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All Journal Jurnal Fisika Unand Communications in Science and Technology Jurnal Ilmu Fisika Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Lensa : Jurnal Kependidikan Fisika Sainstek : Jurnal Sains dan Teknologi Science, Technology, and Communication Journal al Kimiya : Jurnal Ilmu Kimia dan Terapan
Akrajas Ali Umar
University Kebangsaan Malaysia
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics Other

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Sintesis Nanopartikel Titanium Dioksida Didoping Rhutenium Bajili, Abdil; Dahlan, Dahyunir; Umar, Akrajas Ali
Jurnal Ilmu Fisika Vol 8, No 2 (2016): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (382.911 KB) | DOI: 10.25077/jif.8.2.54-59.2016

Abstract

Nanopartikel titanium dioksoda (TiO2) yang didoping ruthenium (Ru/TiO2) ditumbuhi dengan menggunakan metode penumbuhan Liquid Phase Deposition (LPD) telah berhasil dilakukan. Konsentrasi doping ruthenium yang digunakan adalah 2,5 mM. Variasi lama waktu penumbuhan dilakukan selama 3 jam, 5 jam, 7 jam dan 10 jam. Kemudian dilakukan karakterisasi Ultraviolet-visible, fotoelektron sinar-x dan teknik difraksi sinar-x. Energi gap yang didapatkan dengan waktu penumbuhan 3 jam dan 5 jam adalah 3,22 eV dan 3,28 eV. Sedangkan waktu penumbuhan 7 jam dan 10 jam adalah 3,16 eV dan 3,29 eV. Morfologi dari Ru/TiO2 bersifat nanopori dengan fasa adalah anatase. Kata kunci: Liquid Phase Deposition (LPD), nanopartikel Ru/TiO2, doping ruthenium, fase anatase. 
Pengaruh Lama Penumbuhan Titanium Dioksida Didoping Copper Terhadap Energi Gap Berli, Ade Usra; Dahlan, Dahyunir; Umar, Akrajas Ali
Jurnal Ilmu Fisika Vol 8, No 2 (2016): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (187.812 KB) | DOI: 10.25077/jif.8.2.60-63.2016

Abstract

Deposisi lapisan TiO2 didoping Cu telah berhasil ditumbuhkan dengan menggunakan metoda Liquid Phase Deposition (LPD). Lapisan TiO2-Cu dibuat dengan menggunakan material Ammonium hexafluorotitanate ((NH4)2TiF6), Copper (II) Nitrate hydrate (Cu(NO3)2·xH2O), dan Hexamethylen tetramine (C6H12N4). Dalam penelitian ini dilakukan variasi lama penumbuhan lapisan yaitu 3 jam, 5 jam, 7 jam dan 10 jam. Lapisan TiO2-Cu dikarakterisasi menggunakan Spektrometri Ultraviolet-Visible (UV-Vis) untuk menentukan energi gap melalui spektra difusi reflektansi. Hasil energi gap yang diperoleh pada lapisan TiO2-Cu dengan variasi lama penumbuhan yaitu antara 3,26-3,30 eV.Kata kunci: Titanium dioksida (TiO2), Liquid Phase Deposition (LPD) dan doping 
EFEK KONSENTRASI Cu PADA STRUKTUR DAN SIFAT HANTARAN LISTRIK NANOPARTIKEL CuPt Imamora, Marjoni; R, Setia Erlila; Rahmi, Elvy; Maiyena, Sri; Umar, Akrajas Ali
Sainstek : Jurnal Sains dan Teknologi Vol 7, No 1 (2015)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (492.139 KB) | DOI: 10.31958/js.v7i1.128

Abstract

The investigation of bimetallic CuPt Nanoparticles (CuPt NPs) with average diameters in the 196.7±98 nm range have been prepared by the Liquid phase deposition methods and synthesized directly on an indium tin oxide (ITO) substrate. CuPt NPs with  high surface defect grown on (ITO) surface were prepared via a simple immersion of the substrate into a solution contains 1 mM Potassium Hexachloro Platinate (K2PtCl6), 0.2 mM Anhydrous Copper (II) Sulfate (CuSO4) anhydrous, 0.01 M Sodium dodecyl sulfate (SDS) and 10 mM Formic acid for 4 h at room temperature. The modification of Cu2+ ion precursor play a role to determine the nanoparticles geometry obtained. The simultaneous reduction of metal ions leads to either a surface enriched with one component or an alloy type of structure depending on the bimetal composition. The bimetallic CuPt NPs dispersions are characterized by FESEM, EDX Mapping, XRD, HRTEM and XPS analysis.Key words: CuPt, Liquid phase deposition, Bimetallic CuPt NPs
APLIKASI SINTESIS TiO2 NANOPARTIKEL DALAM DEGRADASI FOTOKATALITIK METIL JINGGA Husna, Isramil; Umar, Akrajas Ali; Ramli, Muhammad Adam
Sainstek : Jurnal Sains dan Teknologi Vol 10, No 1 (2018)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.546 KB) | DOI: 10.31958/js.v10i1.1203

Abstract

The development in textile industry results in the increase of the use of non-organic materials in human life, such as the use of dyes that cannot be decomposed naturally, such as the use of artificial dyes in textile industry and other similar fields. This implies that if those artificial dye are not carefully managed, they will have a definite impact on the environment, such as water pollution where those substances contaminate clean water and therefore will be very dangerous for human daily needs of water for drinking, bathing and other needs. This in turn will cause various diseases in living things and pollute nature as well. The purpose of this study is to figure out the effect of methyl orange degradation by the addition of TiO2 photocatalyst. In this study, 10 ppm orange methyl solution were used, where 5 ml of orange methyl were dissolved in 5 ml of water then added with TiO2 and then irradiated with UV for 180 minutes. By calculating the degradation of methyl orange every 10 minutes, which was measured using a UV-Vis spectrophotometer. The finding shows that the longer the irradiation takes place, the more desirable degradation of methyl orange is desired. The results obtained from 180 minutes are absorbance values that are worth 0.8 down to 0.3.
Pengaruh Doping Palladium (Pd) Terhadap Lapisan TiO2 dengan Metode LPD untuk Applikasi Fotoanoda Sel Surya DSSC Dwipanur, Andhika; Dahlan, Dahyunir; Firmawati, Nini; Umar, Akrajas Ali
Jurnal Ilmu Fisika Vol 12, No 1 (2020): Published in March 2020
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (794.519 KB) | DOI: 10.25077/jif.12.1.6-10.2020

Abstract

Lapisan TiO2 yang didoping Pd dengan metode deposisi fase cair (Liquid Phase Deposition, LPD) telah dilakukan. Adapun tujuan sintesis lapisan tersebut adalah untuk mendapatkan lapisan yang terdiri dari nanoplate yang akan diaplikasikan untuk fotoanoda sel surya. Sebagai larutan prekursor digunakan 0,5 M (NH4)2TiF6 dengan variasi doping Pd adalah 0; 6.25; 12.50; 25,00 dan 50,00 mM. Penumbuhan lapisan dilakukan pada suhu 900°C selama 9 jam.Didapatkan berturut-turut energi gap adalah 3,20; 3,25; 3,18; 3,16; dan 3,10 eV. Karakterisasi FESEM menunjukkan bahwa lapisan yang dihasilkan terdiri dari partikel berbentuk nanoplate yang tersebar merata di permukaan substrat ITO. Luas nanoplate yang dihasilkan di bawah 100 μm2 dengan ketebalan beberapa nanometer. Karakterisasi-karakterisasi ini menunjukkan bahwa lapisan TiO2 yang didoping oleh Pd sangat berpotensi sebagai photoanode untuk elektroda sel surya DSSC (Dye Sensitized Solar Cell).
SYNTHESIS AND CHARACTERIZATION OF TIO2 SEMICONDUCTOR DOPED BY AGNO3 AND THEIR APPLICATION AS PHOTOANODE IN DYE-SENSITIZED SOLAR CELLS Ali Umar, Marjoni Imamora; Faizil, Nanda; Umar, Akrajas Ali; Saad, Siti Khatijah Md
Lensa: Jurnal Kependidikan Fisika Vol 8, No 1: June 2020 (in Press)
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-lkf.v8i1.2728

Abstract

The use of Titanium dioxide (TiO2) semiconductors in Dye-Sensitized Solar Cells (DSSC) devices have been extensively studied and synthesized with various techniques to obtain optimal performance. The TiO2 semiconductors with optimal performance are influenced by the growth method, the time of growth, the shape of the microstructure, and the optical properties. In this study, it was reported about the effect of silver nanoparticles (AgNO3) doping onto TiO2 semiconductors on their microstructure, reflectance, and efficiency of the DSSC device. The synthesis of TiO2 was carried out using liquid phase deposition (LPD) and immersed into an AgNO3 solution with a variation of time namely 0.5 h, 1 h, 2 h, 4 h, and 6 h. The entire TiO2 + AgNO3 sample, then used as a photoanode on DSSC with plastisol as a counter electrode. Characterization of microstructure, reflectance, and DSSC performance was carried out by using field emission scanning electron microscopy (FESEM), Uv-Vis Spectrophotometer, and Gamry Instrument, respectively. The FESEM results show that AgNO3 has successfully grown on the ITO substrate in a spherical shape with an average particle diameter ranging from 1.52-2.29 ?m. From observations using the Uv-Vis Spectrophotometer, obtained the energy band gap values ranged from 0.22 to 2.27 eV. The best results of DSSC device efficiency, with TiO2+AgNO3/Dye/Plastisol structure, have resulted in the Voc of 0.694 V, current density (Jsc) of 0,943 mA/cm2and fill factor (FF) of 43,50% which is obtained at sample 1.
The Liquid Phase Deposition of ZnPtBNs: Study on Structural, Morphology, and Their Sheet-Resistant Umar, Marjoni Imamora Ali; Mardiani, Mardiani; Mawarnis, Elvy Rahmi; Umar, Akrajas Ali
Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Vol. 5 No. 2: July 2021
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/esaintika.v5i2.497

Abstract

This paper reports ZnPt bimetallic nanoparticles (ZnPtBNs) synthesis through the liquid phase deposition (LPD) of of Zn(NO3)2.6H2O onto the indium-titanium oxide (ITO) substrates at various concentrations. The Effects of growth solution, the morphology, structural, and sheet resistance were studied. After preparation, the materials were characterized by using field emission electron microscopy (FESEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and Four Point Probe (FPP) measurement by using Keithley 2401 source-meter. By inserting a growth solution into the ITO substrate the ZnPtBNs was successfully in-situ prepared. The synthesized ZnPtBNs exhibited homogeneous, fibrous at the (111) orientation with an average diameter of 100-700 nm. The atomic ratio of Zn:Pt and sheet resistance of ZnPtBNs decreased with the increase of Zn(NO3)2.6H2O concentration. The optimal elemental composition of the sample was at a ratio of Zn:Pt (1:25) obtained at 0.467 mM of Zn(NO3)2.6H2O. It showed the smallest sheet resistance (13.41 ?) which was 38% lower than the ITO sheet resistance (18.44 ?).
Particle Size Improvement and Layer Absorption of Metil Halida MAPbI3 Perovskite Doping Phenethylammonium Iodide (PEAI) Anla, Anla Fet Hardi; Dahyunir, Dahyunir; muldarisnur, muldarisnur; Amrullah, Yasir; Sadikin, Siti Naqiyah; Ridwan, Jaenudin; Umar, Akrajas Ali
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.13-21.2024

Abstract

This study aims to determine the effect of phenethylammonium iodide (PEAI) doping on grain size and absorption of the methylammonium lead iodide (MAPbI3) perovskite layer. The MAPbI3 perovskite layer is interesting to study because of its potential application in perovskite solar cells. In this study, the preparation of MAPbI3 perovskite layer with PEAI doping variation using a 2-step spin-coating method. The surface morphology of MAPbI3 shows an increase in grain size with the addition of PEAI doping variation. The optimum grain size is shown by adding 1.0 mg/ml PEAI doping variation, which is 117 ± 1.19 nm with a smooth surface morphology and tends to be homogeneous. X-ray diffraction (XRD) results on Perovskite MAPbI3 showed no difference in peaks with the addition of PEAI doping. However, there is only a slight angle shift of 2 theta, 0.05° at the main peak (110) and (220), so it will not change the cubic structure of MAPbI3 crystal. The ultra violet visible (UV-Vis) graph shows an increase in absorbance of Perovskite MAPbI3 with the addition of PEAI doping in the wavelength range of 400-550 nm. This research is expected to be a foundation for developing more efficient and stable solar cells.
Performances of dye-sensitized solar cell (DSSC) with working electrode of aluminum-doped ZnO nanorods Saputrina, Truly Theresia; Iwantono, Iwantono; Awitdrus, Awitdrus; Umar, Akrajas Ali
Science, Technology and Communication Journal Vol. 1 No. 1 (2020): SINTECHCOM Journal (October 2020)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v1i1.22

Abstract

Renewable energy sources are intensively developed for substituting fossil energy by several routes, such as solar cells and wind power. As a kind of solar cell, dye-sensitized solar cell (DSSC) was studied for low cost and environmentally friendly cell in competing with a silicon-based cell which dominated in the market. But, main problem in DSSC is low current density and power conversion efficiency, especially zinc oxide (ZnO)-based DSSC. In this paper, we enhance the ZnO nanorod properties through the doping of aluminum (Al). For obtaining optimum results, we varied the dopant concentration of 1%, 1.5%, 1%, and 3%. The Al-doped ZnO nanorod was grown by a seed-mediated hydrothermal method at 90oC for 8 hours. The physical properties were analyzed by field emission scanning electron microscopy and EDX, while the photovoltaic properties were analyzed by J-V curve analysis. An improvement of photovoltaic performance up to 200% is obtained by the ZnO nanorod with 1% Al-doped concentration.
Pengaruh Penambahan Phenethylammonium Iodida (PEAI) terhadap Struktur dan Sifat Optik Lapisan Perovskite Solar Cell FAPbI3 Manda, Poni Dwi; Dahlan, Dahyunir; Harmadi, Harmadi; Umar, Akrajas Ali
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.298-304.2025

Abstract

This study explores the effect of doping phenethylanimum iodide (PEAI) on grain size and absorption ability in the perovskite formanidinium lead iodide (FAPbI3) layer. FAPbI3 was chosen as the object of study because of its potential application in perovskite-based solar cell technology. In this experiment, the FAPbI3 perovskite layer was prepared with a PEAI doping variation using a two-stage spin-coating method. Ultraviolet-visible (UV-Vis) spectrum analysis showed that the perovskite layer has typical optical absorption characteristics at a wavelength of 780 nm, with a measured energy gap value of 1.48 eV at a PEAI concentration of 2 mg/ml. In addition, the surface morphology of FAPbI3 showed an increase in grain size along with the addition of PEAI doping, where the optimal grain size was recorded at a doping of 2 mg/ml with a size of 0.54 ± 0.03 μm and a smooth and homogeneous morphology. These findings are expected to make a significant contribution to the development of more efficient and stable solar cells
Co-Authors Ade Usra Berli Amrullah, Yasir Anla, Anla Fet Hardi Atiek Rostika Noviyanti Awitdrus Awitdrus, Awitdrus Bajili, Abdil Dahyunir Dahlan Dahyunir, Dahyunir Dwipanur P.U, Andhika Dwipanur, Andhika Elvy Rahmi Erman Taer Faizil, Nanda Harmadi Harmadi Husna, Isramil Iwantono Iwan Barnawi Jasril Jasril Manda, Poni Dwi Mardiani Mardiani Marjoni Imamora Ali Umar Mawarnis, Elvy Rahmi Mukhamad Nurhadi, Mukhamad Muldarisnur, Mulda Nini Firmawati R, Setia Erlila Ramli, Muhammad Adam Rati, Yolanda Ratna Kusumawardani, Ratna Ridwan, Jaenudin Saad, Siti Khatijah Md Sadikin, Siti Naqiyah Sadiqin, Siti Naqiyah Saputrina, Truly Theresia Sitorus, Afrida Helena Sri Maiyena Sulistyo Rini, Ari Zaki, Shakahuddin Zulkarnain Usman