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제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Sonochemical Synthesis of High Performance Core-Shell Fluorescent Nanocrystals Containing Non-toxic Silver, Indium, Zinc, Sulfur Components

2013년 8월 29일 16시 58분 00초
INOR.P-226 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 16일 (수요일) 16:00~19:00
저자 및
정종진, 이승재1, 박자영, 장혜미, 박정규2,*
한국화학연구원 나노기술융합연구단, Korea
1연세대학교 화학과, Korea
2한국화학연구원 형광물질연구팀, Korea
ZAIS - (ZnxAgyInz)S2 - fluorescent nanoparticle has been developed to replace II-VI quantum dots (QDs) due to its cadmium free non-toxic nature, and facile synthesis of the nanocrystal library by ultrasonic and combinatorial chemistry. Although ZAIS shows better fluorescence intensity than QD without photoblinking, it is necessary to enhance its brightness and quantum efficiency for the expansion of its uses, from a cell imaging probe to LED and cosmetic dyes. Here, we developed a rapid and facile synthesis method of ZnS shell surrounding ZAIS nanoparticle core through ultrasonic chemistry. After adding zinc and sulfur sources to as-prepared ZAIS core in TOP (trioctylphosphine) and ODE (octadecene) solution mixture, ZnS shell was successfully formed around two different types of ZAIS cores ? ZAIS 57: (Zn0.0Ag0.3In0.7)S2: red and ZAIS 59: (Zn0.2Ag0.1In0.7)S2: green , respectively, following the sonication for 10 minutes with an appropriate power. ZnS shells raise their fluorescence intensity up to five or ten times because the sonochemical shell synthesis prevents a lattice mismatch between core and shell, and interface strain due to increasing thickness of shells. Moreover, the quantum efficiency of ZAIS-ZnS core-shell nanoparticle increases dramatically from 0.13 to 0.81 in chloroform. For the further application as a bioimaging probe and cosmetic dyes, we prepared MPA (merceptopropionic acid) coated ZAIS-ZnS core-shell nanoparticle to make it dispersed in physiological solution. The population of breast cancer cell didn’t change due to the less-toxic nature of ZAIS-ZnS nanoparticles although high concentration of nanoparticles were added (200 μg/ml).