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RANCANG BANGUN ALAT UKUR KONDUKTANSI LISTRIK OTOMATIS BERBASIS MIKROKONTROLER ATMEGA8535 Harjono, Dwi; Aminudin, Ahmad; Syarif, Dani Gustaman
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Publisher : Jurusan Pendidikan Fisika

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Abstract

Kegiatan penelitian sifat kelistrikan bahan dalam rangka  pengembangan komponen elektronik, membutuhkan sebuah alat ukur yang teliti dan user friendly. Berkaitan dengan itu telah dirancang dan dibuat sebuah alat ukur konduktansi listrik bahan pada berbagai suhu. Alat ukur ini memiliki modul penguat sinyal sensor suhu, penguat sinyal arus dan tegangan, modul mikrokontroler berbasis ATMega8535, dan rangkaian penampil LCD 16 × 2. Alat ini dapat terhubung dengan personal computer (PC) untuk mencatat data pengukuran secara otomatis dengan bantuan dari software. Alat mampu mengukur mengukur hambatan pada rentang 10 kΩ hingga 1 MΩ pada berbagai suhu dari 25 °C hingga 500 °C. Alat ini dapat beroperasi dengan baik, namun masih butuh pengembangan lebih lanjut.
PENGARUH WAKTU DAN SUHU PERLAKUAN PANAS MENGGUNAKAN GAS HIDROGEN TERHADAP SIFAT LISTRIK TERMISTOR NTC BERBASIS Fe2TiO5 Kamal, Jaenudin; Syarif, Dani Gustaman; Wiendartun, Wiendartun
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Publisher : Program Studi Fisika

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Perlakuan panas termistor NTC berbasis Fe2TiO5 yang di doping MnO2 telah dilakukan. Pelet termistor Fe2TiO5 dibuat dari bahan Fe2O3, TiO2,dan MnO2. Pelet mentah yang diperoleh, disinter pada suhu 1050oC selama 3 jam dalam atmosfer gas oksigen. Resistansi pelet diukur pada suhu 30-200oC dengan interval 10oC. Selesai pengukuran resistansi, pelet diberi perlakuan panas pada suhu 300oC di dalam atmosfer gas hidrogen. Besarnya waktu perlakuan panas divariasi yaitu selama 5, 15, dan 25 menit. Hasilnya, terjadi penurunan resistivitas suhu ruang (ρSR) pada keramik seiring peningkatan waktu perlakuan panas dengan nilai masing-masing sebesar 427,444 MΩ.cm, 27,877 MΩ.cm, dan 1,056 MΩ.cm. Demikian nilai konstanta termistor (B) dari masing-masing waktu perlakuan panas didapatkan sebesar 6013 K, 4102 K, dan 3459 K. Perlakuan panas juga dilakukan pada suhu yang bervariasi yaitu 250oC, 350oC, dan 450oC untuk waktu yang tetap. Hasilnya, terjadi penurunan nilai ρSR pada keramik seiring peningkatan suhu perlakuan panas dengan nilai masing-masing sebesar 421,78 MΩ.cm, 78,609 MΩ.cm, dan 0,056 MΩ.cm. Demikian nilai konstanta termistor (B) dari masing-masing suhu perlakuan panas didapatkan sebesar 4038 K, 3729 K, dan 4053 K. Berdasarkan nilai ρSR dan B yang diperoleh, keramik yang diberi perlakuan panas ini telah memenuhi kebutuhan pasar. Struktur kristal keramik sebelum dan sesudah perlakuan panas dianalisis dengan XRD. Hasil analisis XRD menunjukkan keramik Fe2TiO5 doping MnO2 mempunyai struktur kristal orthorombik dan tidak terjadi perubahan struktur kristal pada kondisi sebelum dan sesudah perlakuan panas. Kata Kunci   :  Fe2O3, TiO2, MnO2, perlakuan panas.
PENGARUH KONSENTRASI CuO DAN ZnO TERHADAP KARAKTERISTIK TERMISTOR NTC BERBASIS (𝐶𝐶𝑥𝑍𝑍𝑦𝑀𝑀 𝑧𝑁𝑁𝑡)𝐹𝐹2𝑂4 Respati, Aria; Syarif, Dani Gustaman; Rusdiana, Dadi
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Publisher : Program Studi Fisika

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Telah dilakukan penelitian tentang pembuatan film tebal untuk termistor NTC berbasis (𝐶𝐶𝑥𝑍𝑍𝑦𝑀𝑀 𝑧𝑁𝑁𝑡)𝐹𝐹2𝑂4. Termistor ini berbahan dasar CuO, ZnO, MnO, NiO, dan 𝐹𝐹2𝑂3 dengan variasi konstrasi CuO dan ZnO berturut-turut dalam persen massa adalah (15 dan 5), (10 dan 10) dan (5 dan 15). Penelitian ini bertujuan mendapatkan komposisi yang optimal yang memiliki karakterisitik yang paling baik. Hasil karakterisasi listrik menunjukan tahanan suhu ruang meningkat dari komposisi 1 ke komposisi 3 yaitu (3,84 M𝛺), (11,78 M𝛺) dan (25,94 M𝛺). Harga konstanta B dari komposisi 1 ke 3 adalah (3046 K), (3962 K), dan (3397 K) semua memenuhi kebutuhan pasar . Pola difraksi menunjukkan bhwa semua komposisi berstrktur kubik spinel dan struktur membaik dari komposisi 1 ke 3, ditunjukkan dengan semakin sedikitnya puncak-puncak selain fasa spinel. Analisis SEM menunjukkan bahwa dari komposisi 1 ke 3 stuktur mikronya semakin membaik, itu ditunjukkan dari semakin sedikitnya bulir-bulir berukuran kecil dan semakin tumbuhnya bulir-bulir besar yang diduga kuat adalah fasa spinel. Dengan demikian komposisi yang paling optimal adalah komposisi 2.
Pembuatan Keramik Dielektrik Dari Sistem (ZnO-TiO2) Pada Suhu Sinter 1450°C dan Karakterisitiknya Firmansyah, Lutfi; Suhandi, Andi; Syarif, Dani Gustaman
MESIN Vol 9, No 2 (2007): MEMINIMALKAN KERUGIAN KAMPUS AKIBAT BANJIR
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Formation Dielectric Ceramic from (ZnO-TiOJ System at 1450C SinteringTemperature and Their Characteristics, Synthesis of dielectric ceramics from (ZnO-TiOJ system at145&C and their characterization had been carried out. This investigation was done in order to knowthepossibility of the application of the ceramics for dielectric ceramics. The ceramics were produced bymixing powder ofZnO and Ti02 with the concentration in such away so that the concentration ofTiO?larger than thestoichiometric concentration ofZn2Ti04 andbysintering at I450"C. Characterization wascarriedout through XRD, microstructural and electrical analyses. The XRDand microstructure analysesshowed that the (ZnO-TiOJ system ceramics formed Zn2.xTi.x04 solid solution which accompanied bytheformation ofZn vacancy defect. No second phasefound in the ceramics. Lattice constant ofthe Zn2.xTii x04solid solution decreasedfollowing the increase ofthe concentration ofTi02 excess (expressed byx). The Ti02 excess affected the grain size of the Zn2.xTi, x04 ceramics although the effect was notsignificant. At high temperature, the excess of Ti02 increased the dielectric constant and dissipationfactor. The ceramicsproduced in this work had relatively low dielectric constant and loss tangent andgood stability in relation to temperature change, so they can be applied as ceramic substrate andcapasitor dielectric.
KARAKTERISASIKERAMIK TERMISTOR Fe203:lmTi HASIL SINTER DAN PERLAKUAN PANAS Syarif, Dani Gustaman
MESIN Vol 9, No 1 (2007): Bahan Bakar Alternatif
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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This studywas done to know the effect ofTi02 addition on the characteristics qfFe203ceramics and the effect of a heat treatment at low temperature on the electrical characteristics ofFe203:lmTi ceramics including the mechanism ofits change as well. The Fe203:lmTi ceramics wereproduced bysintering some green pellets from mixture of 99.9 mole %Fe203 and I mole %Ti02 at1200°C for I hour in air. A heat treatment was carried out at 75(fC in air with a cooling rate ofTC/minute. Electrical resistivity ofthe ceramics was measured at different temperatures before andafter heat treatment. X-ray diffraction (XRD) analysis was done to know the crystal structure of theceramics and phases formed therein. It was known that the crystal structure of the Fe203 andFe203:lmTi ceramics was thesame i.e. that similar to hematite. The electricalcharacteristics showedthat the room temperature resistivity (psn) of the Fe203 ceramics drastically decreased with I mole %Ti02 addition and showedthat the (pSR) oftheFe203:lmTi ceramics increased significantly while thevalue of the thermistor constant (B) relatively did not change, after the heat treatment. The increase of(psn) after the heat treatment was caused by lessformation of oxygen vacancies which behave as theelectron sourcefor conduction band.
STUDI APLIKASI KERAMIK ZnBiCo SEBAGAI TERMISTOR NTC Syarif, Dani Gustaman; Henny, Henny; Suhandi, Andi
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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STUDY ON THE APPLICA TION OF ZnBiCo CERAMICS AS NTC THERMISTORS. A study onthe application ofZnO-Bi203-CoO (ZnBiCo) ceramicsfor NTC thermistors had been carried out. The aim ofthisstudywas tofind alternative NTCthermistors. The studywas done as follow. Powder ofZnO, CoO andBi203 with concentration of Bi203 of 0, 0.25, 0.5, and 0.75 mole % and of CoO of 2 mole % werehomogeneously mixed. The mixedpowder was pressed with pressure of3.9ton/cm2 into pellets and sinteredat HOCfC in airfor 1 hour. The sintered pellets were evaluated using x-ray diffraction (XRD), opticalmicroscope andSEM(Scanningelectron microscope). Resistivity-temperature characteristic (p-Tcurve) wasdetermined through measurement of resistivity at various temperatures from room temperature to WCfC.XRD andmicrostructure datashowed thatmostofCoOformed a solid solution withZnOmatrix while Bi203was segregated at grain boundaries as ZnO,24Bi203 second phase. It was known that the all ceramicsproducedin this studyhad the same structure i.e. hexagonal. It was known also that the addition ofBi203increased the average grain size of the ZnBiCo ceramics. Electrical data showed that Bi203 increased theroom temperature resistivity (ps^) and the thermistor constant (B) of the ZnBiCo ceramic thermistors. Thethermistor constant and sensitivity (a) of the thermistor ceramics in this study were relatively high (largerthan 200(fKfor Band larger than 2.2 (°K)~lfor a)andsuitableforcommercial application.
Pengaruh Heat Treatment Terhadap Karakteristik Listrik Termistor NTC Berbasis (CuxMnyZnzNit)Fe2O4 Dilaga, Jovi Kusuma; Syarif, Dani Gustaman; Wiendartun, Wiendartun
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Publisher : Program Studi Fisika

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Pengaruh Heat Treatment Terhadap Karakteristik Listrik Termistor NTC Berbasis (CuxMnyZnzNit)Fe2O4. Telah dilakukan pembuatan film tebal termistor NTC dengan mencampukan bahan yang terdiri dari CuO 15%, MnO 20%, ZnO 5%, NiO 30% dan Fe2O3 30% dan digerus selama 30 menit lalu ditambah OV (Organic Vehicle) untuk bahan pasta dan dilapiskan diatas substrat alumina dengan metode screen printing dan disinter pada suhu 11000C. nilai resistivitas setelah uji resistivitas sebesar 0.808 Mohm.cm dan mengalami penurunan nilai resistivitas setelah heat treatment. Pada hasil difraksi sinar-x didapat pola yang tidak beraturan yang kemungkinan merupakan pengaruh dari bahan penyusun film tebal. Hasil SEM menunjukan struktur yang berongga. Pada sampel satu didapat besar nilai nilai konstanta termistor sebesar 3925.10K dan yang terbesar dibandingkan HT1 dan HT2. Namun hal ini menunjukan bahwa sampel yang dapat digunakan baik dalam termistor adalah saat awal dengan nilai konstanta termistor tersebut maka masuk ke dalam termistor pasar dimana untuk kebutuhan pasar nilai konstanta termistor adalah ≥20000K.
SYNTHESIS OF ZrO2 VIA ULTRASONIC ASSISTED PRECIPITATION METHOD FOR PHOTODEGRADATION OF METHYLENE BLUE Soni Setiadji; Nur Tursina; Nanda Dwimar Hakim; Sanusi Sanusi; Tety Sudiarti; Dani Gustaman Syarif
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.6807

Abstract

Zirconium dioxide (ZrO2) is a semiconductor material which its photocatalytic properties for degradation of methylene blue has been investigated in this research. ZrO2 was prepared from ZrCl4 solution by adding NaOH through precipitation method without ultrasonication, and also with ultrasonication for 1 h and 2 h. The specimens of ZrO2 were analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET). The XRD of all ZrO2 samples showed that the smallest ZrO2 crystal size was 8.149 nm based on Debye-Scherrer calculations for ultrasonic time of 2 h. The lattice parameter of ZrO2 under tetragonal phase was analyzed using Rietvield refinement by La Beil method. The specific surface area of all ZrO2 specimens were confirmed by BET. The result showed specific surface area of 99.741 m2/g for treatment with 2 h ultrasonication. The effect of ultrasonic assisted precipitation could increase the photocatalytic activity. This result showed that the degradation of methylene blue by ZrO2 with 2 h ultrasonication is higher than both by ZrO2 with 1 h ultrasonication and ZrO2 without ultrasonication with values of 93.00 %, 88.32 % and 77.53 % respectively, at 120 min irradiation, pH of 10 and 0.05 g of ZrO2 
SYNTHESIS OF ZrO2 VIA ULTRASONIC ASSISTED PRECIPITATION METHOD FOR PHOTODEGRADATION OF METHYLENE BLUE Soni Setiadji; Nur Tursina; Nanda Dwimar Hakim; Sanusi Sanusi; Tety Sudiarti; Dani Gustaman Syarif
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.6807

Abstract

Zirconium dioxide (ZrO2) is a semiconductor material which its photocatalytic properties for degradation of methylene blue has been investigated in this research. ZrO2 was prepared from ZrCl4 solution by adding NaOH through precipitation method without ultrasonication, and also with ultrasonication for 1 h and 2 h. The specimens of ZrO2 were analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET). The XRD of all ZrO2 samples showed that the smallest ZrO2 crystal size was 8.149 nm based on Debye-Scherrer calculations for ultrasonic time of 2 h. The lattice parameter of ZrO2 under tetragonal phase was analyzed using Rietvield refinement by La Beil method. The specific surface area of all ZrO2 specimens were confirmed by BET. The result showed specific surface area of 99.741 m2/g for treatment with 2 h ultrasonication. The effect of ultrasonic assisted precipitation could increase the photocatalytic activity. This result showed that the degradation of methylene blue by ZrO2 with 2 h ultrasonication is higher than both by ZrO2 with 1 h ultrasonication and ZrO2 without ultrasonication with values of 93.00 %, 88.32 % and 77.53 % respectively, at 120 min irradiation, pH of 10 and 0.05 g of ZrO2 
EVALUATION OF MINERAL-BASED HYDROXYAPATITE/ZnO COMPOSITES AS PHOTOCATALISTS FOR METHYLEN BLUE DEGRADATION Hardian, Arie; Nafisah, Aulia Zakiyatun; Karya, Teguh; Halim, Riyan; Murniati, Anceu; Syarif, Dani Gustaman; Noviyanti, Atiek Rostika; Nurhayati, Mita; Jasmansyah, Jasmansyah; Reza, Muhammad
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 11, No 2 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i2.37886

Abstract

The use of dyes in the textile industry has increased significantly, raising concerns about their potential to pollute the environment and harm human health. Methylene blue is a widely used synthetic dye, necessitating effective methods for its degradation. Photodegradation is a promising approach to decompose dyes into simpler, less harmful compounds. In this study, hydroxyapatite combined with ZnO was employed as a photocatalyst material to enhance photocatalytic performance. The research aims to degrade methylene blue using a Hydroxyapatite/ZnO (HAp/ZnO) nanocomposite through photodegradation. The optimization of the photodegradation process was investigated by varying irradiation time, methylene blue concentration, and pH. The optimum degradation of methylene blue was achieved using 20 mg of HAp/ZnO nanocomposite at an irradiation time of 120 minutes, an initial methylene blue concentration of 5 ppm, and pH 7. Adsorption isotherm modeling revealed that the process followed the Langmuir isotherm model, with a maximum adsorption capacity (qmax) of 0.3353 mg/g. The degradation followed pseudo-second-order kinetics with a reaction rate constant of 4.0026×105 L/mol·s.
Co-Authors - Wiendartun A. Suhandi A.A. Ketut Agung Cahyawan W Abrar Abrar Ahmad Aminudin Anceu Murniati Aria Respati, Aria Arie Hardian Atiek Rostika Noviyanti Dwi Harjono E. Suhendi Halim, Riyan Haryadi, Hendi Jaenudin Kamal, Jaenudin Jasmansyah, Jasmansyah Jenatu, Yolanda Maryani Jovi Kusuma Dilaga, Jovi Kusuma Karya, Teguh Lutfi Firmansyah, Lutfi Muhammad Reza Nafisah, Aulia Zakiyatun Nanda Dwimar Hakim Nur Tursina Nurhayati, Mita Puspita Sari Sanusi Sanusi Soni Setiadji Tety Sudiarti