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

Abstract

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.

Meyer-Rod Coated 2D Single-Crystalline Copper Nanoplate Film with Intensive Pulsed Light for Flexible Electrode

“…After that, a very small amount of iodine (I2, 99.8+%) (4.72 mg) was added in the same composition to the mixture solution for Cu NWs. The mixture solution was reacted in the same type of Teflon-lined autoclave at 100 • C and stirred for 12 h. The reactant solutions were washed in chloroform and DI water several times using a centrifuge, producing Cu nanoplates [7]. To make the Cu nanoplate solution, mixing the Cu nanoplates with an organic solvent containing acetone (3.7 mL), ethanol (3.8 mL), ethyl acetate (1.75 mL), isopropyl alcohol (IPA) (5 mL), and toluene (2 mL) was undertaken.…”

“…To achieve these demands, we previously demonstrated a simple method for Cu nanocrystals with large dimension from nanowires (NWs) (1D) to nanoplates (NPLs) (2D) by adding iodine (I). The combination of an additive (iodine (I)), mild reductant (glucose), stabilizer (hexadecylamine, HDA), and reaction time produced large single-crystalline 2D Cu NPLs with edge lengths up to 30 µm [7].…”

Conductive ink applications on electronic textiles

“…Bakırın oksidasyonunu engellemek için ekstra işlemlerinin yapılmaması halinde bakırın uygulama alanları sınırlı kalmaktadır [30]. Bakırın uygulama anlarını genişletebilmek amacıyla çeşitli çalışmalar gerçekleştirilmektedir [32]- [36]. Gümüş ve altın elementinin yüksek maliyetli olması ve gümüşün iyon migrasyonun fazla olması basılı elektroniklerde kullanımını kısıtlamaktadır.…”

The Green Synthesis of 2D Copper Nanosheets and Their Light Absorption

“…However, one of the important nanomaterials is copper due to its high conductivity, low cost, high abundance, and even flexibility in the form of nanowires. Furthermore, 2D copper nanosheets demonstrated higher conductivity and lower resistivity than copper nanowires or mixed products of copper nanowires and 2D nanosheets [ 25 ]. Copper-based nanomaterials have been presented in many applications such as electrocatalysts for water oxidation [ 26 ], photodetectors [ 27 ], conductive ink [ 13 ], supercapacitors [ 20 ], and conductive fillers [ 25 ].…”

“…Furthermore, 2D copper nanosheets demonstrated higher conductivity and lower resistivity than copper nanowires or mixed products of copper nanowires and 2D nanosheets [25]. Copper-based nanomaterials have been presented in many applications such as electrocatalysts for water oxidation [26], photodetectors [27], conductive ink [13], supercapacitors [20], and conductive fillers [25]. Therefore, 2D copper nanosheets are considered promising nanomaterials for the substitution of novel metal nanomaterials.…”