Basically, there are two methods of synthesis of nanocompounds: the “top down” method involving the decreasing size of “large-scale” substances, eg by grinding and the “bottom up” method, that combine the smallest “bricks” (atoms), with each other to obtain the desired size and shape of the molecule . We use the “bottom up” method because it gives us better control over the effect, although it requires more work and diligence from us.