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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Carbon Nano-Onion-Based Twin mode ‘Turn-On/Off’ Sensor Array for Perilous Organic Solvents

2019년 8월 29일 10시 31분 38초
INOR.P-117 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Inorganic Chemistry
저자 및
Younghu Son, Gyungse Park1,*, Minyoung Yoon2,*
Nanochemistry, Gachon University Global Campus, Korea
1Department of Chemistry, Kunsan National University, Korea
2Department of Chemistry, Kyungpook National University, Korea
Nowadays, the sensing of volatile organic solvents (VOCs) is very crucial for monitoring air quality, water safety, and other environmental applications. Conventionally, various analytical techniques including gas chromatography, mass spectrometry, high-pressure liquid chromatography have been reported to detect VOCs, although most of the techniques are highly time-consuming and expensive. Here, we reported a novel and cost-effective strategy for the green synthesis of carbon nano onion (CNOs) from the waste part (endocarp) of mango seed, and we used as an electrode material as well as fluorescent material for the sensing of highly toxic volatile organic solvents (VOCs). The carbon nano onion (CNOs) were prepared by a simple solvent-free hydrothermal method at the temperature of 170 °C. The synthesized CNOs showed blue fluorescent and were in a size range of 25 – 32 nm with interlayer spacing 0.27 nm. The designed sensor exhibits highly efficient and rapid dual-mode ('turn on' and 'turn off') fluorescent detection as well as electrochemical detection of DIPA and dioxane. Markedly, this ultra-low sensing achieved from the hydrogen bonding between the surface functional group in CNOs and hosted amine and dioxane. This observation supported by the visual detection of DIPA in an aqueous medium. The calculated limit of detection (LOD) for DIPA was in ultra-low level (0.369 pM). Besides, the electrochemical oxidation of DIPA involves the transfer of an electron from amine to the CNOs modified electrode-electrolyte interface. The sensitivity of DIPA in electrochemical sensing found to be 2.35 nM. Credibly, DIPA, and dioxane considered as a toxic chemical and detected with high sensitivity, portraying this CNOs as a potential sensor for environmental application.