Additional file 2.

Color change detected in ZnO irradiated areas. This file shows samples irradiated with different energies. As can be seen, a clear color change is observed in the irradiated area by the naked eye when illuminating under UV light. The irradiated areas appear black.

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Allah et al. Nanoscale Research Letters 2013 8:162   doi:10.1186/1556-276X-8-162