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All Journal POSITRON Komunikasi Fisika Indonesia JURNAL FISIKA Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Spektra: Jurnal Fisika dan Aplikasinya Indonesian Journal of Chemistry Unri Conference Series: Community Engagement PARAHITA : Jurnal Pengabdian kepada Masyarakat Journal of Applied Agricultural Science and Technology Jurnal Material dan Energi Indonesia Science, Technology, and Communication Journal
Iwantono Iwan Barnawi
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics

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SEL SURYA FOTOELEKTROKIMIA DENGAN MENGGUNAKAN NANOPARTIKEL PLATINUM SEBAGAI ELEKTRODA COUNTER GROWTH Iwantono '; Erman Taer; Rika Taslim; Lutfi Rindang Lestari
Komunikasi Fisika Indonesia Vol 11, No 8 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (483.184 KB) | DOI: 10.31258/jkfi.11.8.553-560

Abstract

Telah dilakukan fabrikasi dan pengukuran sel surya fotoelektrokimia dengan menggunakan nanopartikel platinumpada elektroda counter. Nanopartikel platinum ditumbuhkan di atas permukaan substrat padat (ITO) dengan metodein-situ growth (penumbuhan langsung) pada suhu 50 °C dengan variasi penumbuhan berulang (1 lapisan, 2 lapisan,dan 3 lapisan). Sel surya dibentuk seperti susunan sandwich yang menghubungkan antara elektroda counter(nanopartikel platinum) dan elektroda kerja (nanopartikel ZnO), dengan elektroda kerja diberi perlakuan variasikonsentrasi dan penambahan amoniak. Nanopartikel platinum tumbuh yang memberikan respon baik pada uji seladalah pada penumbuhan 1 lapisan. Hasil pengujian sel di bawah pencahayaan lampu halogen 100 watt, daerah aktifsel 1 cm x 1 cm memperlihatkan karakteristik I-V dengan parameter keluaran, tegangan rangkaian terbuka (V oc ) 274mV, arus rangkaian pendek (I sc ) 0,21 mA, fill factor (FF) 0,96 (96%), daya maksimum (Pmax) 0,056 mW untukvariasi konsentrasi. Sedangkan untuk variasi penambahan amoniak menghasilkan output tegangan rangkaian terbuka(V oc ) 119 mV, arus rangkaian pendek (I sc ) 0,1225 mA, fill factor (FF) 0,76 (76%), daya maksimum (P max ) 0,011 mW.
PENGARUH PENAMBAHAN MATERIAL PLASMONIK PERAK (Ag) TERHADAP SIFAT FISIS NANOROD ZnODENGAN METODE SEED-MEDIATED HYDROTHERMAL Fera Anggelina; Iwantono Iwantono; Lazuardi Umar; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.622 KB) | DOI: 10.31258/jkfi.14.2.1041-1047

Abstract

Penumbuhan nanorod ZnO dengan tambahan material plasmonik Ag telah berhasil dilakukan dengan menggunakan metode seed-mediated hydrothermal melalui 2 proses: pembenihan dan penumbuhan. Penambahan Ag dilakukan setelah penumbuhan nanorod ZnO yang berlangsung pada suhu 90°C selama 8 jam. Pengaruh penambahan Ag terhadap sifat fisis nanorod ZnO dievaluasi dengan menggunakan teknik karakterisasi XRD, FESEM-EDX dan spektroskopi UV-Vis. Spektrum XRD yang dihasilkan sampel tidak memperlihatkan puncak khusus untuk Ag, namun foto FESEM cukup menampakkan bahwa Ag berhasil masuk ke dalam kisi nanorod ZnO. Hal ini diperlihatkan dengan rusaknya penampang permukaan dari nanorod ZnO, ukuran diameter yang tidak seragam, serta orientasi nanorod yang tidak tegak lurus terhadap substrat. Keberadaan Ag sangat jelas diperlihatkan pada uji EDX dengan persentase berat sebesar 0.2%. Penambahan Ag pada nanorod ZnO berdampak positif, terutama pada sifat optik ZnO. Adanya tambahan Ag menambah rentang daya serap sampel dari UV hingga cahaya tampak. Dengan adanya sifat SPR pada sampel, maka penggunaan material aktif ini pada DSSC sangat dimungkinkan mampu menghasilkan efisiensi yang lebih tinggi.
PERANCANGAN PENYEBARAN DAYA PADA SINGLE-MODE FIBER DENGAN MENGGUNAKAN BAHAN LITHIUM NIOBATE (LiNbO3) DAN PARAFIN (C20H42) Teodora Maria Meliati Sinaga; Saktioto '; Iwantono 'PERANCANGAN PENYEBARAN DAYA PADA SINGLE-MODE FIBER DENGAN MENGGUNAKAN BAHAN LITHIUM N
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Optical switch represents good technology components used in many application especially in communication. Optical switch is different from conventional one having many advantageous. Single mode fiber optics is used as a waveguide for propagating the power of Laser Source and detected by power meter. The design is started by connecting single mode fiber optics to the source and detector. The voltage source is measured  corresponding to power meter detector. The result shows that the lowest output power is detected from the paraffin of -39,28 dBm and fiber the output power is -12,67 dBm. The maximum input voltage is 3200 Volt and output voltage is 1061 Volt for optical fiber and the lowest electric field obtained is 223,2 x 10−11A/m2. The current density is 223,2 x 10−11 A/m2  for paraffin with 500 μm in diameter. The output voltage for paraffin 1032 Volt, the electric field of 412,8 x 104 V/m and current densityis 412,8 x 10−11 A with 250 μm in diameter.
PENUMBUHAN NANOPARTIKEL TITANIUM DIOKSIDA PADA SUBSTRAT FTO DENGAN METODE ELEKTRODEPOSISI Saidatun Khofifah; Iwantono '; Awitdrus '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

TiO2 nanoparticles have been grown successfully by electrodeposition method on the surface of Fluorine Tin Oxide (FTO) substrate. The growth of TiO2 nanoparticles was done by using voltage of 2 Volt, 6 Volt, 10 Volt, 14 Volt and 18 Volt. This TiO2 was also demonstrated with two different temperature 37 oC and 50 oC. The samples were characterized by UV-Vis spectroscopy, X-ray Diffraction, Scanning Electron Microscope (SEM) and Energy Dispersion X-ray (EDX). The results of UV-Vis showed that TiO2 nanoparticles have the highest absorption at 18 Voltage. The result of XRD at 18 Volt showed that TiO2 has 5 peaks at 2θ: 25,497o, 38,176o, 38,176o, 51,887o, 54,911 o, and 62,093 o, with their crystal plane (1 1 1), (2 1 1 ), (2 2 2), (3 2 0), (4 0 0). The results of SEM showed that nanoparticles form is nearly spherical at a magnification of 35000 times. The results of EDX of the review indicate that Ti atoms have a percentage atomic of 17.66% and O of 70,39%.
PENUMBUHAN DAN KARAKTERISASI NANOPARTIKEL PERAK PADA SUBSTRAT PADAT Rizky Ardie Yani; Iwantono '; Akrajas Ali Umar
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Silver nanoparticles have been successfully grown on solid substrate. The growth of the particles used wet chemical  method which consisted of two steps, seeding and growing steps. The silver nanoparticle growth was carried out by two variations which were surfactant’s concentration and ascorbic acid’s volume.  The UV-Vis spectrum profile of the samples described that the  growth of silver nanoparticles of spherical shape was dominated on the ITO, represented as a sharp single peak of the absorption spectra. Its characterization measured by XRD showed that silver nanoparticles had grown on the substrate with crystal orientation (1 1 1) and (2 0 0). The FESEM images depicted that the shape of silver nanoparticles was a spherical shape with their uniform diameter size of 300-650 nm.
Strategi penanganan Covid-19 melalui pemberdayaan UMKM dalam memproduksi APD di Kota Pekanbaru Iwantono Iwantono; Genny Gustina Sari; Yohannes Firzal
Unri Conference Series: Community Engagement Vol 2 (2020): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.2.537-540

Abstract

Since March 2020 the spread of the Corona virus has hit almost all parts of the world. The number of victims is increasing while a cure has not yet been found. The angry community then began to take the initiative to save themselves and their families by buying medical devices such as masks, handsanitizers to APD (Personal Protective Equipment) clothes or better known as Hazmat shirts. Unfortunately, the price of these three materials has increased many times over, naughty parties play by piling up goods and then throwing them into the market at an unreasonable price. Do not lose their mind, people rack their brains to take advantage of new business opportunities in the Covid-19 era, including making and mixing their own handsanitizers, sewing masks and of course hazmat suits. The scarcity of these items actually affects the performance of medical personnel. This dedication is made in order to help empower UMKM in Pekanbaru City to try to read the market and produce their hazmat suits themselves. As a result, with the intense competition and the lack of public interest in sewing Hazmat clothes, the service team managed to embrace UMKM that manage their own convection, even though they are on a small scale.
ANALISA DIMENSI, DENSITAS DAN KAPASITANSI SPESIFIK ELEKTRODA KARBON SUPERKAPASITOR DARI BUNGA RUMPUT GAJAH DENGAN VARIASI KONSENTRASI PENGAKTIVAN KOH E. Taer; H. Yusra; Iwantono Iwantono; R. Taslim
Spektra: Jurnal Fisika dan Aplikasinya Vol 1 No 1 (2016): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 1 Nomor 1, Agustus 2016
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.879 KB) | DOI: 10.21009/SPEKTRA.011.09

Abstract

Abstrak Telah dilakukan analisa dimensi, densitas dan kapasitansi spesifik pada pembuatan elektroda karbon superkapasitor dari bunga rumput gajah menggunakan variasi konsentrasi aktivator KOH. Pembuatan elektroda karbon diawali dengan proses prakarbonisasi, penggilingan dengan ball milling dan diayak dengan ukuran partikel < 53 µm. Proses berikutnya dilakukan aktivasi kimia menggunakan aktivator KOH dengan variasi konsentrasi sebesar 0,3 M, 0,5 M dan 0,7 M. Pelet karbon dibuat dengan alat hydraulic press pada tekanan 8 ton. Proses karbonisasi dilakukan pada suhu 600°C pada lingkungan gas N2 dengan profil pemanasan bertingkat, dan diikuti dengan proses aktivasi fisika menggunakan gas CO2 pada suhu 850°C . Hasil penelitian ini diperoleh bahwa diameter, ketebalan dan massa setiap elektroda superkapasitor mengalami penurunan seiring dengan peningkatan konsentrasi KOH. Sedangkan densitas dan kapasitansi spesifik mengalami peningkatan dengan pertambahan konsentrasi KOH. Nilai kapasitansi spesifik tertinggi diperoleh sebesar 100,62 F/g dengan densitas 0,87 gr/cm3 pada variasi 0,7 M KOH. Kata-kata kunci: Analisa Dimensi, Kapasitansi Spesifik, Superkapasitor, Bunga Rumput Gajah, Variasi KOH Abstract Dimensions, density and specific capacitance of carbon electrode supercapacitor from flower of elephant grass by using various KOH concentrations has been analyzed. Production of carbon electrodes was performed by pre-carbonization, grinding by ball milling and sieving to a find a particle size of < 53 µm. The following process was an activation by chemical activation using KOH by various concentrations of 0.3 M, 0.5 M and 0.7 M. Carbon pellets were produced by hydraulic press instrument at a pressure of 8 tons. Carbonization process was carried out at a temperature of 600°C in a N2 gas environment with multilevel heating profile, and followed by physical activation process by throwing CO2 gas at a temperature of 850°C. The results of this study showed that the diameter, thickness and mass of each carbon electrode supercapacitor decrease with the increasing of KOH concentrations. While the density and specific capacitance were increased with the increasing of KOH concentrations. The highest specific capacitance value was obtained as high as 100.62 F/g with a density of 0.87 g/cm3 in the variation of 0.7 M KOH. Keywords: Dimensional Analysis, Specific Capacitance, Supercapacitors, Flower Elephant Grass, Variations KOH
EDDY CURRENT SENSOR BERBASIS FLAT COIL FR4 UNTUK MENENTUKAN KETEBALAN PELAT LOGAM NON MAGNETIK AL Tengku Emrinaldi; Salomo Salomo; Yanuar Hamzah; Iwantono Iwantono; Lazuardi Umar
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 3 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 3, Desember 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (391.066 KB) | DOI: 10.21009/SPEKTRA.023.07

Abstract

Abstrak Sensor arus eddy (eddy current) digunakan untuk pengukuran ketebalan logam khususnya logam non magnetik seperti alumunium. Penelitian ini telah mengembangkan sensor eddy current berbahan PCB (printed circuit board) jenis FR4 yang memiliki ketebalan lapisan tembaga 35micron. Prototipe yang dihasilkan mempergunakan koil sensor dengan jumlah gulungan (n) 30 lilitan, diameter (Æ) 30mm, lebar dan jarak antar koil, (dkoil) 0,254mm dan tahanan (Rkoil) sebesar 4,26Ω. Respon sensor ketebalan pelat logam terhadap bahan uji dievaluasi dengan memberikan eksitasi frekuensi tunggal 700Khz, 1MHz dan 1.33MHz. Rangkaian ketebalan pelat telah mempergunakan rangkaian pengunci fasa (phase locked loop) dan mampu mengukur variasi ketebalan mulai 0,2 mm sampai 2 mm, sementara jarak antara sensor dengan logam uji dijaga konstan 2 mm. Hasil pengukuran memberikan respon kurva U(t) dalam hubungan Kata-kata kunci:sensor eddy current, PCB FR4, material non magnetik, ketebalan logam, rangkaian phase locked loop Abstract Eddy current sensor is used to measure the thickness of metals, especially non-magnetic metals such as aluminum. This research has developed eddy current sensor made from PCB (printed circuit board) type FR4 which has 35micron copper layer thickness. The developed prototype uses a designed coil sensor with the number of winding (n) 30 turn, diameter () 30mm, width and distance between coils, (dkoil) 0.254 mm and coil resistance (Rkoil) of 4.26 Ω. The sensor response to the test material was evaluated by giving a single frequency excitation of 700 Khz, 1 MHz and 1.33 MHz. The plate thickness electronics has used a phase locked loop circuit and is capable to measure the thickness variations from 0.2 mm up to 2 mm, while the distance between the sensor coil and the test object was kept constant at 2 mm. The measurement results give the U (t) curve response in the exponential relationship. Keywords: eddy current sensor, PCB FR4, nonmagnetic material, thickness, phase locked loop circuit
The Oriented Attachment Model Applied on Crystal Growth of Hydrothermal Derived Magnetite Nanoparticles Ahmad Fadli; Amun Amri; Iwantono Iwantono; Arisman Adnan; Sunarno Sunarno; Sukoco Sukoco; Mayangsari Mayangsari
Indonesian Journal of Chemistry Vol 20, No 2 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.42917

Abstract

Magnetite (Fe3O4) nanoparticles are very promising to be applied as a drug delivery system (DDS) for cancer chemotherapy. In this research, the crystal growth of hydrothermal derived magnetite particles was studied by oriented attachment (OA) model. The OA model was used to investigate the mechanism and the statistical kinetic of crystal growth. The crystal diameter change as a function of time with different concentration was measured using XRD. Firstly, 0.3248 g FeCl3 and 1.1764 g of sodium citrate, as well as 0.3604 g urea were dissolved into 40 mL of distilled water in a reactor. Subsequently, the reactor temperature was maintained at 210 °C and reaction time of 3.5–12 h in an air oven. The morphology of obtained particles was characterized using TEM, whereas VSM was used to determine the magnetic hysteresis curve. The XRD pattern showed that magnetite was obtained at temperature 210 °C and 3.5 h reaction time, as well as its intensity increased with reaction time. The crystal size of Fe3O4 was 9.44 nm at 3.5 h and appropriate with the oriented attachment model. The magnetite nanoparticles with shaped core-shell size less than 50 nm and suitable for biomedical application especially as drug delivery.
Program Pendampingan Usaha Mikro Kecil dan Menengah dalam Menyediakan Baju Hazmat di Kota Pekanbaru Genny Gustina Sari; Iwantono Iwantono; Yohannes Firzal
PARAHITA : Jurnal Pengabdian kepada Masyarakat Vol 1, No 2 (2020): Jurnal Pengabdian kepada Masyarakat
Publisher : Indonesian Scientific Journal (Jurnal Ilmiah Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (584.241 KB) | DOI: 10.25008/parahita.v1i2.48

Abstract

Wabah Covid-19 yang melanda dunia telah membuat pola hidup berubah. Masyarakat dituntut menjaga jarak sosial, membatasi aktivitas di luar rumah dan menerapkan pola hidup bersih dan sehat. Sisi lain yang menarik untuk dilihat dari pandemi ini adalah tingginya jiwa sosial masyarakat, dibuktikan dengan membantu pihak yang terdampak covid baik kesehatan maupun ekonomi. Salah satu bentuk kepedulian masyarakat adalah membuat dan menyumbangkan masker dan baju hazmat bagi para tenaga medis. Universitas Riau melalui tim Pengabdian kepada Masyarakat (PKM) Covid mencoba memenuhi kebutuhan tersebut melalui pendampingan usaha mikro, kecil, dan menengah (UMKM) di Kota Pekanbaru. Sulitnya menemukan bahan baku pembuatan baju hazmat menyebabkan tim pengabdian harus membeli bahan baku dari luar Pulau Sumatra. Selain itu hanya ada dua UMKM yang bersedia menjahit baju hazmat. Total baju hazmat yang dibuat sebanyak 120 pieces dan telah didistribusikan ke tujuh lokasi di kota Pekanbaru dan sekitarnya.
Co-Authors A. A UMAR Ahmad Fadli Aisah, Nurul Akrajas Ali Umar Akrajas Ali Umar Amun Amri Arisman Adnan Awidrus Awidrus Awitdrus Awitdrus, Awitdrus Delovita Ginting, Delovita Desy Veyka Rukmana Dewi Mulfida Erin Mazelly Hutapea Erman Taer F. ANGELINA F. Y. NAUMAR Fera Anggelina Firzal, Yohannes Genny Gustina Sari H. Yusra Husna, Ropiqotul Jan Setiawan Lazuardi Lazuardi Lazuardi Umar Lutfi Rindang Lestari Mayangsari Mayangsari Mayta Novaliza Isda Morsin, Marlia Muhammad Pauji Mulfida, Dewi Nashiha Chalvi Syahra Nashiha Chalvis Syahra Neneng Fitrya P. NURRAHMAWATI Puji Nurrahmawati Putri, Elvina R. Taslim Rakhmawati Farma Rati Okta Della Rati, Yolanda Rika Taslim Rinaldo Abdi Rini, Ari Sulistyo Rita Meldayani Rizky Ardie Yani Romi Fadli Syahputra Saidatun Khofifah Saktioto Saktioto Salomo Salomo Saputrina, Truly Theresia Sella Natalia Simbolon, Norsinta Ida Solly Aryza Sri Novita Sukoco Sukoco Sumarti Sumarti Sunarno Suratun Nafisah Syajali, Hidayati Tengku Emrinaldi Teodora Maria Meliati Sinaga Viza Novia Putri Widarti &#039; Windayani Windayani Yana, Debi Yanuar Hamzah Yudani, Ananda Febri Yurike Asra Ziliwu, Friska Zulkarnain Zulkarnain