Hollow Gold Nanospheres: Growth Morphology, Composition and Absorption Characteristics

Zhang, K.; Holloway, T.; Wingfield, A.; Pradhan, Jatindra Kumar; Cao, Wuyi; Pradhan, A. K.

doi:10.2174/1876402911103010076

Cited by 6 publications

(9 citation statements)

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“…To prepare Ag-Au core-shell NP supported on threedimensional NEMCF 400 , we immersed Ag@NEMCF 400 hybrids into aqueous solutions containing both K 2 CO 3 and HAuCl 4 (Kgold solution) for various periods, in which Au clusters or NP grew through GRR at the expense of Ag NP. [79][80][81][82][83][84][85][86] Aer GRR of these varied periods, NEMCF 400 hybrids with varied Au and Ag content are denoted as Ag-Au x @NEMCF 400 (in which x implies the duration of reaction, equal to 0.5, 1, 3, and 12 h). We Fig.…”

Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

“…The rst step grows hollow nanoshells comprised of Au/Ag alloys through the Kirkendall effect because Ag rapidly diffuses into Au. [79][80][81][82][83][84][85][86] The second step brings fragmentation of the hollow nanoshells through dealloying. Each step leads to distinct plasmon resonances, which correlate with structural and compositional evolution.…”

Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

“…Hollow nanostructures display a red-shied plasmon resonance in a NIR regime whereas the plasmon resonance is blue-shied at the stage of fragmentation of the hollow nanostructures into small pieces. [79][80][81][82][83][84][85][86] Goodman et al provided a clear interpretation of correlations between plasmon resonances and evolution of the structural composition during NP growth in a GRR; 79 they found also that the optical signature of an Ag/Au core-shell structure with pinholes within the Au shell was near that of neat Ag NP. According to their theoretical modeling calculated based on a nite-element method, 79 we ascribed the blue-shi plasmon resonance at 460.5 nm with depressed This journal is © The Royal Society of Chemistry 2015 intensity to the formation of Ag-Au core-shell NP with surface defects.…”

Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

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Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers

Liou

Lin

et al. 2015

RSC Adv.

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Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

Section: Structural Chemical Characterizations and Electrocatalytic A...mentioning

confidence: 99%

See 1 more Smart Citation

Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers

Liou

Lin

et al. 2015

RSC Adv.

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“…During the synthesis of hNPs, techniques such as calcination, , Kirkendall effect, , or laser ablations, , tend to produce channels and fractures on the hNP shell during the template removal. Therefore, once the hNP is synthesized, it is expected to have irregularities as polycrystalline domains or porous shells. ,,,− Notwithstanding, none of these factors have been discussed as a potential collapse mechanism.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Stability of Hollow Nanoparticles with Polycrystalline Shells

et al. 2020

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The existence of polycrystalline shells has been widely reported in the synthesis of hollow nanoparticles; however, the exact role displayed by the grain boundaries on the stability has been scarcely studied. By including them, in this work, we study for the first time the contribution of the polycrystalline structure in the stability of this unique kind of nanostructures, addressing at the same time, a more realistic modeling of hollow nanoparticles. The role of the polycrystalline structure was studied in gold hollow nanoparticles using molecular dynamics simulations for a wide range of shell thickness and grain sizes. One of the main findings is that the shell thickness necessary for transition from a spherical to a shrunk structure is related to the grain size reduction. The results suggest that to achieve larger hollow nanoparticles, less defective shells are necessary, with single-crystal shells establishing an upper limit in the size that a structure can attain. The cavity shrinkage in a polycrystalline HNP is due to a complex combination of grain diffusion, rotations, dislocation emission, and twining, all of them activated from the grain boundary regions. Our findings suggest that the polycrystalline structure is a crucial parameter to control and improve the stability of the hollow nanoparticles.

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“…In view of their unique optical properties, such HNPs have drawn the interest of many researchers. They are currently considered as ideal candidates for a wide range of biological and chemical applications, varying from catalysis to drug delivery, and from the treatment of cancer hyperthermia to surface-enhanced Raman spectroscopies 25 26 27 28 29 30 31 32 33 34 . However, the existing methods to synthesize them have remained limited to the fabrication of spherical HNPs.…”

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confidence: 99%

Ion-shaping of embedded gold hollow nanoshells into vertically aligned prolate morphologies

Pierre-Eugene

Amici

Clochard

et al. 2016

Sci Rep

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Ion beam shaping is a novel technique with which one can shape nano-structures that are embedded in a matrix, while simultaneously imposing their orientation in space. In this work, we demonstrate that the ion-shaping technique can be implemented successfully to engineer the morphology of hollow metallic spherical particles embedded within a silica matrix. The outer diameter of these particles ranges between 20 and 60 nm and their shell thickness between 3 and 14 nm. Samples have been irradiated with 74 MeV Kr ions at room temperature and for increasing fluences up to 3.8 × 1014 cm−2. In parallel, the experimental results have been theoretically simulated by using a three-dimensional code based on the thermal-spike model. These calculations show that the particles undergo a partial melting during the ion impact, and that the amount of molten phase is maximal when the impact is off-center, hitting only one hemisphere of the hollow nano-particle. We suggest a deformation scenario which differs from the one that is generally proposed for solid nano-particles. Finally, these functional materials can be seen as building blocks for the fabrication of nanodevices with really three-dimensional architecture.

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Hollow Gold Nanospheres: Growth Morphology, Composition and Absorption Characteristics

Cited by 6 publications

References 0 publications

Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers

Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers

Understanding the Stability of Hollow Nanoparticles with Polycrystalline Shells

Ion-shaping of embedded gold hollow nanoshells into vertically aligned prolate morphologies

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