Read the following passage about the properties of graphene and answer the question that follows. Graphene, a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice, is lauded as a 'wonder material.' Its tensile strength is over 100 times greater than the strongest steel of the same thickness. As a conductor of electricity, it outperforms copper, and as a conductor of heat, it surpasses all other known materials. Furthermore, it is nearly transparent and remarkably lightweight. However, the mass production of high-quality, large-scale graphene sheets remains a significant and costly challenge, which currently limits its widespread commercial application. What is the primary purpose of this passage?