Figure 4.

Optical absorption spectra of Sb2S3-TiO2 nanostructure samples. Before (green spectrum) and after being annealed at 100°C (red spectrum), 200°C (blue-green spectrum), 300°C (black spectrum), and 400°C (brown spectrum).

Li et al. Nanoscale Research Letters 2013 8:89   doi:10.1186/1556-276X-8-89
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