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

Abstract

Thermal responses in terms of geometry and crystalline phase evolution of ultrathin hexagonal gold nanoribbons (4H Au NRBs) were studied by in situ TEM. Under moderate electron beam-induced heating below 400 K, ''Rayleigh instability'' occurred with an obvious geometric effect, but the 4H phase remained stable. However, phase transition from 4H to face-centered cubic phase occurred when heating temperature approached 800 K by a dedicated MEMS chip, which agrees well with the molecular dynamics simulation results.

Stimuli-responsive surfaces for switchable wettability and adhesion

“…When the web was exposed to humid air, the retention force decreased dramatically from 2090 µN to 230 µN after being wetted, accelerating the water movement for collection. They explained this smart switch by a humidity induced Rayleigh instability break in the water film (figure 11i): the unique web which had three-dimensional multi-intersectional structure together with hydrophilic nanocone array decoration [146][147][148].…”

Roughening transition as a driving factor in the formation of self-ordered one-dimensional nanostructures

“…The mentioned property determines the strong dependence of the breakup characteristics into nanodroplets depending on the orientation of the axis of the nanowire relative to the crystal structure. In addition, the degree of manifestation of the roughening transition in one-dimensional nano-systems (not only in nanowires, but also in nanoribbons) can change during phase transitions associated with a change in the symmetry of its crystal structure due to external influences [49]. In particular, the effect of periodic modulation of nanoribbons (Au) is stimulated by their irradiation with an electron beam [49], and highly ordered Ag particle-chains have been obtained from Ag nanowires by radio frequency Ar + -plasma treatment [50].…”

Capturing the Equilibration Pathway of Nanomaterials Metastable in Both Crystal Structure and Morphology

“…In this issue of Matter, Zhang and co-workers address the aforementioned issue by leveraging the powerful in situ high-resolution transmission electron microscopy (HRTEM) to capture key morphological and structural transformations in ultrathin gold (Au) nanoribbons (NRBs) when they were subjected to thermal stress at different temperatures. 7 Figure 1A shows that the 4H and FCC phases feature stacking sequences of ''ABCB'' and ''ABC,'' respectively, along the close-packed direction. Initially, by elevating the temperature below 400 K under the irradiation of electron beam, they observed a significant change to the morphology or geometric shape of the Au NRB while the 4H crystal structure inside the nanoribbon remained stable (Figure 1B).…”

“…Altogether, considering the broader scope of application for binary alloys with different structures, the advanced characterization and computational methods demonstrated by Zhang and co-workers in this issue should find widespread use in the near future. Reprinted with permission from Li et al 7 Copyright, 2020 Cell Press Elsevier.…”

“…The Equilibration Pathway of the Ultrathin Au NRB (A) Crystallographic models of the 4H and FCC structures of Au. (B) Illustration of the morphological and then structural transformations of an ultrathin Au NRB when heated to different temperatures.Reprinted with permission from Li et al7 Copyright, 2020 Cell Press Elsevier.…”