SINTESIS KOMPOSIT NANO GRAPHENE OXIDE (GO) / ZINC OXIDE (ZnO) MENGGUNAKAN METODE SONIKASI

NUR INDAH PUSPITA, . (2025) SINTESIS KOMPOSIT NANO GRAPHENE OXIDE (GO) / ZINC OXIDE (ZnO) MENGGUNAKAN METODE SONIKASI. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Nanokomposit GO-ZnO telah berhasil disintesis melalui metode sonikasi dengan dua variasi rasio komposisi, yaitu 50wt% dan 85wt%. ZnO diperoleh melalui teknik presipitasi menggunakan ekstrak daun kelor sebanyak 50 mL yang dicampurkan dengan prekursor Zn(NO₃)₂·4H₂O pada temperatur 80°C dan pH 10 selama 30 menit. Sementara itu, graphene oxide (GO) disintesis menggunakan metode Hummers melalui proses oksidasi grafit dengan campuran H₂SO₄, NaNO₃, dan KMnO₄ pada temperatur rendah (<20°C), kemudian dilanjutkan dengan pemanasan hingga 45°C selama 10 jam dan penambahan H₂O₂. Sintesis GO-ZnO dilakukan dengan melarutkan ZnO dan graphene oxide dalam pelarut air deionisasi dan etanol, kemudian disonikasi selama 2 jam dan dipanaskan dalam bak air panas pada temperatur 85°C sebelum dikeringkan pada temperatur 80°C untuk memperoleh serbuk GO-ZnO. Karakterisasi dilakukan menggunakan XRD, SEM, EDX, dan UV-Vis. Hasil XRD menunjukkan bahwa ukuran kristal meningkat pada sampel GO-ZnO, dengan nilai berturut-turut untuk ZnO, GO, GO-ZnO 85wt%, dan GO-ZnO 50wt% sebesar 28,13; 19,76; 34,60; dan 32,03 nm. Pengamatan SEM menunjukkan bahwa ZnO terdispersi merata di atas permukaan graphene oxide, dengan distribusi ukuran partikel graphene oxide, GO-ZnO 85wt%, dan GO-ZnO 50wt% masing-masing sebesar 27,70; 47,15; dan 41,50 nm. Analisis EDX mengkonfirmasi bahwa tidak terdapat elemen pengotor dalam sampel. Uji UV-Vis menunjukkan serapan khas graphene oxide pada 230–300 nm yang mengindikasikan keberadaan ikatan C=C dan C=O, serta peningkatan absorbansi dan penurunan band gap energi seiring bertambahnya rasio graphene oxide. Temuan ini menunjukkan bahwa rasio komposisi graphene oxide dalam nanokomposit GO-ZnO berpengaruh terhadap penurunan band gap dan peningkatan efisiensi penyerapan cahaya. Kata Kunci: Nanopartikel ZnO, Graphene Oxide (GO), Morfologi, Sonikasi, Struktur kristal, Ukuran Kristal, Distribusi Partikel, Sifat Optik. /*****NUR INDAH PUSPITA. Synthesis of Nano Graphene Oxide (GO) / ZINC OXIDE (ZnO) Composite Using Sonication Method. Under the guidance of IWAN SUGIHARTONO, HARIS SUHENDAR. GO-ZnO nanocomposites have been successfully synthesized through the sonication method with two variations of composition ratios, namely 50wt% and 85wt%. ZnO was obtained through a precipitation technique using 50 mL of moringa leaf extract mixed with the precursor Zn(NO₃)₂·4H₂O at a temperature of 80°C and pH 10 for 30 minutes. Meanwhile, graphene oxide (GO) was synthesized using the Hummers method through a graphite oxidation process with a mixture of H₂SO₄, NaNO₃, and KMnO₄ at a low temperature (<20°C), then continued with heating to 45°C for 10 hours and the addition of H₂O₂. Synthesis of GO-ZnO was carried out by dissolving ZnO and graphene oxide in deionized water and ethanol, then sonicated for 2 hours and heated in a water bath at 85°C before being dried at 80°C to obtain GO-ZnO powder. Characterization was carried out using XRD, SEM, EDX, and UV-Vis. XRD results showed that the crystallite size increased in the GO-ZnO sample, with values for ZnO, GO, GO-ZnO 85wt%, and GO-ZnO 50wt% of 28.13; 19.76; 34.60; and 32.03 nm, respectively. SEM observations showed that ZnO was evenly dispersed on the surface of graphene oxide, with particle size distributions of graphene oxide, GO-ZnO 85wt%, and GO-ZnO 50wt% of 27.70; 47.15; and 41.50 nm. EDX analysis confirmed that there were no impurity elements in the sample. UV-Vis test showed typical graphene oxide absorption at 230–300 nm indicating the presence of C=C and C=O bonds, as well as an increase in absorbance and a decrease in the energy band gap with increasing graphene oxide ratio. These findings indicate that the composition ratio of graphene oxide in GO-ZnO nanocomposites affects the decrease in the band gap and the increase in the efficiency of light absorption. Keywords: ZnO nanoparticles, Graphene Oxide (GO), Morphology, Sonication, Crystal structure, Crystal size, Particle distribution, Optical properties.

Item Type:	Thesis (Sarjana)
Additional Information:	1). Prof Dr. Iwan Sugihartono, M.Si 2). Haris Suhendar, M.Sc.
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Nur Indah Puspita .
Date Deposited:	22 Aug 2025 03:11
Last Modified:	22 Aug 2025 03:11
URI:	http://repository.unj.ac.id/id/eprint/61877

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