Abstract
We demonstrate the on-surface formation of homogeneous and uniform electrochromic films via ultrasonic spray coating. This fully automated process is capable of fabricating metallo-organic films on transparent conducting oxides (TCOs) on glass or flexible poly(ethylene terephthalate) (PET) with surface areas of up to 36 cm2 and film thicknesses of half a micron. The assembly process involves alternatingly spray-coating dilute solutions of structurally well-defined iron polypyridyl ([Fe(mbpy-py)3]2+) complexes and bis(benzonitrile)palladium dichloride (Pd(PhCN)2Cl2) onto conductive substrates, where the latter palladium salt was used as the inorganic cross-linker. The on-surface self-assembled three-dimensional networks are intensely colored and were subsequently integrated into laminated electrochromic devices (ECDs) containing a lithium-based gel electrolyte. The ECDs retain their intense color in the ground state, having a ΔTmax of 40-49% at λmax ≈ 600 nm, and can be operated for up to 1500 redox cycles. The fluorine-doped tin oxide counter electrode coated with poly(3,4-ethylene-dioxythiophene)polystyrene sulfonate (PEDOT:PSS) as a charge-storage layer resulted in these stable devices. A significant decrease in the potential window of ΔE ≈ 2.5 V was achieved by using a metal grid on PET as the counter electrode. The operation of the electrochromic films is diffusion-controlled, and the diffusion coefficients (Df) reflect their molecular densities. During these studies, we found that ClO4- is a suitable counterion of the lithium-based electrolytes for optimal ECD performance.
| Original language | English |
|---|---|
| Pages (from-to) | 22858-22868 |
| Number of pages | 11 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 11 |
| Issue number | 25 |
| DOIs | |
| Publication status | Published - Jun 26 2019 |
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Keywords
- coordination chemistry
- electrochromic devices
- electrochromics
- metallo-organics
- self-assembly
- spray-coating
- thin films
ASJC Scopus subject areas
- Materials Science(all)
Cite this
On-Surface Self-Assembly of Stimuli-Responsive Metallo-Organic Films : Automated Ultrasonic Spray-Coating and Electrochromic Devices. / Malik, Naveen; Elool Dov, Neta; De Ruiter, Graham; Lahav, Michal; van der Boom, Milko.
In: ACS Applied Materials and Interfaces, Vol. 11, No. 25, 26.06.2019, p. 22858-22868.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - On-Surface Self-Assembly of Stimuli-Responsive Metallo-Organic Films
T2 - Automated Ultrasonic Spray-Coating and Electrochromic Devices
AU - Malik, Naveen
AU - Elool Dov, Neta
AU - De Ruiter, Graham
AU - Lahav, Michal
AU - van der Boom, Milko
PY - 2019/6/26
Y1 - 2019/6/26
N2 - We demonstrate the on-surface formation of homogeneous and uniform electrochromic films via ultrasonic spray coating. This fully automated process is capable of fabricating metallo-organic films on transparent conducting oxides (TCOs) on glass or flexible poly(ethylene terephthalate) (PET) with surface areas of up to 36 cm2 and film thicknesses of half a micron. The assembly process involves alternatingly spray-coating dilute solutions of structurally well-defined iron polypyridyl ([Fe(mbpy-py)3]2+) complexes and bis(benzonitrile)palladium dichloride (Pd(PhCN)2Cl2) onto conductive substrates, where the latter palladium salt was used as the inorganic cross-linker. The on-surface self-assembled three-dimensional networks are intensely colored and were subsequently integrated into laminated electrochromic devices (ECDs) containing a lithium-based gel electrolyte. The ECDs retain their intense color in the ground state, having a ΔTmax of 40-49% at λmax ≈ 600 nm, and can be operated for up to 1500 redox cycles. The fluorine-doped tin oxide counter electrode coated with poly(3,4-ethylene-dioxythiophene)polystyrene sulfonate (PEDOT:PSS) as a charge-storage layer resulted in these stable devices. A significant decrease in the potential window of ΔE ≈ 2.5 V was achieved by using a metal grid on PET as the counter electrode. The operation of the electrochromic films is diffusion-controlled, and the diffusion coefficients (Df) reflect their molecular densities. During these studies, we found that ClO4- is a suitable counterion of the lithium-based electrolytes for optimal ECD performance.
AB - We demonstrate the on-surface formation of homogeneous and uniform electrochromic films via ultrasonic spray coating. This fully automated process is capable of fabricating metallo-organic films on transparent conducting oxides (TCOs) on glass or flexible poly(ethylene terephthalate) (PET) with surface areas of up to 36 cm2 and film thicknesses of half a micron. The assembly process involves alternatingly spray-coating dilute solutions of structurally well-defined iron polypyridyl ([Fe(mbpy-py)3]2+) complexes and bis(benzonitrile)palladium dichloride (Pd(PhCN)2Cl2) onto conductive substrates, where the latter palladium salt was used as the inorganic cross-linker. The on-surface self-assembled three-dimensional networks are intensely colored and were subsequently integrated into laminated electrochromic devices (ECDs) containing a lithium-based gel electrolyte. The ECDs retain their intense color in the ground state, having a ΔTmax of 40-49% at λmax ≈ 600 nm, and can be operated for up to 1500 redox cycles. The fluorine-doped tin oxide counter electrode coated with poly(3,4-ethylene-dioxythiophene)polystyrene sulfonate (PEDOT:PSS) as a charge-storage layer resulted in these stable devices. A significant decrease in the potential window of ΔE ≈ 2.5 V was achieved by using a metal grid on PET as the counter electrode. The operation of the electrochromic films is diffusion-controlled, and the diffusion coefficients (Df) reflect their molecular densities. During these studies, we found that ClO4- is a suitable counterion of the lithium-based electrolytes for optimal ECD performance.
KW - coordination chemistry
KW - electrochromic devices
KW - electrochromics
KW - metallo-organics
KW - self-assembly
KW - spray-coating
KW - thin films
UR - http://www.scopus.com/inward/record.url?scp=85067343587&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85067343587&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b05512
DO - 10.1021/acsami.9b05512
M3 - Article
VL - 11
SP - 22858
EP - 22868
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 25
ER -