Optical Characteristics of Multilayer Reduced Graphene Oxides Films Fabricated Using UV Oven Spraying Technique with Various Interval Irradiation Time

Abstract

Reduced graphene oxide (RGO) is promising candidate to be used as an active material of super capacitor electrodes. Graphene oxide (GO) is mostly used as a precursor, therefore it is needed to remove its oxygen containing functional groups. Generally, the RGO films are obtained from Graphene Oxide (GO) films which are then treated using thermal reduction or photo reduction process. We developed a spraying coating method that called as UV oven spraying by combining spraying coating method and photo reduction process. By this deposition method, we can obtain RGO films directly from the GO precursor since deposition and photo reduction steps are taken place at the same time. Level of oxygen removal of the obtained RGO film depends on irradiation intensity and length of irradiation. In this work, we report the effect of varied length of irradiation time on the RGO optical characteristics. We prepared multilayer of RGO films using UV oven spraying technique on quartz substrates from 0.5 mg/ml commercial GO dispersion (Graphenea) with varied the UV irradiation time. We used 125-Watt mercury lamp that was set at distance of 30 cm from substrates. We examined the effect of varied of length of irradiation time on its optical characteristics using UV-Vis Spectroscopy. Level of reduction by provided irradiation time was examined using SEM/EDS measurement.

Perbandingan Karakteristik Sel Superkapasitor Berbahan Komposit GO/TiO2 yang Dibuat Melalui Proses Termal Dengan dan Tanpa Autoclave

“…Sementara itu, titanium dioksida (TiO2) merupakan bahan oksida logam yang banyak dipelajari untuk pdseudo-superkapasitor karena memiliki keunggulan seperti biaya rendah, stabil secara kimia, bahan bakunya berlimpah, luas permukaan yang tinggi, namun memiliki kapasitas teoritis yang lebih rendah dan resistivitasnya yang tinggi [4,5] Oleh karena itu, penggunaan komposit rGO/TiO2 sebagai elektroda superkapasitor hibrida diharapkan dapat meningkatkan kinerja superkapsitor. Pada penelitian Xiang dkk, dilaporkan bahwa elektroda superkapasitor komposit rGO/TiO2 yang dibuat dengan teknik deposisi doctor blade memiliki kinerja yang baik dengan nilai kapasitansi spesifik 60 F/g, daya spesifik sebesar 90 W/kg dan energi spesifik sebesar 8 Wh/kg [2] Pada penelitian Khanifah dkk, telah berhasil dibuat lapisan rGO menggunakan teknik UV-oven spraying, dimana ketebalan lapisan dapat dikontrol melalui pengaturan dengan jumlah pengulangan lapisan [7]. Teknik ini juga dapat menghasilkan lapisan film rGO berkualitas baik langsung dari dispersi GO.…”