Mismatch Strain versus Dangling Bonds: Formation of “Coin‐Roll Nanowires” by Stacking Nanosheets

Abstract

The third dimension comes to the rescue in the synthesis of laterally confined 2D crystals. Graphene‐type sheets of layered metal(IV) chalcogenides are stabilized by stacking to form nano‐objects that resemble a coin roll. Mismatch strain between NbS2 and WS2 lattices is important for the stabilization of the coin‐roll structure as well as for preventing the formation of the intrinsically more stable scroll structures such as fullerenes or nanotubes.

Low-temperature one-pot synthesis of WS2 nanoflakes as electrocatalyst for hydrogen evolution reaction

“…Therefore, the d-spacing of (002) planes is obtained on the edge of the NFs (figure 1(c)). According to previous reports, the 2D transition metal dichalcogenides are unstable and tend to form closed structures by rolling up [22][23][24]. Indeed a small amount of WS 2 NFs formed nanotubes by rolling up (figure S1 is available online at stacks.iop.org/NANO/30/ 045603/mmedia).…”

Self‐Optimization of the Active Site of Molybdenum Disulfide by an Irreversible Phase Transition during Photocatalytic Hydrogen Evolution

“…Thed iscrete and disordered growth of MoS 2 nanosheets prevented face-to-face restacking.T he freely suspended MoS 2 exhibited random elastic deformation and distortion edges,which favour the stability of 2D materials. [20] Tr ansmission electron microscope (TEM) images show that the MoS 2 nanosheets became noncontinuous after exfoliation (Figure 1c,d). In the X-ray diffraction (XRD) patterns,before exfoliation, MoS 2 exhibited an obvious (002) peak at 14.48 8, corresponding to an interlayer d-spacing of 0.614 nm, whereas after exfoliation, the (002) peak completely disappeared, indicating that the MoS 2 nanosheets were efficiently exfoliated into single-layered MoS 2 nanosheets ( Figure 1e).…”