Hanoi Tower-like Multilayered Ultrathin Palladium Nanosheets

Abstract

This paper describes the synthesis, formation mechanism, and mechanical property of multilayered ultrathin Pd nanosheets. An anisotropic, Hanoi Tower-like assembly of Pd nanosheets was identified by transmission electron microscopy and atomic force microscopy (AFM). These nanosheets may contain ultrathin Pd layers, down to single unit cell thickness. Selected area electron diffraction and scanning transmission electron microscopy data show the interconnected atomically thick layers stacking vertically with rotational mismatches, resulting in unique diffractions and Moiré patterns. Density functional theory (DFT) calculation with van der Waals correction (DFT+vdW) shows the adsorption of Pd4(CO)4(OAc)4 on Pd(110) surface (Ead = -5.68 eV) is much stronger than that on Pd(100) (Ead = -4.72 eV) or on Pd(111) (Ead = -3.80 eV). The adsorption strength of this Pd complex is significantly stronger than that of CO on the same Pd surfaces. The DFT+vdW calculation results suggest a new mechanism for the observed anisotropic growth of nanosheets with unusually high aspect ratio, in which the competitive adsorptions between Pd4(CO)4(OAc)4 complex and CO on various surfaces result in a favored growth along the ⟨110⟩ directions and inhibition along ⟨111⟩ directions. The mechanical property of these multilayered Pd nanosheets was studied using AFM and nanoindentation techniques, which indicate multilayered nanosheets show more plastic deformation than the bulk in response to an applied force.

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Monolayer alkali and transition-metal monoxides: MgO, CaO, MnO, and NiO

“…2 There are a few studies aimed to synthesis ultra thin metallic materials. For instance Duan et al 4 reported fabrication of poly-supported single-layered rhodium nanosheets using a facile solvothermal method, and Yin et al 5 studied the synthesis, formation mechanism, and mechanical property of multilayered ultrathin palladium nanosheets.…”

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“…Biosynthesized metal nanoparticles have a combination of the two complementary properties: the inorganic properties like mechanical/thermal/structural stability and the properties of organic pendant moieties such as flexibility in solution (like homogeneous catalysts) and therefore, high reactivity of the catalyst . Cross‐coupling reactions have been used as powerful and useful synthetic tools in novel synthetic chemistry . The formation of C − S bonds is momentous in synthetic organic chemistry for the structure of different synthetics, a large number of drugs for diseases such as diabetes, cancer, Alzheimer's, Parkinson's, or inflammatory HIV diseases, and natural biologically active compounds (Figure ) …”

“…[40] Cross-coupling reactions have been used as powerful and useful synthetic tools in novel synthetic chemistry. [5,[41][42][43] The formation of C − S bonds is momentous in synthetic organic chemistry for the structure of different synthetics, a large number of drugs for diseases such as diabetes, cancer, Alzheimer's, Parkinson's, or inflammatory HIV diseases, and natural biologically active compounds ( Figure 1). [44][45][46] Recently, aryl sulfides and their derivatives have drawn much attention in molecular precursors for the development of this materials because of their biological, pharmaceutical properties.…”