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All Journal BERKALA FISIKA Indonesian Physical Review Jurnal Abdi Insani BULETIN FISIKA
Armynah, Bidayatul
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Agriculture, Biological Sciences & Forestry Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics

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PENGARUH SUHU KARBONISASI TERHADAP SIFAT FISIS DAN KIMIA KARBON AKTIF DAUN JERUK PURUT (CYTRUS HYSTRIX DC) UNTUK SEL SUPERKAPASITOR Madani, Husain Ahmad; Armynah, Bidayatul
BERKALA FISIKA Vol 28, No 1 (2025): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Superkapasitor atau Electrochemical Double Layer Capacitor (EDLC) adalah perangkat elektrokimia dengan rapat daya tinggi, siklus daya panjang, serta kemampuan pengisian dan pengosongan yang cepat. Penelitian ini berfokus pada pemanfaatan daun jeruk purut (Citrus hystrix DC) sebagai bahan karbon aktif untuk elektroda sel superkapasitor dengan kandungan lignoselulosa (hemiselulosa 28,40%, selulosa 25,60%, dan lignin 9,40%). Karbon aktif dihasilkan melalui aktivasi kimia menggunakan KOH 0,3M diikuti karbonisasi pada suhu 650°C, 700°C, dan 750°C dengan gas N₂, serta aktivasi fisika menggunakan gas CO₂ pada suhu 800°C. Hasil karakterisasi menunjukkan bahwa peningkatan suhu karbonisasi memengaruhi sifat fisis dan elektrokimia karbon aktif. Analisis FTIR menunjukkan degradasi gugus organik dan pembentukan struktur karbon berpori, sedangkan analisis XRD mengindikasikan transisi struktur kristalin menjadi amorf. Nilai massa jenis elektroda menurun seiring peningkatan suhu karbonisasi, memungkinkan terbentuknya pori-pori yang mendukung peningkatan kapasitansi. Hasil cyclic voltammetry menunjukkan kapasitansi spesifik tertinggi sebesar 107,75 F/g pada suhu karbonisasi 700°C, dibandingkan dengan 71,50 F/g dan 74,75 F/g masing-masing pada suhu 650°C dan 750°C. Penelitian ini membuktikan bahwa karbon aktif berbasis daun jeruk purut memiliki potensi tinggi sebagai elektroda sel superkapasitor, dengan suhu karbonisasi optimal pada 700°C.
PENGARUH AKTIVASI ZnCl2 TERHADAP SIFAT FISIS DAN ELEKTROKIMIA ELEKTRODA KARBON DAUN PRASMAN (EUPOTORIUM TRIPLINERVE V) SEBAGAI SEL SUPERKAPASITOR Nahda, Nidia; Armynah, Bidayatul
BERKALA FISIKA Vol 28, No 1 (2025): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Energi terbarukan menciptakan sejumlah listrik dengan variasi yang berbeda dan sulit diprediksi. Penetrasi yang luas ini dilakukan sebagai cara untuk menghemat energi. Salah satu faktor utama yang telah mendorong kemajuan pesat dalam sistem elektrokimia adalah pengembangan dua perangkat penting, yaitu baterai dan superkapasitor. Penelitian ini pembuatan karbon aktif dari daun prasman melalui proses karbonisasi pada suhu 600°C selama 1 jam dengan variasi aktivasi ZnCl2 0,1 M, 0,2 M dan 0,3 M.  Kerakteristik yang dilakukan meliputi analisis densitas, Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), dan Cyclic Voltammetry (CV). Hasil anasis densitas menunjukkan bahwa setiap pertambahan aktivasi, nilai massa jenis yang dihasilkan mengalami penurunan. Gugus fungsi spektrum FTIR memperlihatkan adanya ikatan C yang terbentuk. Analisis XRD menunjukkan adanya struktur amorf baik sebelum maupun sesudah pirolisis.  Sifat elektrokimia dari karbon daun prasman menunjukkan bahwa proses difusi yang berlangsung semakin baik seiring tinggi aktivator. Nilai kapasitansi spesifik elektroda sel superkapasitor daun prasman diperoleh hasil kapasitansi spesifik tertinggi terdapat pada aktivator 0,2 M yaitu 102,15 F/g.
PELATIHAN PENGGUNAAN SIMULATOR WOKWI UNTUK MENINGKATKAN PEMAHAMAN KONSEP FISIKA BERBASIS STEM Laila, Ida; Armynah, Bidayatul; Arifin, Arifin
Jurnal Abdi Insani Vol 12 No 7 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i7.2685

Abstract

Pemahaman siswa terhadap konsep fisika sering kali terbatas akibat metode pengajaran konvensional yang kurang interaktif, sehingga minat terhadap mata pelajaran ini cenderung menurun. Untuk mengatasi permasalahan tersebut, Departemen Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Hasanuddin dalam rangka pelaksanaan Pengabdian kepada Masyarakat menyelenggarakan pelatihan penggunaan simulator Wokwi bagi siswa di SMA Negeri 2 Polewali. Kegiatan ini bertujuan untuk meningkatkan pemahaman konsep fisika berbasis STEM (Science, Technology, Engineering, and Mathematics) melalui pembelajaran berbasis teknologi yang lebih interaktif dan aplikatif. Program dilaksanakan dalam empat tahap, yakni asesmen kebutuhan, persiapan materi dan alat, pelaksanaan interaktif dengan praktik langsung tiga proyek Wokwi, serta evaluasi melalui pre-test, post-test, dan survei kepuasan peserta. Hasil evaluasi melalui pre-test dan post-test menunjukkan adanya peningkatan pemahaman konsep fisika berbasis STEM dari 73,8% menjadi 90,48%, serta minat belajar fisika dari 40,5% menjadi 83,33%. Sebanyak 83,33% peserta merasa puas, dan 95,24% menyatakan bahwa simulator Wokwi membantu memahami hubungan fisika dan teknologi. Data ini menunjukkan bahwa pendekatan berbasis simulator Wokwi tidak hanya meningkatkan pemahaman konsep, tetapi juga mendorong keterlibatan aktif siswa dalam pembelajaran fisika. Dengan demikian, pelatihan ini dapat menjadi model pembelajaran inovatif berbasis STEM yang efektif dalam meningkatkan kualitas pembelajaran fisika di sekolah.
INTERNET OF MEDICAL THINGS (IoMT)-BASED HEART RATE AND BODY TEMPERATURE MONITORING SYSTEM Laila, Ida; Arifin, A; Armynah, Bidayatul
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.134

Abstract

Research has been carried out on a heart rate and body temperature monitoring system based on the Internet of Medical Things (IoMT). This study aims to create a system for monitoring heart rate and body temperature remotely in real-time with measurement results displayed on a web server. This research includes several methods such as developing research concepts based on literature studies, system design consisting of hardware and software design, sensor calibration, web server creation, system testing, and direct data retrieval. The hardware manufacturing stage uses several components such as a pulse heart sensor to detect heart rate, DS18B20 sensor to detect body temperature, Arduino Uno microcontroller, Xbee end device, Xbee coordinator, and raspberry pi as a server computer. Then for the use of software on this system, it consists of Arduino Integrated Development Environment (IDE) to run Arduino Uno hardware, XCTU to provide configuration on Xbee, Python to run Raspberry Pi and Django as a framework for building web servers and MySQL as data storage center measurement results. Heart rate monitoring is done by placing a sensor on one of the fingers, and body temperature is done by placing the sensor in the axilla. The output from the sensor in the form of analog data is converted by the Arduino Uno microcontroller into digital data and then sent to the Raspberry Pi module via Xbee. The raspberry pi has processed data is then stored in the database and then displayed on the webserver. The sensor calibration results show that the pulse heart sensor's error rate is 0.41%, and the DS18B20 temperature sensor is 1.09%. After calibration of the sensor, data was collected on the three respondents' heart rate and body temperature. The measurement results show that the system can store each respondent's heart rate and body temperature data in the database and display the measurement results on the webserver in real-time. Based on these results indicate that the system that has been made can work well.
PHOTOINACTIVATION OF CANDIDA ALBICANS BIOFILM WITH GREEN LASER MEDIATED BY THE PAPAYA LEAF EXTRACT CHLOROPHYLL Abdullah, Rismayani; Astuty, Sri Dewi; Armynah, Bidayatul; Tabaika, Pryandi M; Imelda, Imelda
Indonesian Physical Review Vol. 8 No. 1 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i1.367

Abstract

This study aims to activate the effectiveness of Photodynamic Inactivation (PDI) as an antibacterial agent by using a green laser and papaya leaf chlorophyll extract to prevent Candida albicans cell death. Papaya leaf extract chlorophyll is known to have potential as a photosensitizer (PS) through its antimicrobial properties and ability to absorb optimal light photons at a wavelength range of 405–680 nm. Activation of chlorophyll molecules with appropriate light produces Reactive Oxygen Species (ROS), which are toxic to pathogenic microbes such as Candida albicans. The research method involves using PDI with a green laser light source and chlorophyll extract on Candida albicans biofilms. Four main treatment groups were applied, negative control (C-), positive controls with 10% (C1+) and 15% chlorophyll (C2+), irradiation for 60, 120, 180, 240, and 300 seconds (L1–L5), and combinations of irradiation with chlorophyll (L1F1–L5F2, where F1 for 10% chlorophyll and F2 for 15% chlorophyll), with measurements performed three times for each treatment. Living Candida albicans cells were detected using the XTT assay staining method. The results showed a significant decrease in activity in all treatment groups. Maximum activity was achieved in the L5F1 and L5F2 treatment groups with inactivation of 80% (p<0.05) and 83% (p<0.05), respectively. This study concludes that high papaya leaf extract chlorophyll concentrations combined with a green laser effectively inhibit Candida albicans biofilm.
Synthesis and Characterization of Activated Carbon from Jackfruit Banana (Musa paradisiaca L.) Leaves as Supercapacitor Electrode Material Uliana, Satria Ulia; Armynah, Bidayatul; Kala’Tagari, Emar Mokiman
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p01

Abstract

A study was conducted to determine the maximum carbonization temperature for producing activated carbon derived from banana leaves (Musa paradisiaca L.) as electrode material for supercapacitors with KOH activation. Activated carbon was prepared using a chemical activation method with 0.5 M KOH at carbonization temperatures of 750, 800, and 850 °C under a CO₂ atmosphere. Thermogravimetric (TG) and Derivative Thermogravimetric (DTG) analyses revealed the highest thermal degradation rate at 313.3 °C, indicating the temperature range with the most rapid mass loss. Density analysis showed that the density of activated carbon decreased with increasing carbonization temperature. Fourier Transform Infrared (FTIR) characterization confirmed the presence of carbon bonds, while X-Ray Diffraction (XRD) patterns indicated a mixed amorphous–semi-crystalline structure. Scanning Electron Microscopy (SEM) analysis revealed a surface morphology with more uniformly distributed and open pores, indicating enhanced pore development with increasing carbonization temperature. Energy Dispersive X-ray Spectroscopy (EDS) confirmed the dominance of potassium, accounting for 73.77 wt% and 49.80 at%. Electrochemical evaluation showed that the specific capacitance exhibited only slight variations across the tested carbonization temperatures, with the highest value of 209 F/g obtained at 850 °C. These results indicate that 850 °C is the maximum carbonization temperature to produce high-performance activated carbon from banana leaves, reinforcing its potential as a sustainable material for supercapacitor applications.
Co-Authors Abdullah, Rismayani Arifin Arifin Arifin, A Kala’Tagari, Emar Mokiman Laila, Ida Madani, Husain Ahmad Nahda, Nidia Sri Dewi Astuty Ilyas Tabaika, Pryandi M Uliana, Satria Ulia