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. 2014 Aug 8;4:5998. doi: 10.1038/srep05998

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(a) Typical diffuse reflectance spectra for CuSe nanosheets. (b) Plots of [F(R)hν]^1/2 and [F(R)hν]² vs energy for the CuSe nanosheets, from which indirect and direct band-gap energies are obtained.