Figure 2From: A versatile chemical conversion synthesis of Cu2S nanotubes and the photovoltaic activities for dye-sensitized solar cellFE-SEM images and EDX spectra of Cu 2 S nanotubes with different reaction times. FE-SEM images of Cu2S nanotubes with different reaction times: (a) 10 min, (b) 20 min, (c) 40 min, and (d) 1 h. (a’-d’) The corresponding EDX spectra of Cu2S nanotubes with different reaction times.Back to article page