Advances in protective layer-coating on metal nanowires with enhanced stability and their applications

Bang, Junhyuk; Coşkun, Şahin; Pyun, Kyung Rok; Doğanay, Doğa; Tunca, Sensu; Koylan, Serkan; Kim, Dongkwan; Ünalan, Hüsnü Emrah; Ko, Seung Hwan

doi:10.1016/j.apmt.2020.100909

Cited by 48 publications

(50 citation statements)

References 124 publications

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“…The choice of possible protective coatings should be carefully considered since they can strongly alter the intrinsic performances of the active layer. 41 The improvement of the adhesive and mechanical properties should not come at the expense of the optical properties. Three different 14 approaches were considered in this work.…”

Section: Resultsmentioning

confidence: 99%

Transparent and Mechanically Resistant Silver-Nanowire-Based Low-Emissivity Coatings

Hanauer

Celle

Crivello

et al. 2021

ACS Appl. Mater. Interfaces

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This article reports on the fabrication and investigation of low-emissivity (low-E) coatings based on random networks of silver nanowires (AgNWs). The transparent layers based on AgNWs do exhibit low emissivity while being still transparent: an overall emissivity as low as 0.21 at 78% total transmittance was obtained. A simple physical model allows to rationalize the emissivitytransparency dependence and a good agreement with experimental data is observed. This model demonstrates the role played by AgNWs which partially reflect IR photons emitted by the substrate, exacerbating then the presence of AgNWs and lowering the total emissivity. The potential use of such layers in functional devices is hampered by the poor intrinsic surface adhesion of the AgNWs, which renders the coating fragile and prone to mechanical damaging. Two very efficient encapsulation processes based on the deposition of a conformal alumina thin film using the Spatial Atomic Layer Deposition technique and the solution processed layer deposition of a polysiloxane varnish have been developed to thwart this weakness. Both coatings combine sturdy mechanical resistance relying on a strong interfacial adhesion and excellent optical transmittance properties. The performances for the mechanically resistant low-E coatings achieve an overall emissivity as low as 0.34 at 74% total transparency. The set of optical properties and mechanical resistance of the reported AgNWs based low-E coatings combined with the ease of fabrication and the cost-effective production process make it an excellent candidate for a wide set of applications, including smart windows for energy-saving buildings.

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Section: Resultsmentioning

confidence: 99%

Transparent and Mechanically Resistant Silver-Nanowire-Based Low-Emissivity Coatings

Hanauer

Celle

Crivello

et al. 2021

ACS Appl. Mater. Interfaces

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“…A minimum of 8 h of hot pressing was needed to produce a sample sufficiently tough to sustain gentle bending. However, this led to complete sintering of the nanowires and significant grain growth, as observed by SEM (Figure g-h) due to the low thermal stability of the multiply twinned nanowires. , The obstacles to densifying the nanowire products through direct pressing at ambient or elevated temperature are linked to their highly anisotropic geometry, which makes obtaining a high green body density difficult and requires substantially higher pressures than can be reached by typical cold or hot pressing …”

Section: Results and Discussionmentioning

confidence: 99%

“…The enhanced thermal stability of silver nanowires by the copper coating may be attributed to the ability of copper atoms to segregate to the grain and twin boundaries of copper . The copper coating may also inhibit the surface diffusion of silver, and it delays the onset of the Plateau–Rayleigh instability . In addition, copper atoms have a higher surface and grain boundary diffusion rate than silver, , which improves their ability to fill pores during hot pressing.…”

Section: Results and Discussionmentioning

confidence: 99%

“…In future work, it would be useful to improve the processing strategies to obtain bulk metal with a nearly 100% theoretical density, allowing a comprehensive evaluation of their mechanical properties. As a side note, the mechanisms of copper-enhanced thermal stability of silver nanowires need to be further studied, which may make it useful for the development of metal-nanowire-based transparent conductors …”

Section: Discussionmentioning

confidence: 99%

“…In this work, silver nanowires synthesized from the classical polyol route − are used as the model system to construct bulk nanostructured silver. Such nanowires have 5-fold twinning planes along their axes and are frequently used as a small model system for studying the mechanical properties of bulk metals. − Once synthesized, these independent nanowire grains are utilized as building blocks to assemble a bulk material grain-by-grain.…”

Section: Introductionmentioning

confidence: 99%

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Bulk Nanostructured Metal from Multiply-Twinned Nanowires

Prestowitz

Coşkun

et al. 2021

Nano Lett.

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Using chemically synthesized silver nanowires with 5-fold twinning planes as a model system, a bottom-up process to generate a bulk nanostructured metal has been demonstrated. Although the nanowires would be shortened and deformed during densification, they are chosen as a model system because they are currently the most scalable and convenient way to obtain Ag particles with high twinning densities. Direct cold pressing of a silver nanowire filter cake did not generate a sufficiently cohesive sample, while hot pressing at 190 °C for 8 h resulted in extensive sintering, eliminating the nanowire morphology. Copper was then electroplated on the silver nanowires as a binder and filler to increase the densification upon hot pressing; despite nonuniform plating across the thickness of the filter cake, the thermal stability of the nanowires was increased, allowing hot pressing at 390 °C. Finally, a uniform copper coating on silver nanowires was achieved by electroless plating, leading to cohesive bulk metal after hot pressing.

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Dielectric Study of Cost‐Effective, Eco‐Friendly PVA‐Glycerol Matrices with AgNW Electrodes for Transparent Flexible Humidity Sensors

Gassab

Papanastasiou

Silvestre

et al. 2022

Adv Materials Inter

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In this work, a deep insight is given into the dielectric properties and the humidity response of flexible polymer matrices, composed of polyvinyl alcohol (PVA) and glycerol (Gly), using silver nanowire networks as transparent electrodes (AgNW TE). These electrodes, known for their high electrical conductivity, optical transparency, and excellent flexibility, are deposited here by open‐air, scalable spray coating technique. Analysis of the dielectric constant ε′ and loss tangent tanδ according to the density of the AgNWs shows that the latter do not cover the entire surface with PVA and induces an interfacial polarization effect. Wide frequency range of impedance spectroscopy (1 Hz to 1 MHz) on both, PVA‐Gly samples with AgNW TE (4 Ω sq−1) networks electrodes and sputtered silver electrodes (Ag bulk el), reveal no significant change in ε′ and tanδ. Finally, the humidity sensing properties of PVA‐Gly exhibit good response between 20% to 90% humidity range and low hysteresis. This is related to the non‐continuous structure of AgNW TE. At 100 Hz, the PVA‐10 wt% Gly presents high sensitivity of 0.08 nF/% RH with an hysteresis value of about 1.5% at 70% RH. These results indicate that AgNW networks show great potential for integration in transparent and flexible humidity sensors.

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Advances in protective layer-coating on metal nanowires with enhanced stability and their applications

Cited by 48 publications

References 124 publications

Transparent and Mechanically Resistant Silver-Nanowire-Based Low-Emissivity Coatings

Transparent and Mechanically Resistant Silver-Nanowire-Based Low-Emissivity Coatings

Bulk Nanostructured Metal from Multiply-Twinned Nanowires

Dielectric Study of Cost‐Effective, Eco‐Friendly PVA‐Glycerol Matrices with AgNW Electrodes for Transparent Flexible Humidity Sensors

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