Investigation on the role of the molecular weight of polyvinyl pyrrolidone in the shape control of high-yield silver nanospheres and nanowires

Song, Yuanjun; Wang, Mingliang; Zhang, Xiaoyang; Wu, Jing-Yuan; Zhang, Tong

doi:10.1186/1556-276x-9-17

Cited by 142 publications

(87 citation statements)

References 35 publications

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“…We used a convenient and fast approach for synthesis of silver nanowires based on the work published by Song et al [12], and the preparation process is shown in Figure 1. In a synthesis process, 1 ml AgNO 3 solution (0.9 M in EG) and 0.6 ml NaCl solution (0.01 M in EG) were quickly put into 18.4 ml PVP solution (0.286 M in EG).…”

Section: Methodsmentioning

confidence: 99%

Enhanced Thermal Conductivity for Nanofluids Containing Silver Nanowires with Different Shapes

Zhang

Zhu

et al. 2017

Journal of Nanomaterials

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Nanofluids are the special agents to enhance the heat transfer property of the common fluids, and most of the thermal additives are the spherical nanoparticles. Up to now, the 1D thermal additives are not well exploited. In this paper, a kind of silver nanowires (AgNWs) with well-distributed shape and aspect ratio is synthesized. The results show that when we use the AgNWs prepared by the poly-vinyl-pyrrolidone (PVP) with a specific molecular weight of 40000, the thermal conductivity enhancement of nanofluids prepared by that kind of silver nanowires is as high as 13.42% when loading 0.46 vol.% AgNWs, and the value of the thermal conductivity is 0.2843 W/m⋅K, which is far more than the case when loading the same volume of spherical silver particles. Besides, we use H&C model to fit the experimental results and the experimental results are consistent with the model.

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Section: Methodsmentioning

confidence: 99%

Enhanced Thermal Conductivity for Nanofluids Containing Silver Nanowires with Different Shapes

Zhang

Zhu

et al. 2017

Journal of Nanomaterials

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“…Influence of PVP on the Yield and Dimensional Properties of Cu NWs. The molecular weight and concentration of PVP have been reported to control the yield and dimensions of NWs [36][37][38][39] due to their preferential adsorption on {100} planes of metallic surface compared to {111}. Thus, the effect of PVP concentration on the synthesis of Cu NWs at the reaction temperature of 182°C is investigated, while keeping Cl − /Cu 2+ molar ratio and the amount of N 2 purged constant.…”

Section: Influence Of Halide Ion Source and Its Concentration Onmentioning

confidence: 99%

“…In addition, PVP molecules are reported to enhance the reduction of metal salts by forming complexes through coordination between metallic ions and C=O groups and also stabilize the products subsequently [36,37]. However, the specific adsorption of PVP for the unidirectional growth of metallic seeds is only realized at specific Cl − ion concentrations [28,36,40]. At conditions suitable for the reduction of Ag ions to metallic Ag, Cl − ions control the morphology of Ag products through the etching processes that generate multitwinned Ag seeds.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Cu Nanowire Synthesis by PVP-Ethylene Glycol Route

Huaman

Urushizaki

Jeyadevan

2018

Journal of Nanomaterials

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Cu nanowire (NW) is a promising cost-benefit conducting material that could be considered for the development of transparent conducting films (TCF). However, the development of Cu NW as an alternating material for Ag or Au is not only limited by its stability in atmospheric conditions in the nanometer range but also due to the nonavailability of a simple synthetic route to produce them in high yields and in large-scale. Here, a scheme to synthesize Cu NWs by reducing Cu nitrate in a Cl − ionpolyvinylpyrrolidine-(PVP-) ethylene glycol (EG) system is proposed. Cu NWs with average diameter around 60 nm and average length of about 40 μm was obtained under optimized experimental conditions. Furthermore, the formation of Cu NW was elucidated to be through the progression of the following sequential reduction steps: at first, Cu ions underwent partial reduction to form spherical Cu 2 O. Then, the spherical Cu 2 O particles were redissolved and reduced to metallic Cu 0 atoms that subsequently formed the Cu seeds. Thereafter, Cu seeds underwent etching to form multiply-twinned particles (MTP). Finally, these Cu MTP grew unidirectionally to form metallic Cu NWs.

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“…Because of the high thermal and electrical conductivity of bulk silver, it is one of the most promising metal nanowire materials. [1][2][3][4][5][6][7][8] Silver nanowires hold promise as the conductive material in conductive inks suitable for screen printing. 8,[10][11][12][13][14][15] There are several methods to synthesize silver nanowires including the polyol process, hydrothermal synthesis, wet chemical process and irradiation photo reduction.…”

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confidence: 99%

Synthesis and Characterization of Silver Nanowire Suspensions for Printable Conductive Media

Hemmati¹,

Barkey²,

Gupta³

et al. 2015

ECS J. Solid State Sci. Technol.

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The purposes of this work are scaled-up synthesis of silver nanowires (AgNWs), assessment of their growth mechanism and measurement of the rheological properties of nanowire suspensions suitable for screen printing conductive circuits. A polyol synthesis process was used. The morphology and microstructure at various stages of the process were characterized by scanning electron microscopy (SEM). Aqueous silver nanowire inks with dispersant and binder were formulated. The rheological behavior of the inks was characterized by Stress Sweep Step (SSS), Steady State Flow Step (SSFS), Frequency Sweep Step (FSS) and Peak Hold Step (PHS) with a parallel plate rheometer. Rheological measurements under conditions that mimic the screen printing process have been done on the conductive inks through the PHS test to assess viscoelastic properties induced by flow alignment of the wires. Finally, the effect of silver nanowires on the rheological behavior of the ink has been compared with the effect of silver threedimensional (3D) nanoparticles (AgNPs). Since most of the available commercial silver inks suitable for screen printing process are non-aqueous solvent based, a contribution of this study is formulation of an environmentally benign water based nanowire ink. Metal one-dimensional (1D) nanostructures can play a valuable role in electronic devices, and have recently gained much attention due to their unique electrical, optical, and thermal properties. Because of the high thermal and electrical conductivity of bulk silver, it is one of the most promising metal nanowire materials.1-8 Silver nanowires hold promise as the conductive material in conductive inks suitable for screen printing. 8,[10][11][12][13][14][15] There are several methods to synthesize silver nanowires including the polyol process, hydrothermal synthesis, wet chemical process and irradiation photo reduction. Among these, the polyol process is simple and inexpensive, and provides a relatively high yield. 6 The polyol process proceeds by chemical reduction of silver ion in the presence of a polymeric surfactant. Poly(Vinyl Pyrrolidone) (PVP) acts to cap the (100) facet leading to uniaxial elongation of the initially formed silver seeds. In this process a trace amount of suitable salt can facilitate the growth of the initially formed silver seeds to the desired shape. The ethylene glycol functions as both solvent and reducing agent. [1][2][3] Various methods of printing have been used for the fabrication of printed circuits. Among these, screen printing is a rapid and inexpensive process.9 Thin printed circuits are applied in many technologies such as solar panels, flexible circuitries, and touch screens. [15][16][17][18][19][20][21][22] In screen printing, the ink is forced through a patterned screen onto a substrate. The printed pattern characteristics depend critically on the rheological properties of the ink.8 Strong shear thinning behavior permits charging of the ink at low shear onto the screen, followed by printing through the screen at high shear. Reco...

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Investigation on the role of the molecular weight of polyvinyl pyrrolidone in the shape control of high-yield silver nanospheres and nanowires

Cited by 142 publications

References 35 publications

Enhanced Thermal Conductivity for Nanofluids Containing Silver Nanowires with Different Shapes

Enhanced Thermal Conductivity for Nanofluids Containing Silver Nanowires with Different Shapes

Large-Scale Cu Nanowire Synthesis by PVP-Ethylene Glycol Route

Synthesis and Characterization of Silver Nanowire Suspensions for Printable Conductive Media

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