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. 2018 Sep;51:774–785. doi: 10.1016/j.nanoen.2018.07.020

Fig. 3.

Fig. 3

SEM images of Cu2±xSe nano/microcrystals produced in water/ethylene glycol/PVP solvent at (a) 200, (b) 230, and (c) 260 °C reaction temperatures at low resolution (left column), higher resolution (middle column), and corresponding EDAX spectra (right column). Insets in the right column: circle selected on the micron-sized crystals for compositional (EDAX) investigations along with percentage atomic compositions of elements in the tabular form and corresponding copper to selenium (Cu/Se) ratios. The rest of the material is carbon from the conducting adhesive tape used for securing the sample.