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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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Journal : JOURNAL ONLINE OF PHYSICS

 1 
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.
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.
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 Ni Luh Putu Trisnawati Novita Kundiman Puni, M S Rofiqul Umam Steven Iwamony Tuny, Margaretha Tabita