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Thermal stability and Young's modulus of mechanically exfoliated flexible mica
진다운,고영준,공대솔,김현기,하재현,이민백,홍정일,정종훈 한국물리학회 2018 Current Applied Physics Vol.18 No.12
In recent years, mica has been successfully used as a substrate for the growth of flexible epitaxial ferroelectric oxide thin films. Here, we systematically investigated the flexibility of mica in terms of its thickness, repeated bending/unbending, extremely hot/cold conditions, and successive thermal cycling. A 20-μm-thick sheet of mica is flexible even up to the bending radius of 5 mm, and it is durable for 20,000 cycles of up- and down-bending. In addition, the mica shows flexibility at 10 and 773 K, and thermal cycling stability for the temperature variation of ca. 400 K. Compared with the widely used flexible polyimide, mica has a significantly higher Young's modulus (ca. 5.4 GPa) and negligible hysteresis in the force-displacement curve. These results show that mica should be a suitable substrate for piezoelectric energy-harvesting applications of ferroelectric oxide thin films at extremely low and high temperatures.
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Proton-irradiated Pb(Zr0.52Ti0.48)O3 thick films for flexible non-volatile memory applications
이태권,공대솔,진다운,윤신희,양찬호,정종훈 한국물리학회 2019 Current Applied Physics Vol.19 No.6
We investigated the ferroelectricity in proton-irradiated flexible Pb(Zr0.52Ti0.48)O3 (PZT) thick films and their non-volatile memory characteristics. The Ni-Cr metal foil substrate allowed high-quality polycrystalline PZT films with flexible functionality to be fabricated using conventional sol-gel and high-temperature annealing methods. The 10-MeV proton-irradiated PZT film exhibited an almost square polarization−electric field hysteresis curve with saturated (Ps) and remnant (Pr) polarizations of 18.9 and 17.0 μC/cm2, respectively; which are slightly lower than as-grown PZT with Ps=28.7 μC/cm2 and Pr=24.3 μC/cm2. The Pr did not decrease even after 1000 cycles of continuous bending and unbending at a bending radius of 2.14mm and decreased slightly to ∼80% of its initial value after 105 s. Although the Pr decreased to ∼55% after 1010 cycles, the electric polarization remained switchable under positive and negative electric fields. These characteristics suggest that the flexible PZT films could be utilized in non-volatile memory device applications in environments with high doses of proton irradiation, such as those in aeronautics and nuclear power plants.
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김연경,김나운,김동희,진다운,강다연,박진주 한국스포츠융복합정보학회 2021 스포츠융복합정보학회지 Vol.1 No.1
This study is meaningful in suggesting another effect on college students' sports participation by examining whether the level of disability awareness can be fostered through sports morality of college students. To achieve this goal, college students were set as the population, and data were collected and analyzed from 92 people using questionnaires related to sports morality and disability awareness. The results are as follows. First, the external factor of disability awareness and sports morality’manners showed a positive relationship. Second, the external factor of disability awareness showed a positive relationship with the sports morality’ deviation. As a result, it was concluded that sports morality has a positive effect on the external factor of disability awareness, so that the level of disability awareness can be fostered through sports morality. Therefore, if a program that maximizes the participation of university students in sports and can raise the level of sports morality is provided, the level of awareness of the disabled can be improved.
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Young Joon Ko,진다운,Dae Sol Kong,Jong Hoon Jung 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.4
We report the microstructure and the ferroelectric properties of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films grown under various humidity conditions and synthesis times by using a sol-gel method. When the synthesis time under a humid condition was short (approximately 30 min), the moisture in the environment affected only the surface morphology without any loss of ferroelectricity for the P(VDF-TrFE) films. In contrast, when the synthesis time was long (approximately 90 min), the moisture strongly affected the microstructure and the ferroelectric properties of P(VDF-TrFE). The transparent P(VDF-TrFE) film became opaque at high humidity. Scanning electron microscopy revealed numerous pores on the surface of and inside the film. The pores reduced the Young's modulus considerably from 4.15 to 0.97 GPa for the films grown at 20 and 80% relative humidity, respectively. In addition, the ferroelectric hysteresis loop disappeared at humidities above 60%. This work provides upper limits for the humidity and the synthesis time for the growth of high-quality P(VDF-TrFE) films by using a sol-gel method.
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