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. 2016 Aug 26;6:32310. doi: 10.1038/srep32310

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UV-Vis adsorption spectra (a), plots of (αhν)^1/2 against the photon energy (hν) for indirect band gap deduction (b), plots of (αhν)² against the photon energy (hν) for direct band gap deduction and the direct band gap as a function of reaction time (inset) (c), UPS spectra in the high kinetic energy cutoff region and the work function as a function of reaction time (inset) (d) of GO and GNMs.