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All Journal 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

Iwantono Iwantono

Jurusan Fisika, Universitas Riau, Simpang Baru, Pekanbaru, 28293

Author-ID : 2980200

Aerospace Engineering Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics

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PENGARUH PENAMBAHAN LOGAM TRANSISI NIKEL TERHADAP SIFAT FISIS NANOROD ZnO Sumarti Sumarti; Iwantono Iwantono; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 17, No 3 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.3.155-159

Nickel-doped ZnO nanostructures have been successfully grown using seed mediated hydrothermal method. The growth of ZnO nanostructures has been done by concentration of the Ni-doped solution, is 8 mM with the growth temperature of 90°C in 7 hours. The grown ZnO nanostructures were characterized by using UV-Vis Spectroscopy, FESEM, and XRD. The UV-Vis spectra of the samples showed that the ZnO nanorod is hexagonal in shape with a strong absorption occured in the wavelength range of 300-380 nm. The FESEM images showed that geometrical shape of Ni-doped ZnO nanostructures are nanorod with a hexagonal and nanoflower faced shapes. XRD patterns observed show five diffraction peaks at 2θ: 32,09°; 34,76°; 36,65°; 47,95° and 56,97° for Ni doped ZnO nanostructures with crystal orientation of (100), (002), (101), (102) and (110) respectively. The strongest line was found in the crystal plane of (101).

EFEK WAKTU RENDAM AKTIVASI KIMIA BERBANTUAN GELOMBANG MIKRO TERHADAP SIFAT FISIKA KARBON AKTIF DARI KULIT BUAH JENGKOL (PITHECELOBIUM JIRINGA) Yurike Asra; Iwantono Iwantono; Saktioto Saktioto; Rakhmawati Farma; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

Karbon aktif dari kulit jengkol dengan variasi waktu rendam aktivasi kimia menggunakan kalium hidroksida (KOH) yang dibantu dengan gelombang mikro telah berhasil dibuat, dengan rasio massa karbon terhadap KOH adalah 2:1. Waktu rendam aktivasi kimia divariasikan selama 24 jam, 36 jam, dan 48 jam. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh variasi waktu rendam terhadap sifat fisis karbon aktif kulit jengkol melalui struktur mikro, luas permukaan, daya serap, dan struktur rantai karbon. Struktur mikro karbon aktif menunjukkan bahwa karbon aktif memiliki struktur semikristalin dengan kehadiran 2 puncak pada sudut 2θ sebesar 22,994o dan 42,102o dengan orientasi bidang (002) dan (100). Tinggi lapisan (Lc) tertinggi dihasilkan pada sampel dengan waktu perendaman 24 jam yaitu 1,773 nm, dengan luas permukaan 124,50 m2 /g. Daya serap karbon aktif terhadap metilen biru sebesar 99,569 mg/g dan struktur rantai karbon dari kulit jengkol menunjukkan adanya gugus fungsi C-H, C-C, C=O, dan C-O pada bilangan gelombang 2943,43 cm-1, 2369,65 cm1 , 1612,56 cm-1 dan 1160,23 cm-1.

KARAKTERISASI SIFAT OPTIK DAN MORFOLOGI NANOROD ZnO YANG DIDOPING GALIUM (ZnO;Ga) Sri Novita; Iwantono Iwantono; Awidrus Awidrus
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

Telah dilakukan penumbuhan nanorod ZnO menggunakan metode hidrotermal pada suhu 90o C selama 8 jam di atas permukaan Flourine Tin Oxide(FTO). Pada penelitian ini akan dianalisa bagaimana efek dari variasi persentase doping galium 0,5%, 1%; 1,5%; 2%; 2,5%, 3% dan 3,5% terhadap sifat optik dan morfologi nanorod ZnO yang tumbuh. Sampel ZnO didoping galium dikarakterisasi dengan spektroskopi UV-Vis dan Mikroskop Pindaian Emisi Medan Elektron (FESEM). Spektrum UV-Vis menunjukkan bahwa nilai reflektansi yang kuat terjadi pada panjang gelombang 400-800 nm.Sampel doping Ga 2,5% menghasilkan reflektansi terendah dibanding sampel lain. Foto FESEM menunjukkan bahwa nanorod ZnO yang didoping galium tumbuh di atas permukaan FTO dengan penampang berbentuk heksagonal. Sampel 2,5% galium lebih seragam dan lebih tegak dibandingkan dengan sampel yang lain.

PENGARUH DAYA IRADIASI GELOMBANG MIKRO TERHADAP SIFAT-SIFAT FISIKA KARBON AKTIF KAYU EUCALYPTUS Widarti '; Awitdrus '; Rakhmawati Farma; Iwantono '
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Universitas Riau

Telah dilakukan penelitian yang bertujuan untuk mengetahui pengaruh daya iradiasi gelombang mikro terhadap sifat-sifat fisika karbon aktif kayu Eucalyptus. Karbon aktif dengan bahan pemula kayu Eucalyptus dikarbonisasi secara konvensional selama 1,5 jam dan aktivasi kimia dengan perbandingan massa karbon dan agen pengaktif KOH sebesar 2:1 dan diiradiasi dengan menggunakan gelombang mikro selama 20 menit dengan variasi daya antara 540; 630 dan 720 Watt. Aktivasi kimia dan iradiasi gelombang mikro berpengaruh terhadap sifat-sifat karbon aktif. Hasil karbon aktif setelah diiradiasimenggunakan gelombang mikro menunjukkan bahwa semakin tinggi daya iradiasi maka semakin kecil karbon aktif yang dihasilkan. Karbon aktif yang diiradiasi menggunakan daya 630 Watt menghasilkan persentase degradasi paling tinggi sebesar 96,859%, nilai ini didukung oleh nilai Lcyang tertinggi sebesar 48.4733Å.

PENGARUH WAKTU PERENDAMAN DALAM PEMBUATAN KARBON AKTIF CANGKANG BUAH KETAPANG DENGAN PENGAKTIFAN KIMIA BERBANTUAN IRADIASI GELOMBANG MIKRO Awitdrus '; Desy Veyka Rukmana; Rakhmawati Farma; Iwantono '
Komunikasi Fisika Indonesia Vol 13, No 13 (2016)
Publisher : Universitas Riau

Karbon aktif dibuat dari cangkang Terminalia cattapa. Cangkang Terminalia cattapa dikarbonisasi biasa selama 3 jam. Rasio persentase massa granul karbon : KOH adalah 2: 1. Campuran butiran karbon dan KOH direndam dalam 200 mL air suling selama 12 jam, 24 jam dan 36 jam. Masingmasing selanjutnya diiradiasi dengan daya 630 watt untuk 20 menit. Sampel dikarakterisasi dengan mikroskop pindaian elektron, EDX dan luas permukaan. Kandungan karbon dan luas permukaan karbon aktif masing-masing berada dalam interval 66,93 % - 69,26 % dan 285,85 m2 /g - 293,36 m2 /g.

ANALISA SIFAT FISIS NANOPARTIKEL ZnO DI-DOPING Ag YANG DISINTESIS MENGGUNAKAN METODE BIOSINTESIS Rita Meldayani; Iwantono Iwantono; Ari Sulistyo Rini; Yolanda Rati
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.7-10

Nanotechnology is developing rapidly with a variety of synthetic materials, apart from the perceived work efficiency, which is also prioritized in terms of safety and non-toxicity. The synthesis that has the potential to be carried out based on these criteria is the type of Ag-doped ZnO nanoparticles. ZnO nanoparticles were prepared by a biosynthetic method using pineapple peel extract as a reducing agent. This study aims to look at the effect of adding Ag to ZnO nanoparticles. The percentage variation of Ag to ZnO is 1%, 3%, and 5%. The pineapple peel extract was mixed with 0.05 M (Zn(NO3)2)·6H2O and 0.05 M AgNO3 precursor solutions. The solution was heated at 80 °C for 2 hours. The results of the biosynthesis were characterized using Spectroscopy UV-Vis, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The UV-Vis spectrum informs that strong absorption occurs at wavelengths below 400 nm. The maximum absorption is shown by sample ZnO:Ag 3% and the minimum absorption is shown by the pure ZnO sample. XRD characterization showed that the formation of seven diffraction peaks occurs at a diffraction angle (2θ) of: 31.729°; 34,397°; 36,214°; 47,467°; 56,541°; 62.831°; and 67.922°. The SEM results showed surface morphology of ZnO and ZnO:Ag 1% samples are floral and spherical, while ZnO:Ag 3% and ZnO:Ag 5% samples are coral rocks.

PENGARUH PENAMBAHAN PERAK PADA MOLEKUL DYE TERHADAP EFISIENSI DYE SENSITIZED SOLAR CELL Rati Okta Della; Iwantono Iwantono
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.64-68

Dye sensitized solar cell (DSSC) is made with a layer arrangement of fluorine tin oxide (FTO), zinc oxide (ZnO), dye, electrolyte, and plastisol. ZnO nanorods which play a role as photoanode in DSSC have been successfully grown on FTO substrate using seed mediated hydrothermal method at temperature of 90 ºC for 8 hours. Modification was made to increases the efficiency of DSSC by adding silver (Ag) with concentration of 5 mM into dye molecules. ZnO characterization was performed using ultra violet-vissible (UV-Vis) spectroscopy and field emission scanning electron microscopy (FESEM). The strongest UV-Vis absorbance spectrum with the optimum absorbance for the ZnO sampel was occurred at the wavelength range of 300 – 360 nm. Meanwhile, for the ZnO sample with addition of 5 mM Ag into dye molecule was occurred at the wavelength range of 440 – 530 nm. FESEM image of the sample shows the as-synthesized ZnO nanorods have hexagonal cross section. I-V characteristics in the light mode was carried out to determine the efficiency of DSSC using a halogen lamp with an intensity of 100 mW/cm2. The efficiency of DSSC using ZnO with addition of 5 mM Ag into dye molecule is 0.462%, increases compared to the efficiency of DSSC using ZnO without addition of Ag into dye molecule which only produce 0.45% efficiency. These results indicate that the addition of Ag can increase the efficiency of DSSC.

PEMBUATAN DAN KARAKTERISASI KARBON AKTIF DARI BAMBU BETUNG (DENDROCALAMUS ASPER) DENGAN AKTIVASI KOH BERBANTUAN GELOMBANG MIKRO Erin Mazelly Hutapea; Iwantono Iwantono; Rakhmawati Farma; Saktioto Saktioto; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

Telah berhasil dibuat karbon aktif dari bahan bambu betung (Dendrocalamus Asper)melalui proses pra-karbonisasi selama 1 jam dengan aktivasi kimia menggunakan KOH dengan perbandingan variasi massa karbon aktif dengan massa aktivator 1:0, 1:1, 1:2 dan 2:1. Pengaktifan dibantu iradiasi gelombang dengan daya mikro (µ) 630 Watt selama 20 menit. Penelitian bertujuan untuk mengkarakterisasi karbon aktif menggunakan difraksi sinar-X, spektroskopi inframerah transformasi fourier (FTIR) dan dayaserapmetilenbiru. Karakterisasi difraksi sinar-X menunjukkan karbon aktif memiliki pola difraksi semikristalin dengan kehadiran puncak pada sudut 2θ sebesar 21,268o dan 41,014o masing-masing bersesuaian dengan orientasi (002) dan (100). Tinggilapisan (Lc) tertinggi dihasilkan pada rasio 1:1 sebesar 21,495 nm dan data ini didukung oleh daya serap karbon aktif terbaik terhadap metilen biru yaitu pada rasio 1:1 sebesar 99,327 mg/g. Hasil karakterisasai FTIR menunjukkan karbon aktif memiliki serapan gugus –OH, C-H dan C=C. Secara keseluruhan hasil perhitungan dan analisis yang diperoleh menunjukkan bahwa banyaknya KOH mempengaruhi kualitas dari karbonaktif yang dihasilkan.

EFEK PENAMBAHAN ATOM TEMBAGA (Cu) DAN PERAK (Ag) PADA MATERIAL AKTIF NANOMATERIAL ZnO SEL SURYA FOTOELEKTROKIMIA Windayani Windayani; Iwantono Iwantono; Awitdrus Awitdrus; Zulkarnain Zulkarnain
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

ZnO material coated with Cu + Ag was successfully grown using seed mediated hydrothermal method at a temperature of 90° C for 8 hours with a variation of concentration of Ag, 10 mM, and 20 mM. The growth of ZnO nanomaterials was carried out on the FTO substrate (Flourine Tin Oxide). The Samples were characterized using, Field Emission Scanning Microscope (FESEM), and X-ray Diffraction (XRD). The FESEM photos show ZnOnanorod coated with Cu + Ag have grown on FTO having a nanoflower shape that consructed from ZnOnanorods with their orientation . The XRD pattern shows five peaks at 2θ: 31.69 °; 34.36 °; 36,18 °; 47.52 °; and 56.4 °. Based on the results of the analysis of the OriginPro 8 program each peak in a row according to the crystal orientation (100), (002), (101), (012), and (110). The stongest line was found in the crystal plane (101). DSSC was fabricated using ZnO nanomaterial coated with Cu + Ag as active material, N719 dye, liquid electrolyte, and plastisol as catalyst on the counter electrode. The results of I-V measurements at halogen lamp with ilumination its intensity of 100 mW/cm2 of the cells has producedthe highest efficiency value based on Cu coated ZnO was based DSSC 0,98% with a Cu concentration of20mM.These results show that the addition of Cu layer can increase the efficiency of DSSC based on ZnO by 123% compared to ZnO without Cu based DSSC. Addition of Ag to active material of Cu coated ZnO nanomaterial did not have a positive effect on the efficiency of DSSC cells.

MORFOLOGI DAN EFISIENSI SEL SURYA FOTOELEKTROKIMIA BERBASIS NANOSTRUKTUR ZnO DILAPISI TEMBAGA Iwantono Iwantono; Sella Natalia; Rinaldo Abdi; Awitdrus Awitdrus; Zulkarnain Zulkarnain
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

ZnO nanostructures coated Cu (Copper) have been successfully grown using a method of seed mediated hydrotermal. The growth of Cu coated ZnO nanostructures were used as an active material of DSSC. The Cu on ZnO nanostructures has been coated at a concentration of 10 mM at room temperature in 30 minutes. The samples were characterized using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray (EDX). The FESEM images showed that the geometrical shape of ZnO nanostructures was nanoflower. Spectra of EDX showed Cu was really exist in all samplesof about 0.8%. A DSSC was fabricated by using the ZnO nanostructured coated Cu as an active material.The results of I-V measurements under iluminattion of halogen lamp its intensity of 100 mW/cm2 has produced efficiency 0.35% (DSSC without copper) and increasedto 0,43% whenCuwas coated on ZnO.

Co-Authors Ahmad Fadli Akrajas Ali Umar Amun Amri Arisman Adnan Awidrus Awidrus Awitdrus Awitdrus, Awitdrus Desy Veyka Rukmana Dewi Mulfida E. Taer Erin Mazelly Hutapea Erman Taer Fera Anggelina Firzal, Yohannes Genny Gustina Sari H. Yusra Lazuardi Umar Lazuardi Umar Lutfi Rindang Lestari Mayangsari Mayangsari Muhammad Pauji Nashiha Chalvi Syahra Nashiha Chalvis Syahra Puji Nurrahmawati R. Taslim Rakhmawati Farma Rati Okta Della Rika Taslim Rinaldo Abdi Rini, Ari Sulistyo Rita Meldayani Rizky Ardie Yani Saidatun Khofifah Saktioto Saktioto Salomo Salomo Sella Natalia Sri Novita Sukoco Sukoco Sumarti Sumarti Sunaro Sunarno Tengku Emrinaldi Viza Novia Putri Widarti ' Windayani Windayani Yanuar Hamzah Yohannes Firzal Yolanda Rati Yurike Asra Zulkarnain Zulkarnain

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