Underpotential deposition of lead on quasi-spherical and faceted gold nanoparticles

Deciphering the Surface Composition and the Internal Structure of Alloyed Silver–Gold Nanoparticles

“…In particular, lead (Pb) UPD gives information on the different crystal sites and the elemental distribution of silver and gold within nanoparticles . For Au nanoparticles (22 nm and 82 nm diameter, spherical), it was recently demonstrated that surface facets of nanoparticles can be identified by Pb UPD …”

“…[3l] For Au nanoparticles (22 nm and 82 nm diameter,s pherical), it was recently demonstrated that surfacef acets of nanoparticles can be identified by Pb UPD. [14] In the case of an alloy,U PD makes it possible to distinguish between ah omogeneous alloy and ac ore-shell system when combined with cyclic voltammetry.F urthermore, the average nanoparticle size can be computed. [13] This full characterization study of silver-gold nanoalloys of different molarc ompositions (Ag30Au70, Ag50Au50, and Ag70Au30) is complemented by the analysis of pure silver and gold nanoparticles.…”

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

“…These well‐defined particles showed an interesting Pb‐UPD behavior (Figure a, blue curve) with an additional spike of the (111) face labelled as 3a′ at −0.15 V. This spike is typical for a (111) surface with extended terraces just like a single‐crystal surface . Similar spike was also observed on polycrystalline gold electrodes and nanorods having (111) terraces and faceted gold nanoparticles . The peaks 2a and 2a′ also developed visibly.…”

3. Shape-controlled metal nanoparticles for electrocatalytic applications

“…Consequently, the Wulff analysis predicts a shape enclosed by a mixture of {111} and {100} facets. In fact, the most energetically stable shape would be a truncated octahedron with an optimal truncation fulfilling the condition 2 Brought to you by | University of Sussex Library Authenticated Download Date | 8/12/18 10:39 AM of γ(100)/γ(111) = d(100)/d (111), where d represents the distance of the facets from the centre of the particle [11]. In addition, kinetic factors also play a key role and, in general, the resulting shape will determine by the relative growth rates along the 〈100〉 and 〈111〉 directions.…”

“…The employ of some UPD processes to characterize the surface structure of different shaped metal nanoparticles is also a very interesting approach because these processes are very sensitive to the surface structure of the electrodes [107,108]. For instance, Pb UPD has been extensively used on different shaped Au nanoparticles [55,64,65,97,[109][110][111]. As shown in Figure 12, the Pb UPD displays distinctive features as a function of the surface structure of the shaped Au nanoparticles.…”