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All Journal Jurnal Ilmu Dasar Jurnal Aplikasi Fisika Majalah Ilmiah Pendidikan Matematika dan Ilmu Pengetahuan Alam Jurnal Fisika FLUX Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) RESISTOR: Jurnal Pendidikan Vokasional Teknik Jurnal Aplikasi Fisika International Journal of Acta Material
I Nyoman Sudiana
Department Of Physics Faculty Of Mathematics And Natural Science Haluoleo University
Astronomy Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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Green Synthesis of ZnO Nanoparticles from Henna Leaves (Lawsonia inermis L.) and their Characterization as Photosensitizer in Dye-sensitized Solar Cells W. S. Arsyad; F. S. Palobang; L Agusu; L. O. Rusman; I. Saleh; I N. Sudiana
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.11

Abstract

The green synthesis of ZnO nanoparticles from henna leaf extract and their characterization as photosensitizers in dye-sensitized solar cells was successfully conducted. The henna leaves were extracted with three different solvents specifically distilled water (A), ethanol (E), and methanol (M). The extracts were mixed with Zinc Acetate dihydrate (Znac) with different concentrations of (0.01, 0.02, and 0.03) M to form ZnO nanoparticles. The absorbance spectrum, functional groups, and crystal structure were analyzed using UV-Vis, FTIR, and XRD. UV-Vis analysis revealed the highest absorption peaks at 580.74 nm, 503.63 nm, and 501.36 nm for samples A, E, and M. The FTIR spectrum of henna leaves confirmed the presence of Lawsone, indicated by O-H, C-H, C=O, and C-O functional groups at 3411 cm⁻¹, 2926 cm⁻¹, 1585 cm⁻¹, and 1344 cm⁻¹, respectively. XRD analysis showed the largest crystallite size (76.5 nm) for the 0.03 M Znac sample in methanol (M3), and the smallest (35.7 nm) for the 0.02 M Znac sample in ethanol (E2). The smallest energy gap (Eg) of 2.16 eV was observed in the sample using distilled water (A) as the solvent for the pure extract, while the ZnO nanoparticles (E1) sample had an Eg of 2.57 eV. We found that henna extract and the resulting ZnO nanoparticles were suitable to be used as photosensitizers in DSSC
Transesterification Reaction on Biodiesel Production from Bintaro Oil (Cerbera mangas L.) from Moluccas Island I W. Sutapa; A. Bandjar; H. Tehubijuluw; I. S. Ely; A. Kamari; C. Baskar; I N. Sudiana; L. O. Kadidae
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.15

Abstract

Research on the conversion of bintaro seed oil (Cerbera manghas L.) into biodiesel has been conducted utilizing a KOH catalyst. The biodiesel synthesis involved two reaction stages: esterification and transesterification. The esterification process was executed with a 1.25% H2SO4 (1 M) catalyst, utilizing a methanol-to-oil ratio of 1:9, at a temperature range of 60-65°C for a duration of 2 hours. Following the separation of methanol and triglycerides, transesterification proceeded with a methanol ratio of 1:12, which had previously reacted with KOH catalyst at varying weight percentages of 0.2%, 0.3%, 0.5%, 1%, and 1.5%. The transesterification reaction was conducted over a period of 2 hours at a temperature of 60-65°C. The optimal weight percentage of KOH catalyst identified for the transesterification reaction in the synthesis of biodiesel from bintaro seed oil was determined to be 0.3% KOH catalyst. The resultant biodiesel was subsequently characterized using Fourier Transform Infrared Spectroscopy (FT-IR) and Gas Chromatography-Mass Spectrometry (GC-MS). Physical property tests of the biodiesel fuel, conducted in accordance with ASTM methods, yielded a specific density of 0.8878 g/cm³, a kinematic viscosity of 6 mm²/s, a flash point of 132.5°C, and a pour point of 9°C.
Fabrication and Characterisation of Semi-Solid DSSCs Using Reduced Graphene Oxide (rGO) from Coal as a Filler in Polymer Gel Electrolytes W. O. Sukmawati; L. Ardan; I. Saleh; L. Agusu; I N. Sudiana; I. Usman
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.16

Abstract

In an effort to enhance the conductivity of TMSPMA-based polymer gel electrolytes (PGE), this study incorporated reduced graphene oxide (rGO) as a filler within the PGE matrix. The rGO was synthesized from sub-bituminous coal utilizing a modified Hummer method, while the PGE was formulated through a sol-gel process involving TMSPMA with varying proportions of rGO relative to the PGE. X-ray diffraction (XRD) measurements confirmed the presence of rGO, revealing a peak at a 2θ angle of 24.830° and a calculated crystalline size of 30.44 nm. Fourier-transform infrared spectroscopy (FTIR) characterization indicated that the identified functional groups were consistent with the molecular structure of TMSPMA. Impedance measurements conducted using an LCR meter demonstrated that the incorporation of rGO up to 0.04 g significantly enhanced the conductivity, achieving a value of 0.013 S/cm. Furthermore, photovoltaic performance testing of dye-sensitized solar cells (DSSC) indicated that the highest efficiency of 1.03% was attained with the PGE containing 0.04 g of rGO.
Synthesis and Characterization of NaOH-Doped ZnO Metal Oxide Thin Films for Electron Transport Layer in Dye-Sensitized Solar Cells (DSSCs) W. S. Arsyad; H. A. Hangkea; I. Saleh; I N. Sudiana; L. Agusu; I. Usman
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.30

Abstract

Research on the manufacture of ZnO thin films as electron transport layers has been carried out. The ZnO coating was prepared by sol-gel method. At the time of making the solution precursor, the doping given was 0.72%, 1.09%, and 1.45% by weight. Each hkl index changes at an angle of 2θ which causes the mean crystal size to decrease from 57.57 nm, 35.94 nm to 24.01 nm for doping concentrations of 0.72%, 1.09% and 1.45%, respectively. The measurement results using the LCR meter show that the resistance of the ZnO thin layer increases with the addition of NaOH doping from 125.49 Ω.cm, 462.93 Ω.cm and 3192.8 Ω.cm for doping are 0.72%, 1.09% and 1.45% NaOH respectively. The results of the analysis of the UV-Vis spectrometer, the slit energy value decreased with the increase in the doping of NaOH given, namely 2.03 eV, 2.026 eV, 2.025 eV and 2.024 for samples without doping are 0.72%, 1.09% and 1.45% sequentially. The results of the morphological analysis using SEM showed that the grains with sizes and shapes tended to be the same in all thin film samples.
Adoption of Computational Response Surface Methodology (RSM) in Asphalt Research I W. Sutapa; Hikmayani; G. R. Lempang; L. O. Kadidae; I N. Sudiana; A. Bandjar
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.34

Abstract

Response Surface Methodology (RSM) is a powerful statistical and computational tool used to model and optimize complex systems involving multiple variables and responses. In asphalt research, RSM has gained significant attention for its efficiency in optimizing mix design, evaluating modified asphalt properties, and analyzing the effects of processing and environmental conditions. This review highlights the application of RSM in key aspects of asphalt studies, including experimental design (CCD, BBD, factorial), mathematical modeling, response visualization, and multi-response optimization. The use of RSM enables researchers to identify optimal binder content, additive dosage, and process conditions with reduced experimental effort. Additionally, the integration of RSM with contour and 3D surface plots provides intuitive understanding of parameter interactions. Despite its advantages, RSM faces limitations such as model assumptions, sensitivity to data distribution, and challenges in field validation. Future research is encouraged to combine RSM with artificial intelligence techniques for more robust predictions and to validate laboratory models under real-world conditions. Overall, RSM remains a valuable methodology for advancing asphalt technology, especially in the development of sustainable and high-performance pavement materials.  
Co-Authors A. Bandjar A. Bandjar A. J. Muhammad A. Kamari A. M. R. Akqadri A. Ndita A. Zaeni Al Jalali Muhammad Anas M. Andi Tendri Ampa Ashari Midana Asmijar Nurlette Budiman, Herdi C. Baskar D.K. Sutiari E. Safitri Edi Cahyono Endang S, Prima F. Nishimura F. S. Palobang Faiz Jaya Angkasa Fitriani Fuadah, Badrotul G. R. Lempang G.E. Sandra H. A. Hangkea H. Kikuchi H. Tehubijuluw Hikmayani I P. A. Karya I W. Sutapa I W. Sutapa I. S. Ely I. Saleh I. Saleh I. Usman IDA USMAN Ismail Saleh Ismail Saleh Israyani J. Wulandari Jahiding M. K. Nakagawa Katsuide Sakob, Katsuide Koedoes, Y.A. L Agusu L. Agusu L. Ardan L. Arfad L. Lestari L. Lestari L. Lestari L. O. Kadidae L. O. Kadidae L. O. M. Darusman L. O. M. Salam L. O. Rusman L. Rusman La Aba La Aba La Aba La Agusu La Agusu La Agusu La Agusu La Ode Rusman La Ode Rusman Lina Lestari Lina Lestari M. A. Mahfud M. Jahiding M. Zamrun F M. Zamrun F. M.Z. Firihu Melani Muh Zamrun Firihu Muh. Jasman Jamal Muhammad Anas Muhammad Arohman Muhammad Jahiding Hafid Muhammad Kabil Djafar Muhammad Zaeni, Muhammad Muhammad Zamrun Muhammad Zamrun F Muhammad Zamrun Firihu Muhammad Zamrun Firihu Ni Putu Sri Widiasih Nur, Adrian Rahmat P. Endang S P.A. Setyo P.E. Susilowati Prima Endang Susilowati R. Riwasa S. Mitsudo S. Raharjo Sapto Raharjo Seitaro Mitsudob, Seitaro Shunsuke Inagakib, Shunsuke T. Asano T. Iwamoto T. Nishiumi Trisnawati Trisnawati W. D. Triandari W. O. Sukmawati W. S. Arsyad W. S. Arsyad W. S. Arsyad Wa Ode Riniastuti Wa Ode Sitti Ilmawati Waode Sukmawati Arsyad Wayan Trimawiasa Y. Biringgalo Y. Milen Y. Terui Yumna Wati