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<![CDATA[ESTIMASI UKURAN KRISTAL DAN PARAMETER ELASTISITAS NANOKRISTAL ZnO:Ce MENGGUNAKAN METODE SIZE-STRAIN PLOT ]]>
<![CDATA[Kinasih, Diah Ayu Suci]]>;
<![CDATA[Nurhasanah, Iis]]>
<![CDATA[ BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika ]]>
Publisher : <![CDATA[BERKALA FISIKA ]]>
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<![CDATA[The physical properties of nanocrystals depend on the crystallite size that correlates with the characteristics of the crystal structure. This research aims to estimate the crystal size and elasticity parameters of ZnO:Ce nanocrystals based on x-ray profile analysis using the sizestrain pot method. Nanocrystal of ZnO:Ce was synthesized using the precipitation method with a calcination temperature of 500 oC. X-ray diffraction measurements were used to analyze the crystal structure of ZnO:Ce. Identification of x-ray diffraction peaks revealed the formation of ZnO:Ce nanocrystals with hexagonal wurtzite structure and lattice parameter smaller than bulk ZnO. The crystal size of 112 nm and the correlation coefficient of 0.97 obtained from the sizestrain plot method is greater than the Scherrer formula. These results indicate that lattice strain contributes significantly to the broadening of the spectrum profile of x-ray diffraction peaks of ZnO:Ce nanocrystal.]]>
<![CDATA[ANALISIS PERMUKAAN NANOPARTIKEL FERIT SENG BERDASARKAN ADSORPSI ISOTERM GAS NITROGEN ]]>
<![CDATA[Kadarisman, Kadarisman]]>;
<![CDATA[Nurhasanah, Iis]]>
<![CDATA[ BERKALA FISIKA Vol 23, No 3 (2020): Berkala Fisika ]]>
Publisher : <![CDATA[BERKALA FISIKA ]]>
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<![CDATA[This research aims to analyze surface characteristic of zinc ferrite nanoparticles based on the N2 adsorption isotherm. The morphology and size of zinc ferrite nanoparticles were observed using a scanning electron microscope. Analysis of N2 adsorption isotherm using the Brunauer- Emmett-Teller equation obtained a specific surface area of 9.78 m2/g and mesoporous structure.   Zinc ferrite nanoparticles were composed of spherical primary particles with a diameter of 67 nm. The size of the nanoparticles obtained from the specific surface area analysis was greater than the scanning electron microscope image analysis. This finding shows that zinc ferrite nanoparticles are agglomerating to form larger secondary particles.Keywords: Zinc ferrite, nanoparticle, surface area, agglomeration ]]>
<![CDATA[PENGARUH ENERGI AKTIVASI TERHADAP AKTIVITAS NANOPARTIKEL ZnFe2O4 PADA ADVANCED OXIDATION PROCESSES (AOPs) SEBAGAI PENGURAI RHODAMINE B ]]>
<![CDATA[Kadarisman, Kadarisman]]>;
<![CDATA[Nurhasanah, Iis]]>
<![CDATA[ BERKALA FISIKA Vol 24, No 1 (2021): Berkala Fisika ]]>
Publisher : <![CDATA[BERKALA FISIKA ]]>
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<![CDATA[Advanced Oxidation Processes (AOPs) is one of the methods used to treat organic dye waste. Powder-based AOPs as photocatalyst have disadvantages due to surface adsorption and agglomeration, thereby reducing the percentage of dye decomposition. In this study, the addition of chemical energy (photo-Fenton-like) and ultrasonic waves (sono-photocatalyst) in the photocatalyst process was used to increase the activity of powder-based photocatalyst material as a decomposer of Rhodamine B organic dye. The photocatalyst material used was ZnFe2O4 nanoparticles synthesized using precipitation method with a calcination temperature of 700oC for 3 hours. The combination of light energy (4.69 eV) and chemical energy (44 meV) in the photo- Fenton-like process showed the highest percentage of Rhodamine B decomposition (70%). The use of ultrasonic energy (28 meV) in the sono-photocatalyst process increases the rate of decomposition of RhB by 2 times. The addition of chemical energy (44 meV) increased the photocatalyst activity of ZnFe2O4 nanoparticles on decomposition of RhB by 8 times. The results showed that the addition of chemical energy to the photocatalyst activity of ZnFe2O4 was much more efficient than the addition of ultrasonic energy.]]>
<![CDATA[KARAKTERISTIK ARUS FILM TIPIS CeO2 DAN Nd-CeO2 YANG DIDEPOSISIKAN DI ATAS SUBSTRAT Si(100) MENGGUNAKAN TEKNIK PULSED-LASER ABLATION DEPOSITION (PLAD) ]]>
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Khairurrijal Khairurrijal]]>;
<![CDATA[Mikrajudin Abdullah]]>;
<![CDATA[Bambang Ariwahjoedi]]>;
<![CDATA[Maman Budiman]]>;
<![CDATA[Sukirno Sukirno]]>
<![CDATA[ Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006 ]]>
Publisher : <![CDATA[Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency ]]>
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DOI: 10.17146/jusami.2006.0.0.5178
<![CDATA[KARAKTERISTIK ARUS FILM TIPIS CeO2 DAN Nd-CeO2 YANG DIDEPOSISIKAN DI ATAS SUBSTRAT Si(100) MENGGUNAKAN TEKNIK PULSED-LASER ABLATION DEPOSITION (PLAD). Karakteristik arus film tipis CeO2 dan Nd-CeO2 yang dideposisikan di atas substrat p-Si(100) menggunakan teknik Pulsed-Laser Ablation Deposition (PLAD) telah diamati melalui pengukuran arus-tegangan (I-V). Film tipis CeO2 memiliki rapat arus yang lebih besar 2 orde dari film tipis Nd-CeO2. Perbedaan rapat arus dapat dijelaskan berdasarkan perbedaan orientasi kristal, keadaan trap dan tinggi potensial penghalang. Mekanisme konduksi yang terjadi terutama adalah Space-Charge Limited Current (SCLC) pada tegangan rendah dan emisi Schottky pada tegangan tinggi. Diketahui pula bahwa potensial penghalang film tipis Nd-CeO2 lebih besar dari film tipis CeO2 dan memberikan kontribusi terhadap penurunan rapat arus.]]>
<![CDATA[Synthesized of Double Layer Thin Film ZnO/ZnO:Ag by Sol-Gel Method for Direct Blue 71 Photodegradation ]]>
<![CDATA[Heri Sutanto]]>;
<![CDATA[Singgih Wibowo]]>;
<![CDATA[Eko Hidayanto]]>;
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Hady Hadiyanto]]>
<![CDATA[ Reaktor Volume 15 No.3 April 2015 ]]>
Publisher : <![CDATA[Dept. of Chemical Engineering, Diponegoro University ]]>
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DOI: 10.14710/reaktor.15.3.175-181
<![CDATA[The objective of this paper is to synthesize and to characterize a single and a double layer ZnO and ZnO/ZnO:Ag thin films and their application for degradation of direct blue 71. Double layer (DL) thin films of zinc oxide and silver-doped zinc oxide (ZnO/ZnO:Ag) were deposited on the substrate glass by using sol-gel spray coating technique. Ag doping variations (2, 4, 6 and 8 %mol) into ZnO were studied. X-Ray Diffractometer (XRD) and UV-Vis spectrophotometer were used to analyze structure and optical properties of thin films. Direct Blue 71 (DB71) was used for photocatalytic evaluation under UV light irradiation. XRD result showed that all prepared thin films have wurtzite structure with better crytalinity compared to double layer preparation and increasing concentration of Ag doping. UV-Vis transmittance spectra showed that decreasing of transparency of films followed by DL preparation and Ag doping concentration. By using envelope method, energy gap of films can be determined. ZnO/ZnO:Ag 6% (DL 6%) indicated the smallest energy gap 3,038 eV. The highest DB71 degradation result under UV light irradiation was reached by DL 6% with 55.43% and 8.56 x 10-3 min-1 for photocatalytic efficiency and photodegradation rate, respectively.]]>
<![CDATA[THE CALCINATION TEMPERATURE EFFECT ON THE ANTIOXIDANT AND RADIOPROTECTION PROPERTIES OF CeO2 NANOPARTICLES ]]>
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Weni Safitri]]>;
<![CDATA[Tri Windarti]]>;
<![CDATA[Agus Subagio]]>
<![CDATA[ Reaktor Volume 18 No. 1 March 2018 ]]>
Publisher : <![CDATA[Dept. of Chemical Engineering, Diponegoro University ]]>
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DOI: 10.14710/reaktor.18.1.22-26
<![CDATA[The CeO2 nanoparticles are very interesting to be studied as biomedical materials due to its unique physical and chemical properties. The non-stoichiometric properties of CeO2 play a role in the redox/catalytic processes that scavenging free radicals. These properties make CeO2 nanoparticles as being potentially antioxidant and radioprotector materials. In this paper, we report the calcination temperature effect on the antioxidant properties and radioprotective effect of CeO2 nanoparticles synthesized by precipitation method. The CeO2 nanoparticles were synthesized by precipitation method at various calcinations temperatures (300oC – 700oC). The formation of CeO2 nanoparticles and crystallite size was analyzed using X-ray diffractometers. The DPPH method was used to investigate antioxidant properties of CeO2. Dose Enhancement Factor (DEF) of CeO2 nanoparticles were determined by measurement of the absorbed dose of X-ray radiation (Linac 6 MV 200 MU). X-ray diffraction pattern showed formation of cubic fluorite of CeO2 nanoparticles with crystallite size in the range 9 nm-18 nm. Calcination temperature of 500oC resulted in CeO2 nanoparticles with the best antioxidant properties and lowest DEF value. The radioprotection effect of CeO2 nanoparticles was evaluated based on Escherichia coli survival toward X-ray radiation with a dose of 2 Gy. The CeO2 nanoparticles increased Escherichia coli survival of about 24.8% order. These results suggested that CeO2 nanoparticles may potentially be as radioprotector of X-ray Linac 6 MV. Keywords: Antioxidant, CeO2 nanoparticles, Dose Enhancement Factor (DEF), radioprotector]]>
<![CDATA[PENGARUH LAJU MOLAR Mn LARUTAN TERHADAP MIKROSTRUKTUR FILM LAPISAN GaN: Mn YANG DIDEPOSISI DI ATAS SUBSTRAT Si MENGGUNAKAN METODE CSD ]]>
<![CDATA[Heri Sutanto]]>;
<![CDATA[Eko Hidayanto]]>;
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Nursidi Yunanto]]>;
<![CDATA[Isrina Nur Laili]]>;
<![CDATA[. Istadi]]>
<![CDATA[ Prosiding SNST Fakultas Teknik Vol 1, No 1 (2011): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 2 2011 ]]>
Publisher : <![CDATA[Prosiding SNST Fakultas Teknik ]]>
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<![CDATA[Abstrak Telah dilakukan deposisi lapisan tipis material GaN:Mn dengan metode chemical solution deposition (CSD) menggunakan teknik spin-coating. Larutan gallium-maganese-citrate-amine disintesis menggunakan Ga2O3 sebagai sumber galium dan MnO2 sebagai sumber mangan. Larutan divariasi dengan fraksi mol larutan Mn dari 55-80%. Kristal berwarna coklat yang terbentuk selanjutnya dilarutkan dalam ethylenediamine membentuk gel. Gel selanjutnya dilapiskan di atas substrat Si dengan spin-coater pada laju 1100 rpm. Lapisan yang terbentuk kemudian disintering pada temperatur 900oC pada lingkungan gas N2 UHP supaya terjadi dekomposisi membentuk GaN:Mn. Hasil analisis spektrum energy dispersive of X-Ray (EDX) menunjukkan inkorporasi Mn ke dalam GaN meningkat dengan penambahan fraksi mol larutan Mn pada larutan yang digunakan. Hasil Uji EDX menunjukkan bahwa film tipis GaN:Mn terdapa impuritas karbon (C) hingga 36,71%. Citra scanning electron microscopy (SEM) lapisan tipis GaN:Mn menunjukkan secara umum telah diperoleh kekasaran permukaan (rms) morfologi lapisan mencapai orde nanometer hingga 24,36 nm. Dari hasil yang telah diperoleh menunjukkan bahwa metode deposisi CSD telah mampu menghasilkan lapisan tipis semikonduktor magnetik dengan morfologi permukaan yang hampir homogen. Dengan demikian metode CSD ini dapat dikembangkan untuk metode alternatif deposisi lapisan tipis yang ekonomis dan sederhana. Kata kunci: GaN:Mn, CSD, Lapisan Tipis, Inkorporasi Mn]]>
<![CDATA[PENGUJIAN SIFAT FOTOKATALIS LAPISAN TIPIS TiO2 PADA PRODUK DEGRADASI JELANTAH MENGGUNAKAN ELEKTROOPTIS ]]>
<![CDATA[Ummi Kaltsum]]>;
<![CDATA[Affandi Faisal Kurniawan]]>;
<![CDATA[P Priyono]]>;
<![CDATA[Iis Nurhasanah]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 7 No. 2 (2017) ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v7n2.p61-67
<![CDATA[Mutu jelantah lebih rendah dibandingkan minyak goreng baru, karena mengandung produk-produk degradasi (radikal bebas, molekul lemak jenuh, total polar material, dan polimer). Jumlah produk degradasi dalam jelantah dapat diturunkan menggunakan lapisan tipis TiO2 yang memiliki sifat fotokatalis. Lapisan tipis TiO2 dibuat dengan mencampurkan TTiP dan AcAc dengan perbandingan molar 1:2. Campuran dideposisikan di atas substrat kaca dengan metode spray coating pada suhu 450 oC. Sebagian lapisan tipis yang sudah di-coating kemudian dianil pada suhu 500 oC selama 2 jam. Proses penurunan produk degradasi dalam minyak goreng dilakukan menggunakan lapisan tipis TiO2 tanpa anil dan lapisan tipis TiO2 yang dianil secara terpisah melalui proses fotokatalis. Proses fotokatalis dilakukan menggunakan matahari selama 5 jam. Keberadaan produk-produk degradasi dalam minyak goreng dikaji berdasarkan perubahan sudut polarisasi cahaya minyak goreng. Besarnya perubahan sudut polarisasi minyak goreng sebanding dengan jumlah produk degradasi. Tidak ada perbedaan yang signifikan pada kedua jenis lapisan tipis TiO2 dalam menurunkan produk degradasi. Setelah proses fotokatalis selama 5 jam, kedua jenis lapisan tipis TiO2 berhasil menurunkan jumlah produk degradasi yang sama yaitu hingga 71,43%. Hasil tersebut menunjukkan kedua jenis lapisan tipis TiO2 mampu mengurangi produk degradasi dalam jelantah.]]>
<![CDATA[SENSITIVITAS LARUTAN NANOPARTIKEL CeO2 TERHADAP RADIASI SINAR GAMMA TELETERAPI COBALT-60 ]]>
<![CDATA[Agus Bashori]]>;
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Zaenal Arifin]]>
<![CDATA[ Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
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<![CDATA[Gamma rays are ionizing radiation that are useful to kill cancer cells through radiation therapy, but radiation would be dangerous if the user escapes scrutiny. In this case the required dosimeter to detect its existence. Practically daily dose allowed for radiotherapy ranges from 1.8 Gy to 2 Gy therefore needed dosimeter capable of detecting a range of doses. This study has been conducted testing sensitivity to gamma radiation to a solution of CeO2 nanoparticles, each of which is synthesized at a temperature of 400°C with a concentration of 2.5 x 10-4 g / ml. CeO2 nanoparticle solution is then analyzed using a UV-Vis spectrophotometer before and after irradiated. Gamma radiation with an energy of 1.33 MV administered at doses varying from 1 Gy to 3 Gy. The test results in the form of UV-Vis absorbance spectrum CeO2 nanoparticle solution which is used as a reference to determine changes in absorbance (ΔA) and value-G. Absorbance spectrum showed absorbance increased to dosing and a strong absorbance occurs at a wavelength of 297 nm for a solution of CeO2 nanoparticles were synthesized at a temperature of 400°C. Sensitivity solution CeO2 nanoparticles seen from the changes absrobansi and value-G. Gamma radiation dosing provide value change in absorbance of about 1.50 x 10-2 to 2.50 x 10-2 and values around 0.095 molJ-1 to 0,439 molJ-1 to a solution of CeO2 nanoparticles were synthesized at a temperature of 400°C. These values indicate that the solution of CeO2 nanoparticles have a sensitivity to gamma radiation.]]>
<![CDATA[STUDI PENGAPLIKASIAN EFEK FOTOKATALIS DARI LAPISAN ZnO:Ag TERHADAP DEGRADASI BAKTERI E.coli ]]>
<![CDATA[Ndaru Adyono]]>;
<![CDATA[Heri Sutanto]]>;
<![CDATA[Iis Nurhasanah]]>
<![CDATA[ Youngster Physics Journal Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
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<![CDATA[Research in the field of green technology using photocatalyst materials can be a solution to environmental pollution, especially contamination of aquatic bacteria. These materials absorb energy from the sun and form hydroxyl radicals that kill bacteria. Zinc oxide has a high photocatalytic efficiency with Eg 3.3 eV in the range of UV - visible light. ZnO can be modified by addition of silver in order to improve the effectiveness as well as anti-bacterial properties. ZnO:Ag 4% layers prepared with thermal spray coating method with deposition temperature at 250ºC and aneling temperature at 450 ºC. XRD measurements performed with CuKα radiation with wavelength at 1.54060 Å and the diffraction angle in range 20 ° - 70 °. The diffraction patterns were identified using the Crystallography Open Database (COD) and software QUALX. ZnO (Id 101-1259) phase and metal Ag (Id 151-2487) phase has formed, but there are also silver oxide phase AgO (Id 150-9488) and Ag2O (Id 150-9684). Crystallite size has been calculated using Debye-Scherrer equation resulted an average value 43.46 nm. The optical properties were measured using a UV-Vis spectrometer in the wavelength range 250-800 nm. Transmittance spectrum were converted into an absorbance spectrum using the Beer-Lambert law. Eg value were analyzed with methods tauc's plot. Linear extrapolation (αhν)2 against hν provide direct transition Eg value 3.1 eV. Photodegradation ability of ZnO:Ag layer performed on E.coli bacteria. TPC measurement results were analyzed using the degradation rate graph, Ct (bacteria concentration) against time exposure. The degradation rate values obtained 1.554 x 10-17 (cfu/ml)-2(minutes)-1.Keywords : ZnO:Ag, band gap energy, XRD, Uv-Vis, TPC, degradation rate.]]>
