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- 저자 : T. Y. Eom(엄태일) (검색결과 1 건)
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T. Y. Eom(엄태일),H. J. Lee(이후정),J. S. Park(박준식) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Various cobalt-based materials, such as cobalt oxide, have been developed as acetone-sensing materials for a diabetes biomarker monitoring. In our previous study, to improve the sensing characteristics of the cobalt-based materials, we developed cobalt fluoride hydroxide (Co(OH)F) material by incorporating fluorine in the crystal structure of the material. In this work, we fabricated p-n junction heterostructured materials consisting of Co(OH)F (p-type) and zinc fluoride hydroxide (Zn(OH)F) (n-type) using a microwave-assisted hydrothermal synthesis process to further enhance the sensing ability of the Co(OH)F. The mixing ratio between Co(OH)F micro-flowers and Zn(OH)F nanorods and temperature were optimized to 3 : 1 and 120℃, respectively. A gas sensor based on the optimized heterostructure material showed a high sensing response of 8.0 toward 5 ppm of acetone gas at 150℃, which is higher than that of the sensor based on pristine Co(OH)F micro-flowers. In addition, the optimized sensor exhibited a low detection limit of 0.25 ppm, good selectivity among other gases, and good long-term stability. The high acetone-sensing response of the sensor could be attributed to the hole/electron transfer between the Co(OH)F micro-flowers and Zn(OH)F nanorods at the interface, which cause the thickness of hole accumulation layer at the Co(OH)F side to grow thicker.
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