Showing papers by "Jin Young Oh published in 2019"
TL;DR: A strain-sensitive, stretchable, and autonomously self-healable semiconducting film achieved through blending of a polymer semiconductor and a self- healable elastomer, both of which are dynamically cross-linked by metal coordination are reported.
Abstract: Skin-like sensory devices should be stretchable and self-healable to meet the demands for future electronic skin applications. Despite recent notable advances in skin-inspired electronic materials, it remains challenging to confer these desired functionalities to an active semiconductor. Here, we report a strain-sensitive, stretchable, and autonomously self-healable semiconducting film achieved through blending of a polymer semiconductor and a self-healable elastomer, both of which are dynamically cross-linked by metal coordination. We observed that by controlling the percolation threshold of the polymer semiconductor, the blend film became strain sensitive, with a gauge factor of 5.75 × 105 at 100% strain in a stretchable transistor. The blend film is also highly stretchable (fracture strain, >1300%) and autonomously self-healable at room temperature. We proceed to demonstrate a fully integrated 5 × 5 stretchable active-matrix transistor sensor array capable of detecting strain distribution through surface deformation.
157 citations
TL;DR: This work reviews recent major progress in the development of both electronic materials and devices toward the second skin and concludes with comments on future research directions of the field.
Abstract: Electronic second skin is touted as the next interface to expand applications of electronics for natural and seamless interactions with humans to enable smart health care, the Internet of Things, and even to amplify human sensory abilities. Thus, electronic materials are now being actively investigated to construct "second skin." Accordingly, electronic devices are desirable to have skin-like properties such as stretchability, self-healing ability, biocompatibility, and biodegradability. This work reviews recent major progress in the development of both electronic materials and devices toward the second skin. It is concluded with comments on future research directions of the field.
150 citations
TL;DR: Pd@CdS@ZnO core-shell nanorods (NRs) have been prepared by using novel an easy chemical synthesis process as discussed by the authors, which is attributed to the effective separation of electrons-hole pairs.
20 citations
TL;DR: In this paper, the authors developed a high-performance stretchable thermoelectric generator using multi-dimensional nanocomposites, which improved the electrical conductivity and morphological stability of the active film.
Abstract: Wearable power sources should be stretchable to provide continuous electricity to devices. In spite of significant progress in the field of wearable electronics, the development of stretchable power sources is still challenging. In this study, we developed a high-performance stretchable thermoelectric generator using multi-dimensional nanocomposites. The thermoelectric power of the metal dichalcogenide (TMD) nanosheet-based active film was significantly enhanced by adding highly conducting single wall carbon nanotubes (one-dimensional material) bridging the multi-stacked TMD nanosheets, which improved the electrical conductivity and morphological stability of the active film, thus increasing its thermoelectric power factor (47 μW/K2 m). The wrinkles on the nanocomposite film rendered it geometrically stretchable. The wrinkled nanocomposite showed significantly improved thermoelectric properties and excellent strain resistance because of the slipping of the TMD nanosheets as a lubricant to release the strain applied to the wrinkles during stretching.
16 citations
TL;DR: In this article, a hybrid visible photocatalyst using an organic and inorganic p-n junction is introduced, which is formed by a self-assembled poly (3hexylthiophene) (P3HT) nanomesh (NM) as a p-type semiconductor and a zinc oxide (ZnO) nanorod (NR) as an n type semiconductor for indoor air purification.
12 citations
Patent•
05 Dec 2019TL;DR: In this paper, an organic thin film, an organic sensor, and an electronic device, comprising a semiconductor polymer comprising a ligand capable of performing a metal coordination coupling or already in the metal-coordination coupling, was shown to satisfy both sensing performance and elongation at the same time.
Abstract: The present invention relates to an organic thin film, an organic sensor, and an electronic device, comprising a semiconductor polymer comprising a ligand capable of performing a metal coordination coupling or already in the metal coordination coupling, and an elastic polymer comprising the ligand capable of performing the metal coordination coupling or already in the metal coordination coupling; and the semiconductor polymer and the elastic polymer are dynamically intermolecular coupled by the metal coordination coupling. Therefore, the present invention is capable of satisfying both sensing performance and elongation at the same time.
1 citations
Patent•
07 Aug 2019TL;DR: In this paper, a thin-film transistor array with a gate and an active layer including a semiconductor material and a first elastomer is described, and a gate insulator between the gate and the active layer is introduced.
Abstract: Disclosed are a thin film transistor includes a gate electrode, an active layer including a semiconductor material and a first elastomer, a gate insulator between the gate electrode and the active layer, and a source electrode and a drain electrode electrically connected to the active layer, wherein each of the semiconductor material and the first elastomer has a hydrogen bondable moiety, and the semiconductor material and the first elastomer are subjected to a dynamic intermolecular bonding by a hydrogen bond and a thin film transistor array and an electronic device including the same.