Controllable Fabrication of Nanocrystal-Loaded Photonic Crystals with a Polymerizable Macromonomer via the CCTP Technique

详细信息    查看全文

• 作者：Lili Yan ; Ziyi Yu ; Li Chen ; Caifeng Wang ; Su Chen
• 刊名：Langmuir
• 出版年：2010
• 出版时间：July 6, 2010
• 年：2010
• 卷：26
• 期：13
• 页码：10657-10662
• 全文大小：913K
• 年卷期：v.26,no.13(July 6, 2010)
• ISSN：1520-5827

文摘

We report an alternative strategy for fabricating nanocrystal-loaded photonic crystals with a polymerizable macromonomer via catalytic chain-transfer polymerization (CCTP) in which CoBF acted as a chain-transfer agent (CTAs). First, monodisperse, functionalized PS-co-PMAA microspheres with polystyrene (PS) cores and poly(methacrylic acid) (PMAA) shells were controllably prepared using styrene and the as-prepared PMAA macromonomer by surfactant-free emulsion polymerization. Then Cd_0.4Zn_0.6S nanocrystals capped with as-prepared PMAA macromonomer were synthesized by an in situ growth method. Finally, Cd_0.4Zn_0.6S nanocrystal-loaded PS-co-PMAA microspheres hybrids were obtained through simply mixing an aqueous solution of PS-co-PMAA microspheres with an aqueous solution of Cd_0.4Zn_0.6S nanocrystals in the appropriate proportions; the multianchor −COOH groups on the surface of core−shell PS-co-PMAA microspheres favor incorporation with Cd_0.4Zn_0.6S nanocrystals. Scanning electron microscopy (SEM) images confirm that PS-co-PMAA microspheres are uniformly surrounded by Cd_0.4Zn_0.6S nanocrystals. In addition, discrete electronic and photonic states can be combined both with PS-co-PMAA photonic crystals and fluorescent semiconductor Cd_0.4Zn_0.6S nanocrystals.