Synthesis of 4H/fcc-Au@Metal Sulfide Core–Shell Nanoribbons

Abstract

Although great advances on the synthesis of Au-semiconductor heteronanostructures have been achieved, the crystal structure of Au components is limited to the common face-centered cubic (fcc) phase. Herein, we report the synthesis of 4H/fcc-Au@Ag2S core-shell nanoribbon (NRB) heterostructures from the 4H/fcc Au@Ag NRBs via the sulfurization of Ag. Remarkably, the obtained 4H/fcc-Au@Ag2S NRBs can be further converted to a novel class of 4H/fcc-Au@metal sulfide core-shell NRB heterostructures, referred to as 4H/fcc-Au@MS (M = Cd, Pb or Zn), through the cation exchange. We believe that these novel 4H/fcc-Au@metal sulfide NRB heteronanostructures may show some promising applications in catalysis, surface enhanced Raman scattering, solar cells, photothermal therapy, etc.

Electrochemical synthesis of Au@semiconductor core–shell nanocrystals guided by single particle plasmonic imaging

“…Interlayer spacings of 0.236 nm and 0.202 nm were observed in the core region, in good agreement with the d spacing of the (111) and (200) lattice planes of the fcc Au crystal. 39 In the shell region, interlayer spacings of 0.335 nm and 0.353 nm was obtained, complying with the lattice spacings of the (002) and (100) planes of the wurtzite (hexagonal) crystal CdS ( Fig. 4f and S6 †).…”

Thermal Effect and Rayleigh Instability of Ultrathin 4H Hexagonal Gold Nanoribbons

“…Recently, ultrathin Au nanoribbons (NRBs) with an unusual metastable hexagonal (4H) phase, 15 unlike normal Au with face-centered cubic (FCC) phase, [1][2][3][4] have been synthesized and possess promising plasmonic and catalytic applications such as electrocatalytic hydrogen evolution reaction. [16][17][18][19] Of note, 4H and FCC phases distinguish each other in terms of characteristic stacking sequences (i.e., ''ABCB'' for 4H and ''ABC'' for FCC) along their close-packed directions. However, their thermal stability at elevated temperatures, which should be of critical importance for their future practical applications, has not been well studied.…”

Atomic Arrangement Engineering of Metallic Nanocrystals for Energy-Conversion Electrocatalysis

“…These Au NCs with special stacking sequences can be employed as templates for the epitaxial growth of other metals and alloys with novel crystal phases including Pt, Pd, Ag, Ir, Rh, Os, Ru, Cu, 75,192,194 or even metal sulfides 191 (Figure 9F). Specifically, when using the 4H-fcc Au-Ag NRBs as seeds, the 4H-fcc trimetallic Au@PdAg core/shell NRBs can be obtained via galvanic reaction under ambient conditions.…”

“…Similarly, Ru NRBs with tunable length can also grow epitaxially on the 4H phase and fcc-twin boundary in 4H-fcc Au NWs because of the highly active 4H and fcc-twin structures of 4H-fcc Au NWs. Atomic resolution HAADF-STEM images depict the continuous lattice fringes across the interface between 191 Chen et al, 52 Fan et al, 192 Lu et al, 193 Fan et al 194 fcc Ru nanocages Yao et al, 53 Ye et al, 56 Zhao et al, 195 Zhao et al 196 4H-fcc Ru nanotubes Lu et al 197 Wet-chemical synthesis fcc Ru nanoparticles Zheng et al, 58 Kusada et al 198 AuRu 3 Lu et al 193 the Ru NRBs and the Au NW, indicating the epitaxial growth of Ru NRs on the Au NW (Figures 9G and 9H). The 4H crystal phases of Au and Ru are also identified by atomic resolution HAADF-STEM imaging, while the core/shell hybrid structure is displayed in the elemental map (Figure 9H, inset).…”