유연모재 위에 전사된 CVD 그래핀의 전기-기계적 특성

Abstract

In this study, we observed the fracture mechanism ofsingle layer CVD graphene on PET substrate under tensile loading and proposed a crack parameter that is effectively capable of correlating the change of electrical resistance and strain. By using in-situ SEM observation, the crack development trend was analyzed through the average crack length and the number of cracks at each strain level. As a result, it was found that the crack development trend of graphene under tensile loading was categorized by three stages (no crack, crack length increase and the number of crack increase) and each stage influenced the slope of strain vs. R/R0 curve. Based on the findings that the average crack length has a linear relationship with the gauge factor of strain vs. R/R0 curve, the correlation equation was acquired. The predicted R/R0 values were in good agreement with the experimental R/R0 results in comparison to the crack density based predictions, which were commonly used in previous studies.