Effects of chain length of polyvinylpyrrolidone for the synthesis of silver nanostructures by a microwave-polyol method

Tsuji, Masaharu; Nishizawa, Yuki; Matsumoto, Kisei; Kubokawa, Masatoshi; Miyamae, Nobuhiro; Tsuji, Takeshi

doi:10.1016/j.matlet.2005.10.027

Cited by 83 publications

(64 citation statements)

References 17 publications

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“…In the case of relatively low molecular weights (as in 10K PVP chains), spherical shapes can be readily substituted by planar hexagonal shapes. In this case, PVP preferentially adsorbs on {111} facets and growth occurs along {100} directions, in a similar way to the triangular crystals obtained by Tsuji et al 21 In addition, the Ag nanocrystals grown under the modified polyol method conditions are expected to have the lowest Gibbs free energies according to theoretical estimations for FCC single crystals, 23 leading to the hexagonal shapes shown in Figure 7(f).…”

Section: Morphology and Size Of Ag Nanoparticlessupporting

confidence: 73%

“…This is due to water absorption, which was not eliminated during drying as seen in Figure 10. When PVP is mixed with AgNO 3 , prior to dissolution in ethylene glycol, a shift in this frequency to 1642.09 cm 21 takes place, indicating a solid-state interaction between the AgNO 3 molecules with the PVP chains (see Fig. 11).…”

Section: Chemical Reactionsmentioning

confidence: 97%

“…The average lattice parameter calculated from a group of crystals shown in Figure 7 Tsuji et al 21 have shown that the shape of Ag nanocrystals, when obtained by polyol methods, greatly depends on the molecular weight of the PVP (and its different chain lengths). Accordingly, in 10K PVP (such as the one used in this work) the formation of Ag nanocrystals with leaves or plate-like shapes is highly favored, while the use of heavier PVP molecular weights (40-360K), promotes rod-like or wire-like shapes.…”

Section: Morphology and Size Of Ag Nanoparticlesmentioning

confidence: 99%

“…The FTIR infrared absorption spectrum of the PVP before any reaction shows a shift in the signal corresponding to C¼ ¼O of the amide group from a frequency of 1680.0 cm 21 to 1659.67 cm 21 . This is due to water absorption, which was not eliminated during drying as seen in Figure 10.…”

Section: Chemical Reactionsmentioning

confidence: 99%

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Synthesis of silver nanocrystals by a modified polyol method

Bregado-Gutiérrez¹,

Saldívar-García²,

López³

2007

J of Applied Polymer Sci

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A modification of the polyol method has been shown to result in improved efficiency and enhanced kinetics for the synthesis of silver nanocrystals when compared with the traditional polyol method. The Ag nanocrystals produced were characterized using Xray diffraction and transmission electron microscopy. Accordingly, the exhibited Ag crystal structure, corresponding lattice constants, and resultant particle sizes were determined by these means. In addition, using Fourier transform infrared spectroscopy, it was found that a solid-state reaction between the AgNO 3 and the Poly (vinylpyrrolidone) (PVP) takes place prior to their dissolution in ethylene glycol. Moreover, when crystals grow under total rest conditions, they do not develop a spherical morphology as in the traditional polyol method, but a well-defined geometric shape showing preferential crystallographic growth directions. Under the experimental conditions of this work, the exhibited nanocrystal shapes were quasi-planar hexagonal. Apparently, PVP interacts with the FCC crystal structure promoting growth on the {100} preferential direction by playing the role of an atomic arranger.

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Section: Morphology and Size Of Ag Nanoparticlessupporting

confidence: 73%

Section: Chemical Reactionsmentioning

confidence: 97%

Section: Morphology and Size Of Ag Nanoparticlesmentioning

confidence: 99%

Section: Chemical Reactionsmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of silver nanocrystals by a modified polyol method

Bregado-Gutiérrez¹,

Saldívar-García²,

López³

2007

J of Applied Polymer Sci

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“…A low concentrations of seeds and a high concentrations of PVP are favourable for the growth of cubic crystals and the polygonal nanoplates. On other hand, combination of a medium concentration of seeds with low concentrations of PVP are favourable for the growth of nanorods, nanowires and nanosheets [8,9].…”

Section: Growth Mechanisms Of Ag Nanostructuresmentioning

confidence: 99%

Synthesis of Nanowire-Shaped Silver by Polyol Process of Sodium Chloride

Nghĩa¹,

Trường²,

Thong³

et al. 2012

IJMC

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Nanowire-shaped silver have been synthesized by the polyol process in ethylene glycol as a reductant, polyvinylpyrrolidone (PVP) as a stabilizer, using a microwave technique. The products were characterized by transmission electron microscopy (TEM). The presence of sodium chloride in the polyol reduction of silver nitrate facilitated the production of silver nanowires. These wires were formed quickly (in approximately 3 minutes microwave heating). It was found that morphologies and sizes of silver nanostructures depended strongly on such experimental parameters as concentrations of PVP, NaCl, AgNO 3 , and heating time. The chloride ion was necessary to synthesize nanowire-shaped silver, and the sodium chloride likely controlled the rate of silver(I) reduction and initial seed formation.

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