Figure 1: Controlling nanoscale surface wettability of Ag octahedra to assemble three superlattices. | Nature Communications

Figure 1: Controlling nanoscale surface wettability of Ag octahedra to assemble three superlattices.

From: Nanoscale surface chemistry directs the tunable assembly of silver octahedra into three two-dimensional plasmonic superlattices

Figure 1

(a) Schematic of interfacial self-assembly protocol at the oil/water interface. (b–d,f–h,j–l) SEM characterization and corresponding fast-Fourier transforms (FFTs) of the various Ag octahedra superlattices. (b) HCP monolayer of PVP octahedra is confirmed with FFT (c), adopting a planar configuration (d). (f,g) The planar OH superlattice is formed using C3-octahedra, with the octahedra aligned edge to edge (h). (j,k) A square superlattice with a pyramidal appearance is observed using C16-octahedra. The octahedra are aligned edge to edge. (l) Cross-sectional SEM shows only the vertices of Ag octahedra contacting the substrate. (b,f,j) Scale bars, 2μm; (b,f,j) inset scale bars, 200nm; (d,h,l) scale bar, 100nm. (e–m) Radial distribution functions of the three superlattices highlight excellent long-range order. The nearest neighbour distance increases from 188 nm (e) to 313 nm (i) and to 362 nm (m) for the HCP, OH and square superlattices, respectively.

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