Effect of temperature on the oxidation of Cu nanowires and development of an easy to produce, oxidation-resistant transparent conducting electrode using a PEDOT:PSS coating (original) (raw)

Copper Nanowires and Their Applications for Flexible, Transparent Conducting Films: A Review

Nanomaterials, 2016

Cu nanowires (NWs) are attracting considerable attention as alternatives to Ag NWs for next-generation transparent conductors, replacing indium tin oxide (ITO) and micro metal grids. Cu NWs hold great promise for low-cost fabrication via a solution-processed route and show preponderant optical, electrical, and mechanical properties. In this study, we report a summary of recent advances in research on Cu NWs, covering the optoelectronic properties, synthesis routes, deposition methods to fabricate flexible transparent conducting films, and their potential applications. This review also examines the approaches on protecting Cu NWs from oxidation in air environments.

Synthesis of oxidation-resistant electrochemical-active copper nanowires using phenylenediamine isomers

Materials & Design

Phenylenediamine (PDA) was chosen as a coordinating, reducing, and capping agent to effectively direct growth and protect against oxidation of Cu nanowires (Cu NWs) in an aqueous solution. PDA was found to reduce Cu (II) to Cu (I) at room temperature, and stabilize the resulting Cu (I) by forming a coordination complex. The presence of a stable Cu (I) complex is the key step in the synthesis of Cu NWs under mild conditions. Different PDA isomers lead to different growth paths of forming Cu NWs. Both pPDA and mPDA-synthesized Cu NWs were covered with a thin layer of polyphenylenediamine and show excellent anti-oxidation properties, even in the presence of water. The usefulness of the present and electrochemical active Cu NWs for a variety of nanotechnology applications is discussed.

Electrochemical deposition and characterization of Cu2O nanowires

Applied Physics A, 2005

Thermoelectric thin films of the ternary compounds (Bi x Sb 1Àx ) 2 Te 3 and Bi 2 (Te 1Ày Se y ) 3 were synthesized using potentiostatic electrochemical deposition on gold-coated silicon substrates from aqueous acidic solutions at room temperature. The surface morphology, elemental composition, and crystal structure of the deposited films were studied and correlated with preparation conditions. The thermoelectric properties of (Bi x Sb 1Àx ) 2 Te 3 and Bi 2 (Te 1Ày Se y ) 3 films, i.e., Seebeck coefficient and electrical resistivity, were measured after transferring the films to a nonconductive epoxy support. (Bi x Sb 1Àx ) 2 Te 3 thin films showed p-type semiconductivity, and the highest power factor was obtained for film deposited at a relatively large negative potential with composition close to Bi 0.5 Sb 1.5 Te 3 . In addition, Bi 2 (Te 1Ày Se y ) 3 thin films showed n-type semiconductivity, and the highest power factor was obtained for film deposited at a relatively small negative potential, having composition close to Bi 2 Te 2.7 Se 0.3 . In contrast to Bi 2 Te 2.7 Se 0.3 thin films, an annealing treatment was required for Bi 0.5 Sb 1.5 Te 3 thin films to achieve the same magnitude of power factor as Bi 2 Te 2.7 Se 0.3 . Therefore, Bi 2 Te 2.7 Se 0.3 thin films appear to be good candidates for multilayer preparation using electrochemical deposition, but the morphology of the films must be further improved.

Synthesis of Ultralong Copper Nanowires for High-Performance Transparent Electrodes

Journal of the American Chemical Society, 2012

Cu nanowires hold great promise for the fabrication of low-cost transparent electrodes. However, their current synthesis is mainly performed in aqueous media with poor nanowire dispersibility. We report herein the novel synthesis of ultralong single-crystalline Cu nanowires with excellent dispersibility, providing an excellent candidate material for high-performance transparent electrode fabrication.

A zinc-based shell for copper nanowires network to prevent oxidation

Although recent reported studies have shown that copper nanowires-based electrodes can replace the Indium Tin Oxide electrodes in the near future, their vulnerability to oxidation is a huge disadvantage and may slow down the replacing process. Herein, we introduced a facile and inexpensive approach to protect the copper nanowires with a thin layer of zinc oxide and brass. First, the copper nanowires were plated with zinc by applying an electroless plating technique, which is simple, controllable and guarantee an even distribution of Zn. Then a heat was applied to the electrodes in a short time to diffuse copper into zinc and form zinc oxide simultaneously. Through experiments, the final products exhibited high performance almost as well as the original electrodes while resisted well to oxidation corrosion.

Formation of Hierarchical Cuo Nanowires on a Copper Surface via a Room-Temperature Solution-Immersion Process

Journal of the Chilean Chemical Society, 2010

CuO nanowires were successfully made through a simple wet chemical method at room temperature by immersing on copper sheets in a 4 M ammonia solution for 4 days and then subjecting it to heat treatment. Immersion time and heat treatment have an important effect on the length, diameter, and density of the CuO nanostructures. X-ray powder diffraction (XRD) patterns indicated that the samples are composed of a single phase, CuO. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy studies showed that the wet-treated samples consisted of nanofiber-like structures of monoclinic CuO, while the heat-treated samples consisted of well-defined nanowires which also exhibited the monoclinic phase.

Electrical Properties of Cu Nanowires

2008 8th IEEE Conference on Nanotechnology, 2008

Copper nanowires were patterned with e-beam lithography and fabricated with an e-beam evaporated Cu film. Electrical properties, including resistivity and temperature coefficient of resistance, were characterized for Cu nanowires with a width range of 90 nm to 330 nm. It was experimentally found that the surface and size have apparent influence on the electrical properties. The measured resistivity of the Cu nanowires was found to be size dependent, which was in good agreement with the theoretical models. In addition, smaller values of the temperature coefficient of resistance were experimentally found as the wire width decreases for the Cu nanowires. The size dependent nature of the temperature coefficient of resistance was attributed to the surface and size effects based on the further demonstrative analysis. Same as Report (SAR) 18. NUMBER OF PAGES 4 19a. NAME OF RESPONSIBLE PERSON

Pulsed Electrodeposition for Copper Nanowires

Crystals, 2020

Copper nanowires (Cu NWs) are a promising alternative to indium tin oxide (ITO), for use as transparent conductors that exhibit comparable performance at a lower cost. Furthermore, Cu NWs are flexible, a property not possessed by ITO. However, the Cu NW-based transparent electrode has a reddish color and tends to deteriorate in ambient conditions due to the oxidation of Cu. In this paper, we propose a pulsed-current (PC) plating method to deposit nickel onto the Cu NWs in order to reduce oxidation over a 30-day period, and to minimize the sheet resistance. Additionally, the effects of the pulse current, duty cycle, and pulse frequency on the performance of the Cu–Ni (copper–nickel) NW films have also been investigated. As a result, the reddish color of the electrode was eliminated, as oxidation was completely suppressed, and the sheet resistance was reduced from 35 Ω/sq to 27 Ω/sq. However, the transmittance decreased slightly from 86% to 76% at a wavelength of 550 nm. The Cu–Ni NW ...

Fabrication of copper nanowires by electrodeposion method

The present work focuses on the synthesis of copper nanowires. Copper is one of the most important metals in modern electronic technology. We are trying to synthesize copper nanowires from the aqueous solution of copper (II) sulphate on glass filter paper. Electro chemical deposition technique based on the principle of electroplating was adopted for copper nanowire synthesis.Diameter and length of wire depends on the supply voltage, temperature, time for deposition. The studies have revealed the formation of fine, uniform arrays of mono and poly crystalline copper nanowires which show potential applications in nanodevices, chemical and biological sensors, optical and electronic devices because of their unique electrical, magnetic, optical as well as their mechanical properties.

Synthesis and characterization of CuO nanowires by a simple wet chemical method

Nanoscale Research Letters, 2012

We report a successful synthesis of copper oxide nanowires with an average diameter of 90 nm and lengths of several micrometers by using a simple and inexpensive wet chemical method. The CuO nanowires prepared via this method are advantageous for industrial applications which require mass production and low thermal budget technique. It is found that the concentration and the quantity of precursors are the critical factors for obtaining the desired one-dimensional morphology. Field emission scanning electron microscopy images indicate the influence of thioglycerol on the dispersity of the prepared CuO nanowires possibly due to the stabilization effect of the surface caused by the organic molecule thioglycerol. The Fourier transform infrared spectrum analysis, energy dispersive X-ray analysis, X-ray diffraction analysis, and X-ray photoemission spectrum analysis confirm clearly the formation of a pure phase high-quality CuO with monoclinic crystal structure.