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All Journal Jurnal Pembelajaran MIPA Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) JURNAL EDUCATION AND DEVELOPMENT Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Sainstek : Jurnal Sains dan Teknologi Journal of Chemistry Education and Integration

Elvy Rahmi

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Author-ID : 356439

Agriculture, Biological Sciences & Forestry Arts Humanities Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Languange, Linguistic, Communication & Media Social Sciences Other

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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

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

STUDI CELAH ENERGY 1,3,4 MONOMER DAN DIMER TIADIAZOL TERSUBSTITUSI-BH2 Rahmi, Elvy
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 1 (2012)
Publisher : IAIN Batusangkar

The band gap of a 1,3,4 thiadiazole of monomer and dimmer in anti position, monomer and dimer of its ? BH2 substituted of those compounds had been studied by Calzaferri method. The optimized geometry had been obtained by optimizing the bond length (l) arA bond angel (?). The bond surface (?) was not been optimized since those molecules were assumed to be planar. The band gap was determined by measuring the different of HOMO and LUMO of the optimal condition. From there studies it were obtained that the Eg 1,3,4 thiadiazole monomer ard dimer in anti position, monomer and dimer of its substiruted - BH2 were 4,35793 eV; 3.31008eV ; 4.8900eV ;3,09322 eV; 3.11124 eV, respectively. Based on Eg. valued it was concluded that monomer substituted by -BH2, 1,3,4 thidiazole diamer in anti position and dimmer of its substituted - BH2 have Eg in semiconductor range (1,0-3,5 eV). The 1,3,4 thiadiazole monomer had Eg in the isolator range.Key words: Monomer, Dimer, Tiadiazol Tersubstitusi-BH2

STUDI MOLEKUL m2N2 DENGAN GRUP SIMETRI D~h DAN D2h MENGGUNAKAN METODE AB INITIO Rahmi, Elvy
Sainstek : Jurnal Sains dan Teknologi Vol 2, No 1 (2010)
Publisher : IAIN Batusangkar

The study on molecule m2N2 (m=H, Li, Na, Be, Mg, B, Al, C, Si, N, P, O, S, F, Cl) with symmetrical groups D~h and D2h had been conducted by using Ab Initio method. As a part of HyperChem pro 6.0, this program was operated with Pentium 4. The research involved a number of linear cyclic molecules m-N-N-m as well as m-N-m-N. As the result of the computation process, it was found that generally the cyclic molecules m2N2 were more stable than those of the other linear molecules signed with the smaller total energy. It was also found that the most stable linear molecules were NºN resulted from the optimalization of Cl-N-N-Cl with the total molecule energy: -637778.1251 kcal/mol. Meanwhile, the most stable cyclic molecules were S-N-S-N with the total molecule energy: -560789.9726 kcal/mol. Key words: cyclic molecule, ab initio

Co-Authors Akrajas Ali Umar Asmendri Asmendri Ayu Stephani Fathia, Wilda Heppy Yerita Herman Hidayat, Herman Herman, Hidayat Herman, Mimi Hulandari, Febri M. Haviz Marjoni Imamora Ali Umar Mimi Herman R, Setia Erlila Regita Rahmi Nur Azizah REZKI, REZKI Rini Afsa Sri Maiyena Titik Kurningsih

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