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All Journal MAKARA of Science Series Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Jurnal Teknologi Proceeding of the Electrical Engineering Computer Science and Informatics INDONESIAN JOURNAL OF APPLIED PHYSICS JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS Jurnal Fisika Indonesia Indonesian Journal of Electrical Engineering and Computer Science
Kamsul Abraha
Department of Physics, Gadjah Mada University, Yogyakarta
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Kajian Pengaruh Lapisan Nanopartikel Cobalt Ferrite (CoFe2O4) Terhadap Pergeseran Sudut Surface Plasmon Resonance (SPR) Menggunakan Konfigurasi Kretschmann-Perak Termodifikasi Di Bawah Pengaruh Medan Magnet Luar Mayasari, Rina Dewi; Nuryadi, Ratno; Suharyadi, Edi; Abraha, Kamsul
Jurnal Fisika Indonesia Vol 20, No 1 (2016)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1072.139 KB) | DOI: 10.22146/jfi.27914

Abstract

Pergeseran sudut surface plasmon resonance (SPR) pada konfigurasi Kretschmann-perak termodifikasi oleh nanopartikel cobalt ferrite (CoFe2O4) telah dikaji secara eksperimen di bawah pengaruh medan magnet. Tiga sampel nanopartikel CoFe2O4 dengan ukuran partikel yang berbeda, yaitu 1,68 nm untuk sampel A; 1,95 nm untuk sampel B; dan 5,87 untuk sampel C, disintesis dengan metode kopresipitasi. Pendeposisian tiga sampel menggeser sudut SPR referensi (prisma/Ag) dengan nilai yang berbeda-beda, yaitu sebesar 0,10°; 0,10°; dan 0,30°, dengan ketidakpastian masing-masing sebesar ±0,05° untuk sampel A, B, dan C secara berturut-turut. Setelah dikenai medan magnet luar,sudut SPR bergeser lagi sejauh 0,30° untuk sampel A dan B, dan 0,5° untuk sampel C, dengan ketidakpastian masing-masing sebesar ±0,05°. Selain itu, perbedaan dua arah medan magnet terkonfirmasi bahwa pergeseran sudut SPR memiliki nilai yang berbeda, yaitu 0,3°±0,05° dan 0,6°±0,05°. Respon nanopartikel CoFe2O4 pada pergeseran sudut SPR memberikan potensi sebagai smart materials pada sistem SPR
Purity Testing of Cultivar Melon DNA Level (Cucumis melo L.) “Gama Melon Basket” using Surface Plasmon Resonance (SPR) Based on Silver Nanoparticle T, Thoyibi; Arifin, Muhammad; Abraha, Kamsul
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 5, No 01 (2015): IJAP Volume 05 Issue 01 Year 2015
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v5i01.254

Abstract

DNA level of purity has been tested by observing the phenomenon of surface plasmon resonance (SPR) in silver film + silver (Ag) nanoparticles system as DNA sensor using Kretschmann configuration. Surface plasmon resonance (SPR) phenomenon observed in the resonance condition of reflectance spectrum vary with incident angle of laser, beamed toward prism. System is built as a model for DNA purity test instrument that give higher accuracy. DNA purity testing was conducted by placing DNA layer with various ratio on prism in order to get the angle shift value in each sample as a result. Purity level of DNA indicates the DNA quality based on the ratio between the amount of pure DNA compared to the amount of impurity materials (protein). After the deposition of DNA in ratio 1,774, 1,838 and 1,916 SPR angle shifted ,  and  respectively. Characteristic differences of DNA with different purity (ratio) are shown by reflectance value that is getting higher at a smaller ratio, indicates that in the higher DNA ratio the angle shift is getting smaller. SPR angle shift which is occurred before and after DNA deposition shows the sensitivity of SPR as DNA sensor.
The Dopan Influence to Electrical Properties of Nanofibre Polyaniline Synthesize by Interfacial Polymerization Ketut Umiati, Ngurah Ayu; Rajabiah, Nurlaila; Triyana, Kuwat; Abraha, Kamsul
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.054 KB) | DOI: 10.11591/eecsi.v1.410

Abstract

The study observed the effect of variations in the electrical properties of dopants molarity polyaniline nanofiber. Polyaniline nanofiber in this study is synthesized by the interfacial polymerization method in Toluene Aniline 0.31 with the APS 4mmol dopant HCl solution with molarity between 0.6 M to 2.4 M. The synthesis results obtained were characterized by Scanning Electron Microscope. The electrical property is also observed on the polyaniline nanofiber. The results of this study indicate that the increase in molarity of dopants affect the incremental conductivity and diameter of fiber of the material.
Kajian Pengaruh Nanopartikel Magnetik Fe3O4 Pada Deteksi Biosensor Berbasis Surface Plasmon Resonance (SPR) Sihombing, Yuan Alfinsyah; Abraha, Kamsul
Jurnal Ilmu Fisika Vol 9, No 2 (2017): Published in September 2017
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (748.08 KB) | DOI: 10.25077/jif.9.2.121-131.2017

Abstract

Telah dilakukan kajian berkaitan dengan pengaruh nanopartikel Fe3O4 pada deteksi biosensor berbasis  surface plasmon resonance (SPR). Penelitian ini bertujuan untuk melihat penyebab munculnya dip baru atau pergeseran dip ke arah kanan pada kurva ATR (AttenuatedTotalReflection) setelah adanya penambahan nanopartikel magnetik Fe3O4.Sifat magnetik nanopartikel berupa permeabilitas magnet disubstitusikan pada kurva ATR dan sudut SPR terbentuk pada sudut 51,8º; 47,3º; 46,0º dan 45,6º untuk ketebalan perak 10 nm, 20 nm, 30 nm dan 40 nm berturut-turut dengan ketebalan nanopartikel 10 nm.Untuk melihat pengaruh permeabilitas magnet, diplot kurva ATR tanpa permeabilitas magnet. Hasilnya menunjukkan bahwa sudut SPR terbentuk pada sudut yang sama. Sehingga kemunculan dip baru pada panjang gelombang sinar laser 632,8 nm bukan dikarenakan sifat magnetnya. Sifat magnet ini akan muncul pada rentang gelombang mikro. Dengan pendekatan Teori Medium Efektif (TME) Landauer dan Bruggeman untuk sistem empat lapisan prisma/perak/komposit (nanopartikel+udara)/udara, diperoleh kurva relasi dispersi surface plasmon pada angka gelombang ; ;;  dan  untuk variasi fraksi volume  0,1; 0,2; 0,3; 0,4 dan 0,5 berturut-turut mengalami kopling dengan gelombang evanescent. Ini menunjukkan bahwa pergeseran dip muncul dengan pendekatan teori medium efektif Landauer dan Bruggeman. Kata Kunci : Surface Plasmon Resonance (SPR), nanopartikel magnetik Fe3O4,Evanescent, , TME Landauer dan Bruggeman.
THE POTENTIAL OF IRON SAND FROM THE COAST SOUTH OF BANTUL YOGYAKARTA AS RAW CERAMIC MAGNET MATERIALS Rusianto, Toto; Wildan, M. Waziz; Abraha, Kamsul; Kusmono, Kusmono
Jurnal Teknologi Vol 5 No 1 (2012): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Magnet merupakan bahan teknik yang kebutuhannya meningkat seiring dengan meningkatnya perkembangan industri elektronika di Indonesia, akan tetapi kebutuhan magnet di Indonesia masih diimpor dari luar negeri. Sementara bahan baku magnet berupa besi oksida tersedia cukup banyak di Indonesia, salah satunya pasir besi di pantai Selatan Yogyakarta. Pasir besi mengandung sifat magnetik karena adanya mineral magnetite (Fe3O4) berwarna hitam, maghemite ( -Fe2O3), Rutil (FeTiO3), yang besifat magnetik. Mineral magnetit dapat dikembangkan menjadi bahan magnet contohnya untuk pita magnetik, magnet speaker, magnet motor listrik dan lain-lain. Pasir besi di pantai selatan Bantul Yogyakarta berwarna abu-abu kehitaman menunjukan adanya kandungan material magnetik dalam jumlah besar. Hasil pengujian dengan menggunakan magnet, rata-rata 66.32% berat menempel pada magnet, dari hasil tersebut dilakukan pemisahan dengan metode sieving persentase jumlah terbesar sebanyak 32% pada ukuran bukaan <+212 m. Pengujian dilakukan pada pasir yang menempel pada magnet dan hasil sieving pada jumlah terbesar. Hasil karakteristik material magnetik menggunakan Vibrating Sample Magnetometer (VSM), menunjukan saturation magnetisation (Ms) adalah 13,18 emu/gr dan 36,49 emu/gr, magnetik remanen (Mr) 4,15 emu/gr dan 7,95 emu/gr, koersivitas (Hc) 230 Oe dan 186 Oe, suseptibilitas massa ( ).1,45 ×10-4 m3/kg dan 4,31 ×10-4 m3/kg. Hasil uji XRD menunjukan dominasi magnetite dan maghemite pada pasir besi. Berdasarkan kajian tersebut, bahwa pasir pantai Selatan Bantul Yogyakarta merupakan material magnetik. Material mangetik yang terkandung pada pasir pantai memiliki potensi sebagai bahan keramik magnet (MO.xFe2O3).
Influences of Zn Concentration on Dielectric Properties of ZnxNi1-xFe2O4 Magnetic Nanoparticles Edi Suharyadi; Dwi Indah Rahayu; Linda Armitasari; Kamsul Abraha
Makara Journal of Science Vol 22, No 4 (2018): December
Publisher : Directorate of Research and Community Engagement, Universitas Indonesia

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Abstract

Dielectric properties of ZnxNi1-xFe2O4 magnetic nanoparticles (MNPs) with various Zn concentration (x = 0.2-0.8) have been investigated over a wide frequency range 5–120 kHz. Zn-Ni ferrite MNPs have spinel cubic structure. The crystallite size of the sample for x = 0.2 was about 21.5 nm and then decreases by increasing Zn concentration. For sample with x = 0.4 at frequency 20 kHz, the real dielectric constant ( ) was 35.9, imaginary dielectric constant ( ) was 20.4 and loss tangent ( ) was 0.6. Zn concentration would affect to availability of ferrous and ferric ions in the octahedral site which are preferentially occupied by Zn2+ ion. The dielectric constants decrease with increasing frequency. The sample with at x = 0.6 has the highest dielectric on frequency 5 kHz. The maximum AC conductivity ( ) was 1.7 10-4 Ω-1 at 65 kHz observed for concentration x = 0.3. The dielectric constants and conductivity at low frequency are due to the existence of grains boundary while the dispersion in the high frequency region are due to the conducting grains.
Electrical Conductivity of Polyaniline Fiber Synthesized by Interfacial Polymerization and Electrospinning Ketut Umiati, Ngurah Ayu; Abraha, Kamsul; Triyana, Kuwat
Indonesian Journal of Electrical Engineering and Computer Science Vol 5, No 1: January 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v5.i1.pp85-89

Abstract

Polyaniline fiber is a promising biosensor material due to the capability of this material as an effective mediator for electron transfer. The polyaniline in fibre has wider surface to increase the electron transfer. In this work, polyaniline structure synthesized by interfacial polymerization was compared to polyaniline structure obtained from electrospinning to get a better fibre structure. Interfacial polymerization was carried out to form a polymerization between the water phase and the organic phase. The water phase was prepared from dopants, initiator and aquadestilata and the organic phase was was made from toluene as an organic solvent and aniline monomer. Electrospinning was conducted by using a dc high voltage 15 kV and 0.5 mm syringe needle to produce fibers from a melt polymer solution taken from interfacial polymerization. The scanning electro microscope results confimed the formation of polyaniline in structure of fiber. Resistance measurement by using LCR meter showed that polyaniline fiber resulted from electrospinning is more conductive than polyaniline fiber formed by interfacial polymerization method.  
A Review Of The Linear Response Function In Condensed Matter Physics And Their Application In Some Elementary Processes Jihad, Ibnu; Abraha, Kamsul
Jurnal Fisika Indonesia Vol 20, No 3 (2016)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v20i3.56138

Abstract

Linear response theory in quantum theory with its linear response function and its quantization process has been formulated. The relation between the linear response function with its generalized susceptibility, its symmetry properties, and its analyticity has been studied. These properties produce the dispersion relation or Kramers-Kronig relation. The explicit form of the quantum response function and generalized susceptibility also been reviewed. Applications of linear response functions have been described for three elementary processes. The process discussed is the magnetic field disturbance in the magnetic system that generates magnetic susceptibility, and the electric field disturbance in the electrical system that generates electrical conductivity tensor and the ferromagnet Heisenberg that generates its generalized susceptibility.
GIANT MAGNETORESONANCE EFFECT OF NiFe/Ag/ NiFe MULTILAYERS PREPARED WITH DC SPUTTERING TECHNIQUE ON Ag DEPOSITION TIME Mohammad Toifur; Kamsul Abraha; . Ridwan
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Vol 2, No 1 (2009)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/bfi-jifpa.v2i1.232

Abstract

A study on the Giant Magnetoresonance (GMR) effect of NiFe/Ag/NiFe multilayers on  Ag deposition time (tAg) ranging from 1 to 3 minutes has been performed. The study was intended  to obtain the most suitable Ag deposition time to give the largest GMR ratio by using 150 G deposition field in transverse direction of anode-chathde and C substrate temperature during deposition. Several characterizations have been performed  including morphological sample cross section,  microstructure, magnetic properties of the layer, and GMR ratio in an external magnetic field  ranging from -20 up to 20 gauss. The results show that multilayers with tag = 2 minutes displays the largest GMR ratio of 54.87%. The layer has a high level of atomic structure ordering, a large grain size, the highest remanence and the smallest coercive power. The situation is close to Pool’s estimation that the GMR ratio for trilayers of approximately 50%.
Co-Authors . Ridwan Dwi Indah Rahayu Edi Suharyadi Edi Suharyadi Jihad, Ibnu Ketut Umiati, Ngurah Ayu Kusmono Kusmono, Kusmono Kuwat Triyana Linda Armitasari M. Waziz Wildan M. Waziz Wildan, M. Mayasari, Rina Dewi Mohammad Toifur Muhammad Arifin Ngurah Ayu Ketut Umiati Rajabiah, Nurlaila Ratno Nuryadi Sihombing, Yuan Alfinsyah T, Thoyibi Toto Rusianto