Population statistics of gold nanoparticle morphologies: direct determination by HREM observations

Koga, Kenji; Sugawara, Ko‐ichi

doi:10.1016/s0039-6028(03)00300-5

Cited by 134 publications

(98 citation statements)

References 24 publications

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“…A summary of these formulas for icosahedral, cuboctahedral, and decahedral clusters for our purposes is given in Table 1. We note that gold nanoclusters have been formed in the icosahedral [5][6][7][8], cuboctahedral [9], decahedral [6,8,10], and cubic [5] forms. Also, platinum has been made in the icosahedral [2,11], cuboctahedral [12], decahedral [11], and cubic [12,13] shapes.…”

Section: Nanostructuresmentioning

confidence: 99%

Informational thermodynamic model for nanostructures

Kaatz

Bultheel

2014

J Math Chem

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Nanostructures may be fabricated from metal nanoclusters such as gold and platinum, which are of interest for catalytic and structural characteristics, or from nano forms of carbon allotropes. Here, informational thermodynamic properties such as entropy, enthalpy, and free energy are calculated using a graph network model at T = 298.15K. We calculate the partition function using Euclidean adjacency matrices from the Hamiltonian and estimated bond energies. The summed atomic displacement from the Kirchhoff index has power law behavior, while the thermodynamic properties exhibit logarithmic behavior with an increasing number of atoms, in agreement with previous models.

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Section: Nanostructuresmentioning

confidence: 99%

Informational thermodynamic model for nanostructures

Kaatz

Bultheel

2014

J Math Chem

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“…According to the Wolff's rule, the crystals try to assume a shape of least surface free energy at thermodynamic equilibrium. Therefore, formations of truncated octahedron, rhomb-dodecahedron, cubic, octahedron and octagon structures are thermodynamically favoured at nucleation stage and initial growth stage when the particle sizes are not very large [32][33][34]. EDX spectroscopy results confirmed the significant presence of metal silver.…”

Section: Resultsmentioning

confidence: 65%

Biogenic Synthesis of Antifungal Silver Nanoparticles Using Aqueous Stem Extract of Banana

Das¹,

Velusamy²

2013

Nano BioMed ENG

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The present study reports the synthesis of silver nanoparticles (AgNPs) from silver precursor using banana stem extract (BSE) as a plant biomaterial.Biologically synthesized AgNPs were observed at 425 nm with particle size ranges from 75.50 nm to 1.22 µm of truncated octahedron, rhombdodecahedron, cubic, octahedron and octagon structures. The presence of water-soluble organic compounds such as flavanones, polyphenols etc. in the BSE was identified by FTIR which were found to be responsible for the reduction of Ag + ions to AgNPs. The EDX analysis of the nanoparticles dispersion, using a range of 2-4 keV, confirmed the presence of elemental silver, with no other impurity peaks detected. In addition, the characterised AgNPs have the potential for various medical and industrial applications. The results showed that fungal susceptibility to AgNPs is different for each fungus.

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“…In this case, the instrument's information limit must resolve the main interplanar spacings of a material obtained along all the major, low-index zone axis orientations. The complex interrelationships between the HRTEM images and details of the NP orientation discussed in previous studies [27][28][29][30][31][32] were considered here.…”

Section: Methodsmentioning

confidence: 99%

Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles

et al. 2016

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a b s t r a c tHigh-resolution transmission electron microscopy (HRTEM) examination of nanoparticles requires their placement on some manner of support -either TEM grid membranes or part of the material itself, as in many heterogeneous catalyst systems -but a systematic quantification of the practical imaging limits of this approach has been lacking. Here we address this issue through a statistical evaluation of how nanoparticle size and substrate thickness affects the ability to resolve structural features of interest in HRTEM images of metallic nanoparticles on common support membranes. The visibility of lattice fringes from crystalline Au nanoparticles on amorphous carbon and silicon supports of varying thickness was investigated with both conventional and aberration-corrected TEM. Over the 1-4 nm nanoparticle size range examined, the probability of successfully resolving lattice fringes differed significantly as a function both of nanoparticle size and support thickness. Statistical analysis was used to formulate guidelines for the selection of supports and to quantify the impact a given support would have on HRTEM imaging of crystalline structure. For nanoparticles Z1 nm, aberration-correction was found to provide limited benefit for the purpose of visualizing lattice fringes; electron dose is more predictive of lattice fringe visibility than aberration correction. These results confirm that the ability to visualize lattice fringes is ultimately dependent on the signal-to-noise ratio of the HRTEM images, rather than the point-to-point resolving power of the microscope. This study provides a benchmark for HRTEM imaging of crystalline supported metal nanoparticles and is extensible to a wide variety of supports and nanostructures.

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Population statistics of gold nanoparticle morphologies: direct determination by HREM observations

Cited by 134 publications

References 24 publications

Informational thermodynamic model for nanostructures

Informational thermodynamic model for nanostructures

Biogenic Synthesis of Antifungal Silver Nanoparticles Using Aqueous Stem Extract of Banana

Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles

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