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All Journal Jurnal Pertahanan : Media Informasi tentang Kajian dan Strategi Pertahanan yang Mengedepankan Identity, Nasionalism dan Integrity Jambura Physics Journal Molekul: Jurnal Ilmiah Kimia
Isnaeni Isnaeni
Research Center for Physics, Indonesian Institute of Sciences
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology Physics Other

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SYNTHESIS OF CARBON DOTS (CDS) AND DETERMINATION OF OPTICAL GAP ENERGY WITH TAUC PLOT METHOD Jumardin Jumardin; Akhiruddin Maddu; Koekoeh Santoso; Isnaeni Isnaeni
Jambura Physics Journal Vol 3, No 2 (2021): October 2021
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jpj.v3i2.11235

Abstract

Carbon Dots (CDs) which have been synthesized using the laser ablation method show the presence of UV-Vis absorption in the wavelength range of 303 nm to 333 nm for absorbance and 495 nm to 503 nm for fluorescence. Changes in the time duration 1, 2, 3 hours of CDs resulted in changes in the optical energy gap. The optical energy gap valuesare distinguished by the type of indirect transition (n=2) is 3.40 eV (1 hour), 3.15 eV (2 hour), 2.85 eV (3 hour) and direct transition (n=1/2) is 2.58 eV (1 hour), 2.31 eV (2 hour), 1.70 eV (1 hour).
Surface-enhanced Raman Scattering (SERS) Substrate of Colloidal Ag Nanoparticles Prepared by Laser Ablation for Ascorbic Acid Detection Teguh Endah Saraswati; Yudha Pratama Putra; Mohammad Rifqi Ihsan; Isnaeni Isnaeni; Yuliati Herbani
Molekul Vol 13, No 1 (2018)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.834 KB) | DOI: 10.20884/1.jm.2018.13.1.409

Abstract

Ag nanoparticles were synthesized by laser ablation using an Ag plate in distilled water. This method was performed using a laser with a wavelength of 532 nm and energy of 30 mJ for 60 min. Ag nanoparticles successfully formed, confirmed by the selected area electron diffraction (SAED) which revealed four principal crystal planes of (111), (200), (220) and (311). The size distribution of Ag nanoparticles ranged from 5 to 40 nm, as estimated from electron imaging observed by transmission electron microscope (TEM). Ascorbic acid was used as the analyte to test the characteristics of surface-enhanced Raman scattering (SERS) of colloidal Ag nanoparticles. The concentration of ascorbic acid (1.0, 0.5 and 0.25 wt%) and incubation time (0 and 6 h) were varied to determine the limit of detection and the effect of incubation time. The Raman scattering spectroscopy results showed that the colloidal Ag nanoparticle substrate improved the signals for detection of ascorbic acid.
SN-CUO-ARABIC GUM COMPOSITION FOR RED TRACER PROJECTILE AMMUNITION POTENTIAL Abdul Basyir; Nining Sumawati Asri; Didik Aryanto; Isnaeni Isnaeni; Cherly Firdharini; Wahyu Bambang Widayatno; Agus Sukarto Wismogroho; Diang Sagita; Denny Lesmana
Jurnal Pertahanan: Media Informasi ttg Kajian & Strategi Pertahanan yang Mengedepankan Identity, Nasionalism & Integrity Vol 7, No 1 (2021)
Publisher : The Republic of Indonesia Defense University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33172/jp.v7i1.938

Abstract

Fundamentally, tracer projectile material based on pyrotechnic composition, and where the pyrotechnic was generally composed of fuel, oxidizer, and binder. The tin (Sn) material is one of the candidates for fuel material because tin has a low melting point, so this composition can ignite at low temperature, while the copper oxide (CuO) can emit the orange-red spectrum. This study aims to evaluate the thermal and spectrum character of Sn-CuO-AG-based composition. The characterization data of these samples was evaluated by tests of morphology and phase, enthalpy change, calorie energy, and spectrum emission. Based on this data, the 17Sn-68CuO-15AG sample was emitted a strong red color too, but this sample has a high or the longest exothermic process. Furthermore, the 27Sn-58CuO-15AG sample has emitted a weak red color with medium exothermic energy. Generally, the 22Sn-63CuO-15AG is more suitable than the two other compositions for the tracer projectile composition of ammunition, this material emits a strong red spectrum and low-calorie energy.
Co-Authors Abdul Basyir Agus Sukarto Wismogroho Akhiruddin Maddu Cherly Firdharini Denny Lesmana Diang Sagita Didik Aryanto jumardin jumardin koekoeh santoso Mohammad Rifqi Ihsan Nining Sumawati Asri Teguh Endah Saraswati Wahyu Bambang Widayatno Yudha Pratama Putra Yuliati Herbani