Superfast assembly and synthesis of gold nanostructures using nanosecond low-temperature compression via magnetic pulsed power

Li, Binsong; Bian, Kaifu; Lane, J. Matthew D.; Salerno, K. Michael; Grest, Gary S.; Ao, T.; Hickman, R.J.; Wise, J.L.; Wang, Zhongwu; Fan, Hongyou

doi:10.1038/ncomms14778

Cited by 33 publications

(42 citation statements)

References 35 publications

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“…However, due to the isotropic nature of the spherical Au NPs, they possess random orientations (amorphous nature) in the superlattice films and final superstructures, as shown in Figure c, and Figures S10 and S11 in the Supporting Information. This phenomenon is similar to that observed in high pressure–induced sintering of Au NP arrays …”

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confidence: 86%

Directing Gold Nanoparticles into Free‐Standing Honeycomb‐Like Ordered Mesoporous Superstructures

Chen

Xie

et al. 2019

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www.small-journal.com 2D mesoporous materials fabricated via the assembly of nanoparticles (NPs) not only possess the unique properties of nanoscale building blocks but also manifest additional collective properties due to the interactions between NPs. In this work, reported is a facile and designable way to prepare free-standing 2D mesoporous gold (Au) superstructures with a honeycomblike configuration. During the fabrication process, Au NPs with an average diameter of 5.0 nm are assembled into a superlattice film on a diethylene glycol substrate. Then, a subsequent thermal treatment at 180 °C induces NP attachment, forming the honeycomb-like ordered mesoporous Au superstructures. Each individual NP connects with three neighboring NPs in the adjacent layer to form a tetrahedron-based framework. Mesopores confined in the superstructure have a uniform size of 3.5 nm and are arranged in an ordered hexagonal array. The metallic bonding between Au NPs increases the structural stability of architected superstructures, allowing them to be easily transferred to various substrates. In addition, electron energy-loss spectroscopy experiments and 3D finite-difference time-domain simulations reveal that electric field enhancement occurs at the confined mesopores when the superstructures are excited by light, showing their potential in nano-plasmonic applications.storage, biomedical sensing and so on. [1][2][3][4][5][6] Synthetic progress of many kinds of mesoporous materials has been achieved in the past decades, such as silica, carbon, titania, lead selenide, and metal-organic framework. [5,[7][8][9][10][11][12][13] Upon recent discovery of several metallic mesoporous structures with excellent optical and electronic properties, growing effort has been devoted to establish simple and efficient ways toward design and fabrication of metallic mesoporous materials. [14][15][16][17][18][19] Up to now, several template-based and dealloying approaches have been developed to produce metal-based mesoporous nanostructures, [2,15,17,[20][21][22][23] but some drawbacks are recognized which add limitations on the fabrication and application of metallic mesoporous materials. For example, the preparation processes are usually complex and involve harsh experimental conditions, and the harvested metallic mesoporous materials are often absent of size regularity and uniform distribution of mesopores. As a result, it is highly desired to develop a novel strategy capable of addressing such issues, enabling fabrication of highly uniform metallic mesoporous nanostructures. Nanoparticle (NP) assembly emerges as one promisingly designable way to organize monodisperse NPs into various Mesoporous nanomaterials possess a variety of distinctive geometric features, such as high surface area, large pore size, rigid structure, and 3D nanoscale framework. These unique properties allow the use of mesoporous materials for widespread applications, and examples include catalysis, energy Superstructures

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confidence: 86%

Directing Gold Nanoparticles into Free‐Standing Honeycomb‐Like Ordered Mesoporous Superstructures

Chen

Xie

et al. 2019

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“…XRD was collected while the nanocrystals were loaded up to 7.5 GPa and as pressure was released. The pressure was limited to 7.5 GPa to avoid sintering between the nanocrystals, which has been observed by our group and others at higher pressures (17)(18)(19). The XRD peak position and width (full width at half max) were observed to change with increasing and decreasing pressure and quantified at each pressure (Fig.…”

Section: Resultsmentioning

confidence: 82%

Nucleation of Dislocations in 3.9 nm Nanocrystals at High Pressure

et al. 2020

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As circuitry approaches single nanometer length scales, it is important to predict the stability of metals at these scales. The behavior of metals at larger scales can be predicted based on the behavior of dislocations, but it is unclear if dislocations can form and be sustained at single nanometer dimensions. Here, we report the formation of dislocations within individual 3.9 nm Au nanocrystals under nonhydrostatic pressure in a diamond anvil cell. We used a combination of x-2 ray diffraction, optical absorbance spectroscopy, and molecular dynamics simulation to characterize the defects that are formed, which were found to be surface-nucleated partial dislocations. These results indicate that dislocations are still active at single nanometer length scales and can lead to permanent plasticity. Main text:

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“…16). There have been some interesting studies that show new nanostructures, such as gold or CdSe nanowires can be synthesized by compression of their small nanoparticles [32][33][34] . In this work, we found that large area of compact and fused morphology changes appears in nanosheet assemblies upon mechanical compression.…”

Section: Resultsmentioning

confidence: 99%

Gold clay from self-assembly of 2D microscale nanosheets

Yue

Norikane

2020

Nat Commun

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Nature has always demonstrated incredible ability to create amazing materials such as soft clay which are built from nanoplatelet packing structures. It is challenging to produce artificial clays owing to the difficulty in obtaining large volume fractions of nanoplatelets and the lack of structural control in layer-by-layer packing. Here, single-crystalline Au nanosheets are synthesized by controlled growth in the bilayer membranes of succinic acid surfactants. Then, a self-assembly strategy is used to make {111}-oriented gold nanostructures at the liquid −liquid interface. The stiffness of the nanosheet assemblies are six orders of magnitude softer than bulk gold. The Au nanosheet aggregates show high plasticity and deformable into macroscale free-standing metallic architectures. They show a stress/strain-dependent conductivity owing to morphological changes. Our study provides valuable insights on the chemical synthesis of 2D nanostructures as well as for the self-assembly strategy on fabrication of mouldable metals for producing free-standing metallic architectures with microscale resolutions.

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Superfast assembly and synthesis of gold nanostructures using nanosecond low-temperature compression via magnetic pulsed power

Cited by 33 publications

References 35 publications

Directing Gold Nanoparticles into Free‐Standing Honeycomb‐Like Ordered Mesoporous Superstructures

Directing Gold Nanoparticles into Free‐Standing Honeycomb‐Like Ordered Mesoporous Superstructures

Nucleation of Dislocations in 3.9 nm Nanocrystals at High Pressure

Gold clay from self-assembly of 2D microscale nanosheets

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