“…The formation of simple binary nanoparticles such as SiO 2 , Al 2 O 3 , and Fe 3 O 4 has essentially become a routine process, as many groups have developed numerous approaches for their synthesis. − This is not to say that for each system different synthetic variables do not still have to be optimized, but in general it is understood how one can obtain simple systems, such as CdTe, on the nanoscale with a desired nanoparticle size. , The situation becomes more complicated if one targets the synthesis of ternary nanoparticles; however, even here, many examples exist in the literature where in a single step ternary nanoparticles can be synthesized and their size controlled. , The synthesis of crystallographically ordered quaternary nanoparticles, however, remains a significant challenge due to the difficultly of combining multiple elements, achieving chemical reactivity between the elements, and still maintaining a product particle size at the nanoscale.…”