scholarly journals Polyol Silver Nanowire Synthesis and the Outlook for a Green Process

2020 ◽  
Vol 2020 ◽  
pp. 1-25 ◽  
Author(s):  
Shohreh Hemmati ◽  
Michael T. Harris ◽  
Dale P. Barkey
Keyword(s):  
Silver Nanowires ◽  
Synthesis Method ◽  
Polyol Process ◽  
Silver Nanowire ◽  
Polyol Synthesis ◽  
High Yield ◽  
Silver Nanostructures ◽  
Wearable Electronics ◽  
Aspect Ratios ◽  
Size And Morphology

Silver nanowires (AgNWs) have a broad range of applications including nanoelectronics, energy conversion, health care, solar cells, touch screens, sensors and biosensors, wearable electronics, and drug delivery systems. As their characteristics depend strongly on their size and morphology, it is essential to find the optimal and most cost-effective synthesis method with precise control over the size and morphology of the wires. Various methods for AgNW synthesis have been reported along with process optimization and novel techniques to increase the yield and aspect ratios of synthesized AgNWs. The most promising processes for synthesis of AgNWs are wet chemical techniques, in which the polyol process is low cost and simple and provides high yield compared to other chemical methods. Reaction mechanism is one of the most important factors in strategies to control the process. Our purpose here is to provide an overview on the main findings regarding synthesis, preparation, and characterization of AgNWs. Recent efforts in the polyol synthesis of AgNWs are summarized with respect to product morphology and size, reaction conditions, and characterization techniques. The effect of essential factors such as reagent concentration and preparation, temperature, and reaction atmosphere that control the size, morphology, and yield of synthesized AgNWs is reviewed. Moreover, a review on the novel modified polyol process and reactor design such as continuous millifluidic and flow reactors to increase the yield of synthesized AgNWs on large scales is provided. The most recent proposed growth mechanisms and kinetics behind the polyol process are addressed. Finally, comparatively few available studies in green and sustainable development of 1D silver nanostructures through the application of natural products with inherent growth termination, stabilization, and capping characteristics are reviewed to provide an avenue to natural synthesis pathways to AgNWs. Future directions in both chemical and green synthesis approaches of AgNWs are addressed.

scholarly journals High-Yield Synthesis of Uniform Ag Nanowires with High Aspect Ratios by Introducing the Long-Chain PVP in an Improved Polyol Process

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Jie-Jun Zhu ◽  
Cai-Xia Kan ◽  
Jian-Guo Wan ◽  
Min Han ◽  
Guang-Hou Wang
Keyword(s):  
Silver Nanowires ◽  
Polyol Process ◽  
High Yield ◽  
Chemical Adsorption ◽  
Capping Agent ◽  
Molecular Weights ◽  
Aspect Ratios ◽  
Initial Stage ◽  
Ag Nanowires ◽  
Long Chain

Polyvinyl pyrrolidone (PVP) with different molecular weights was used as capping agent to synthesize silver nanowires through a polyol process. The results indicated that the yields and aspect ratios of silver nanowires were controlled by the chain length of PVP and increased with increasing the molecular weight (MW) of PVP. When the long-chain PVP-K90 (MW = 800,000) was used, the product was uniform in size and was dominated by nanowires with high aspect ratios. The growth mechanism of the nanowires was studied. It is proposed that the chemical adsorption of Ag+on the PVP chains at the initial stage promotes the growth of Ag nanowires.

scholarly journals Morphology-controlled silver nanowire synthesis using a cocamidopropyl betaine-based polyol process for flexible and stretchable electronics

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21369-21374
Author(s):  
Yuxiu Li ◽  
Yao Li ◽  
Zhengyang Fan ◽  
Hongwei Yang ◽  
Ximin Yuan ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Polyol Process ◽  
Silver Nanowire ◽  
Stretchable Electronics ◽  
Nanowire Synthesis ◽  
Cocamidopropyl Betaine ◽  
Flexible And Stretchable Electronics

Ultra-long silver nanowires with a length of ∼120 μm were synthesised using a cocamidopropyl betaine-based polyol process.

scholarly journals Flexible transparent electrodes based on silver nanowires synthesized via a simple method

2017 ◽  
Vol 4 (9) ◽  
pp. 170756 ◽  
Author(s):  
De Li ◽  
Tao Han ◽  
Lei Zhang ◽  
Huai Zhang ◽  
Hui Chen
Keyword(s):  
Silver Nanowires ◽  
Cost Effective ◽  
Silver Nanowire ◽  
Vinyl Pyrrolidone ◽  
High Yield ◽  
Transparent Electrodes ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Uv Visible ◽  
Poly Vinyl Pyrrolidone

Silver nanowires (Ag NWs) with the length of approximately 60 µm and the diameter of approximately 300 nm are prepared via a simple, cost-effective, high-yield and eco-friendly procedure under a high molar concentration ratio of silver nitrate (AgNO 3 ) solution to poly(vinyl pyrrolidone) solution. The pre-synthesized Ag NWs were analysed by scanning electron microscopy, X-ray diffraction and UV–visible spectrophotometer. Furthermore, the as-prepared silver nanowires were roll-coated on the surfaces of the polyethylene terephthalate (PET) substrates. By optimizing the concentration of silver nanowire solution, the flexible Ag NW/PET transparent electrodes with a sheet resistance of 3.8 Ω sq −1 at a transmittance of 70% can be fabricated. The results reported in this paper provide a basis for optimizing the growth of silver nanowires and performances of transparent electrodes.

scholarly journals EFFECTS OF SYNTHESIS CONDITIONS ON THE FORMATION AND MORPHOLOGY OF SILVER NANOWIRES

2018 ◽  
Vol 56 (2A) ◽  
pp. 111-117 ◽  
Author(s):  
Nguyen Truong Xuan Minh
Keyword(s):  
Silver Nanowires ◽  
Synthesis Process ◽  
Silver Nanostructures ◽  
One Dimensional ◽  
X Ray ◽  
Synthesis Conditions ◽  
Structure And Morphology ◽  
Transmission Electron ◽  
Potential Applications ◽  
Size And Morphology

Silver nanowires with one-dimensional structures have attracted much research interest due to their potential applications in several areas. It is well-known that their properties strongly depend on the size and morphology of the silver nanostructures. Therefore, in our work, silver nanostructures were prepared using a polyol process and the effects of synthesis conditions on the formation and morphology of silver nanowires were investigated. The structure and morphology of the synthesized silver nanostructures were characterized using transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). The results showed that the morphology of the silver nanowires can be effectively controlled via adjusting parameters of the synthesis process.       

scholarly journals Investigating the effect of capping agent PVP on the synthesis of silver nanowires by polyol method and its application as flexible transparent conducting electrode

2013 ◽  
Vol 16 (4) ◽  
pp. 52-60
Author(s):  
Thu Thi Hoang ◽  
Trung Quang Tran
Keyword(s):  
Large Scale ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Polyol Method ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Metal Nanostructures ◽  
Sem Images ◽  
Aspect Ratios ◽  
Transparent Conducting

In this report, we present a rapid and efficient polyol method - the solution-phase approach for the large scale synthesis of silver nanowires with diameters in the range of 40 - 50 nm, and lengths up to 20 μm. Although the polyol process is a popular method of preparing metal nanostructures, so far most of the published works mainly focused on the synthesis process regardless of amount of surfactants. In this article, we successfully synthesized large-scale uniform silver nanowires with high aspect ratios by introducing the long-chain PVP (MW = 58 000) and investigated the effect of the amount of PVP on the synthesis of Ag nanowires by studying their morphologies, structures and optical properties. The dependency of nanowire morphology and aspect ratio on synthesis parameters was shown via SEM images. The diameter of nanowires decreased when the molar ratio of PVP to silver nitrate was increased. Further more, the molar ratios decided the morphology (particle, rod or wire) of the Silve solution. Synthesized silver nanowires were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). This aqueous dispersions of silver nanowires were used to prepare thin, flexible, transparent, conducting films on polyethylene terephthalate substrate (PET) by spraying method. The prepared silver nanowire films on PET substrate had a transparency of 82% and sheet resistance of 10 Ω/□.

scholarly journals Synthesis and Growth Mechanism of Silver Nanowires through Different Mediated Agents (CuCl2and NaCl) Polyol Process

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Mohd Rafie Johan ◽  
Nurul Azri Khalisah Aznan ◽  
Soo Teng Yee ◽  
Ing Hong Ho ◽  
Soo Wern Ooi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Growth Mechanism ◽  
Silver Nanowires ◽  
Polyol Process ◽  
Silver Nanostructures ◽  
Strong Impact ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Plasmon Peak ◽  
Transmission Electron

Silver nanowires (AgNWs) have been synthesized by polyol process through different mediated agents (CuCl2and NaCl). The presence of cations and anions (Cu(II), Na+, and Cl−) has been shown to have a strong impact on the shape of silver nanostructures. The field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) show uniform nanowires. The UV-vis spectra show that plasmon peak indicated the formation of nanowires. The X-ray diffraction (XRD) pattern displayed that final product was highly crystallized and pure. The growth mechanism of AgNWs was proposed.

scholarly journals Anisotropic optical and conductive properties of oriented 1D-nanoparticle thin films made by spray-assisted self-assembly

2016 ◽  
Vol 191 ◽  
pp. 373-389 ◽  
Author(s):  
S. Sekar ◽  
V. Lemaire ◽  
H. Hu ◽  
G. Decher ◽  
M. Pauly
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Near Infrared ◽  
Energy Transport ◽  
Silver Nanowires ◽  
Grazing Incidence ◽  
Silver Nanowire ◽  
Metal Nanoparticle ◽  
Aspect Ratios ◽  
Uv Visible

We report on the fabrication of oriented anisotropic metal nanoparticle thin films made by Grazing Incidence Spraying (GIS) and on the anisotropic plasmonic properties of the resulting thin films. Gold nanorods of two different aspect ratios and silver nanowires were self-assembled as a uniaxially aligned monolayer with the GIS approach. In particular, we examine the influence of the nanowire/nanorod length and diameter on the degree of ordering determined by electron microscopy pictures. Furthermore, we show that the anisotropy of the optical properties (probed by polarized UV-visible-near infrared spectroscopy) strongly depend on the quality of alignment. The prepared monolayer thin films have an orientation order parameter of up to 0.83 for silver nanowires, which is reflected in an optical anisotropy of 0.57 in the UV-visible and 0.76 in the near infrared through the selective excitation of transverse and longitudinal surface plasmon resonance modes. The electronic transport in oriented silver nanowire monolayers is also shown to be highly directional, with the sheet resistance varying over almost an order of magnitude depending on the transport direction. Such anisotropic conductive plasmonic thin films may find applications in various fields like biochemical sensing, energy transport and harvesting or optoelectronic devices.

scholarly journals Highly Ordered Arrays of Silver Nanowires for Transparent Conducting PET Film 

2020 ◽  
Author(s):  
Gul Naz ◽  
Hafsa Asghar ◽  
Junaid Jalil ◽  
Muhammad Arshad ◽  
Rashid Ahmed ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Silver Nanowires ◽  
Average Diameter ◽  
Hydroxyethyl Cellulose ◽  
High Yield ◽  
X Rays ◽  
Aspect Ratios ◽  
Vis Spectroscopy ◽  
Mechanical Pressing ◽  
Pet Film

Silver nanowires (AgNWs) with ultra-high purity and high yield are successfully synthesized by employing a modified facile polyol method using PVP as capping and stabilizing agent. The reaction is carried out at a moderate temperature of 140 °C and mild stirring rate for about 3 hours. The prepared AgNWs are characterized by UV-Vis spectroscopy, scanning electron microscopy (SEM), X-rays diffraction (XRD) and PL spectroscopy. The luminescent AgNWs exhibit red emission which is accredited to the deep holes. The SEM results confirm the formation of AgNWs of length ranging from 35 to 40 µm and an average diameter of about 86 nm, thus their aspect ratios exceed 400. The AgNWs and hydroxyethyl cellulose (HEC) based ink is transferred to polyethylene terephthalate (PET) film by simple mechanical pressing. The PET film has retained its transparency and flexibility after AgNWs ink coating. The % transmittance of as-prepared PET film is estimated to be about 92.5% with a lower sheet resistance value ~ 20 Ω, which can make it a potential substitute to commonly used expensive indium tin oxide (ITO) films in the field of optoelectronics.  

A Simple Synthesis of the Anticancer Drug Altretamine

2020 ◽  
Vol 17 (8) ◽  
pp. 628-630
Author(s):  
Vu Binh Duong ◽  
Pham Van Hien ◽  
Tran Thai Ngoc ◽  
Phan Dinh Chau ◽  
Tran Khac Vu
Keyword(s):  
Aqueous Solution ◽  
Anticancer Drug ◽  
Potassium Hydroxide ◽  
Large Scale ◽  
Synthesis Method ◽  
Practical Method ◽  
Cyanuric Chloride ◽  
Simple Synthesis ◽  
High Yield ◽  
One Step

A simple and practical method for the synthesis on a large scale of altretamine (1), a wellknown antitumor drug, has been successfully developed. The synthesis method involves the conversion of cyanuric chloride (2) into altretamine (1) by dimethylamination of 2 with an aqueous solution of 40% dimethylamine and potassium hydroxide in 1, -dioxan 4in one step to give altretamine (1) in high yield.

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