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. 2013 Jun 18;3:2004. doi: 10.1038/srep02004

Figure 4. Cobaltocene doping of PbSe/CdSe NC solution and film samples.

Figure 4

(a) Schematic illustration of the effect of a CdSe shell on the stability of doping. (b) Absorption spectra of PbSe NCs before (solid black line) and after shell formation (dotted red line). (c) Absorption spectra of treated PbSe/CdSe NCs during a stability study. (d) Absorption spectra of PbSe/CdSe NC films exposed to cobaltocene solution. Solid black line: pristine film; dashed-dotted red line: 1 hour treatment; dotted blue line: 1 day treatment. Inset: Recovery of bleached absorption spectra of a treated PbSe/CdSe NC film following air exposure. The black and blue lines are from the main panel (same color spectra); the dashed green line corresponds to the sample treated for 1 day with cobaltocene and then exposed to air for 3 min. (e) Conductivity measurements of a pristine PbSe/CdSe NC film treated with EDT (f) The same measurements of NC film treated with cobaltocene. Insets are transmission electron microscopy (TEM) images of pristine (left) and EDT-treated (right) NCs (e), and cobaltocene-treated NCs (f).