Figure 1.

Characterization of CuSe crystals. (a) Powder XRD pattern of the as‐prepared CuSe, which consists of a sharp diffraction pattern matching CuSe ICSD‐82331 (the crystal structure shown in the inset). (b) TEM images of the powder CuSe showing smaller crystals. (c) High‐resolution TEM image with atomic fringes matches with the (0 0 6) lattice plane of CuSe, and SAED pattern exhibiting diffraction rings of CuSe (inset). (d) SEM image of CuSe particle with (e, f) EDX mapping, which displays a homogeneous distribution of elements Cu (blue) and Se (orange).