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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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Journal : Makara Journal of Science

 1 
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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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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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