Silver‐Nanowire Mesh‐Structured Transparent Conductive Film with Improved Transparent Conductive Properties and Mechanical Performance

Abstract

Silver nanowires (AgNWs) are ideal materials for fabricating flexible TCFs on various types of substrates because of the high conductivity and good flexibility of silver. Previous research has developed various methods to fabricate, [14][15][16][17] coat, [18][19][20] and treat [21][22][23][24][25] AgNWs. In most studies, AgNWs are used to form random networks, and the size of the AgNWs mostly determines the properties of the TCF. [26] Because a metal grid can be used as a TCF, this study will determine whether a mesh structure is useful for improving the properties of an AgNW network. The presence of holes can enhance the transmittance of the network, and as the AgNWs are restrained to the mesh region, it is easier for an individual wire to contact other wires. In addition, the mesh structure may improve the flexibility of the network. [27] Findings from previous studies support the methods proposed in this study. Toakuno [28] et al. used a bubble template to fabricate meshstructured Ag nanowires. By adding a surfactant to the dispersion of AgNWs and shaking the solution, numerous bubbles were generated, and this became the template for patterning the AgNW network. The transparent conductive performance of the bubble mesh-structured AgNW film was superior to that of a random AgNW network.Similarly, Kwon et al. [29] used a liquid template to generate a mesh structure. A water insoluble liquid was mixed with water, and an intermediate agent was used to stabilize the dispersion. When the dispersion was coated onto a substrate, the intermediate agent evaporated first, leading to the separation of the water and the water insoluble liquid, thus forming a mesh structure.Ha and Jo [30] obtained AgNW grids using a micromoldingin-capillary technique and combined a random network with a grid-patterned network. The hybrid electrodes exhibited a significantly improved sheet resistance, slightly decreased transmittance, and better mechanical flexibility compared to those of the random network.A mesh structure may enhance the transparent conductive properties and mechanical performance of the AgNW network. Physical models of many different types of TCFs have been studied, [31] but there is still a lack of a quantitative study, especially for mesh-structured nanowire networks.In this study, AgNWs were synthesized by a modified polyol method, [32] and a simple template method was used to fabricate Silver nanowires (AgNWs) are an optimum material for fabricating flexible transparent conductive films (TCFs), which are the primary materials in flexible optoelectronic devices. In most studies, TCFs are produced by coating AgNW onto a substrate to form a random network. However, according to some reports, a mesh-structured network may allow superior performance. The effects of a mesh structure are quantitatively studied, a simple calculation method to derive property curves of mesh-structured networks from those of random networks is presented, and a rule to fabricate mesh-structured TCFs with improved performance is determined. Diff...

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“…It is easy to understand the independence of the transmittance on the interlayer spacing. Usually, the transmission of visible light through the MA film closely correlates with the area fraction of the holes in the AgNW network. , Hence, it is reasonable that the MA film and the d -MA film with the same total loading of AgNWs should exhibit similar transmittances (Figure S9). Interestingly, the EMI shielding performance is improved by the layer-structured design at the same total loadings of AgNWs.…”

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“…Figure 2c shows the change in sheet resistance ( R s ) of Ag NW–mesh electrodes versus OAF for three different AMD values, showing that the values calculated from Equation () and the experimental values are relatively well matched. [ 32 ] As the AMD decreased, the R s value of the mesh electrode decreased, due to the decrease in sheet resistance ( R s,0 ) of the grid line itself in Table S1, Supporting Information. The decrease in R s with decreasing AMD was also observed in Ag NP–mesh as shown in Figure S3b, Supporting Information.…”

“…Alternatively, there have been attempts to fabricate a metal mesh to apply to an FTE to increase the optical-electrical properties. [25][26][27][28][29][30][31][32] Metal mesh electrodes exhibit light transmittance and sheet resistance superior to those of metal NW electrodes, with the advantage of control of line width and pitch spacing to adjust the transmittance and sheet resistance according to a particular purpose. [27] Thus, various authors have attempted to apply metal mesh electrodes to flexible devices.…”

“…Ha and Jo [ 31 ] fabricated Ag NW–mesh patterns with a line width of 20 μm and a line spacing of 50 μm transferred on a polyethylene‐naphthalate (PEN) substrate using a micromolding‐in‐capillary technique, reporting 10 000 cycles of bending resistance at a 5 mm ROC. Recently, Hu et al [ 32 ] also reported improved conductivity and bending durability by producing Ag NW–mesh transferred on a PET substrate using gravure templates and protrusion method, but a 300% increase in resistance was observed after 5000 cycles of bending test for 1 mm ROC.…”

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“…Rare earth (RE) luminescent materials have many applications in many fields due to their unique optical characteristics, good stability and easy preparation [24][25][26] , such as optoelectronic devices, anti-counterfeiting technology, optical windows and miRNA detection [27][28][29][30] Among them, Tb 3 + ions and Eu 3 + ions are the activators that produce efficient green and red emission light respectively, so RE complexes (RE=Tb, Eu) are often used as luminescent materials by researchers [31][32][33] . Cobalt ferrite nanoparticles (CoFe 2 O NPs) are proverbially used as magnetic materials due to their strong magnetism and good biocompatibility.…”