For example, CuxSey particles were also made in situ. Upon analysis of TEM and SAED data, it is clear that the product is polycrystalline, which we attribute to the many favorable forms taken by CuxSey. (Figure , Table ). In contrast, we can produce the single, low temperature phase of Ag2Se using this type of reaction, since only one phase is favored under ambient conditions (Figure , Table ). The formation of Ag2Se under these conditions is not surprising, since nanowires of this composition have been synthesized previously using the disproportionality of Se both as amorphous and trigonal forms.