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Abstrak -Oksida grafit (GO) telah berhasil disintesis menggunakan metode Hummers dari serbuk grafit dengan pelarut asam sulfat (H 2 SO 4 ), natrium nitrat (NaNO 3 ), kalium permanganat (KMnO 4 ), dan hidrogen peroksida (H 2 O 2 ). Hasil sintesis berupa pasta dicuci dengan asam klorida (HCl) dan akuades berulang-ulang untuk mendapatkan GO yang relatif murni. Pasta tersebut selanjutnya dikeringkan dan digerus untuk karakterisasi EDS (Energy Dispersive Spectroscopy), difraksi XRD (X-ray Difraction), dan spektroskopi FTIR (Fourier Transform Infrared). Untuk mengupas lembaran GO menjadi lapisan lebih tipis, pasta yang dihasilkan tersebut didispersikan dalam akuades, kemudian disonikasi serta disentrifugasi. Hasil yang didapat dikarakterisasi dengan menggunakan spektroskopi UV-Vis. Hasil karakterisasi sampel serbuk menunjukkan telah terjadi perubahan struktur grafit dengan terbentuknya gugus-gugus fungsional oksigen.Abstract -Graphyte oxide (GO)has successfully synthesized using Hummers method from graphite powder using, sulfuric acids (H 2 SO 4 ), sodium nitrate (NaNO 3 ), kalium permanganat (KMnO 4 ), and peroxide acids (H 2 O 2 ). The result seem as GO pasta then it was rinsed using chloric acids (HCl) and aquades for many times to get a pure GO pasta. Following this, the pasta was dried then grind to form pure GO powder for characterisation purpose using EDS (Energy Dispersive Spectroscopy), XRD diffraction (X-ray Difraction), and FTIR (Fourier Transform Infrared) spectroscopy. To exfoliate GO flakes to become more thinner as GO sheets, the pure GO pasta was dispersed in aquades follow by sonication and sentrifugation. The result was characterized using UV-Vis absorbance spectroscopy. The characterization results show that the structure of graphite power has been change to graphite oxide, indicated by forming the functional cluster of oxygen.

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