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. 2015 May 11;5:10142. doi: 10.1038/srep10142

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a) Dark-field image of the RdBS-functionalized 60 nm GNPs before addition of 1.0 μM NaF. b) The detail view of DFM image in (a). c) Calculated intensity of the RdBS-functionalized 60 nm GNPs before addition of 1.0 μM NaF. d) Dark-field image of the RdBS-functionalized 60 nm GNPs after the addition of 1.0 μM NaF. e) The detail view of DFM image in (d). f) Calculated intensity of the RdBS-functionalized 60 nm GNPs after the addition of 1.0 μM NaF.