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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Mechanism of trinitrophenol explosive detection with novel multiple emitting quantum dots coated with amphiphilic conjugated polythiophenes

2019년 2월 13일 11시 32분 32초
ANAL.P-291 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
포스터 분석구두발표
Analytical Chemistry
저자 및
Sarvar Kakhkhorov, Salah Mahmoud Tawfik Ahmed1, Yong-ill Lee1,*
Changwon National University, Uzbekistan
1Department of Chemistry, Changwon National University, Korea
The novel type of multiple emitting CdTe quantum dots (QDs) coated with amphiphilic conjugated polythiophenes has been developed for the determination of the 2,4,6-trinitrophenol (TNP) explosive. Overall, four types of nanohybrids were designed based on the QDs coated with differently charged polythiophenes (cationic, anionic, and nonionic) and thiophene copolymer. The integration of QDs aimed to increase the electron density of polythiophenes which resulted in efficient interaction of the developed nanohybrids with electron-deficient TNP. This was confirmed by considerable fluorescence quenching of the developed sensors when their response to various types of nitroexplosives was studied: nitrophenols and specifically TNP caused the most remarkable fluorescence quenching compared to the other nitroaromatics. Among the developed nanohybrids, positively charged polythiophenes demonstrated the most efficient fluorescence quenching due to the attraction of –OH groups of TNP to the surface of such nanohybrids. The results of time-resolved fluorescence measurements revealed the presence of stating quenching through the formation of ground state electrostatic interactions which excludes the excited state energy transfer with Förster resonance energy transfer (FRET) mechanism and suggests the inner filter effect (IFE) as a reason of fluorescence quenching of the sensors. In addition, the contribution of hydrogen bonding, electrostatic, and π-π interactions formed between TNP and QD nanohybrids resulted in high fluorescence quenching of up to 96% as well as in the detection of ultralow amounts of TNP up to 0.56×10-9 M.