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이택성,김나영,이다연,오종규,이근진,김재영,안태규,정용진,김윤희,장재영 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Polymer backbone design suitable for efficient doping can provide new directions for improving charge transport and thermoelectric performance. Herein, a novel diketopyrrolopyrrole (DPP)-based conjugated polymer with eight thiophene groups in a repeating unit, EHT6-20DPP, was synthesized to enhance thermoelectric properties. Due to the extended thiophene groups as electron donating units, EHT6-20DPP shows higher doping efficiency with p-type dopant FeCl<sub>3</sub> compared to other DPP-based polymers with shorten thiophene groups. The electrical conductivity and power factor of the doped EHT6-20DPP reached to maximum 93.28 S/cm and 56.73 μW/mK<sup>2</sup>, respectively. These values were found to be better than the reference DPP-based polymer with three thiophene groups in a repeating unit. A charge transport model was used to demonstrate the relationship between thermoelectric properties, indicating excellent charge transport properties of the doped EHT6-20DPP in terms of polymer backbone engineering.
Development of a Low-Cost Plant Growth Chamber for Improved Phenotyping Research
이택성,Jung Dae-Hyun,김준용,Lee Ju Young,Park Jai-Eok,김형석,정제형,박수현 한국농업기계학회 2023 바이오시스템공학 Vol.48 No.3
Purpose This study aimed to develop a research-use plant growth chamber from which plant researchers can easily acquire data and in which plants can be effectively grown by improving the sealing and control performance of the plant grower. Methods The low-cost plant growth chamber presented in this paper enables control of internal temperature, LED lighting, and aeroponics and features easy remote operation using open-source technology. Furthermore, it can apply a prediction model for the area and fresh weight using canopy images. We also demonstrated that the small enclosed plant grower could provide the opportunity to improve the efficiency and reproducibility of plant growth for various research aims. Results When used in plant-growth tests, the manufactured prototype achieved over 600 μmol m−2 s−1 photosynthetic photon flux densities (PPFD) and internal temperatures satisfying day/night temperature of 21/17 °C, demonstrating its applicability to grow various plants. Moreover, we confirmed that the sensor and image data storage, download functionality, and image analysis operated normally. Conclusion This prototype is advantageous for researchers who have difficulty investing in commercial phenotype equipment and facilitates access to phenotype data processing through a programming approach using canopy images. In the future, as hardware manufacturing costs continue to drop and performance improves, the proposed prototype provides the potential for plant science researchers to utilize creative application programs, systematic experimental design, and shared datasets and code.
Doping and Thermoelectric Behaviors of Donor-Acceptor Polymers with Extended Planar Backbone
이택성,이수빈,최도영,서의현,안태규,정용진,장재영,김윤희 한국고분자학회 2021 Macromolecular Research Vol.29 No.12
The design of a conjugated polymer backbone influences the charge transport and doping efficiency; however, the construction of the polymer backbone for maximized thermoelectric performance is still unclear. Herein, a novel synthesis of a donor-acceptor (D-A) conjugated polymer with an extended planar backbone, C6-ICPDPP, is reported for the investigation of the thermoelectric behavior. The C6- ICPDPP comprises a combination of fused heterocyclic compounds, both electron donor and acceptor groups, which show p-doping characteristics with FeCl3 owing to the excellent planarization. The C6-ICPDPP films are formed from two types of solvents with different boiling points, both of which are doped with FeCl3, showing good thermoelectric properties; however, the thin-film structure, dopant diffusion, and thickness of the C6-ICPDPP films were different between the two solvents. With an increase in the doping concentration of FeCl3, the polarity of the majority charge carriers changes from positive to negative, indicating that the C6-ICPDPP exhibits both p- and n-type electrical behaviors with FeCl3 doping. The optimized power factors are 1.32 μW/mK2 (p-type) and 0.410 μW/mK2 (n-type), respectively, which are consistent with the change in the polaronic features at the given FeCl3 doping concentration. This study provides a design strategy for D-A conjugated polymers with extended planarization and electrical behavior suitable for organic thermoelectrics.
빔의 입사모드가 금 나노입자의 국소표면플라즈몬 산란광에 미치는 영향
이택성,이경석,김원목,이장교,변석주,Lee, Taek-Sung,Lee, Kyeong-Seok,Kim, Won-Mok,Lee, Jang-Kyo,Byun, Seok-Joo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.4
Quantitative analysis of optical scattering intensities from a Au nanoparticle with a diameter of 100 nm, which is effected by the localized surface plasmon resonance (LSPR), were numerically carried out by using a dark-field detection scheme on prism basal plane for two different beam incident modes of reflectance (R-mode) and transmittance (T-mode). Two-dimensional finite difference time domain (FDTD) algorithm was adopted, and its applicabilibility was verified by comparing the simulation results with the theoretical ones. Simulation results of the scattered light intensities from a Au nanoparticle revealed that the scattered intensity of the T-mode was much stronger than that of R-mode. Comparison of the calculated results with the theoretical intensity distribution on the prism showed that the scattered intensity is marimized when the evanescent field, which is generated from the interface of prism and air at TIR angle, is coupled with Au nanoparticle.