CAJ | 학술논문

以对二甲苯为连续相,水为分散相,聚(氧乙烯)-聚(氧丙烯)-聚(氧乙烯)嵌段聚合物为表面活性剂,制备ZnSe和ZnMnSe量子点.在量子点表面覆盖一层Zn(OH)2使其发生钝化,再加水引起相分离,选择合适的有机溶剂可从反相微乳液中成功分离出上述量子点,分离后的量子点保持荧光特性且量子点荧光有显著增强.经11-巯基十一烷酸表面修饰,分离的量子点可分散在水中形成透明溶液.采用X-射线衍射、透射电镜、动态激光光散射和荧光光度计表征晶体结构、形貌、尺寸分布和荧光特性,讨论了使量子点稳定的表面保护机理.研究结果表明,嵌段聚合物分子吸附在量子点表面,阻碍了其氧化进程,表面钝化可修补晶体部分缺陷,使分离的量子点荧光增强,稳定期达数月之久.
이대이갑분위련속상,수위분산상,취(양을희)-취(양병희)-취(양을희)감단취합물위표면활성제,제비ZnSe화ZnMnSe양자점.재양자점표면복개일층Zn(OH)2사기발생둔화,재가수인기상분리,선택합괄적유궤용제가종반상미유액중성공분리출상술양자점,분리후적양자점보지형광특성차양자점형광유현저증강.경11-구기십일완산표면수식,분리적양자점가분산재수중형성투명용액.채용X-사선연사、투사전경、동태격광광산사화형광광도계표정정체결구、형모、척촌분포화형광특성,토론료사양자점은정적표면보호궤리.연구결과표명,감단취합물분자흡부재양자점표면,조애료기양화진정,표면둔화가수보정체부분결함,사분리적양자점형광증강,은정기체수월지구.
The successful extractions of ZnMnSe as well as ZnSe quantum dots (QDs) from a reverse micelle template were reported. The recovered QDs kept their functionality with distinct enhancement in photoluminescence. After being coated with a possible layer of Zn(OH)2 within the template, the QDs were extracted from the template by adding water to induce phase transition and employing specific organic solvent. Thereafter, the extracted QDs were capped with mercapto-undecanoic acid for dispersion in water to render crystal clear solution. Analytical techniques such as X-ray diffraction, transmission electron microscopy, dynamic light scattering, and fluorometer were employed to characterize the crystal structure, morphology, average particle size, and photoluminescence of the samples. The mechanism of the surface protection towards QDs was investigated and discussed. A mechanism was proposed as block copolymer molecular being adsorbed to the QDs surface that retards the oxidation process of QDs during the extraction. Consequently, the extracted QDs demonstrated invariable photoluminescence and consistent stability for months.