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All Journal POSITRON Jurnal Ilmiah Aplikasi Isotop Radiasi Journal of Mathematical and Fundamental Sciences Gravitasi Omega: Jurnal Fisika dan Pendidikan Fisika Jurnal Fisika FLUX Panrita Abdi - Jurnal Pengabdian pada Masyarakat Journal of Dentomaxillofacial Science Indonesian Journal of Chemistry Jurnal Elektronika dan Telekomunikasi Indonesian Physical Review Makara Journal of Science
Dahlang Tahir
Department Of Physics, Hasanuddin University, Makassar 90245
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics Other

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Assisted Surface-state Recombination of Orange-peel Carbon Nanodots in Various Matrices Fatimah, Siti; Isnaeni, Isnaeni; Tahir, Dahlang
Makara Journal of Science Vol. 22, No. 1
Publisher : UI Scholars Hub

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Abstract

The contentious origin of the luminescence of carbon nanodots (CDs) has attracted considerable attention. In this work, we synthesized CDs from orange peel by using a microwave-assisted technique. We investigated the optical properties of the synthesized CDs. Moreover, we studied the effect of matrix addition on the optical properties of CDs. We found that matrix addition significantly influences the absorbance and photoluminescence of CDs. Shifts in absorbance peak intensity and emission peak wavelength indicated that the bonding of matrix molecules on the surfaces of the CDs has changed the structures of CDs. This finding is supported by the extended half-life of CDs after matrix addition. Our results will expand researchon the use of CDs as phosphorescent materials.
Studi Quality Control (QC) Pesawat Fluoroscopy (Angiografi) di PT. Siloam Internasional Hospital Makassar menggunakan Multimeter RaySafe (X2) dan Black Piranha RTI Aswad Aswad; Bualkar Abdullah; Dahlang Tahir
POSITRON Vol 8, No 2 (2018): November Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (927.751 KB) | DOI: 10.26418/positron.v8i2.24752

Abstract

Tujuan dari penelitian ini adalah melakukan uji quality control (QC) pada pesawat fluoroscopy (angiografi) di PT. Siloam Internasional Hospital Makassar, pengukuran didasarkan pada protokol QC yang dikembangkan oleh Radiological Council Western Australia. Pengukuran yang dilakukan meliputi akurasi tegangan tabung (kVp), waktu fluoroskopik maksimum, dan uji kualitas berkas/half value layer (HVL), linearitas keluaran (mGy/mAs), laju dosis permukaan II, dan kualitas citra. Hasil penelitian menunjukkan bahwa pengujian generator dan tabung pesawat sinar-x masih dalam batas toleransi yaitu 1,4%. Nilai maksimum laju dosis pasien tipikal 14,3 mGy/min, dan laju dosis serap reseptor citra sebesar 67,8 mGy/min untuk pengukuran menggunakan 20 cm phantom polymethyl methacrylate (PMMA) yang dioperasikan pada mode dosis normal dan dosis tinggi.
Sintesis dan Karakterisasi Fotoluminisens Carbon Dots Berbahan Dasar Organik dan Limbah Organik Siti Fatimah; Isnaeni Isnaeni; Dahlang Tahir
POSITRON Vol 7, No 2 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.218 KB) | DOI: 10.26418/positron.v7i2.22660

Abstract

Bahan dan limbah organik dapat disintesis menjadi CDs dengan metode green synthesis berbasis microwave assisted. Bahan organik yang digunakan adalah sawi, kentang, biji jagung dan limbah jagung (kulit dan tongkol jagung). Karakterisasi fotoluminisens (PL) digunakan untuk menunjukkan sifat optik CDs. Hasil karakterisasi PL dari CDs berbahan dasar bahan dan limbah organik menunjukkan panjang gelombang yang relatif sama yaitu 500 nm. Perbedaan CDs bahan dan limbah organik yaitu pada intensitas pendaran CDs. CDs biji jagung memiliki intensitas pendaran yang tinggi dibandingkan CDs yang berasal dari bahan organik lainya yaitu 42 a.u.. Sedangkan untuk limbah jagung memiliki panjang gelombang dan intensitas yang relatif sama. Besarnya energi gap yang dihasilkan dari CDs dari bahan organik berada disekitaran 2,46 eV, dimana berada pada rentang energi gap CDs. Hal ini menunjukkan bahwa bahan dan limbah organik dapat disintesis menjadi CDs dengan efektif, efisien, ekonomis dan ramah lingkungan.
Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template Suriati Eka Putri; Diana Eka Pratiwi; Rachmat Triandi Tjahjanto; Nita Magfirah Ilyas; Dahlang Tahir; Abd Rahman; Heryanto Heryanto
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.78875

Abstract

The gelcasting technique was employed to fabricate porous ceramics utilizing kaolinite clay as the base material with a combination of 20 wt.% cassava starch. The utilization of cassava starch as a pore-template material is a sustainable and eco-friendly approach. The dry mixture compacted pellets underwent calcination for 2 h at three distinct sintering temperatures, namely 900, 1000, and 1100 °C. The present study investigated the impact of sintering temperatures on various ceramic properties, including but not limited to porosity, hardness, crystallinity, lattice strain, and morphology. Furthermore, an increase in sintering temperature led to a reduction in crystallinity of the ceramic material from 81.71 to 78.06%, while the lattice strain increased, as determined by the full width at half maximum peak diffraction calculation. The study determined that the pore size remained microporous (21 Å) across all temperature treatments. Ultimately, a porous ceramic material was fabricated, exhibiting a porosity of 39.44% by volume and a desirable hardness of 94 HB. The optimal sintering temperature for this material was found to be 900 °C. The anticipated application of the porous ceramic, which has taken on a pellet shape, is as a catalyst support for wastewater filtration in the future.
BAND ALIGNMENT OF ULTRATHIN GIZO/SiO2/Si HETEROSTRUCTURE DETERMINED BY ELECTRON SPECTROSCOPY Tahir, Dahlang; Ilyas, Sri Dewi Astuty; Kang, Hee Jae
Makara Journal of Science Vol. 15, No. 2
Publisher : UI Scholars Hub

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Abstract

Amorphous GaInZnO (GIZO) thin films are grown on SiO2/Si substrate by the RF magnetron sputtering method. By the combination of measured band gaps from reflection energy loss spectroscopy (REELS) spectra and valence band from X-ray photo-electron spectroscopy (XPS) spectra, we have demonstrated the energy band alignment of GIZO thin films. The band gap values are 3.2 eV, 3.2 eV, 3.4eV and 3.6eV for the concentration ratios of Ga: In: Zn in GIZO thin films are 1:1:1, 2:2:1, 3:2:1 and 4:2:1, respectively. These are attributed to the larger band gap energy of Ga2O3 compared with In2O3 and ZnO. The valence band offsets (ΔEv) decrease from 2.18 to 1.68 eV with increasing amount of Ga in GIZO thin films for GIZO1 to GIZO4, respectively. These experimental values of band gap and valence band offset will provide the further understanding in the fundamental properties of GIZO/SiO2/Si heterostructure, which will be useful in the design, modeling and analysis of the performance devices applications
THE EFFECT OF ADDITIONAL IRON SAND ON THE CRYSTAL SIZE AND STRAIN OF ZnO Lorna, Lorna; Mutmainna, Inayatul; Tahir, Dahlang; Gareso, Paulus L
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.178

Abstract

This study observed the effect of the addition of iron (Fe) doping on the characteristics of Zinc Oxide (ZnO) nanoparticles.Zn(1-x)Fe(x) with various concentration of x = 0, 2, 4, 6, 8, and 10% was prepared by coprecipitation method using Sodium Hydroxide and Hydrogen Chloride. The effect of adding Fe doping on ZnO was characterized using X-ray Diffraction (XRD) to determine the crystal structure, size, and strain. The analysis result confirmed the absence of additional impurity peaks in the ZnO nanoparticles. Fe doping affects the Zn lattice structure. X-ray diffraction (XRD) study confirms the crystalline Hexagonal structure. Crystal size analysis using Debye Scherrer, UDM, and Halder-Wagner method obtained varying crystal sizes with variations in the concentration of Fe ranging from 19.89-44.72 nm. The crystal size and strain obtained from the Debye Scherrer method are smaller
XRD STRUCTURE STUDY ON NICKEL DOPED ZINC OXIDE NANOPARTICLES SYNTHESIZED BY COPRECIPITATION METHOD Destalina, Destalina; Mujtahid, Fitriah; Mutmainna, Inayatul; Tahir, Dahlang; Gareso, Paulus L
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.179

Abstract

Nickel-doped Zinc Oxide (Zn(1-x)Ni(x)O) nanoparticles have been synthesized by the chemical coprecipitation method. The structure and characteristic of synthesized Ni doped ZnO nanoparticles ware analyzed by X-ray diffraction (XRD) patterns. Crystallite sizes and lattice strain of all samples were calculated using the Scherrer’s formula, Uniform Deformation Model (UDM) and Halder-Wagner (H-W) method. X-ray diffraction analysis confirmed hexagonal cubic structure of Ni-doped ZnO nanoparticles. Also, the crystallite size of the nanoparticles reduces as the nickel concentration increase. The result showed the average crystallite size calculated by Scherrer’s formula (25-29 nm) was smaller than crystallite size using UDM method (51-63) the largest average crystallite size and H-W method (42-47 nm). The lattice strain increases with decreasing crystallite sizes value. The crystal size Ni- doped ZnO nanoparticles decreased with increasing dopant concentration.
Co-Authors A'yun, Arini Qurrata A. Arifin Abd Rahman Abdullah, Bualkar Ahmad F. Nugraha Arsita sita Aswad Aswad Bahruddin Thalib Bayu Aditya Nugraha Chairil Anwar Chairil Anwar Dani, Ali Umar Destalina, Destalina Diana Eka Pratiwi Erlyta Septa Rosa Erlyta Septa Rosa Eunike Dwioknain Eunike Dwioknain Fitriani Fitriani Gareso, Paulus L Gareso, Paulus Lobo Hamsi, Taufik Hardianti Adam Hardianti Hardianti Hee Jae Kang Hee Jae Kang Hee Jae Kang Hee Jae Kang Hendri Hendri Heryanto Haeruddin Heryanto Heryanto Heryanto Heryanto Ida Laila Ilyas, Sri Dewi Astuty Inayatul Mutmainna, Inayatul Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Jae Cheol Lee Jae Gwan Chung Jojo Hidayat Jojo Hidayat Jojo Hidayat June Mellawati Lorna, Lorna Mujtahid, Fitriah Muqoil Darussalam Natalita Maulani Nursam Nita Magfirah Ilyas Nugraha, Bayu Aditya Nurlaela Rauf Nurlindah Hamrun Nursam, Natalita Maulani Nurul Fajri R Tang Putri, Radha Hartina R Pradana Rachmat Triandi Tjahjanto Ramlan, Nurul Mutmainnah Roni Rahmat Shobih Shobih Shobih Shobih Shobih Shobih Siti Fatimah Siti Fatimah Siti Fatimah Sri Dewi Astuty Ilyas Suhk Kun Oh Sung Heo Suriati Eka Putri Sven Tougaard Syaharuddin Kasim Syamsir Dewang Syamsul Arifin Vika Sri Anti Zaky Mubarak Zaky Mubarak, Zaky