FABRICATION OF CONDUCTIVE FILMS BASED ON REDUCED GRAPHENE OXIDE (RGO) USING ASCORBIC ACID AS REDUCING AGENT

• Main Author: DINA RAHMAWATI (NIM : 20216028)
• Format: Theses
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/26679
• Institution: Institut Teknologi Bandung

Transparent conducting film (TCF) is one of the important components in various optoelectronic and photovoltaic devices, such as smart windows or flexible LCD and OLED. Materials that are often used in the manufacture of TCF include Indium tin oxide (ITO) and Flourin Tin Oxide (FTO), because they have good transparency and conductivity. However, ITO and FTO have weakness including the relatively expensive price, limited chemical stability, long fabrication time, and very susceptible to electron leakage. Has high electronic and transparency properties. In this study, fabrication of graphene-based transparent films was carried out, with graphite oxide (GO) as the base material. Film deposition is carried out using drop casting method with L. Ascorbic Acid (LAA) and heat treatment, microwave and annealing process, as chemical and thermal reducing agents. Parameters used to increase sheet and transparency resistance values include variations in the dilution of GO: DI water 1x, 3x, 5x, 7x, variations in concentration GO: LAA 5:1, 3:1, 1:1,1:3, 1:5, Annealing variations of 100, 200, 300, 400 °C, and variations in microwave duration of 15, 30, and 60 minutes of high mode. The Scanning Electron Microscopy (SEM) characterization results showed homogeneous films obtained on films with dilution concentration GO:DI water 3x, and concentration GO:LAA 5:1. The results of sheet resistance and UV Vis points indicate that 300 °C annealing can improve the quality of RGO films with Rs 4.93 k?/sq and T 46.99%. While at 15 minutes microwave treatment produced Rs 4.54 k?/sq and T 38.28%. The best samples were obtained from microwave treatment for 30 minutes with Rs 4.21 k?/sq and T 43.73%. From the results obtained in this study, microwave treatment is a more effective and efficient method for the reduction of RGO film compared to annealing treatment. Fabrication of RGO thin films has been successfully carried out using environmentally friendly, non-toxic and low cost reducing. The use of drop casting method makes the process of fabricating RGO thin films easier.