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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Semiconductor electrochemistry: Application to ultrasensitive acetone gas sensor.

2020년 9월 17일 15시 01분 40초
ELEC.O-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
화 09시 : 45분
Electrochemistry - Oral Presentation of Young Scholars in Electrochemistry
저자 및
Ahyeon Ma, Ki Min Nam*
Department of Chemistry, Pusan National University, Korea

Semiconducting metal oxides are known for years as efficient gas sensing elements, since their electrical conductivity varies greatly with the changes in surrounding gas atmosphere. The development of sensing materials with high sensitivity and selectivity, which influence the practical gas-sensing performance, is critically important for the further evolution of semiconducting metal-oxide gas sensors. Herein, a nanoscale sensing material was prepared in a facile manner via the phase transition of wurtzite CoO to spinel Co3O4, as a new gas sensor preparation platform. The combination of a h-CoO → β-Co(OH)2 phase transition followed by thermal oxidation led to the spontaneously deposition of Co3O4 on the interdigitated electrodes (IDEs). The prepared Co3O4 nanoplates exhibited good contact adhesion with the sensor substrate, which obviated the need for conventional film forming processes, and were shown to be suitable for direct gas sensing. Compared to other Co3O4 sensors, the phase-transitioned Co3O4 nanoplates show very high sensitivity to acetone gas (12.5 for 1 ppm acetone) in the range of 20-1000 ppb at an operating temperature of 200 ℃ and enhanced selectivity. The improved performance of the Co3O4 nanoplates is attributed to typical crystal facets with mainly exposed (111) planes as well as an enlarged surface area during phase transition. Therefore, it was concluded that phase transition methods can be applied to promising sensing substance to develop a variety of related ultrasensitive acetone sensors.