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

Seyul Kim, So Yeon Kim, Moon Hyun Chung, Jeonghun Kim, Jung Hyun Kim

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

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 AgNW-based 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 high-temperature 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 (H2S) 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 × 20 m in length) showed suitable electrical (Rs ∼ 75 Ω sq-1) and optical (T > 90% at 550 nm, haziness ∼1.21%, b∗ ∼ 0.72) properties to replace ITO films in touch screen panels.

Original languageEnglish
Pages (from-to)5859-5868
Number of pages10
JournalJournal of Materials Chemistry C
Volume3
Issue number22
DOIs
Publication statusPublished - 2015 Jun 14

Fingerprint

Coatings
Tin oxides
Indium
Electrodes
Oxide films
Corrosion
Hydrogen Sulfide
Touch screens
Coating techniques
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
imidazole
Boiling point
Hydrogen sulfide
Corrosion protection
Alkalinity
Organic compounds
Washing
Acidity
Silicon Dioxide
Melting point

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

@article{210abf7948cc4c1cafbd83381b2bb438,
title = "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",
abstract = "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 AgNW-based 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 high-temperature 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 (H2S) 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 × 20 m in length) showed suitable electrical (Rs ∼ 75 Ω sq-1) and optical (T > 90{\%} at 550 nm, haziness ∼1.21{\%}, b∗ ∼ 0.72) properties to replace ITO films in touch screen panels.",
author = "Seyul Kim and Kim, {So Yeon} and Chung, {Moon Hyun} and Jeonghun Kim and Kim, {Jung Hyun}",
year = "2015",
month = "6",
day = "14",
doi = "10.1039/c5tc00801h",
language = "English",
volume = "3",
pages = "5859--5868",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "Royal Society of Chemistry",
number = "22",

}

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, Seyul; Kim, So Yeon; Chung, Moon Hyun; Kim, Jeonghun; Kim, Jung Hyun.

In: Journal of Materials Chemistry C, Vol. 3, No. 22, 14.06.2015, p. 5859-5868.

Research output: Contribution to journalArticle

TY - JOUR

T1 - 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

T2 - Optimizations and mechanisms

AU - Kim, Seyul

AU - Kim, So Yeon

AU - Chung, Moon Hyun

AU - Kim, Jeonghun

AU - Kim, Jung Hyun

PY - 2015/6/14

Y1 - 2015/6/14

N2 - 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 AgNW-based 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 high-temperature 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 (H2S) 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 × 20 m in length) showed suitable electrical (Rs ∼ 75 Ω sq-1) and optical (T > 90% at 550 nm, haziness ∼1.21%, b∗ ∼ 0.72) properties to replace ITO films in touch screen panels.

AB - 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 AgNW-based 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 high-temperature 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 (H2S) 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 × 20 m in length) showed suitable electrical (Rs ∼ 75 Ω sq-1) and optical (T > 90% at 550 nm, haziness ∼1.21%, b∗ ∼ 0.72) properties to replace ITO films in touch screen panels.

UR - http://www.scopus.com/inward/record.url?scp=84930675198&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84930675198&partnerID=8YFLogxK

U2 - 10.1039/c5tc00801h

DO - 10.1039/c5tc00801h

M3 - Article

AN - SCOPUS:84930675198

VL - 3

SP - 5859

EP - 5868

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

IS - 22

ER -