Journal ArticleDOI
Large-scale synthesis of copper nanoparticles by chemically controlled reduction for applications of inkjet-printed electronics.
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TLDR
In this study, copper nanoparticles were synthesized through a relatively large-scale, high-throughput (0.2 M) process through the chemical reduction of copper sulfate with sodium hypophosphite in ethylene glycol within the presence of a polymer surfactant (PVP), which was included to prevent aggregation and give dispersion stability to the resulting colloidal nanoparticles.Abstract:
Copper nanoparticles are being given considerable attention as of late due to their interesting properties and potential applications in many areas of industry. One such exploitable use is as the major constituent of conductive inks and pastes used for printing various electronic components. In this study, copper nanoparticles were synthesized through a relatively large-scale (5 l), high-throughput (0.2 M) process. This facile method occurs through the chemical reduction of copper sulfate with sodium hypophosphite in ethylene glycol within the presence of a polymer surfactant (PVP), which was included to prevent aggregation and give dispersion stability to the resulting colloidal nanoparticles. Reaction yields were determined to be quantitative while particle dispersion yields were between 68 and 73%. The size of the copper nanoparticles could be controlled between 30 and 65 nm by varying the reaction time, reaction temperature, and relative ratio of copper sulfate to the surfactant. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) images of the particles revealed a spherical shape within the reported size regime, and x-ray analysis confirmed the formation of face-centered cubic (FCC) metallic copper. Furthermore, inkjet printing nanocopper inks prepared from the polymer-stabilized copper nanoparticles onto polyimide substrates resulted in metallic copper traces with low electrical resistivities (≥3.6 µΩ cm, or ≥2.2 times the resistivity of bulk copper) after a relatively low-temperature sintering process (200 °C for up to 60 min).read more
Citations
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Journal ArticleDOI
Conductive Nanomaterials for Printed Electronics
TL;DR: This is a review on recent developments in the field of conductive nanomaterials and their application in printed electronics, with particular emphasis on inkjet printing of ink formulations based on metal nanoparticles, carbon nanotubes, and graphene sheets.
Journal ArticleDOI
Metal-based Inkjet Inks for Printed Electronics
TL;DR: A review on applications of metal-based inkjet inks for printed electronics with a particular focus on inks con- taining metal nanoparticles, complexes and metallo-organic compounds is presented in this article.
Journal ArticleDOI
Synthesis and optical properties of copper nanoparticles prepared by a chemical reduction method
TL;DR: In this article, copper nanoparticles were synthesized through the chemical reduction of copper sulfate with sodium borohydride in water without inert gas protection, and ascorbic acid was employed as a protective agent to prevent the nascent Cu nanoparticles from oxidation during the synthesis process and in storage.
Journal ArticleDOI
Synthesis of highly stable dispersions of nanosized copper particles using L-ascorbic acid
TL;DR: In this article, the authors synthesize high stable dispersions of nanosized copper particles with an average particle size less than 2 nm using a straightforward, cost-effective, and green method.
Journal ArticleDOI
Copper Nanoparticles for Printed Electronics: Routes Towards Achieving Oxidation Stability
TL;DR: This paper provides a review on the synthesis of copper nanoparticles, mainly by wet chemistry routes, and their utilization in printed electronics.
References
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Journal ArticleDOI
High-Resolution Inkjet Printing of All-Polymer Transistor Circuits
Henning Sirringhaus,Takeo Kawase,Richard H. Friend,Tatsuya Shimoda,M. Inbasekaran,Weishi Wu,E. P. Woo +6 more
TL;DR: It is shown that the use of substrate surface energy patterning to direct the flow of water-based conducting polymer inkjet droplets enables high-resolution definition of practical channel lengths of 5 micrometers, and high mobilities were achieved.
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Heat transfer enhancement of nanofluids
Yimin Xuan,Qiang Li +1 more
TL;DR: In this article, the authors present a procedure for preparing a nanofluid which is a suspension consisting of nanophase powders and a base liquid, and their TEM photographs are given to illustrate the stability and evenness of suspension.
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Inkjet Printing for Materials and Devices
TL;DR: Inkjet printing has been used as a free-form fabrication method for building three-dimensional parts and is being explored as a way of printing electrical and optical devices, especially where these involve organic components.
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Ink-jet printed nanoparticle microelectromechanical systems
TL;DR: In this paper, the authors reported a high-Q resonant inductive coil, linear and rotary electrostatic-drive motors, and in-plane and vertical electrothermal actuators.
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Facile synthesis of superparamagnetic magnetite nanoparticles in liquid polyols.
TL;DR: The results show that as-prepared magnetite nanoparticles are monodisperse, highly crystalline and superparamagnetic at room temperature.