Studi Difraksi Sinar-X Struktur Nano Seng Oksida (ZnO)

Abstract

Abstrak – Kajian terhadap difraksi sinar-X struktur nano ZnO dengan waktu sonikasi yang berbeda telah dilakukan menggunakan metode hidrotermal-sonokimia. Variasi waktu sonikasi yang digunakan dalam kajian ini adalah 0 (tanpa sonikasi), 30, 45, dan 60 menit. Pola difraksi sinar-X diplotkan dan dibandingkan untuk mengetahui struktur, kristalinitas dan kemurnian ZnO yang dihasilkan. Estimasi ukuran kristal ZnO juga dihitung menggunakan persamaan Scherrer. Hasil penelitian menunjukkan bahwa struktur nano ZnO yang disintesis tanpa proses sonikasi memiliki kemurnian kristal yang rendah dengan ukuran kristal yang sedang berkisar dari 22,36 – 32,90 nm. Proses sonikasi telah menyebabkan kristalinitas dan kemurnian ZnO meningkat jadi lebih baik. Namun, memperpanjang waktu sonikasi hingga 45 sampai 60 menit menyebabkan membesarnya ukuran kristal ZnO. Waktu sonikasi yang paling optimal adalah 30 menit dimana mampu menghasilkan ZnO dengan kristalinitas dan kemurnian yang baik dan rentang ukuran kristal ZnO yang lebih kecil antara 22,09 – 21,97 nm. Kata kunci: difraksi sinar-X, struktur nano, ZnO, sonikasi, Scherrer Abstract – Research on the X-ray diffraction study of ZnO nanotructure synthesized at different sonication times has been done using hydrothermal-sonochemical method. Sonication variation times that were used in this study were 0 (without sonication), 30, 45, and 60 minutes. The X-ray diffraction patterns were plotted and compared to understand the structure, crystallinity and purity of the resulted ZnO. The estimated crystallite size of ZnO nanostructure were also calculated using Scherrer equation. The results showed that the ZnO nanostructure synthesized without sonication process has a low crystal purity and a fair crystallite size in the range of 22.36 - 32.90 nm. Sonication process has led to a better crystallinity and purity of ZnO. However, longer sonication times up to 45 to 60 minutes has caused to the larger crystal size of ZnO. The most optimum sonication time was found to be 30 minutes which resulted in a good crstallinity and purity of ZnO and smaller crystallite size in the range of 22.09 – 31.97 nm.Key words: X-ray diffraction, nanostructures, ZnO, sonication, Scherrer

Low Temperature In Situ Synthesis of ZnO Nanoparticles from Electric Arc Furnace Dust (EAFD) Waste to Impart Antibacterial Properties on Natural Dye-Colored Batik Fabrics

“…To estimate the crystal size of the ZnO nanoparticles, the particles formed during the in situ synthesis were analyzed using X-ray diffraction (XRD) [ 28 , 29 ]. The average particle diameter was evaluated based on the data acquired from the XRD analysis using the Debye–Scherrer equation (Equation (1)) [ 30 ].…”

ANALYSIS OF CRYSTALLINE PHASE AND FUNCTIONAL GROUPS OF ZnO FROM PINEAPPLE PEEL EXTRACT

“…Zinc oxide (ZnO) is an inorganic semiconductor in the form of a powder that has a wide band gap compared to other metal oxides [1][2][3]. In addition, ZnO also has unique physical properties [4], capable of absorbing radiation [5], high catalyst activity, and non-toxic properties [5].…”

“…Hexagonal wurtzite is the most stable structure among the three structures compared to the cubic zincblende structure grown on substrates with a cubic lattice structure. Likewise, rock salt cubic structure is rarely observed [1]. ZnO could be obtained from plant extracts such as aloe vera leaf extract [9], rambutan peel extract [10], polygala tenuifolia root extract [11], rosa canina fruit extract [12], ginger rhizome extract [13], Garcia mangostana fruit extract [14] and pineapple peel extract [15,3,2].…”

“…Pineapple skin contains bioactive compounds such as saponins, flavonoids, tannins, anthocyanins [2], vitamin C, carotenoids, bromelain enzymes, water, crude fiber, reducing sugars, carbohydrate, es, and proteins [16]. Several methods of synthesizing ZnO such as aerosol-gel, hydrothermal [17], precipitation [18], solvothermal [14], thermal decomposition [14], sonochemistry [1] and green synthesis. The green synthesis method is easy to do because the method is environmentally friendly, natural materials are easy to obtain, and the process is simple and requires relatively low costs.…”

“…However, at an angle between 20-30°, a diffraction peak still appears even though the intensity is low and not identified. In their research, [1] showed that ZnO with a hexagonal wurtzite crystal structure was obtained by calcining at 60°C for 24 hours and centrifuging at 15000 rpm for 5 minutes. Likewise, in [2] study, ZnO was formed from a biosynthetic method with pineapple peel extract as a capping and reducing agent.…”