Abstract
One of the most critical issues in electrochromic (EC) films based on transition metal oxides such as tungsten oxides (WOx) is their poor charge transfer property, which is closely related to EC performance. Herein, high-performance EC films with enhanced charge transport are prepared using small-molecule linkers and transparent/conductive nanoparticles (NPs). In this work, oleylamine (OAm)-stabilized WO2.72 nanorods (NRs) and OAm-stabilized indium tin oxide (ITO) NPs are layer-by-layer (LbL)-assembled with small-molecule linkers (tris(2-aminoethyl)amine, TREN) using a ligand-exchange reaction between bulky/insulating OAm ligands and TREN molecules. In this case, there is only one TREN layer between neighboring inorganic components (WO2.72 NRs and/or ITO NPs), resulting in a dramatic decrease in the separation distance. This minimized separation distance as well as the periodic insertion of transparent/conductive ITO NPs can significantly reduce the charge transfer resistance within WO2.72 NR-based EC films, which remarkably improves their EC performance. Compared to EC films without ITO NPs, the formed EC films with ITO NPs exhibit faster switching responses (4.1 times in coloration time and 3.5 times in bleaching time) and a maximum optical modulation of approximately 55.8%. These results suggest that electrochemical performance, including EC performance, can be significantly improved through structural/interfacial designing of nanocomposites.
| Original language | English |
|---|---|
| Pages (from-to) | 17815-17830 |
| Number of pages | 16 |
| Journal | Nanoscale |
| Volume | 11 |
| Issue number | 38 |
| DOIs | |
| Publication status | Published - 2019 Oct 14 |
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ASJC Scopus subject areas
- Materials Science(all)
Cite this
High-performance electrochromic films with fast switching times using transparent/conductive nanoparticle-modulated charge transfer. / Yun, Junsang; Song, Yongkwon; Cho, Ikjun; Ko, Yongmin; Kwon, Cheong Hoon; Cho, Jinhan.
In: Nanoscale, Vol. 11, No. 38, 14.10.2019, p. 17815-17830.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High-performance electrochromic films with fast switching times using transparent/conductive nanoparticle-modulated charge transfer
AU - Yun, Junsang
AU - Song, Yongkwon
AU - Cho, Ikjun
AU - Ko, Yongmin
AU - Kwon, Cheong Hoon
AU - Cho, Jinhan
PY - 2019/10/14
Y1 - 2019/10/14
N2 - One of the most critical issues in electrochromic (EC) films based on transition metal oxides such as tungsten oxides (WOx) is their poor charge transfer property, which is closely related to EC performance. Herein, high-performance EC films with enhanced charge transport are prepared using small-molecule linkers and transparent/conductive nanoparticles (NPs). In this work, oleylamine (OAm)-stabilized WO2.72 nanorods (NRs) and OAm-stabilized indium tin oxide (ITO) NPs are layer-by-layer (LbL)-assembled with small-molecule linkers (tris(2-aminoethyl)amine, TREN) using a ligand-exchange reaction between bulky/insulating OAm ligands and TREN molecules. In this case, there is only one TREN layer between neighboring inorganic components (WO2.72 NRs and/or ITO NPs), resulting in a dramatic decrease in the separation distance. This minimized separation distance as well as the periodic insertion of transparent/conductive ITO NPs can significantly reduce the charge transfer resistance within WO2.72 NR-based EC films, which remarkably improves their EC performance. Compared to EC films without ITO NPs, the formed EC films with ITO NPs exhibit faster switching responses (4.1 times in coloration time and 3.5 times in bleaching time) and a maximum optical modulation of approximately 55.8%. These results suggest that electrochemical performance, including EC performance, can be significantly improved through structural/interfacial designing of nanocomposites.
AB - One of the most critical issues in electrochromic (EC) films based on transition metal oxides such as tungsten oxides (WOx) is their poor charge transfer property, which is closely related to EC performance. Herein, high-performance EC films with enhanced charge transport are prepared using small-molecule linkers and transparent/conductive nanoparticles (NPs). In this work, oleylamine (OAm)-stabilized WO2.72 nanorods (NRs) and OAm-stabilized indium tin oxide (ITO) NPs are layer-by-layer (LbL)-assembled with small-molecule linkers (tris(2-aminoethyl)amine, TREN) using a ligand-exchange reaction between bulky/insulating OAm ligands and TREN molecules. In this case, there is only one TREN layer between neighboring inorganic components (WO2.72 NRs and/or ITO NPs), resulting in a dramatic decrease in the separation distance. This minimized separation distance as well as the periodic insertion of transparent/conductive ITO NPs can significantly reduce the charge transfer resistance within WO2.72 NR-based EC films, which remarkably improves their EC performance. Compared to EC films without ITO NPs, the formed EC films with ITO NPs exhibit faster switching responses (4.1 times in coloration time and 3.5 times in bleaching time) and a maximum optical modulation of approximately 55.8%. These results suggest that electrochemical performance, including EC performance, can be significantly improved through structural/interfacial designing of nanocomposites.
UR - http://www.scopus.com/inward/record.url?scp=85072943683&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072943683&partnerID=8YFLogxK
U2 - 10.1039/c9nr06259a
DO - 10.1039/c9nr06259a
M3 - Article
C2 - 31552994
AN - SCOPUS:85072943683
VL - 11
SP - 17815
EP - 17830
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 38
ER -