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

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Sintesis Nanopartikel Zno/Al2(So4)3 Dengan Metode Mechanical Alloying Sebagai Katalis Limbah Cair Untuk Meningkatkan Ketersediaan Air Vika Sri Anti; Heryanto Heryanto; Dahlang Tahir
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 19, No 1 (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 (1198.02 KB) | DOI: 10.20527/flux.v19i1.11825

Abstract

ZnO/Al2(SO4)3 synthesized by mechanical alloying method (1, 10, and 15 hours) was applied as methylene blue (MB) photodegradation. Fourier transform infrared (FTIR), X-Ray Diffraction (XRD), and Uv-Visible (Uv-Vis) were used to characterize the Physico-chemical properties of the composites. The results of XRD and FTIR characterization showed an average crystal size of 50.02 nm and the lowest transmittance value (%) at 10 hours milling, the degradation efficiency was much influenced by crystallinity speed, functional groups, and milling time. In this study, the optimal degradation based on the results of the Uv-Vis was shown by the sample ZnO/Al2(SO4)3 for 10 hours milling with a degradation percentage of 84.87%. Furthermore, it was found a ZnO/Al2(SO4)3 composite with a very short degradation time of 20 minutes. In order to reduce water pollution in environments, composite based on natural material is a promising solution due to their ability to break up pollutant radical compounds bonding.
PELATIHAN PEMBUATAN PAPAN IKLAN DOT-MATRIKS BERBASIS MIKROKONTROLER DI SMKN 1 WAJO A. Arifin; Ida Laila; Muqoil Darussalam; Nurlindah Hamrun; Dahlang Tahir; Syamsir Dewang
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 5 No. 3 (2021): Jurnal Panrita Abdi - Juli 2021
Publisher : LP2M Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/pa.v5i3.11254

Abstract

Technological development in the manufacture of microcontroller-based dot-matrix billboards carried out in the form of counseling and training for students at Wajo 1 State Vocational High School (SMK). The implementation of this training aims to increase the insight, knowledge, and skills of vocational school students, which are an educational level that must have different knowledge from the level of education in general. The method of implementing this activity includes site observation, preparation, counseling, and provision of materials related to physics and energy, entrepreneurship, optoelectronic technology, as well as the implementation of training on making Arduino microcontroller-based dot-matrix billboards and evaluating the training implementation. The result of this activity is an increase in the knowledge and insight of students in terms of making a series of dot-matrix billboards using electronic components, understanding program code, running the Arduino Integrated Development Environment (IDE) program, conducting simulations on circuits using the Arduino microcontroller and students have successfully demonstrated and run the running text panel that was created using an Android smartphone. --- Pengembangan teknologi dalam pembuatan papan iklan dot-matriks berbasis mikrokontroler yang dilakukan dalam bentuk penyuluhan dan pelatihan kepada siswa-siswi di Sekolah Menengah Kejuruan (SMK) Negeri 1 Wajo . Pelaksanaan pelatihan ini bertujuan untuk meningkatkan wawasan, pengetahuan dan keterampilan siswa-siswi SMK yang merupakan tingkat pendidikan yang harus memiliki pengetahuan yang berbeda dari tingkat pendidikan pada umumnya. Metode pelaksanaan kegiatan ini meliputi peninjauan lokasi, persiapan, penyuluhan dan pemberian materi terkait fisika dan energi, kewirausahaan, teknologi opto-elektronika, serta pelaksanaan pelatihan pembuatan papan iklan dot-matriks berbasis mikrokontroler arduino dan evaluasi pelaksanaan pelatihan. Hasil dari kegiatan ini adalah adanya peningkatkan pengetahuan serta wawasan siswa dalam hal pembuatan rangkaian papan iklan dot-matriks menggunakan komponen elektronika, memahami kode program, menjalankan program arduino Integrated Developement Environment (IDE), melakukan simulasi pada rangkaian menggunakan mikrokontroler arduino serta siswa telah berhasil mendemonstrasikan dan menjalankan panel running text yang telah dibuat dengan menggunakan smartphone android.  
Effect of Geometrical Structure to the Performance of Monolithic Dye–Sensitized Solar Cells Bayu Aditya Nugraha; Shobih Shobih; Jojo Hidayat; Dahlang Tahir
Jurnal Elektronika dan Telekomunikasi Vol 18, No 2 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jet.v18.53-59

Abstract

Since invented for the first time, researchers in the world were focusing on how to increase the efficiency of dye-sensitized solar cells (DSSC) and reduce of the fabrication cost. Monolithic type of DSSC is one of the best solutions to reduce the fabrication cost due to the elimination of one of transparent conductive oxide (TCO) substrate. In this study, DSSC monolithic was fabricated layer by layer by using screen printing method. There are three layers that printed in each cell namely TiO2, ZrO2, and carbon before being injected with electrolytes. The geometrical structure of DSSC was varied to find the highest performance. From the I-V characteristics and incident photon-to-current efficiency (IPCE) characterization shows the highest efficiency is 0.137% and the highest conversion of photons to current occurs at around 510 nm wavelength, for a structure which has ZrO­2 layer not crosses over the no-FTO area, while TiO2 layer half crosses the no-FTO area, this is most likely caused by the imperfection of the ZrO2layer.
Analysis of Thermal Treatment Zirconia as Spacer Layer on Dye-Sensitized Solar Cell (DSSC) Performance with Monolithic Structure Chairil Anwar; Erlyta Septa Rosa; Shobih Shobih; Jojo Hidayat; Dahlang Tahir
Jurnal Elektronika dan Telekomunikasi Vol 18, No 1 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jet.v18.21-26

Abstract

Monolithic dye-sensitized solar cells (DSSC) offer the prospect of lower material cost and require a simpler manufacturing process compared with conventional DSSC. Fabricated on a single fluorine tin oxide (FTO) glass substrate consists of a nanoporous TiO2 photoanode layer, a ZrO2 spacer layer, a carbon counter electrode layer, a dye, and an electrolyte. The spacer layer on the monolithic DSSC serves as electrolyte storage and insulating layer to separate between photoanode and counter electrode. Zirconia is often used as a spacer because it has high temperature resistant properties, high dielectric constant and adhesive as an insulator that has band gap between 5-6 eV. The effects of the thermal treatment of zirconia layer as a spacer electrolyte on the performance of monolithic DSSC have been investigated. The cell’s performance increases with the sintering temperature as well as indicated by the decreased in particle size and increased in quantum efficiency in the absorption region of the titania layer. Co-sintering treatment tends to drastically reduce cell’s performance. The highest performance was obtained at a temperature sintering of 500o C with an PCE of 0.22%, Isc = 0.16 mA and Voc = 0.71 V.
A Comparison of the Utilization of Carbon Nanopowder and Activated Carbon as Counter Electrode for Monolithic Dye-Sensitized Solar Cells (DSSC) Zaky Mubarak; Natalita Maulani Nursam; Shobih Shobih; Jojo Hidayat; Dahlang Tahir
Jurnal Elektronika dan Telekomunikasi Vol 18, No 1 (2018)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jet.v18.15-20

Abstract

Monolithic design is one of the most promising dye-sensitized solar cell (DSSC) architectures to develop, because it allows the elimination of one conductive substrate and offers the possibility for printing layer-by-layer of the materials that made up its structure. In this study, titanium dioxide-based monolithic type DSSCs were fabricated on a single fluorine-doped transparent oxide coated glass with TiO2 as photoanode and porous ZrO2 as spacer. The type of the carbon material used as the composite paste for the counter electrode was varied to see the effect on the solar cell efficiency. Four-point probes measurement revealed that the resistivity of the carbon layer synthesized using activated carbon exhibited slightly higher conductivity with a sheet resistance of 10.70 Ω/sq and 11.09 Ω/sq for activated carbon and carbon nanopowder, respectively. The efficiency of DSSC that uses activated carbon as counter electrode was higher (i.e. 0.221%) than the DSSC with carbon nanopowder (i.e. 0.005%). The better performance of DSSC with activated carbon as a counter electrode was due to its better conductivity and higher surface area compared to those of carbon nanopowder.
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.
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
Co-Authors A'yun, Arini Qurrata A. Arifin Abdullah, Bualkar Arsita sita Bayu Aditya Nugraha Chairil Anwar Chairil Anwar Dani, Ali Umar Erlyta Septa Rosa Erlyta Septa Rosa Eunike Dwioknain Fitriani Fitriani Gareso, Paulus Lobo Hamsi, Taufik Hardianti Hardianti Hee Jae Kang Hee Jae Kang Hendri Hendri Heryanto Heryanto Ida Laila Ilyas, Sri Dewi Astuty Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Jojo Hidayat Jojo Hidayat Jojo Hidayat June Mellawati Muqoil Darussalam Natalita Maulani Nursam Nugraha, Bayu Aditya Nurlaela Rauf Nurlindah Hamrun Nursam, Natalita Maulani Nurul Fajri R Tang Putri, Radha Hartina R Pradana Ramlan, Nurul Mutmainnah Shobih Shobih Shobih Shobih Shobih Shobih Siti Fatimah Siti Fatimah Sri Dewi Astuty Ilyas Syamsir Dewang Syamsul Arifin Vika Sri Anti Zaky Mubarak Zaky Mubarak, Zaky