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Jeong Jaehoon,Bisht Himani,Ryu Sanghyun,Hong Daewha 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.6
Polymer brush surfaces have various interesting applications; however, to facilitate their formation on surfaces, an initiator ad-layer is required in advance. In this study, we developed a versatile initiator film that simultaneously meets the standards of uniformity and stability using a simple surface coating strategy. In brief, co-deposition of dopamine and polyethyleneimine formed a polydopamine/polyethyleneimine (pDP) film, which was then acylated with external α-bromoisobutyryl bromide. The resultant initiator film, pDP functionalized with initiator (pDPI), showed a homogeneous surface morphology and resisted harsh solvent conditions. The subsequent surface-initiated polymerization from the developed pDPI initiator layer also formed a thick polymer brush.
Jaehoon Jeong,Sungho Nam,Hwajeong Kim,Youngkyoo Kim IEEE 2014 IEEE journal of selected topics in quantum electro Vol.20 No.6
<P>We report inverted-type organic photodetectors with zinc oxide (ZnO) electron-collecting buffer layers and polymer:fullerene bulk heterojunction active layers. A visible light was detected by the inverted organic photodetectors when a background UV light was ON, whereas no photocurrent signal was measured for visible lights without the background UV light. Interestingly, UV lights solely were successfully detected without any surrounding UV light. The present devices exhibited fast and stable photo-responses under modulated or continuous UV-visible lights.</P>
Jeong, Jaehoon,Nam, Sungho,Kim, Joonhyeon,Woo, Sungho,Kim, Hwajeong,Kim, Youngkyoo American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>We investigated the influence of nickel oxide (NiO) nanoparticles that are incorporated into the hole-collecting buffer layer [poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)] on the performance of polymer:fullerene solar cells. To understand the optimum composition of NiO nanoparticles, the composition of NiO nanoparticles was varied from 0 wt% to 23 wt%. Results showed that the optical transmittance was gradually decreased as the NiO content increased. However, the device performance (short circuit current density, fill factor, series resistance, power conversion efficiency) exhibited a two stage trend in a boundary of approximately 9 wt% NiO content. This trend was in good agreement with the trend of sheet resistance in the presence of slight discrepancy owing to the different charge transport geometry.</P>
Vehicle Trajectory-Based Data Forwarding Schemes for Vehicular Ad Hoc Networks
Jaehoon Paul Jeong 한국통신학회 2012 정보와 통신 Vol.29 No.8
This paper introduces three vehicle trajectory-based data forwarding schemes, tailored for vehicular ad hoc networks. Nowadays GPS-based navigation systems are popularly used for providing efficient driving paths for drivers. With the driving paths called vehicle trajectories, we can make data forwarding schemes more efficient, considering the micro-scoped mobility of individual vehicles in road networks as well as the macro-scoped mobility of vehicular traffic statistics. This paper shows why the vehicle trajectory is a key ingredient in the design of the vehicle-to-infrastructure, infrastructureto-vehicle, and vehicle-to-vehicle data forwarding schemes over multihop. Through the mathematical formulation, the key design techniques are shown for three forwarding schemes based on vehicle trajectory, compared with a state-of-the-art data forwarding scheme based on only vehicular traffic statistics.
Jeong, Wonwoo,Kang, Hyeongeun,Kim, Eunseok,Jeong, Jaehoon,Hong, Daewha American Chemical Society 2019 Langmuir Vol.35 No.41
<P>In this study, we developed a uniform initiator layer that can be formed on various surfaces, and formed site-selectively, for the subsequent antifouling polymer brush formation. Initially, metal-organic films composed of tannic acid (TA) and Fe<SUP>III</SUP> ions (TA-Fe<SUP>III</SUP>) were formed on various surfaces, followed by functionalization with an aryl azide-based initiator (ABI) under photoreaction. In particular, combination with a photolithographic technique enabled the presentation of initiators only on the intended region within a single-surface platform. A resultant initiator film (TF-ABI) was formed under mild reaction conditions and meets the uniformity and transparency requirements concurrently. Subsequently, we showed that TF-ABI can be further utilized to form a polymer brush by proceeding with surface-initiated polymerization using a zwitterionic monomer, namely, sulfobetaine acrylamide (SBAA). Instead of applying a classical, yet air-sensitive atom transfer radical polymerization (ATRP) technique, we utilized an activator regenerated by electron transfer (ARGET) ATRP under air conditions without a cumbersome deoxygenation step. Overall, our initiator layer allowed the antifouling poly(SBAA) brush to be used on various surfaces, and enabled their pattern generation.</P> [FIG OMISSION]</BR>