Decahedral and icosahedral twin crystals of silver: Formation and morphology evolution

Li, C.R.; Lu, Nianduan; Xu, Qianfan; Mei, Jie; Dong, Wenjun; Fu, Jubo; Cao, Ziyang

doi:10.1016/j.jcrysgro.2011.01.068

Cited by 23 publications

(29 citation statements)

References 40 publications

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“…[14][15][16][17] That the core is Ag instead of the AgSi eutectic alloy can be verified from TEM, X-ray diffraction and energy-dispersive X-ray analysis results. 19,20 The size and shell thickness for such core/shell structures can be adjusted by changing the composition of the precursor and the evaporation conditions for the study of many interesting phenomena including the formation of stressed Fibonacci parastichous spirals. 14,16 In order to resolve the detailed mechanism for the Ag-catalyzed growth of SiO 2 nanowires, in the following we focus on the results obtained with the evaporation chamber pre-filled to 300 torr, thus the Ag droplets formed in vapor could be one micron in size (much larger than in the case shown in Fig.1).…”

Section: Resultsmentioning

confidence: 99%

Fast vapor phase growth of SiO2 nanowires via surface-flow on Ag core/SiO2 shell structure

Gao

et al. 2012

AIP Advances

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Uniform, millimeter-long SiO2 nanowires were grown from co-evaporation of Ag2O and SiO powders. The ‘frozen’ growth scenario by cooling enables revelation of the vapor-liquid-solid mechanism here in action, which is generally inaccessible due to the high temperature and high pressure condition. Ag core/SiO2 shell preformed in the vapor and wetting the substrate will expose its liquid Ag-core to catalyze nanowire growth, at a rate over 10 nm/s, via viscous flow of the encasing SiO2 layer which precipitates through a liquid neck zone. This method is characteristic of high-yield of catalytic seeds free from overgrowth or consuming, easy control of wire thickness by vapor pressure adjustment, enhanced rooting ability since catalyst deposition on substrate becomes dispensable, etc. Also spinning growth of nanowires observed in many other circumstances can be explained by the viscous flow mechanism.

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Section: Resultsmentioning

confidence: 99%

Fast vapor phase growth of SiO2 nanowires via surface-flow on Ag core/SiO2 shell structure

Gao

et al. 2012

AIP Advances

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“…For further growth of the decahedron crystallites, they must undergo a stress-relaxation process. Li et al [16] reported that stress-relaxation process proceeds via opening re-entrant grooves at the boundaries ( Figure 5(b)). The final irregular nanostructures is the consequence of the decahedrons growth comprising of some extra {100} and {111} facets.…”

Section: Effect Of Agitationmentioning

confidence: 99%

“…Moreover, an ideal archetype for investigating the growth mechanisms and twin crystals is silver due to its simple structure. [16] The growth mechanisms and the morphological features of silver nanocrystals have been studied by several researchers. It was reported that silver one-dimensional (1D) nanostructure consists of arranged subunits around a fivefold axis instead of a single crystal.…”

Section: Introductionmentioning

confidence: 99%

Interactive effect of agitation rate and oxidative etching on growth mechanisms of silver nanowires during polyol process

Amirjani

Haghshenas

Marashi

2015

Journal of Experimental Nanoscience

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In this work, the interaction between agitation rate and oxidative etching on the growth mechanisms of silver nanowires during polyol process, the most conventional applied method for metallic nanoparticles synthesis, is evaluated. It was found that the main reason for the formation of multidiameter nanowires (MDNWs) is the local accumulation of silver ions in the system, i.e. even at a low concentration of silver ions (94 mM) under the mild agitation conditions, MDNWs were producible. Moreover, it was inferred that the more stress (stemming from the high agitation) applied on the initially formed decahedron Ag particles affects the 're-entrant grooves opening' process which results in the formation and growth of irregular nanostructures. A polynomial equation for tuning aspect ratio of silver nanowires using different concentration of CuCl 2 solution was also proposed. Finally, based on the obtained experimental data together with the thermodynamic considerations, a growth mechanism was proposed which can promisingly be employed for describing the one-dimensional growth of silver nanowires in both surfactant-modified and surfactant-free procedures.

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“…Since the Cuboctahedral (CO) and Marks decahedral (MD) structures have been shown to be stable for Ag and Cu NPs [13,14], during our calculations 13-, 55-, and 147-atom CO structures and 13-, 49-, and 75-atom MD structures are considered (see Figure 1). The DFT calculations were carried out using DMol 3 code with the local-density approximation-Perdew-Wang-92 (LDA-PWC) and semi-core pseudopotential [15,16].…”

Section: Computational Detailsmentioning

confidence: 99%

Effect of atomic under-coordination on the properties of Ag and Cu nanoclusters

Ahmadi¹,

Zhang

Gong

et al. 2014

SPIE Proceedings

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Density functional theory calculations have been carried out to investigate the effect of the atomic under-coordination on the bond contraction, lattice strain, and electron configuration of Cuboctahedral and Marks decahedral structures of silver and copper nanoclusters. Our calculated results are consistent in trend with experimental measurements including extended X-ray-absorption fine structure (EXAFS), scanning tunneling microscope/spectroscopy (STM/S), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectra (UPS). This agreement approved the prognostications made on the bond-order-length-strength (BOLS) correlation and nonbonding electron polarization (NEP), suggesting that atomic under-coordination at the surface of nanoclusters cause bond contraction, which then leads to lattice strain, charge densification, core electron entrapment, as well as polarization of valence charge. The results of this work will contribute to the understanding of the intriguing properties of Ag and Cu nanoclusters.

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Decahedral and icosahedral twin crystals of silver: Formation and morphology evolution

Cited by 23 publications

References 40 publications

Fast vapor phase growth of SiO2 nanowires via surface-flow on Ag core/SiO2 shell structure

Fast vapor phase growth of SiO2 nanowires via surface-flow on Ag core/SiO2 shell structure

Interactive effect of agitation rate and oxidative etching on growth mechanisms of silver nanowires during polyol process

Effect of atomic under-coordination on the properties of Ag and Cu nanoclusters

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