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Sintesis dan Karakterisasi Fotoluminisens Carbon Dots Berbahan Dasar Organik dan Limbah Organik Fatimah, Siti; Isnaeni, Isnaeni; Tahir, Dahlang
POSITRON: Berkala Ilmiah Fisika Vol 7, No 2 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

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Abstract

Bahan dan limbah organik dapat disintesis menjadi CDs dengan metode green synthesis berbasis microwave assisted. Bahan organik yang digunakan adalah sawi, kentang, biji jagung dan limbah jagung (kulit dan tongkol jagung). Karakterisasi fotoluminisens (PL) digunakan untuk menunjukkan sifat optik CDs. Hasil karakterisasi PL dari CDs berbahan dasar bahan dan limbah organik menunjukkan panjang gelombang yang relatif sama yaitu 500 nm. Perbedaan CDs bahan dan limbah organik yaitu pada intensitas pendaran CDs. CDs biji jagung memiliki intensitas pendaran yang tinggi dibandingkan CDs yang berasal dari bahan organik lainya yaitu 42 a.u.. Sedangkan untuk limbah jagung memiliki panjang gelombang dan intensitas yang relatif sama. Besarnya energi gap yang dihasilkan dari CDs dari bahan organik berada disekitaran 2,46 eV, dimana berada pada rentang energi gap CDs. Hal ini menunjukkan bahwa bahan dan limbah organik dapat disintesis menjadi CDs dengan efektif, efisien, ekonomis dan ramah lingkungan.
Effect of Chlorine Plasma Treatment on Electronic Properties of GIZO Thin Film Grown on SiO2/Si Substrate Tahir, Dahlang; Oh, Suhk Kun; Kang, Hee Jae; Heo, Sung; Chung, Jae Gwan; Lee, Jae Cheol
Journal of Mathematical and Fundamental Sciences Vol 45, No 3 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

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Abstract

The effect of chlorine plasma treatment on electronic properties of GIZO grown on SiO2/Si by RF magnetron sputtering was investigated using X-ray photoelectron spectroscopy (XPS), reflection electron energy loss spectroscopy (REELS), and secondary ion mass spectroscopy (SIMS). SIMS depth profiles indicated that the concentration of InO and ZnO on the surface was decreased after Cl2 plasma treatment. REELS data showed that the band gap increased from 3.4 to 3.7 eV. XPS showed that Ind5/2 and Zn2p3/2 shifted to the higher binding energies by 0.5 eV and 0.3 eV, respectively. These phenomena were caused by oxygen deficiency and hydrocarbon contamination reduction as indicated by Cl atom bonding with In and Zn cations that are present on the surface after Cl2 plasma treatment.
A Comparison of the Utilization of Carbon Nanopowder and Activated Carbon as Counter Electrode for Monolithic Dye-Sensitized Solar Cells (DSSC) Mubarak, Zaky; Nursam, Natalita Maulani; Shobih, Shobih; Hidayat, Jojo; Tahir, Dahlang
Jurnal Elektronika dan Telekomunikasi Vol 18, No 1 (2018)
Publisher : Indonesian Institute of Sciences

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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.
Physical characteristics test (water content and viscosity) of extraction sodium alginate brown algae (phaeophyta) species padina sp. as basic material for production dental impression material Hamrun, Nurlindah; Thalib, Bahruddin; Tahir, Dahlang; Kasim, Syaharuddin; Nugraha, Ahmad F.
Journal of Dentomaxillofacial Science Vol 3, No 2 (2018)
Publisher : DiscoverSys Inc

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Abstract

Objective: This research aims to explore the potential of brown algae species padina sp. as a dental impression material by examining the physical characteristics of the sodium alginate extraction of brown algae species padina sp.Material and Methods: This research is a quasi-experimental with one-shot case study design. Samples are brown algae species padina sp. from Punaga and Puntondo beach in South Sulawesi. Brown algae species padina sp. is extracted to obtain sodium alginate and further tested for physical characteristics including viscosity test and water content.Results: The extraction of brown algae species padina sp. resulted in 250 grams (25%) of brown powdered sodium alginate that smelled fishy. Physical characteristic tests revealed the water content of sodium alginate species from brown algae padina sp. was 8%. This result is acceptable for sodium alginate water content as set by the Food Chemical Codex that requires less than 15% water content. The measurement of the viscosity obtained is 13.33 cps.Conclusion: These results indicate that the species of brown algae padina sp. has the potential to be one of the basic materials of dental impression material.
Analysis of Thermal Treatment Zirconia as Spacer Layer on Dye-Sensitized Solar Cell (DSSC) Performance with Monolithic Structure Anwar, Chairil; Rosa, Erlyta Septa; Shobih, Shobih; Hidayat, Jojo; Tahir, Dahlang
Jurnal Elektronika dan Telekomunikasi Vol 18, No 1 (2018)
Publisher : Indonesian Institute of Sciences

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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.
Effect of Geometrical Structure to the Performance of Monolithic Dye–Sensitized Solar Cells Nugraha, Bayu Aditya; Shobih, Shobih; Hidayat, Jojo; Tahir, Dahlang
Jurnal Elektronika dan Telekomunikasi Vol 18, No 2 (2018)
Publisher : Indonesian Institute of Sciences

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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.
Pembuatan Prototipe Dye Sensitized Solar Cell (DSSC) Menggunakan Antosianin Dari Dye Bunga Kenikir (Cosmos Caudatus L.) dan Bunga Zinnia ( Zinnia Peruviana) Dwioknain, Eunike; Hardianti, Hardianti; Tahir, Dahlang; Gareso, Paulus Lobo
Jurnal Fisika FLUX Vol 16, No 1 (2019): Jurnal Fisika Flux Edisi Februari 2019
Publisher : Lambung Mangkurat University Press

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Abstract

Prototype dye sensitized solar sel (DSSC) menggunakan antosianin dari bunga Kenikir (Cosmos Cudatus L.) dan bunga Zinnia (Zinnia Peruviana) untuk pertama kalinya telah di fabrikasi. Prototype DSSC dibuat dalam bentuk struktur sandwich, dengan menggunakan metode spin coating untuk deposisi lapisan TiO2., Kemudian dikarakterisasi  menggunakan XRD yang menunjukkan Kristal TiO2 berada pada fase anatase, dengan ukuran Kristal sebesar 37,99 nm menggunakan persamaan Debye Scherrer dan 30,10  nm menggunakan metode UDM. Hasil spektrum UV-Vis dalam rentang 300 nm - 800 nm, memperlihatkan absorbansi masing-masing untuk dye bunga Zinnia, bunga Kenikir, dan dye campuran adalah 331 nm; 328 nm; 327 nm. Hasil FTIR menunjukkan adanya senyawa antosianin pada bahan dye yang ditunjukkan dengan adanya ikatan senyawa flavonol, karboksil dan hikdroksil. Keluaran yang di hasilkan dari prototype DSSC berupa arus dan tegangan yang kemudian di akumulasi untuk menghitung efisiensi  DSSC. Efisiensi DSSC sebesar 0,0193 % pada dye bunga Zinnia dengan lama perendaman 66 jam. Efisiensi dari DSSC yang terbaik adalah dye dari bunga Zinnia bila dibandingkan dengan bunga Kenikir dan  campuran dye dari bunga Kenikir dan bunga Zinnia.
Fabrikasi Bahan Penyerap Gelombang Elektromagnetik Berbasis CuC Hendri, Hendri; Abdullah, Bualkar; Tahir, Dahlang
Jurnal Fisika FLUX Vol 15, No 2 (2018): Jurnal Fisika FLUX Edisi Agustus 2018
Publisher : Lambung Mangkurat University Press

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Abstract

Fabrikasi bahan penyerap gelombang elektromagnetik berbasis CuC telah dilakukan. Tembaga Karbon (CuC) diolah dengan metode kompaksi/pemadatan, karakterisasi dilakukan dengan menggunakan XRD, FTIR dan VNA. Penyerap gelombang elektromagnetik (reflection loss (RL)) diperoleh pada rentang -17,73 dB hingga -24,94 dB. Nilai RL dipengaruhi oleh konsentrasi karbon aktif (AC). Spectrum RL terbaik diperoleh pada frekuensi 4 GHz – 5 GHz.
Analysis Optical Properties of Carbon Dots from Paper Flowers (Bougainvillea spectabilis) Ramlan, Nurul Mutmainnah; A'yun, Arini Qurrata; Putri, Radha Hartina; Fatimah, Siti; Isnaeni, .; Tahir, Dahlang
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 2 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

Synthesized carbon dots (CDs) from paper flowers (Bougainvillea spectabilis) was performed by microwave assisted. CDs were characterized by ultraviolet visible light (UV-Vis), photoluminescence (PL) and time resolved luminescence (TRPL). PL data shows wavelength intensity of CDs paper flowers at 493 nm for 3.9 ns and 512 nm for 4.2 ns respectively for purple and white paper flowers that excited at 420 nm. The absorbance for CDs white paper flower at 262 nm and 350 nm, while CDs purple flower paper at 260 nm, 324 nm, and 530 nm. CDs from paper flower shows excellent optical properties. So, it is mean that method applied to this experiment effectively, cheap and eco-friendly for synthesis CDs from paper flower.