Figure 4: Formation of Ag-rich or Au-rich AgmAun(SR)18 (m+n=25) clusters.
From: Structure-conserving spontaneous transformations between nanoparticles
Electrospray ionization mass spectra (ESI MS) spectra of a mixture of Ag25(DMBT)18 (I) and Au25(PET)18 (II) at molar ratios (I:II) of 6.6:1.0 (a–c) and 0.3:1.0 (d–f). DMBT is 2,4-dimethylbenzenethiol and PET is 2-phenylethanethiol. a–c and d–f correspond to the mass spectra measured within 2 min after mixing, after 10 min and after 1 h, respectively. The peak labels shown as numbers in red (m) and blue (n) in parentheses give the numbers of Ag and Au atoms, respectively, in the alloy clusters, AgmAun(SR)18. Insets a′ and e′ shows the Ag-rich clusters with n=1–3. Inset d′ shows the Au-rich clusters with n=22–24.
