Facile control of copper nanowire dimensions via the Maillard reaction: using food chemistry for fabricating large-scale transparent flexible conductors

Han

et al. 2017

Small

Large-scale 2D single-crystalline copper nanoplates (Cu NPLs) are synthesized by a simple hydrothermal method. The combination of a mild reductant, stabilizer, and shape modifier allows the dimensional control of the Cu nanocrystals from 1D nanowires (NWs) to 2D nanoplates. High-resolution transmission electron microscopy (HR-TEM) reveals that the prepared Cu NPLs have a single-crystalline structure. From the X-ray photoelectron spectroscopy (XPS) analysis, it is found that iodine plays an important role in the modification of the copper nanocrystals through the formation of an adlayer on the basal plane of the nanoplates. Cu NPLs with an average edge length of 10 μm are successfully synthesized, and these Cu NPLs are the largest copper 2D crystals synthesized by a solution-based process so far. The application of the metallic 2D crystals as a semitransparent electrode proves their feasibility as a conductive filler, exhibiting very low sheet resistance (0.4 Ω ▫ ) compared to Cu NWs and a transmittance near 75%. The efficient charge transport is due to the increased contact area between each Cu NPL, i.e., so-called plane contact (2D electrical contact). In addition, this type of contact enhances the current-carrying capability of the Cu NPL electrodes, implying that the large-size Cu NPLs are promising conductive fillers for printable electrode applications.

Section: Resultsmentioning

confidence: 99%

2D Single‐Crystalline Copper Nanoplates as a Conductive Filler for Electronic Ink Applications

Han

et al. 2017

Small

“…2f after the reaction [54]. It was found that glucose alone could not reduce Cu ions to metallic Cu, and rather a Maillard reaction took place between alkylamines and glucose and that this reaction was necessary to produce the reductones which in turn reduced Cu ion complexes [54,63]. This reaction was further optimized for the scale up using an in-situ seed-mediated two-step strategy to synthesize well-defined CuNWs in high yield, which was 2.4 times higher than that of the conventional methods with the assistance of Cu nanodots formed in the seeding step.…”

Section: Copper Nanowiresmentioning

confidence: 99%

“…The ink preparetion is therefore important to allow a uniform deposition of copper nanomaterial assemblies. Solvents, such as isopropanol (IPA), ethanol, hexane, or toluene, are used to improve the dispersion stability [63,85,[89][90][91][92][93][94]. The Cu content can range from 0.6 to 1.2 mg mL −1 in the inks [91].…”

Section: Spray Coatingmentioning

confidence: 99%

Copper nanomaterials and assemblies for soft electronics

Yang

Zhu

2019

Sci. China Mater.

Soft electronics that can simultaneously offer electronic functions and the capability to be deformed into arbitrary shapes are becoming increasingly important for wearable and bio-implanted applications. The past decade has witnessed tremendous progress in this field with a myriad of achievements in the preparation of soft electronic conductors, semiconductors, and dielectrics. Among these materials, copper-based soft electronic materials have attracted considerable attention for their use in flexible or stretchable electrodes or interconnecting circuits due to their low cost and abundance with excellent optical, electrical and mechanical properties. In this review, we summarize the recent progress on these materials with the detailed discussions of the synthesis of copper nanomaterials, approaches for their assemblies, strategies to resist the ambient corrosion, and their applications in various fields including flexible electrodes, sensors, and other soft devices. We conclude our discussions with perspectives on the remaining challenges to make copper soft conductors available for more widespread applications.

J. Japan Inst. Metals and Materials

“…．CuNWs の量産化のための水熱合成では，アミン有機物が重要な役割を果たすことが知られている．CuNWs の成長については，アミンが銅核の特定の結晶面を覆うことで，残された結晶面に沿って一方向に成長すると言われており，アミンが粒子の成長方向を制御する重要な役割を果たすと考えられている [16][17][18]…”

unclassified

Composition of Copper Nanowires and Preparation of Transparent Conductive Film by Intense Pulse Light Sintering

Gao

Ishina

Jiu

et al. 2017

Copper nanowires （CuNWs） with low manufacture price and high electrical conductivity have been successfully synthesized by a simple hydrothermal process. The molecular weight of amine, which was used as surfactant, largely influenced the morphology of synthesis Cu products. As-synthesized CuNWs were coated onto substrate and treated by intense pulse light （IPL） technique in ambient atmosphere. The instantaneous deoxidization and decomposition organics on the surface of the CuNWs contributed to the formation of transparent conductive film. A film with low sheet resistance of 13.4 Ω/□ and high transmittance of 79％ was obtained. Furthermore, stretchable conductor was also realized by coating the CuNWs onto flexible substrate and following IPL sintering treatment. ［doi:10.2320/jinstmet.J2017013］