufacture of nanoparticles using natural materials is proven to be safer and environmentally friendly compared to synthesis using chemicals that are harmful to the environment and tend to be quite expensive. In this study, pineapple peel was chosen as a reducing agent in the manufacture of nanoparticles. Pineapple rind has been reported to contain savonins and flavonoids which function to assist in the synthesis process. In addition, the use of pineapple peel is also a solution in reducing organic waste. In the process of making nanoparticles, pineapple peel extract is dried and mashed before being mixed with ZnO semiconductor material. Meanwhile, in the process of making, Ag-ZnO nanocomposite, the synthesis of ZnO nanoparticles is carried out first and then after mixing the ZnO solution which has been mixed with pineapple peel extract and AgNO3 powder until homogeneous then centrifuged and dried. Analysis of the optical properties of the sample was carried out by using a spectrophotometer UV-Vis characterization which showed the morphology on the surface of the sample. The results of this characterization show that the peak absorption of UV light in the sample is at a wavelength of 362 nm and the processed data from the test can be seen that the sample band gap is 2,98 eV and the morphological structure of the flower-shaped sample with an average size of 126,69 nm.
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    BIOSINTESIS NANOPARTIKEL PERAK DENGAN MENGGUNAKAN EKSTRAK KULIT BUAH KECAPI (Sandoricum Koetjape)
    (2021-02) Anderson, Maximillian; Rini, Ari Sulistyo
    This study aims to investigate the optical properties of silver nanoparticles (NPP) using kecapi fruit skin extract (Sandoricum Koetjape). Silver nanoparticles with kecapi fruit skin extract have been successfully synthesized using biosynthesis method. Synthesis was done by mixing AgNO3 solution as much as 2.5 mM and harp skin extract that has a volume ratio of 1:4, 2:3, 1:1. The optical properties of the sample were analyzed using UV-Vis spectroscopy. UV-Vis spectroscopy analyzes the absorption of samples. This study resulted in the highest absorption occurring in the wavelength range of 350-450 nm. The highest absorbance is in a 2:3 comparison sample with a wavelength of 376 nm.
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    BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK KULIT BUAH NANAS SEBAGAI REDUKTAN
    (perpustakaan UR, 2021-07) Rini, Ari Sulistyo; Siregar, Hertaty
    Biosynthesis of silver (Ag) nanoparticles has been carried out by reacting pineapple peel extract as a reductant and 5 mM AgNO3 solution. The nanoparticle synthesis process was done at a temperature of 80oC for 30 minutes. The obtained nanoparticles were characterized using UV-Vis spectrophotometer and FTIR to study their optical properties and functional groups. The UV-Vis absorption spectrum showed the formation of nanoparticles which is indicated by the appearance of the absorbance peak at a wavelength of 406 nm. The FTIR spectrum shows the optical absorption of functional groups O-H, C=O, and C≡C which is the polyphenol content of pineapple peel extract
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    DEVELOPMENT OF LOW COST SOIL SENSOR BASED ON IMPEDANCE SPECTROSCOPY FOR IN-SITU MEASUREMENT
    (2014-03-10) Umar, Lazuardi; Defrianto; Rini, Ari Sulistyo
    This paper presents a low cost sensor for soil moisture measurement based on impedance spectroscopy. A probe has been designed which uses a simplified impedance measuring system to determine soil water content. Methods of soil moisture measurement need extensive calibration processes because of the strong dependence on soil properties. Using impedance spectroscopy, more information can be delivered from real and imaginary part of the complex permittivity for several frequencies at the same moisture value. Agriculture area in East Sumatra is especially selected for this investigation because measurements of soil moisture in peat swamp area were generally reported as difficult.
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    PEMBUATAN ELEKTRODA KARBON SUPERKAPASITOR DARI BIOMASSA PELEPAH DAUN PINANG
    (Elfitra, 2022-07) Ananta, Anggoro; Farma, Rakhmawati; Taer, Erman; Rini, Ari Sulistyo
    In this study, supercapacitor electrodes were synthesized from areca leaf midrib biomass as a renewable carbon source. The process of making this supercapacitor cell electrode is through a pre-carbonization process, chemical activation, chemical carbonization in N2 gas and physical activation using CO2 gas. Analysis of the physical properties of the carbon electrodes showed that the sample had a density value of 0.637 g/cm3 or a percentage decrease of 36.55%. This study shows that betel leaf midrib biomass which has the potential to be used as carbon electrodes for supercapacitor cell applications.
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    PEMETAAN LAJU DOSIS RADIASI DI SEKITAR INSTALASI RADIOTERAPI RSUD ARIFIN ACHMAD PEKANBARU
    (2020-12) SIMARMATA, RONA INDAH P; Rini, Ari Sulistyo
    The Regional General Hospital (RSUD) Arifin Achmad Pekanbaru, has installed a Linear Accelerator (LINAC) radiotherapy facility since 2009. Mapping of radiation intensity around LINAC is needed to anticipate the effects caused by radiation sources on workers, patients and the community in the installation environment. This study aims to estimate the accumulated radiation dose received by workers at the Radiotherapy Installation of RUSD Arifin Ahmad Pekanbaru. Mapping of radiation dose rates around the radiotherapy radiation source is made based on the isodosis curve of the measurement of the radiation dose rate of the LINAC radiotherapy. Data were collected at 16 measuring points around the LINAC in a measuring field of 10 m x 10 m. Measurement of radiation dose rate was carried out using a Surveymeter when the LINAC was operating with an absorption dose of 300 MU (monitor unit) with the gantry positions of 0 °, 90 °, 180 ° and 270 °. The radiation dose rate map was made using Surfer software. The measurement results show that points A and B which are at the entrance to the radiation chamber experience the largest dose rate when the gantry angle is 0, with the total radiation dose rate in the radiotherapy installation ranging from (0.92 to 3.23) mSv per year. The radiation dose rate is still below the deterministic effect threshold. Therefore, it can be concluded that the radiation effect received by workers and the community around the radiotherapy installation is a stochastic effect
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    PENGARUH PENAMBAHAN DOPING SELENIUM TERHADAP SIFAT OPTIK DAN STRUKTUR KRISTAL SENG OKSIDA HASIL BIOSINTESIS
    (Elfitra, 2023-03) Simatupang, Mediniah Putri; Rini, Ari Sulistyo
    In this study, samples of ZnO doped with Se were prepared using the biosynthetic method with matoa leaf extract. ZnO samples doped with Se were made with variations of doping addition. Optical and structural properties were characterized using UV-Vis Spectroscopy and X-ray Diffraction technique. The results of UV-Vis spectrophotometer analysis showed an absorption peak at a wavelength of 300-600 nm. The hexagonal wurtzite crystal structure with nine diffraction peaks. The effect of the addition of Se doping causes the diffraction peak to shift to a small 2θ. This Se-doped ZnO sample has the potential to be applied in solar cell.
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    PENGARUH SUHU PENUMBUHAN SENG OKSIDA YANG DIPREPARASI DENGAN SINTESIS KIMIA-HIJAU
    (perpustakaan UR, 2021-07) Rini, Ari Sulistyo; Rizky, Wulan Anggi; Rati, Yolanda
    Zinc oxide (ZnO) is a metal oxide semiconductor that has wide applications in various fields and can be produced in various forms of microstructure. The manufacture of ZnO using the green synthesis method was chosen as an alternative step to replace chemical and physical methods, using natural ingredients derived from plant extracts. In this study, ZnO was synthesized using pineapple peel extract (Ananas comosus) by varying the growth temperature, namely 40˚C and 80˚C. Sample characterizations were carried out such as UV-Vis spectroscopy, and FTIR (Fourier Transform Infrared) to determine the level of absorbance, and functional groups of ZnO samples. Based on the results of the UV-Vis spectrum, the absorbance peak of the ZnO sample is in the range of 300-361 nm with band gap energy 3.25 eV and 3.24 eV. The FTIR spectrum shows the functional groups present in the sample, such as C=C, C=O and O-H derived from polyphenol compounds in the synthesis process and Zn-O contained in the wave number 483 cm-1.
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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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    SINTESIS DAN STUDI MORFOLOGI NANOROD ZnO MENGGUNAKAN METODE SILAR-CBD
    (Elfitra, 2023-04) Sari, Siti Laylia; Rini, Ari Sulistyo
    Synthesis of ZnO nanorods on glass substrates has been synthesized using the combination of the Successive Ionic Layer Adsorption Reaction (SILAR) and Chemical Bath Deposition (CBD) methods at 80oC with Field Emission Scanning Electron Microscope (FESEM) characterization on a scale of 1 μm resulting in the morphology of the sample in the form of nanorods showing densely growing and hexagonally shaped nanorods.
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    STUDI SIFAT OPTIK DAN MORFOLOGI PERMUKAAN LAPISAN NANOROD SENG OKSIDA (ZnO)
    (Elfitra, 2023-04) Sitorus, Desi Pitria; Rini, Ari Sulistyo
    ZnO nanorod coatings has been successfully grown on glass slide substrates using a combination of SILAR and CBD method. In this study, the ZnO nanorod coating samples are analyzed for their optical absorption and surface morphology using UV-Vis Spectroscopy and FESEM. The results of the UVVis test shows that the absorption peak of the ZnO coating samples occurred in the ultraviolet wavelength range. The results of the FESEM analysis shows that the geometric shape of the ZnO layer is nanorod with a hexagonal cross section. ZnO nanorod coating samples has the potential to be apply as a selfcleaning material, photocatalyst or solar cell.
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    STUDI SIFAT OPTIK DAN MORFOLOGI PERMUKAAN SAMPEL BIOSINTESIS ZnO DOPING SELENIUM
    (Elfitra, 2023-03) Sonia, Windi; Rini, Ari Sulistyo
    Synthesis of selenium doped ZnO (ZnO/Se) has been successfully carried out. In this study, selenium ZnO doping was prepared by the biosynthesis method using matoa leaf extract. optical properties and surface morphology of ZnO/Se were analyzed using UV-Vis spectroscopy characterization and Field Emission Scanning Electron Microscopy (FESEM). The UV-Vis spectroscopy results show that the absorption peak is in the optical range of 300-700 nm with a decreasing bandgap energy. FESEM analysis showed image magnification of up to 20,000 times with nanoflower morphology
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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