| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | B. 나노 재료(Nano Materials) |
| 제목 | Rapid and Facile Synthesis of High Performance ZAIS - ZnS Core-Shell Fluorescent Nanocrystals by Sonochemistry |
| 초록 | 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). |
| 저자 | Jongjin Jung, Seung Jae Lee, Jayoung Park, Hye Mi Jang, Joung Guy Park |
| 소속 | Korea Research Institute of Chemical Technology |
| 키워드 | Fluorescent nanocrystal; Core-shell; Sonochemistry; Non-toxic |
