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Park C, Na J, Kim E. Cross Stacking of Nanopatterned PEDOT Films for Use as Soft Electrodes. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28802-28809. [PMID: 28800216 DOI: 10.1021/acsami.7b07799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cross stacking of nanopatterned conductive polymer film was explored using a sacrificial soft template made of nanopatterned polystyrene (PS) film as a guide for nanopatterned conductive polymer film. For use as a conductive film, the PS pattern was filled with poly(3,4-ethylenedioxythiophene) (PEDOT), and then completely removed, to generate single-patterned PEDOT (SPDOT) film having a conductivity of 1079 S/cm, which was comparable to the pristine unpatterned PEDOT (UPDOT) film on a glass slide. SPDOT layers were stacked across each other to form double-layered (DPDOT) and multiple-layered patterned PEDOT film on a glass slide or polymeric substrate. The patterned PEDOT film showed enhanced optical and electrochemical activity; specifically as compared to the UPDOT film on a glass slide, the DPDOT film showed an increase in reflectance and an enhanced electrochemically active surface by 23.4% and 32.8%, respectively. The patterned PEDOT film on a polymer substrate showed high bendability up to being completely folded and maintained its conductivity for over 10 000 cycles of bending. The patterned PEDOT layers were applied to dye-sensitized solar cells (DSSCs) as a transparent conductive oxide (TCO)-free counter electrode. An N719-based DSSC with a DPDOT film recorded a photoconversion efficiency of 7.54%, which is one of the highest values among the TCO-free DSSCs based on a PEDOT counter electrode.
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Affiliation(s)
- Chihyun Park
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea
| | - Jongbeom Na
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea
| | - Eunkyoung Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea
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Park C, Na J, Han M, Kim E. Transparent Electrochemical Gratings from a Patterned Bistable Silver Mirror. ACS NANO 2017; 11:6977-6984. [PMID: 28618217 DOI: 10.1021/acsnano.7b02294] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Silver mirror patterns were formed reversibly on a polystyrene (PS)-patterned electrode to produce gratings through the electrochemical reduction of silver ions. The electrochemical gratings exhibited high transparency (T > 95%), similar to a see-through window, by matching the refractive index of the grating pattern with the surrounding medium. The gratings switch to a diffractive state upon the formation of a mirror pattern (T < 5%) with a high diffraction efficiency up to 40%, providing reversible diffractive gratings. The diffraction state was maintained in the voltage-off state (V-off) for 40 min, which demonstrated bistable reversible electrochemical grating (BREG) behavior. By carefully combining the BREGs through period matching, dual-color switching was achieved within the full color region, which exhibited three distinct optical switching states between -2.5, 0, and +2.5 V. The wide range of light tenability using the metallic BREGs developed herein enabled IR modulation, NIR light reflection, and on-demand heat transfer.
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Affiliation(s)
- Chihyun Park
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Jongbeom Na
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Minsu Han
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Eunkyoung Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
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Neo WT, Li X, Chua SJ, Ling Chong KS, Xu J. Enhancing the electrochromic performance of conjugated polymers using thermal nanoimprint lithography. RSC Adv 2017. [DOI: 10.1039/c7ra08850g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thermal nanoimprinting is employed to create nanopatterned electrochromic conjugated polymer films, giving superior color-changing properties compared to a reference device.
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Affiliation(s)
- Wei Teng Neo
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- NUS Graduate School for Integrative Sciences and Engineering
- National University of Singapore
| | - Xue Li
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
| | - Soo-Jin Chua
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Department of Electrical and Computer Engineering
- National University of Singapore
| | - Karen Siew Ling Chong
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
| | - Jianwei Xu
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Department of Chemistry
- National University of Singapore
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Park C, Seo S, Shin H, Sarwade BD, Na J, Kim E. Switchable silver mirrors with long memory effects. Chem Sci 2015; 6:596-602. [PMID: 28936310 PMCID: PMC5588729 DOI: 10.1039/c4sc01912a] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 09/19/2014] [Indexed: 11/30/2022] Open
Abstract
An electrochemically stable and bistable switchable mirror was achieved for the first time by introducing (1) a thiol-modified indium tin oxide (ITO) electrode for the stabilization of the metallic film and (2) ionic liquids as an anion-blocking layer, to achieve a long memory effect. The growth of the metallic film was denser and faster at the thiol-modified ITO electrode than at a bare ITO electrode. The electrochemical stability of the metallic film on the thiol-modified ITO was enhanced, maintaining the metallic state without rupture. In the voltage-off state, the metal film maintained bistability for a long period (>2 h) when ionic liquids were introduced as electrolytes for the switchable mirror. The electrical double layer in the highly viscous ionic liquid electrolyte seemed to effectively form a barrier to the bromide ions, to protect the metal thin film from them when in the voltage-off state.
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Affiliation(s)
- Chihyun Park
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
| | - Seogjae Seo
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
| | - Haijin Shin
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
| | - Bhimrao D Sarwade
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
| | - Jongbeom Na
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
| | - Eunkyoung Kim
- Department of Chemical and Biomolecular Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 120-749 , Korea . ; http://web.yonsei.ac.kr/eunkim/
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Kim B, Shin H, Park T, Lim H, Kim E. NIR-sensitive poly(3,4-ethylenedioxyselenophene) derivatives for transparent photo-thermo-electric converters. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5483-9. [PMID: 23857668 DOI: 10.1002/adma.201301834] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 05/27/2013] [Indexed: 05/23/2023]
Abstract
Electrochromism, photothermal effect, and thermoelectric properties of hexyl-derivatized poly(3,4-ethylenedioxyselenophene) are investigated by precisely controlling the morphology. These properties are clearly demonstrated by controlling the applied electrical potential of the polymer films. Especially, the doped polymer film at -0.1 V reveals the highest photothermal conversion efficiency and a power factor of 42.5% and 354.7 μW m(-1) K(-2) , respectively. Efficient visible to near-infrared absorption, photon to heat, and heat to electric conversion has been realized in one film that could benefit in exploiting multifunctional film displays, invisible NIR sensors, photodynamic theragnosis, and thermoelectric devices.
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Affiliation(s)
- Byeonggwan Kim
- Active Polymer Center for Pattern Integration, Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
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Fabrication of photopolymer hierarchical micronanostructures by coupling electrospinning and photolithography for SERS substrates. Macromol Res 2013. [DOI: 10.1007/s13233-013-1140-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bhuvana T, Kim B, Yang X, Shin H, Kim E. Reversible Full-Color Generation with Patterned Yellow Electrochromic Polymers. Angew Chem Int Ed Engl 2012; 52:1180-4. [DOI: 10.1002/anie.201205206] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 08/21/2012] [Indexed: 11/05/2022]
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Bhuvana T, Kim B, Yang X, Shin H, Kim E. Reversible Full-Color Generation with Patterned Yellow Electrochromic Polymers. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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