巯基保护的中空金纳米球

doi:10.3866/PKU.WHXB201711061

Abstract

Abstract:

We present the atomic structure of thiolate-protected hollow Au nanosphere (HAuNS), Au₆₀(SR)₂₀, with high symmetry and stability based on the grand unified model (GUM; Nat. Commun. 2016, 7, 13574) and density-functional theory (DFT) calculations. Using C₂₀ fullerene (with I_h symmetry) as a template, 20 tetrahedral Au₄ units were used to replace the C atoms of C₂₀, and three Au atoms of each Au₄ were fused with three neighboring Au₄ units by sharing one Au atom to form an icosahedral Au₅₀ fullerene cage as the inner core. Subsequently, the unfused Au atom in each Au₄ was bonded with the [―RS―Au―SR―] staple to form the completely hollow Au₆₀(SR)₂₀ nanosphere. Therefore, the Au₆₀(SR)₂₀ is composed of an icosahedral Au₅₀ fullerene hollow cage (constructed by fusing 20 tetrahedral Au₄ units) with 10 [―RS―Au―SR―] staples, obeying the "divide and protect" rule. Each Au₄ unit has 2e valence electrons, namely, the tetrahedral Au₄(2e) elementary block in the grand unified model. The DFT calculations showed that this hollow Au₆₀(SR)₂₀ nanosphere had a large HOMO–LUMO (HOMO: the highest occupied molecular orbital; LUMO: the lowest unoccupied molecular orbital) gap (1.3 eV) and a negative nucleus-independent chemical shift (NICS) value (−5) at the center of the hollow cage, indicating its high chemical stability. Furthermore, the NICS values in the center of the tetrahedral Au₄ units were much more negative than that in the center of the hollow cage, revealing that the overall stability of Au₆₀(SR)₂₀ likely stemmed from the local stability of each tetrahedral Au₄ unit. The harmonic vibrational frequencies were all positive, suggesting that the HAuNS corresponded to the local minimum of the potential energy surface. In addition, the bilayer HAuNS was designed by fusing the tetrahedral Au₄ layers, indicating the feasibility of tuning the thickness of the shell of HAuNS. In bilayer HAuNS, each tetrahedral Au₄ unit in the first layer shared four Au atoms, while those in the second layer shared one Au atom. The other three Au atoms of each tetrahedral unit bonded with the SR groups, demonstrating that each tetrahedral Au₄ unit has 2e valence electrons (namely the tetrahedral Au₄(2e) elementary block in GUM). The HOMO-LUMO gap of the bilayer Au₁₄₀(SH)₆₀ nanosphere is 1.5 eV, indicating its chemical stability. The thicknesses of the shells in monolayer and bilayer HAuNS are about 0.2 and 0.4 nm, respectively. This process could be easily understood in terms of the local stabilities of the tetrahedral Au₄(2e) elementary block in GUM. Finally, the design of larger HAuNS, Au₁₈₀(SR)₆₀, has also been presented. The HOMO-LUMO gap of Au₁₈₀(SH)₆₀ was 0.9 eV, which showed that it was also a stable HAuNS. This work provides a new strategy to controllably design the HAuNS.

Key words: Thiolate-protected hollow Au nanosphere, Density-functional theory, Grand unified model, "Divide and protect" rule, Nucleus-independent chemical shift

MSC2000:

O641

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Wenwu XU,Yi GAO. Thiolate-Protected Hollow Gold Nanospheres[J].Acta Phys. -Chim. Sin., 2018, 34(7): 770-775.

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Thiolate-Protected Hollow Gold Nanospheres

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