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(A) Reaction scheme and a photograph of oleylamine-capped Cu2−xSe nanocrystals dispersed in chloroform; (B) TEM images of copper selenide nanocrystals. The high resolution TEM image in the inset of (B) shows the crystalline Cu2−xSe core of the nanocrystals. The average diameter of the nanocrystals is 16±1 nm.
