Oxygen shapes growth of graphene
Number of atoms on copper surface changes size and rate of material's crystal development
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/10/ticker_graphene860_free_0.jpg?fit=860%2C460&ssl=1)
Copper (orange) exposed to oxygen for 30 minutes sprouted centimeter-sized graphene crystals (pale).
Hao et al. Science 2013