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. 2015 May 29;6:7338. doi: 10.1038/ncomms8338

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(a) Ultraviolet−vis absorption spectra of 1, TiO₂ and ZnO. The inset shows the Tauc plot for 1. (b) Room-temperature photoluminescence spectrum. (c) Temperature dependence of the a.c. conductivity of 1 at the frequency 500 Hz.