Transparent Molecular Adhesive Enabling Mechanically Stable ITO Thin Films
| Autor: | Joohoon Kang, Han-Ki Kim, Jihyun Kim, Hae-Jun Seok, Yun Ah Kim, Shingyu Bok, Byungkwon Lim, Jin-Hyeok Park |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ACS Applied Materials & Interfaces. 13:3463-3470 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c20582 |
| Popis: | With rapid advances in flexible electronics, transparent conductive electrodes (TCEs) have also been significantly developed as alternatives to the conventional indium tin oxide (ITO)-based material systems that exhibit low mechanical flexibility. Nanomaterial-based alternating materials, such as graphene, nanowire, and nanomesh, exhibit remarkable properties for TCE-based applications, such as high electrical conductivity, high optical transparency, and high mechanical stability. However, these nanomaterial-based systems lack scalability, which is a key requirement for practical applications, and exhibit a size-dependent property variation and inhomogeneous surface uniformity that limit reliable properties over a large area. Here, we exploited a conventional ITO-based material platform; however, we incorporated a transparent molecular adhesive, 4-aminopyridine (4-AP), to improve mechanical flexibility. While the presence of 4-AP barely affected optical transmittance and sheet resistance, it improved interfacial adhesion between the substrate and ITO as well as formed a wavy surface, which could improve the mechanical flexibility. Under various mechanical tests, ITO/4-AP/poly(ethylene terephthalate) (PET) exhibited remarkably improved mechanical flexibility as compared with that of ITO/PET. Furthermore, ITO/4-AP/PET was utilized for a flexible Joule heater application having spatial uniformity of heat generation, voltage-dependent temperature control, and mechanical flexibility under repeated bending tests. This molecular adhesive could overcome the current limitations of material systems for flexible electronics. |
| Databáze: | OpenAIRE |
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