Lattice Parameters of Fine Copper and Silver Particles

Onodera, S.

doi:10.1143/jpsj.61.2190

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…The shifting of diffraction peak to the smaller angle also suggests the expansion of the lattice parameter (interatomic distances) from the perfect single crystal lattice (for bulk Pt a 0 = 0.39231 nm) and also increase in the unit cell volume [44]. Lattice expansion with crystal size reduction has also been observed for Pd nanoparticles [45] and Ag nanoparticles [46]. A probable explanation for this effect might be the use of PVP as stabilizer, which has the ability to donate electron to the vacant d-orbital of metal atoms, hence leading to Pt-Pt bond expansion of the surface-near atoms by increasing electron density [2,22,47].…”

Section: Structural Characterizationmentioning

confidence: 79%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

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Section: Structural Characterizationmentioning

confidence: 79%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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“…One of the effects arising from the reduction of cluster size is the change of the lattice parameter [12][13][14][15][16][17][18][19][20][21]. In a number of cases, the direction of parameter changes differs for the particles of the same substance and depends on the conditions of their preparation.…”

Section: Computer Experimentsmentioning

confidence: 99%

“…In a number of cases, the direction of parameter changes differs for the particles of the same substance and depends on the conditions of their preparation. For example, the experimental data on reduction [10,16], increase [11,15,16], and absence of changes [18,19] …”

Section: Computer Experimentsmentioning

confidence: 99%

Study on the Structure and Morphology of Iron Nanopowders Obtained by the Method of Electric Explosion of Wires

Partizan¹,

Mansurov²,

Medyanova

et al. 2016

Eur Chem Tech J

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This article presents the results of comprehensive study on the structure and morphology of iron nanopowders synthesized by electric explosive evaporation of metal wire. The results of scanning and transmission electron microscopy showed that nanoclusters have a spherical shape with an average diameter of 65 nm. It was revealed based on the analysis of the diffraction patterns that nanoparticles of nanopowders obtained in electric explosion have a crystal lattice with a parameter less than a standard cell. The results of computer experiments are in good agreement with the findings of X-ray analysis. However, the question about the reasons of distortion of the crystal lattice of nanoclusters remains controversial.

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“…Figure 3.10b in the layers indicated by arrowheads. Surface stress due to the capillary effect may have significant influence on the lattice constant of nanocrystals [14,15]. Figure 3.11a gives a bright-field TEM image of a monolayer self-assembled Pt nanocrystals, most of which are single crystalline without twins or stacking faults.…”

Section: 2 Surface Reconstructionmentioning

confidence: 99%

“…15: HRTEM observations of dislocations at low-angle and highangle grain boundaries of Pt nanocrystals.…”

mentioning

confidence: 99%

Characterization of Nanophase Materials

Wang

2001

Part. Part. Syst. Charact.

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This contribution is a preprint of one chapter of Professor Wang's edited new book “Characterization of Nanophase Materials” (ISBN 3–527–29837–1), published by WILEY–VCH Verlag GmbH, Weinheim, Germany. Engineering of nanophase materials and devices is of vital interest in electronics, semiconductors and optics, catalysis, ceramics and magnetism. Development of nanotechnology involves several steps, of which characterization of nanoparticles is indespensable in understanding the behavior and properties of nanoparticles, aiming at implementing nanotechnology, controlling their behavior and designing new nanomaterials systems with super performance. The book focuses on structural and property characterization of nanocrystals and their assemblies, with an emphasis on basic physical approach, detailed techniques, data interpretation and applications. Intended as a comprehensive reference work for postgraduate students and researchers in the field who are specialized in materials chemistry, materials physics, and materials science.

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Lattice Parameters of Fine Copper and Silver Particles

Cited by 16 publications

References 5 publications

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Study on the Structure and Morphology of Iron Nanopowders Obtained by the Method of Electric Explosion of Wires

Characterization of Nanophase Materials

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