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All Journal Jurnal Pendidikan Fisika Undiksha Jurnal Sains dan Teknologi JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI BULETIN FISIKA JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX International Journal of Community Service Learning Indonesian Physical Review
I Putu Tedy Indrayana
Program Studi Fisika Universitas Udayana Bali
Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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ANALISIS PARAMETER MIKROSTRUKTUR NANOPARTIKEL Mn1-xZnxFe2O4 BERDASARKAN POLA DIFRAKSI SINAR X Indrayana, I Putu Tedy
JST (Jurnal Sains dan Teknologi) Vol 8, No 1 (2019)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1488.068 KB) | DOI: 10.23887/jst-undiksha.v8i1.13016

Abstract

The Mn-Zn Ferit is a magnetic material which has potential applications for data storage device, the inductor coil and catalysis. This material has unique electrical and optical properties. Their properties are microstructural dependent. In this work, we studied the microstructural parameters of Mn1-xZnxFe2O4 which x assigns the mole fraction of Mn2+ and Zn2+ (x = 0.6; 0.7 and 0.8). Samples were synthesized by using coprecipitation method and NaOH as a coprecipitant. Microstructural parameters were investigated based on X-ray diffraction pattern. The crystallite size and strain were determined by using Size-strain plot (SSP) method. The crystallite size of nanoparticles is in a range of 18.9 nm – 24.8 nm, while the strain is in a range of 0.0012 – 0.0099. The lattice parameter is in a range of 8.531Ǻ - 8.567Ǻ bigger than the values were calculated theoretically according to the theoretical cation distribution model. The cation distribution in crystal lattice takes important rule in determining the microstructural parameters of nanoparticles. 
Peningkatan Kualitas Produksi Ikan Asap di Rumah Produksi Kampung Rawa Jaya Tobelo Melalui Inovasi Alat Pengasapan Ikan Sari Waruna Indrayana, I Putu Tedy; Puni, M S; Manumpil, A; Huragana, Y M
International Journal of Community Service Learning Vol 4, No 1 (2020): February 2020
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1080.337 KB) | DOI: 10.23887/ijcsl.v4i1.24433

Abstract

This community service aims to provide innovation in the fish smokehouse in Rawa Jaya Tobelo. The target of this activity is to be able to improve the quality of smoked fish production and packaging so that it has the potential to increase the selling value of the product. This activity was carried out for 5 months by implementing a collaborative strategy between the service team and the partner community. The focus of this service is (1) manufacturing "Sari Waruna" smokehouse and (2) technical product packaging assistance. "Sari Waruna" smokehouse was successfully built within 3 weeks. This activity has succeeded in developing the "Sari Waruna" smokehouse which has a production capacity of 100 smoked fish. Fumigation only lasts for 3 hours so it is more fuel-efficient. The texture of the meat from the smoked fish is tastier, the color is bright reddish-brown and clean. Smoked fish can last for 4 days. The packaged smoked fish has the potential to be marketed out of Tobelo. The partner community responded positively to this community service activity because it supported the development of smoked fish business going forward.
PARTICLES SIZE AND LATTICE STRAIN EFFECT ON THE OPTICAL CONSTANTS OF Fe3O4 NANOPARTICLES I Putu Tedy Indrayana; Margaretha Tabita Tuny
Indonesian Physical Review Vol. 4 No. 1 (2021)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v4i1.71

Abstract

In the case of optical sensors such as the Surface Plasmon Resonance (SPR) sensor, the Fe3O4 nanoparticles play a role to boost the signal however they can increase the detection sensitivity of the biosensor. For this application, the optical properties of Fe3O4 nanoparticles need to be studied. The optical properties are described in terms of their optical constants. Therefore, this work was purposed to study the effect of the particle size and lattice strain on the optical constants of Fe3O4 nanoparticles. Samples were synthesized by using the coprecipitation technique. Two calcination temperatures, i.e., 150oC and 250oC for 4 hours were applied to the samples. Samples were characterized for their diffraction pattern and optical properties by using XRD and Specular UV-Vis Spectroscopy technique, consecutively. The particle size and lattice strain were estimated by using the Williamson-Hall (W-H) method. The effect of the particle size and their optical constants on the reflectance curve in the SPR sensor application was also performed toward a simulation by using Winspall 3.02 software. The results show that calcination temperature causes an increase in particle size and a decrease in lattice strain. The optical constants, such as absorbance (A), absorption coefficient (α), extinction coefficient (k), refractive index (n), dielectric constants (ε), optical conductivity (σ), and the Urbach energy (Eu) significantly depended on particles size and lattice strain. However, the particle size and optical constant were significantly influent the SPR angle in the reflectance curve of Fe3O4
A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION I Putu Tedy Indrayana
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8166

Abstract

This work was aimed at optimizing the microstructure and optical properties of Fe3O4 by variation of synthesis temperature and NaOH concentration. The nanoparticles have been synthesized from iron sand by using the coprecipitation method. The temperature was varied of 60oC, 80oC, and 100oC, while NaOH concentration was 3 molar, 5 molar, and 7 molars. The microstructural parameters were characterized by using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques. The optical properties were characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and UV-Vis Spectroscopy, consecutively. The results showed that the crystallite size of Fe3O4 increase with an increase of synthesis temperature due to higher thermal energy driving the nucleation process. The crystallite sizes are in the range of 3.77 nm – 20.37 nm. Increasing NaOH concentration also affected the increase in crystallite sizes. On the other hand, an excess of NaOH concentration influences the formation of smaller crystallite sizes of Fe3O4 with smaller crystal density and larger microstrain. The existence of Fe2+-O and Fe3+-O vibration in FTIR spectra confirmed the formation of Fe3O4 nanoparticles. The direct and indirect optical gap energies of Fe3O4 were in the range of 3.15 eV – 3.39 eV and 2.39 eV – 2.91eV. The synthesis temperature and NaOH concentration have a significant role in controlling the properties of Fe3O4.
SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF Fe3O4 NANOPARTICLES AS A SIGNAL AMPLIFIER ELEMENT IN SURFACE PLASMON RESONANCE BIOSENSING I Putu Tedy Indrayana
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 2 (2020): JOP (Journal Online of Physics) Vol 5 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i2.8259

Abstract

The Fe3O4 nanoparticle has potential applications to be active materials for biosensor. This research was aimed at synthesizing and applying Fe3O4 nanoparticles for signal amplification of Surface Plasmon Resonance (SPR)-based biosensor. The synthesis was carried out by using the coprecipitation method at a temperature of 80oC for 60 minutes. NaOH of 5 molars was used as a precipitating agent. The Fe3O4 nanoparticles were characterized for their microstructure by using X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) techniques. The crystallinity of nanoparticles is 87% and the crystallite size is 15.70 nm. The shape of Fe3O4 is nearly spherical. The optical properties were characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and Specular Reflection UV-Vis Spectroscopy (SR UV-Vis). There were vibrations of Fe3+-O and Fe2+-O bonds at characteristic frequencies of 586.86 cm-1 and 422.64 cm-1. The direct and indirect optical gap energies were 3.43 eV and 3.10 eV. The magnetic properties measured by Vibrating Sample Magnetometer (VSM) confirmed that Fe3O4 was ferrimagnetic. The Fe3O4 was successful to be applied as a signal amplifier for SPR-based biosensors due to their optical and magnetic properties. The SPR angle shifted to a higher value and the change was 3.57o.
IMPROVING STUDENTS’ ACTIVITY AND CONCEPTUAL UNDERSTANDING BY AN IMPLEMENTATION OF PHYSICS INTERACTIVE MULTIMEDIA-ASSISTED GROUP INVESTIGATION MODEL Gusti Ayu Rai Tirta; I Putu Tedy Indrayana
Jurnal Pendidikan Fisika Undiksha Vol. 12 No. 1 (2022)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpf.v12i1.46521

Abstract

Conceptual understanding is the main competency that must be possessed by students when participating in physics learning. This study aims to improve students' learning activity and conceptual understanding of physic in class XA Pharmacy at SMK Bintang Persada Denpasar on the subject of Elasticity and Static Fluid through online group investigation. This learning uses PhIMP (Physics Interactive Multimedia Packaging). PhIMP-assisted online group investigation is unique because students learn comprehensively and deeply about basic physics concepts through online experimental activities, group discussions, and online presentations. This research was a classroom action research that involved 31 students. It was implemented in two cycles. Student’s learning activity and conceptual understanding is a variable studied. The instruments used a conceptual understanding test that consists of 30 items and a learning activity observation sheet. The data were collected using pre-test and post-test technique in each learning cycle. The results indicate that there is an increase in student learning activities from cycle I to cycle II. The average score of student learning activities for the cycle I and cycle II were 35.5 and 48.5, respectively. There is an improvement in student’s conceptual understanding. The N-gain scores in cycle I and cycle II were 0.39 and 0.71. There is also an improvement in the dimensions of conceptual understanding abilities. These results indicate that theinteractive multimedia-assisted group investigation model is powerful to facilitate students in improving their activity and conceptual understanding.
Identifikasi sebaran dan Jenis Sesar Berdasarkan Analisis Data Anomali Gravitasi Topex Provinsi Maluku Utara Lembar Pulau Halmahera Utara Bayu Achil Sadjab; I Putu Tedy Indrayana; Kurnia Kurnia; Khafidh Nur Aziz; Adrian Rahmat Nur; Harsen Berg Janis; Hanny F. Sangian
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 19, No 2 (2022): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2649.965 KB) | DOI: 10.20527/flux.v19i2.9616

Abstract

Provinsi Maluku Utara terutama pulau Halmahera dan sekitarnya merupakan bagian dari kerangka sistem tektonik Indonesia yang kompleks dan memiliki aktifitas tektonik yang tinggi. Daerah ini berada pada zona pertemuan lempeng Eurasia, lempeng Pasifik, lempeng Indo-Australia dan lempeng-lempeng kecil lainnya seperti lempeng Filipina. Sebagai akibat dari geodinamika maka daerah penelitian merupakan daerah dengan aktivitas seismisitas yang cukup tinggi, dimana faktor utamanya karena terdapat banyak struktur geologi berupa antiklin, sinklin, sesar naik, sesar mendatar dan sesar normal akibat aktivitas lempeng di daerah ini. salah satu metode yang dapat digunakan untuk mengidentifikasikan sesar dan jenisnya adalah metode gravitasi, pada penelitian ini data yang digunakan adalah data observasi gravitasi satelit Topex dengan Luasan area penelitian adalah 3.891,62 km2 dalam bentuk Free Air Anomaly (FAA), yang kemudian dikoreksi bouguer dan koreksi medan menghasilkan Anomali Bouguer lengkap (ABL). Anomali regional dan residual menunjukkan korelasi yang baik dengan peta geologi daerah penelitian dalam mendeliniasi sebaran sesar dengan rentang nilai anomali positif (± 187 mGal) dan anomali negatif (± -14.8 mGal). Analisis anomali SVD menunjukkan sebaran sesar di daerah penelitian adalah jenis sesar turun atau sesar normal.
Determination of the Optical Band gap Energy from the Extraction and Evaporation of Anthocyanin Compound Sea Lettuce (Ulva Lactuca L.) Using Tauc Plot Method Fiar Tri Santika; Hery Suyanto; Ni Luh Putu Trisnawati; I Putu Tedy Indrayana
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
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.2024.V25.i01.p02

Abstract

The optical energy gap of anthocyanin compounds from sea lettuce extract (Ulva lactuca L.) has been calculated using the Tauc plot method. Sea lettuce plants taken at Sanur Beach Bali. The sea lettuce was dried then mashed and extracted for 24 hours, the last being macerated through three cycles. The extraction results are then evaporated to obtain a thick extract solution. Extracted and evaporated-extraction samples were characterized by UV-Vis in the wavelength range of 200-800 nm. From the characterization results, it was found that the absorption of anthocyanin compounds for the extracted samples was at a wavelength of 268 and 412 nm. Meanwhile, for the extraction-evaporation sample, the absorption is at a wavelength of 286.5 and 408 nm. By using the Tauc plot method, the optical energy gap values ??for the extracted and extraction-evaporated samples were 2.69 and 2.54 eV, respectively. Therefore, anthocyanin compounds from both extracted and evaporation-extracted samples qualify as dye sensitized solar cells (DSSC) for TiO2 semiconductors.
PENGARUH VARIASI SUHU KALSINASI TERHADAP PARAMETER MIKROSTRUKTUR (STURKTUR KRISTAL DAN GUGUS FUNGSI) NANOPARTIKEL TIO2 SEBAGAI KANDIDAT MATERIAL FOTOKATALISIS Novita Kundiman; Kurnia Kurnia; I Putu Tedy Indrayana; Bayu Achil Sadjab
JOURNAL ONLINE OF PHYSICS Vol. 8 No. 3 (2023): JOP (Journal Online of Physics) Vol 8 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v8i3.26814

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh suhu kalsinasi terhadap parameter mikrostruktur nanopartikel TiO2. Nanopartikel TiO2 masing-masing ditimbang dengan massa 1 gram dan dikalsinasi pada suhu 150 oC, 200oC, 250 oC dengan waktu 3 jam setiap suhu. Powder nanopartikel TiO2 yang telah dikalsinasi selanjutnya dikarakterisasi dengan menggunakan alat XRD untuk mengengetahui parameter mikrostrukturnya. Kemudian, untuk mengetahui gugus fungsi nanopartikel TiO2 dapat dikarakterisasi dengan spektra Transformasi Fourier Inframerah (FTIR). Karakterisasi yang dihasilkan oleh XRD berupa pola difraksi yang menunjukan telah terbentuknya fasa TiO2 yang memiliki struktur kristal tetragonal dengan parameter kisi kristal a bernilai a= 3,782 Å - 3,784 Å dan parameter kisi c bernilai c = 9,500 Å - 9,509 Å . Nilai tersebut mendekati nilai parameter kisi TiO2 sesuai referensi, yaitu 3,785 Aͦ untuk a dan 9,514 Aͦ untuk c (JCPDS 21-1272). Ukuran kristalit (t) berada pada kisaran nilai 22,99 (nm)-24,39 (nm) dan kerapatan dislokasi kristal (D) berada pada kisaran nilai 1,679 nm-2 x10-3 – 1,892 nm-2 x10-3. Sedangkan kerapatan kristal berada pada kisaran nilai yaitu 3,897gram/cm3 – 3,903 gram/cm3 dan Spektra FTIR memberi informasi terjadinya vibrasi gugus Ti – O – Ti berada pada interval bilangan gelombang 505 cm-1 – 600 cm-1 dengan vibrasi stretching. Gugus fungsi Ti – O berada pada interval bilangan gelombang 610 cm-1 – 1000 cm-1 vibrasi stretching. Pada interval bilangan gelombang 1700 – 3600 cm-1 vibrasi bending. Dalam Mengoptimalkan parameter mikrostruktur sebagai material fotokatalis, bahan nanopartikel TiO2 dapat dilakukan dengan mengkontrol suhu kalsinasi.
Peningkatan Kualitas Produksi Ikan Asap di Rumah Produksi Kampung Rawa Jaya Tobelo Melalui Inovasi Alat Pengasapan Ikan Sari Waruna Indrayana, I Putu Tedy; Puni, M S; Manumpil, A; Huragana, Y M
International Journal of Community Service Learning Vol. 4 No. 1 (2020): February 2020
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1080.337 KB) | DOI: 10.23887/ijcsl.v4i1.24433

Abstract

This community service aims to provide innovation in the fish smokehouse in Rawa Jaya Tobelo. The target of this activity is to be able to improve the quality of smoked fish production and packaging so that it has the potential to increase the selling value of the product. This activity was carried out for 5 months by implementing a collaborative strategy between the service team and the partner community. The focus of this service is (1) manufacturing "Sari Waruna" smokehouse and (2) technical product packaging assistance. "Sari Waruna" smokehouse was successfully built within 3 weeks. This activity has succeeded in developing the "Sari Waruna" smokehouse which has a production capacity of 100 smoked fish. Fumigation only lasts for 3 hours so it is more fuel-efficient. The texture of the meat from the smoked fish is tastier, the color is bright reddish-brown and clean. Smoked fish can last for 4 days. The packaged smoked fish has the potential to be marketed out of Tobelo. The partner community responded positively to this community service activity because it supported the development of smoked fish business going forward.
Co-Authors Adrian Rahmat Nur Bayu A. Sadjab Edi Suharyadi Ferni Malega Fiar Tri Santika Gusti Ayu Rai Tirta Hanny F. Sangian Harsen Berg Janis Hery Suyanto Huragana, Y M Iwamony, Steven Khafidh Nur Aziz Kurnia Kurnia Malega, Ferni Malega, Ferni Manumpil, A Margaretha Tabita Tuny Ni Luh Putu Trisnawati Novita Kundiman Puni, M S Rofiqul Umam Steven Iwamony