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All Journal BERKALA FISIKA Journal of Physics and Its Applications International Journal of Renewable Energy Development
Soesanto, Qidir Maulana Binu
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Astronomy Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics

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Journal : Journal of Physics and Its Applications

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Characterization of Optical Properties of Colloidal Gold Solution based on Changes in Concentration using Light Polarization Method Winarno, Winarno; Firdausi, Ketut Sofjan; Soesanto, Qidir Maulana Binu; Khumaeni, Ali
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.22406

Abstract

This research was conducted to determine the effect of concentration on the characteristics of changes in the polarization angle of colloidal gold solutions. The method used in this research is natural polarization. The light source used was a green laser with a wavelength of 532 nm. The colloidal gold solution was obtained using the laser ablation method and then dissolved in aquabidest. The characteristics of changes in the angle of light polarization in the gold colloidal solution were obtained by varying the concentration of the gold colloidal solution (40 ppm, 30 ppm, 20 ppm, and 10 ppm). The results showed that gold colloids have optical activity because the orientation of the gold colloid molecules allows them to interact asymmetrically with linearly polarized light. In the range of concentration from 10 to 40 ppm, the polarization angle in gold colloids shows a linear pattern as a function of concentration. Within one month the colloidal gold sample showed stable properties. This method allows us to further analyze the quality of other types of colloids using the same method. This will improve our understanding of the interaction of polarized light with nanoparticles.
Influence of annealing on the physical and optical properties of Ge thin films deposited using thermal evaporation Hilmi, Isom; Adam, Muhammad Kevin; Purwadi, Joko; Soesanto, Qidir Maulana Binu; Kusuma, Damar Yoga
Journal of Physics and Its Applications Vol 7, No 2 (2025): May 2025
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i2.24517

Abstract

Germanium (Ge) is extensively utilized in various technological applications, particularly in optoelectronic devices due to its favorable electronic properties. In this study, Ge thin films were deposited onto soda-lime glass substrates using the thermal evaporation technique. The deposited films were subsequently subjected to annealing at temperatures ranging from 200 to 700 °C. Comprehensive characterization of the films was performed using XRD to analyze crystallinity, UV-Vis spectroscopy to evaluate optical properties, and SEM to investigate surface topography. The annealing process induced a significant phase transformation from an amorphous state to a co-existing Ge and GeO2 structures, as evidenced by XRD measurements. This structural evolution was accompanied by notable changes in the optical properties of the films. Specifically, an increase in annealing temperature resulted in a higher absorbance in the longer wavelength regions of the UV-Vis spectrum. These findings highlight the possibility of a controlled manipulation on the structural and optical characteristics of Ge thin films by thermal treatment, with potential applications in optoelectronic devices.
Co-Authors Adam, Muhammad Kevin Ali Khumaeni Heri Sugito Hilmi, Isom Joko Purwadi Ketut Sofjan Firdausi, Ketut Sofjan Kusuma, Damar Yoga Much Azam Nurhasanah, Wahidatun Dewi Puji Widiyanto, Puji Rahmawati, Aidah Soesanto, Qidun Maulana Binu Tiwiyaningsih, Tiwiyaningsih Very Richardina Winarno Winarno