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A Thermally Stable, Infrared-Transparent High-Sulfur-Containing Polymer for High Aspect-Ratio Nanostructured MWIR Polarizer

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Small 2025年 e2504090页

作者： Kang, Minjeong Jang, Wontae Lee, Junghyun Kim, Sanghyun Lee, Gyuwon Choi, Keonwoo Kim, Jun Oh Ku, Zahyun Ahn, Junhyoung Lim, Hyungjun Lim, Jeewoo Wie, Jeong Jae Im, Sung Gap Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 South Korea Advanced Instrumentation Institute Korea Research Institute of Standards and Science 267 Gajeong-ro Yuseong-gu Daejeon 34113 South Korea Apex Microdevices 4871 Misrach Ct West Chester 45069 OH United States Department of Nano Manufacturing Technology Korea Institute of Machinery & Materials (KIMM) 156 Gajeongbuk-ro Yuseong-gu Daejeon 34103 South Korea Department of Chemistry and Research Institute for Basic Science Kyung Hee University 26 Kyungheedae-ro Dongdaemun-gu Seoul 02447 South Korea Human-Tech Convergence Program Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul 04763 South Korea Department of Chemical Engineering State University of New York College of Environmental Sciences and Forestry Syracuse NY 13210 United States Graduate school of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 South Korea

Infrared (IR) polarizer is essential for thermal imaging applications such as mobility and military operations. High-sulfur-containing polymers have emerged as promising candidates for IR polarizers due to their mid-wave IR (MWIR) transparency, addressing the limitations of inorganic materials, including their brittleness and high cost. However, poor thermal stability and limited IR range restrict their applicability. This study introduces a glassy IR polarizer based on poly(sulfur-co-hexavinyl disiloxane) (pSHVDS), a highly crosslinked sulfur-rich polymer synthesized via sulfur chemical vapor deposition (sCVD). Self-crosslinking of pSHVDS at high temperatures provided thermal stability during nanoimprint lithography, enabling the fabrication of high-fidelity nano-grating patterns (400 nm pitch, 150 nm width, 300 nm height). The broad transmittance and high aspect ratio of the nanopattern enabled the glassy-pSHVDS MWIR polarizer to achieve over 50% transmittance of transverse magnetic field (T_TM) and an extinction ratio (ER) exceeding 6000 across a broad IR range (3-8 µm). An additional pSHVDS anti-reflection coating further enhanced T_TM to 84% and ER to 7200 at a wavelength of 4 µm, the highest ER reported for organic MWIR polarizers to date. The polarizer maintained its performance after 24 h at 100 °C, demonstrating exceptional thermal stability. These findings underscore the potential of glassy pSHVDS-based polarizers for IR applications. © 2025 Wiley-VCH GmbH.

关键词： bilayer wire grid polarizer high sulfur-content polymer (HSCP) MWIR polarizer sulfur chemical vapor deposition (sCVD) thermal stability

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Visible Light-Sensitive Artificial Photonic Synapse

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ADVANCED OPTICAL MATERIALS 2024年第4期12卷

作者： Jeong, Bum Ho Park, Jaehee Kim, Dohyung Lee, Jongmin Jung, In Hwan Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Hanyang Inst Smart Semicond Seoul 04763 South Korea

Computing based on artificial neuron networks holds great promise in overcoming the von Neumann bottleneck and significantly enhancing computing efficiency. It offers a wide range of possibilities for artificial visual system applications. Photonic synapses, as essential components, can contribute to improved efficiency in visual information processing by leveraging their low latency, high propagation speed, and broad bandwidth capabilities. Herein, a photonic transistor capable of detecting visible light and exhibiting synaptic characteristics under various visible stimuli is presented. This is achieved by integrating a photo-sensitive polymer as a floating gate charge trapping medium. The synaptic device successfully emulates fundamental synaptic behaviors such as excitatory postsynaptic current (EPSC), pair-pulse facilitation, the transition of short-term memory to long-term memory, and learning and forgetting processes. Furthermore, leveraging the ESPC responses, the informative synaptic outputs modulated by light signals enable a non-contact writing method, paving the way for advancements in optical wireless communication. It is believed that this work serves as a promising building block to complete the bio-inspired photonic computing paradigm. A photonic transistor capable of detecting and memorizing visible light signals is demonstrated by integrating a photo-sensitive polymer as a floating gate charge trapping medium. It can emulate fundamental synaptic behavior under various visible stimuli, and the informative synaptic outputs modulated by light signals enable a non-contact writing method, paving the way for advancements in optical wireless ***

关键词： floating gate layer organic field-effect transistors photonic synapse wireless communication

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Strengthening of polyamide 6 and isosorbide-containing copolyester immiscible blends by in-situ reactive compatibilization

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POLYMER 2023年第1期265卷

作者： Jang, Dong Jin Lee, Joo Hyung Lee, Jae Jin Hyun, Jieun Kim, Seong Hun Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Res Inst Ind Sci Seoul 04763 South Korea

Polyamide 6 (PA6) is a representative engineering plastic and is used in various fields due to its impact, chemical, and weather resistance. In industrial applications that require high impact strength, glass-fiber-reinforced PA6 is often used. It is important to note, however, that due to the high hardness of glass fibers, screws and injection molds are very easily worn during extrusion and injection. Poly (ethylene glycol 1,4-cyclohexanedimethylene isosorbide terephthalate) (PEICT) is a copolyester containing isosorbide derived from biomass and has the characteristics of high impact resistance. In this study, PA6 and PEICT blends were prepared by melt processing. A reactive compatibilizer with multifunctional epoxy groups was introduced to reduce the interfacial tension of immiscible PA6 and PEICT. The epoxy groups reacted with the terminal groups of blend components to form branched PA6-co-PEICT copolymers. The copolymers inhibited the aggregation of PEICT and improved the interfacial adhesion between PA6 and PEICT, effectively performing compatibilization. In the successful PA6/ PEICT blend, an impact strength of 29.59 kJ/m2 was achieved, comparable with glass fiber reinforced PA6.

关键词： Polyamide6 (PA6) Poly(14-cyclohexanedimethylene isosorbide terephthalate) (PEICT) Polymer blends In-situ compatibilization Impact strength

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Gradient heating-induced bi-phase synthesis of carbon quantum dots (CQDs) on graphene-coated carbon cloth for efficient photoelectrocatalysis

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CARBON 2022年 196卷 649-662页

作者： Ali, Mumtaz Anjum, Aima Sameen Bibi, Ayesha Wageh, S. Sun, Kyung Chul Jeong, Sung Hoon Natl Text Univ Sch Engn & Technol Dept Text Engn Faisalabad 37610 Pakistan Natl Text Univ Faisalabad Business Sch Faisalabad 37610 Pakistan Women Univ Mardan Dept Biotechnol Mardan 23200 Pakistan King Abdulaziz Univ Fac Sci Dept Phys Jeddah 21589 Saudi Arabia Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Hanyang Inst Energy & Environm Seoul 04763 South Korea

The challenges of secondary pollution and limited stability of metallic catalysts/quantum dots that are used for water treatment must be resolved in the emerging ecofriendly environmental systems. Conversely, carbon ma-terials, specifically, conventional carbon quantum dots (C-CQDs) have emerged as an abundant, stable, and biocompatible alternative for visible-light-driven photocatalysts, that are used for water treatment. Despite these advantages, the fast charge recombination in quantum-confined systems, complex purification, and limited optoelectronic performance are bottlenecks in the practical application of C-CQDs. To address these issues, we proposed a scalable structural design of C-CQDs with enhanced photocatalytic properties. The synthesis process of CQDs was modified to yield a highly amorphous core carbon quantum dots (AC-CQDs), which was controlled by varying the synthesis temperature. The low initial temperature during the synthesis of the AC-CQDs yields an amorphous core, which provides a high electrical resistance;hence, the indirect recombination occurring through core conductivity is significantly suppressed. To ensure scalable synthesis and stability, AC-CQDs were directly grown on reduced graphene oxide, which was coated on a carbon fabric to fabricate a textile-structured electrode. Efficient charge separation in the proposed catalyst electrode structure offers significantly improved photoelectrocatalytic activity, i.e., 100% effluent dye degradation in 25 min.

关键词： Nitrogen -doped carbon quantum dots Temperature effect Dye degradation Photocatalyst and electrocatalyst Graphene modification Textile substrates Metal free catalyst

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Enhanced Static and Dynamic Properties of Highly Miscible Fullerene-Free Green-Selective Organic Photodetectors

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ACS APPLIED MATERIALS & INTERFACES 2021年第21期13卷 25164-25174页

作者： Kang, Jinhyeon Kim, Junho Won, Jong Ho Ahn, Hyungju Kim, Jiho Yoon, Sung Cheol Lim, Eunhee Jung, In Hwan Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Kookmin Univ Dept Chem Seoul 02707 South Korea Hanyang Univ Dept Energy Engn Seoul 04763 South Korea POSTECH Pohang Accelerator Lab Pohang 37673 South Korea Korea Res Inst Chem Technol KRICT Adv Mat Div Daejeon 34114 South Korea Univ Seoul Dept Appl Chem Seoul 02504 South Korea

We developed p-n junction organic photodetectors (OPDs) composed of a polymer donor and a nonfullerene acceptor (NFA) to increase both the responsivity (R) and detectivity (D*) while maintaining a narrow wavelength selectivity. The selection of the polymer donor and NFA with similar green (G) absorption is important for achieving G-wavelength selectivity in these OPDs, which differentiates them from current fullerene-based OPDs and NFA-based panchromatic absorption OPDs. In addition, mixing the polymer donor and asymmetric NFA was efficient toward increasing the miscibility and decreasing the interfacial energy difference of the blended films, resulting in the formation of a uniform and well-mixed nanomorphology in the photoconductive layer. Two-dimensional (2D) grazing incidence X-ray diffraction and Fourier-transform infrared spectroscopy revealed that the lamellar ordering of the polymer donor was enhanced in the blend film prepared with an asymmetric NFA, whereas the aggregation of a symmetric NFA in the blend films did not increase the lamellar ordering of the polymer donor. Consequently, we achieved an R value of 0.31 A/W and D* value of 2.0 x 10(13) Jones with a full width at half-maximum value of 230 nm at -2 V and fast response time of 27 mu s without any external bias in the asymmetric NFA-based OPDs. The enhancement in the lamellar ordering and miscibility of the blended films are crucial toward increasing the static and dynamic properties of OPDs.

关键词： fullerene-free photodetector high responsivity high detectivity green selectivity fast response

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Enhanced interfacial characteristics of perovskite solar cell with multi-functional organic hole-selective interlayer

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DYES AND PIGMENTS 2022年 197卷 109837-109837页

作者： Park, Hansol Kye, Hyojin Jeong, Bum Ho Heo, Jihyeon Hwang, Sooji Kim, Bong-Gi Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Konkuk Univ Dept Organ & Nano Syst Engn Seoul 05029 South Korea

In solution-processed organic and inorganic halide perovskite solar cells (PSCs), managing the interfacial characteristics between multi-layers has been a crucial factor in determining their performance and stability. Here, we newly design an indolocarbazole-based organic molecule that can enhance the interfacial properties between a solution-processed NiOx hole transport layer and perovskite in p-i-n planar PSC. Especially, to be beneficial to this architecture, its visible transparency and energy level are optimized, and its chemical structure is crosslinked for better solution processability as a hole-selective interlayer. More importantly, it can passivate the defects in the perovskite film, consequently enhancing the quality of the film and suppressing non-radiative recombination in the devices. With this interface modification, we confirm that the performance and stability of PSC devices are largely enhanced.

关键词： Perovskite solar cell Interface Defect-passivation Organic hole-selective interlayer Nickel oxide Material design

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Synthesis and characterization of a copper(II) phthalocyanine-based dye for organic photodetectors

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BULLETIN OF THE KOREAN CHEMICAL SOCIETY 2022年第9期43卷 1130-1135页

作者： Kim, Junho Kang, Jinhyeon Jung, In Hwan Hanyang Univ Dept Energy Engn Seoul South Korea Hanyang Univ Dept Organ & Nano Engn 17 Haengdangdong Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 17 Haengdangdong Seoul 04763 South Korea

Novel copper(II) 4,4 ',4 '',4"'-tetra(hexylthienyl)phthalocyanine (CuPc-HT) was synthesized via Stille coupling reaction between 2-trimethylstannyl-5-hexylthiophene and tetra-brominated copper(II) phthalocyanine (CuPc). The incorporation of hexylthiophene to CuPc increased organic solubility, Q-band absorption and p-type characteristics. The bulk heterojunction organic photodetectors (OPDs) were developed by blending CuPc-HT with n-type [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM). CuPc-HT:PC71BM-based devices showed the strong green light detection in the range of 400-600 nm. The measured specific detectivity (D*) was 3.1 x 10(11) Jones under 530 nm light-emitting diode (LED) light of 0.1 mW/cm(2) at -2 V, which was approximately three times higher than those under 680 nm red LED irradiation. Dynamic characteristics of OPDs were investigated, and the -3 cut-off frequency of CuPc-HT:PC71BM devices was extremely high as 0.1 MHz. Notably, the signal response time at -1.0 V was ultrafast to be 9 mu s. Even though CuPc-HT:PC71BM devices showed insufficient static properties, their dynamic characteristics were comparable with those of state-of-the-art OPDs.

关键词： copper(II) phthalocyanine organic photodetector responsivity solution process specific detectivity

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Minimizing ion/electron pathways through ultrathin conformal holey graphene encapsulation in Li- and Mn-rich layered oxide cathodes for high-performance lithium-ion batteries

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JOURNAL OF MATERIALS CHEMISTRY A 2024年第26期12卷 16143-16159页

作者： Kim, Sungwook Hwang, Jeonguk Jo, Youngseok Park, Changyong Bansal, Neetu Salunkhe, Rahul R. Ahn, Heejoon Hanyang Univ Dept Battery Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Indian Inst Technol Dept Phys Mat Res Lab NH-44 Jammu 181221 Jammu & Kashmir India Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea

Graphene encapsulation offers dual benefits of improving the rate capability and cycle stability of lithium- and manganese-rich (LMR) cathode materials in lithium-ion batteries (LIBs). However, conventional graphene wrapping tends to impede lithium ion transport to the cathode particle surface owing to ion migration along the edges of the graphene sheets, thereby limiting the improvement in rate performance. To address this challenge, we developed an innovative ultra-thin conformal holey graphene encapsulation technology for LMR cathodes. This technique involves a two-step coating process utilizing polyethylenimine (PEI) for surface charge control, followed by spontaneous aggregation with holey graphene to create lithium-ion transport channels. The resulting thin (3-5 nm) and uniform coating layer, with minimal carbon content (0.1 wt%), significantly enhances the rate capability by promoting rapid electron movement and lithium-ion diffusion. Additionally, holey graphene encapsulation provides physical protection, addressing issues like micro-crack formation and irreversible phase transitions, thereby improving cycle stability. The performance of the PEI/holey graphene-encapsulated LMR cathode surpassed that of the bare LMR cathode, demonstrating superior capacity retention (87.8% over 100 cycles at 1C), enhanced rate performance (77.8 mA h g-1 at 10C), and improved energy density retention in full-cell tests (72.7% over 300 cycles at 1C). PEI/holey graphene encapsulation applied thinly and uniformly to LMR cathode surfaces enhances electrical conductivity, facilitates lithium-ion diffusion, and acts as a protective layer, demonstrating excellent electrochemical performance.

关键词： Graphene

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Effects of blend composition on the morphologies and physical properties of polycarbonate/acrylonitrile-butadiene-styrene blends

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JOURNAL OF APPLIED POLYMER SCIENCE 2021年第19期138卷 50404-50404页

作者： Seo, Jae Sik Jeon, Ho Tak Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hyundai Motor Co Interior Syst Plast Mat Dev Team Mat Dev Ctr Hwaseong 18280 South Korea Hanyang Univ Human Tech Convergence Program Seoul South Korea

The morphologies and physical properties of twin-screw-extruded polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with various blend ratios are studied. The needle-like co-continuous phase in PC-rich blends changes to the sea-island phase for blend ratios of more than 50 wt% ABS. While pure PC exhibits an almost-Newtonian flow behavior, PC/ABS blends exhibit the interesting rheological transition. The viscosities of the ABS-rich blends at low shear rates are almost equal to those of the pure ABS polymer. The yield stress for the PC/ABS blend ratio of 3:7 is the highest in composition. At the frequency of 10 rad/s, the PC-rich blends exhibit highly viscous properties, whereas the ABS-rich blends present highly elastic properties as the temperature increases. Moreover, the ABS polymer in the PC/ABS polymer blend induces significant change at the fracture surface of PC, transitioning from brittle to ductile nature.

关键词： morphology mechanical properties rheology

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Service chatbot: Co-citation and big data analysis toward a review and research agenda

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techNOLOGICAL FORECASTING AND SOCIAL CHANGE 2023年第1期194卷

作者： Lee, Sae Eun Ju, Naan Lee, Kyu-Hye Hanyang Univ Dept Clothing & Text Human Tech Convergence Program 222 Wangsimni ro Seoul 04763 South Korea Dong A Univ Dept Fash Design 37 Nakdong daero550 Beon gil Pusan 49315 South Korea

This study identified the research trends and intellectual structure of chatbots, through chatbot-related articles to suggest a future research agenda. Systematic literature reviews were performed on 386 articles from the Web of Science database. The intellectual structure investigated major articles and research topics, wherein the research gap and agenda were identified by analyzing keywords. Research on chatbots has been rapidly increasing since 2021, and is being conducted based on the theory of technology adoption. Althrough the bias of chatbots as well as issues related to ethics and security were treated as important topics in newspaper articles, studies were found to be insufficient. As a research variable, there have been many studies verifying the effect of chatbot humanness. However, studies on individual factors and strategies that influence the adoption and proliferation of chatbots are insufficient.

关键词： Retail service chatbot Documentation co-citation analysis Intellectual structure Topic modeling News analysis

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