Preparasi Bionanokomposit Nanokristal Selulosa/Grafena Oksida sebagai Film Semikonduktor

Abstract

Cellulose nanocrystals (NKS) are a material that has high strength characteristics, is transparent, has good magnetic properties, and is biodegradable, which has the potential to replace silica and plastic materials as the main ingredients of semiconductor films. However, the low conductivity causes obstacles for NKS to become the replacement material. Therefore, the addition of graphene oxide (GO) to the NKS-based film is expected to increase its conductivity. This study aims to use the results of synthesis from coal as an additive to electrical conductivity in films based on NKS to form bionanocomposites and to see its potential as a semiconductor material. GO was synthesized from coal using the Hummers method, then prepared together with NKS to become a bionanocomposite film using the casting method with variations in GO concentrations of around 0, 1, 3, 5, and 7% w/b. GO is synthesized from coal whose structure is characterized using FTIR and X-ray diffraction. The GO has the functional group in general, namely the OH group, COOH, and C=O, and has a high crystalline phase. The resulting NKS/GO bionanocomposite film was characterized for its structure and morphology using FTIR and SEM, and electric current strength was measured using cyclic voltammetry and a four-point probe. After adding GO to the NKS-based film, the configuration did not undergo chemical changes but only changes in the glasses' interaction, and GO was also distributed evenly on the NKS-based film. In the electrical test, the NKS-based film with 7% GO content showed the ability to store electric charge with a value of 0.0327 F/g and had an electrical conductivity value of 0.06186 x 10-2 S/m.