Uniform composition film of hydrophilic colloidal gold nanoparticles and hydrophobic carbazole functionalized fluorene trimers for enhanced fluorescence and stability  

作　　者：LIU LinLin XIE ZengQi MA YuGuang 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology [2]State Key Laboratory of Supramolecular Structure and Materials,Jilin University

出　　处：《Chinese Science Bulletin》2013年第22期2741-2746,共6页

基　　金：supported by the National Natural Science Foundation of China(20834006,50873043,91233113);the National Basic Research Program of China(2009CB623605,2013CB834705);Guangdong Natural Science Foundation(S2012030006232);Introduced Innovative R&D Team of Guangdong(201101C0105067115)

摘　　要：Compositing gold nanoparticles into conjugated molecules have been developed to be one of the most important approaches to increase stability, since degradation of conjugated materials is now one of the biggest bottle-necks to be conquered before industrialization application. Big-size colloidal gold nanoparticles with strong surface plasma resonance are designed to composite with conjugated molecules, in order to realize effective fluorescence enhancement and stabilization. The uniform composition film of hydrophilic colloidal gold nanoparticles (particle diameter of 30 nm) and hydrophobic carbazole functionalized fluorene trimers has been obtained by direct mixing of their aqueous and THF solutions, which is determined by AFM. By the comparison of composition based on fluorene trimers with similar structures, we have found that peripheral carbazole group and molecular size of fluorene trimers play an important role in the balance of incompatible solubility, which is regarded as increasing solubility of fluorene trimers in mixed solvent, connecting AuNP and peripheral carbazole groups, and restraining aggregate of gold nanoparticle. This allows facile hydrophilic gold nanoparticle to disperse uniformly in hydrophobic-conjugated host. Our investigations show that fluorescence intensity of composition film is enhanced by 4 folds, and heat treatment (200°C for 4h) for the composition film does not induce the degradation of conjugated backbone without the appearance of low-energy emission band, demonstrating the prominent potency of gold nanoparticles in enhanced fluorescence and stability of conjugated molecules and polymers.Compositing gold nanoparticles into conjugated molecules have been developed to be one of the most important approaches to increase stability, since degradation of conjugated materials is now one of the biggest bottle-necks to be conquered before indus- trialization application. Big-size colloidal gold nanoparticles with strong surface plasma resonance are designed to composite with conjugated molecules, in order to realize effective fluorescence enhancement and stabilization. The uniform composition film of hydrophilic colloidal gold nanoparticles （particle diameter of 30 nm） and hydrophobic carbazole functionalized fluorene t_rimers has been obtained by direct mixing of their aqueous and THF solutions, which is determined by AFM. By the comparison of composition based on fluorene trimers with similar structures, we have found that peripheral carbazole group and molecular size of fluorene trimers play an important role in the balance of incompatible solubility, which is regarded as increasing solubility of fluorene trimers in mixed solvent, connecting AuNP and peripheral carbazole groups, and restraining aggregate of gold nanoparticle. This allows facile hydrophilic gold nanoparticle to disperse uniformly in hydrophobic n-conjugated host. Our investigations show that fluorescence intensity of composition film is enhanced by 4 folds, and heat treatment （200℃ for 4 h） for the composition film does not induce the degradation of conjugated backbone without the appearance of low-energy emission band, demonstrating the promi- nent potency of gold nanoparticles in enhanced fluorescence and stability of conjugated molecules and polymers.

关 键 词：金纳米粒子 亲水性胶体 荧光增强 均匀分散 三聚体 稳定性 薄膜 咔唑 

分 类 号：TB383.2[一般工业技术—材料科学与工程]