Highly reliable AgNW/PEDOT:PSS hybrid films: efficient methods for enhancing transparency and lowering resistance and haziness

Kim, Seyul; Kim, So Yeon; Kim, Jeonghun; Kim, Jung Hyun

doi:10.1039/c4tc00686k

Cited by 111 publications

(103 citation statements)

References 39 publications

(40 reference statements)

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“…Before spin-coating, PEDOT:PSS solutions were mixed with 5 wt% of dimethyl sulfoxide (DMSO), and then the solution mixtures were filtered through a 0.45 mm syringe filter (PVDF) to remove impurities and aggregated particles. 23 As a result, electrical charges can be more efficiently transported between AgNWs through PEDOT:PSS. PSSA generally dissociates into H + and PSS À in water, PSSA -H + + PSS À .…”

Section: Resultsmentioning

confidence: 99%

A one-step roll-to-roll process of stable AgNW/PEDOT:PSS solution using imidazole as a mild base for highly conductive and transparent films: optimizations and mechanisms

Kim

Chung

et al. 2015

J. Mater. Chem. C

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A recent increase in the demand for transparent electrodes has led to shortage in supply and an increase in the price of indium tin oxide (ITO) films deposited by sputter coating owing to coating speed limitations. Furthermore, flexibility has become one of the essential properties of transparent electrodes, accounting for the rapidly changing trend in electronics. These problems can be overcome by AgNWbased films suitable for flexible and stable conductive electrodes by using wet-coating-processable material and roll-to-roll coating. In this work, we developed an effective method to fabricate a highly conductive, transparent, and stable AgNW/PEDOT:PSS film using roll-to-roll slot-die coating. This coating technique provides higher line speed and greater coating uniformity. Furthermore, the optimized AgNW/PEDOT:PSS solution allows direct one-step coating without any post-treatment, such as hightemperature annealing, mechanical pressure, and solvent washing. We also studied the mechanisms of AgNW corrosion induced by the acidity of PEDOT:PSS and by hydrogen sulfide (H 2 S) and carbonyl sulfide (OCS) of the atmosphere. Corrosion could be prevented by neutralizing PEDOT:PSS using imidazole, which is a suitable organic compound in terms of both material and processing properties owing to its mild basicity and high melting and boiling points. In addition, the over-coating by a silica-based protecting layer on the AgNW/PEDOT:PSS film resulted in enhanced corrosion protection. The resulting roll film (460 mm in width Â 20 m in length) showed suitable electrical (R s B 75 O sq À1 ) and optical (T 4 90% at 550 nm, haziness B1.21%, b* B 0.72) properties to replace ITO films in touch screen panels.

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Section: Resultsmentioning

confidence: 99%

A one-step roll-to-roll process of stable AgNW/PEDOT:PSS solution using imidazole as a mild base for highly conductive and transparent films: optimizations and mechanisms

Kim

Chung

et al. 2015

J. Mater. Chem. C

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“…A silver grid/PEDOT:PSS hybrid fi lm with high conductivity and excellent stability is successfully fabricated. Although some work has been conducted on fabricating silver-PEDOT:PSS composites to enhance the transparency, conductivity, and stability in air, [32][33][34][35][36] there is a lack of comprehensive research on their electrochemical applications, such as for supercapacitors, electrochromism, electrocatalysis, etc. This hybrid structure presents a large optical modulation of 81.9% at 633 nm, fast switching, and high coloration effi ciency (124.5 cm 2 C −1 ).…”

Section: Doi: 101002/aenm201501882mentioning

confidence: 99%

Highly Stable Transparent Conductive Silver Grid/PEDOT:PSS Electrodes for Integrated Bifunctional Flexible Electrochromic Supercapacitors

Cai

Darmawan

Cui

et al. 2015

Advanced Energy Materials

410

285

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theoretical and practical aspects of supercapacitors in recent years. [4][5][6] Still, supercapacitors with more functionality and novel features are being sought to extend their application range. For example, fl exible, stretchable, and wearable supercapacitors have been developed to meet the requirements of portable and wearable electronics. [7][8][9][10] It would be highly attractive to integrate both an energy-storage and an electrochromism functionality into one device for multiple applications. Such device could be used not only for energy-storage smart windows, which can store energy by charging the window and adjusting the lighting and heating of the building, [ 11,12 ] but also for sensing variations in the level of stored energy and being able to respond to the variations in a noticeable and predictable manner. [13][14][15][16] As a key component of these smart devices, the transparent electrodes used not only need to be highly transparent but also highly conductive to simultaneously meet the needs of charging/discharging under high current density conditions and that of fast coloration switching speeds. However, the most commonly used transparent conducting electrodes are indium tin oxide (ITO)-coated glass, [ 11,16 ] fl uorine doped tin oxide (FTO)-coated glass, [ 13,15 ] poly(3,4-ethylenedioxythiophene)poly(styrene sulfonate) (PEDOT:PSS), [ 12 ] and carbon nanotubes. [ 14 ] The sheet resistance of these transparent conducting electrodes is in the range of tens to hundreds of Ω per square, which could hinder the device charging/discharging process and may lead to the color changes lagging behind the changes in the stored energy, especially under high current densities. In addition, ITO and FTO as transparent electrodes are unsuitable for fl exible electronics applications because of their brittleness and high cost of the preparation procedure. [17][18][19] Therefore, it is very important to design an electrode with a low electrical resistance and a high optical transmittance for smart energystorage device applications.A variety of fl exible transparent electrodes have been investigated as low-cost ITO substitutes, including conducting polymers, [ 20 ] carbon nanotubes (CNTs), [ 21 ] graphene, [ 22 ] metal nanowires, [ 23,24 ] and metal grids. [25][26][27] Among these fl exible Silver grids are attractive for replacing indium tin oxide as fl exible transparent conductors. This work aims to improve the electrochemical stability of silverbased transparent conductors. A silver grid/PEDOT:PSS hybrid fi lm with high conductivity and excellent stability is successfully fabricated. Its functionality for fl exible electrochromic applications is demonstrated by coating one layer of WO 3 nanoparticles on the silver grid/PEDOT:PSS hybrid fi lm. This hybrid structure presents a large optical modulation of 81.9% at 633 nm, fast switching, and high coloration effi ciency (124.5 cm 2 C −1 ). More importantly, an excellent electrochemical cycling stability (sustaining 79.1% of their initial transmittance modulation a...

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“…Obviously, the CeO 2 nanomaterials exhibit high activity for o-xylene oxidation which is similar to those of noble metal catalysts (supported Pt and Pd catalysts), while much higher than those of noble-metal-free catalysts reported elsewhere (Table S1 †). [33][34][35][36][37][38][39] The durability of the CeO 2 rods for o-xylene oxidation was also evaluated at 220°C, and the results are shown in Fig. 2.…”

Section: Catalytic Activity Of Nanoceria For O-xylene Oxidationmentioning

confidence: 99%

Shape dependence of nanoceria on complete catalytic oxidation of o-xylene

Wang

Zhang

et al. 2016

Catal. Sci. Technol.

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BTX (benzene, toluene, and xylene) in atmosphere, mainly emitted from various industrial processes and transportation activities, are of particular concern due to their potentially highly toxic effects on human health. Catalytic oxidation of o-xylene was investigated on nanosized CeO 2 particles, cubes, and rods, among which rods show the highest activity, which is comparable with those of traditional noble-metal catalysts. CeO 2 nanorods also exhibit long durability for o-xylene oxidation, without deactivation during a 50 h time-on stream test. Over the CeO 2 rods and particles, the presence of water vapor slightly decreased o-xylene conversion, while water vapor enhanced o-xylene oxidation on the CeO 2 cubes.High-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, positron annihilation spectroscopy, and O 2 temperature-programmed desorption measurements revealed that ceria rods enclosed by (111) and (100) facets exhibit the highest concentration of oxygen vacancy clusters (VCs), the presence of which promoted the adsorption of molecular oxygen. The lower the temperature for desorption of chemisorbed O 2 species is, the higher is the activity for o-xylene oxidation, identifying the key role of VCs in this reaction via the activation of molecular oxygen over nanoceria.The finding may also be fundamental for designing ceria-based catalysts with better performance for catalytic oxidation of volatile organic compounds.

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Highly reliable AgNW/PEDOT:PSS hybrid films: efficient methods for enhancing transparency and lowering resistance and haziness

Abstract: Multi-layer coated AgNW/PEDOT:PSS films show excellent electrical standard deviation and enhanced optical properties without any further process. Furthermore, introduction of PEDOT:PSS could reduce the standard deviation to below 2.

Cited by 111 publications

References 39 publications

A one-step roll-to-roll process of stable AgNW/PEDOT:PSS solution using imidazole as a mild base for highly conductive and transparent films: optimizations and mechanisms

A one-step roll-to-roll process of stable AgNW/PEDOT:PSS solution using imidazole as a mild base for highly conductive and transparent films: optimizations and mechanisms

Highly Stable Transparent Conductive Silver Grid/PEDOT:PSS Electrodes for Integrated Bifunctional Flexible Electrochromic Supercapacitors

Shape dependence of nanoceria on complete catalytic oxidation of o-xylene

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