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In our paper [F.M. Li et al., 2008], two errors were noticed after the paper went to press. On page 3002, near the middle of the left column, it should say "In this method, zinc oxide and carbon powders are mixed together, usually in a ZnO:C ratio of 1: 1 or 1:4 by weight." In Fig. 8, on page 3005, the x-axis label should say "energy (eV)" instead of "wavelength (eV)." Also, this paper should have been designated as Invited, as it is now above.