Direct Observation of Growth and Self‐assembly of Pt Nanoclusters in Water with the Aid of a Triblock Polymer Using <i>in situ</i> Liquid Cell Transmission Electron Microscopy (<scp>TEM</scp>)

Chen, Xin; Li, Chang; Kong, Xing; Cao, Hongliang; Wang, Hulian; Zhou, Xinzhu

doi:10.1002/cjoc.201700017

Cited by 6 publications

(2 citation statements)

References 46 publications

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“…In-situ liquid cell transmission electron microscopy (TEM) has high spatial and temporal resolutions in real time [14] and can directly observe the structural dynamic evolution of nanocrystals in the liquid environment, including the growth and etching of nanocrystals [15][16][17][18][19][20][21][22][23][24][25], which is a powerful technical tool to reveal the structural evolution mechanism of nanocrystals. At present, the in situ liquid cell TEM study on the anisotropic etching dissolution of noble metal nanorods mainly uses the high electron beam dose to irradiate the aqueous solution to form oxidizing groups to induce the etching of nanorods [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Real-time imaging reveal anisotropic dissolution behaviors of silver nanorods

Dong,

Pan,

Zhu

et al. 2024

Nanotechnology

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The morphology and size control of anisotropic nanocrystals are critical for tuning shape-dependent physicochemical properties. Although the anisotropic dissolution process is considered to be an effective means to precisely control the size and morphology of nanocrystals, the anisotropic dissolution mechanism remains poorly understood. Here, using in-situ liquid cell transmission electron microscopy (TEM), we investigate the anisotropic etching dissolution behaviors of polyvinylpyrrolidone (PVP)-stabilized Ag nanorods in NaCl solution. Results show that etching dissolution occurs only in the longitudinal direction of the nanorod at low chloride concentration (0.2mM), whereas at high chloride concentration (1 M), the lateral and longitudinal directions of the nanorods are dissolved. First-principles calculations demonstrate that PVP is selectively adsorbed on the {100} crystal plane of silver nanorods, making the tips of nanorods the only reaction sites in the anisotropic etching process. When the chemical potential difference of the Cl−concentration is higher than the diffusion barrier (0.196 eV) of Cl− in the PVP molecule, Cl− penetrates the PVP molecular layer of {100} facets on the side of the Ag nanorods. These findings provide an in-depth insight into the anisotropic etching mechanisms and lay foundations for the controlled preparation and rational design of nanostructures.

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Section: Introductionmentioning

confidence: 99%

Real-time imaging reveal anisotropic dissolution behaviors of silver nanorods

Dong,

Pan,

Zhu

et al. 2024

Nanotechnology

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“…The aforementioned divergence and complexity indicate that more comprehensive understanding should be taken into account when we refer to the formation mechanism of nanostructures of certain metals in liquid. Recently, in situ liquid cell transmission electron microscopy (TEM) with high spatial and temporal resolutions has emerged as an active domain of research that can provide direct visualization evidence of the synthesis of nanostructures in liquids. − The electron beam is used both for imaging and as means of reducing a precursor species in solution, which allows the nucleation and growth of a wide variety of metals and compounds to be followed in real time. Many recent studies have proved that nanocrystals synthesized in such a liquid cell resemble those from flask synthesis .…”

Section: Introductionmentioning

confidence: 99%

Understanding the Ensemble of Growth Behaviors of Sub-10-nm Silver Nanorods Using in Situ Liquid Cell Transmission Electron Microscopy

et al. 2019

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Desirable properties of nanomaterials in practical applications are directly associated with their specific size and morphology. Nanostructure growth behaviors in the synthesis process should be therefore studied for controlling and adjusting optimal configurations. In this work, the multistep liquid-phase growth mechanism of sub-10 nm silver nanorods in diameter is revealed using in situ liquid cell transmission electron microscopy. We observed that small-sized silver nanoparticles were first formed from precursor solution by monomer attachment. Then, larger nanoparticle building blocks were generated by nanoparticle attachment. Subsequently, shape-directed attachment growth of nanoparticle building blocks resulted in the formation of silver nanorods. During these processes, two approaching nanoparticles jumped to contact and coalesced into a dimer nanoparticle. When another particle approached the dimer nanoparticle, the nanoparticle chain would be formed by the end-to-end attachment. After the chain straightened, accompanied by mass redistribution and lattice rotation, single-crystalline silver nanorods dominated by {111} planes were finally produced. We attributed the jump-to-contact of individual nanoparticles and end-to-end attachment of nanorods in liquid to the formation of transient paired nanoparticle surfaces associated with the hydration layers and the weaker hydration force at the nanorod ends. Understanding these growth trajectories provide important fundamental insight connecting sub-10-nm crystal morphologies to the development of kinetically stabilized surface features.

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Facile Synthesis and in situ TEM Observation of Nanoporous Pd for Enhanced Catalytic Applications

Liu

Kaufmann

et al. 2019

Chin. J. Chem.

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of main observation and conclusion A facile, efficient and green photochemical synthetic approach has been used to prepare sponge-like porous Pd nanoparticles. Obtained by ultraviolet irradiation using a K 2 PdCl 4 precursor solution, the final products exhibited three dimensionally interconnected porous structures made up of ~3.6 nm sized Pd nanoparticles. In situ liquid cell TEM results indicated such porous structures are in a dynamic stable state when the particles are distributed in aqueous solution. The porous Pd nanoparticles exhibited electrochemical active surface area (ECSA) of up to 43 m 2 www.cjc.wiley-vch.de

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Direct Observation of Growth and Self‐assembly of Pt Nanoclusters in Water with the Aid of a Triblock Polymer Using in situ Liquid Cell Transmission Electron Microscopy (TEM)

Cited by 6 publications

References 46 publications

Real-time imaging reveal anisotropic dissolution behaviors of silver nanorods

Real-time imaging reveal anisotropic dissolution behaviors of silver nanorods

Understanding the Ensemble of Growth Behaviors of Sub-10-nm Silver Nanorods Using in Situ Liquid Cell Transmission Electron Microscopy

Facile Synthesis and in situ TEM Observation of Nanoporous Pd for Enhanced Catalytic Applications

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