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. 2015 Nov 16;5:16628. doi: 10.1038/srep16628

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(a) UV/Vis absorption spectra of Pd_n (n = 4 ~ 20) clusters. (b) The UV/Vis absoption evolution of Pd_n (n = 4 ~ 20) clusters. (c) The first oxidation (reduction) potential evolution of Pd_n (n = 5 ~ 15) clusters. (d) The electrochemical and optic energy band gaps of Pd_n (n = 4 ~ 15) clusters.