Cellulose-based film extracted from spent coffee ground for substrate of electronics

Abstract

Cellulose-based green electronic is a promising and potentially game-changing technology due to the economics of manufacture, its ease of recycling/disposal and the applicability to flexible electronic. There has been extensive research to apply cellulose in substrate of electronic. This study explores the possibility of developing a stretchable cellulose-based thin film substrate using cellulose extracted from spent coffee ground (SCG). A thin film has been successful fabricated with a young modulus of 1.08 GPa and a maximum stretchability of 6.29% strain. To further tune the mechanical properties of the cellulose-based thin film, the application and effect of glycerol as a plasticizer have been studied. Various characterization techniques such as Fourier-transform infrared spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were conducted to confirm the identity of the film and mechanical properties of the film were investigated by tensile machine. Overall, cellulose-based thin film plasticized with glycerol recorded as maximum stretchability of 9.50% strain. The optimal percentage of glycerol in the film was 20% wt% as it has demonstrated better stretchability based of the results from the testing. However, the properties were not suitable for substrate of electronics, but the cellulose extracted from SCG can potentially be used as coating material in vitamin supplements.