Szymanski Craig, Wu Changfeng, Hooper Joseph, Salazar Mary Alice, Perdomo Alejandro, Dukes Albert, McNeill Jason
Department of Chemistry, Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634, USA.
J Phys Chem B. 2005 May 12;109(18):8543-6. doi: 10.1021/jp051062k.
We have developed a straightforward method for producing a stable, aqueous suspension of hydrophobic, fluorescent pi-conjugated polymer nanoparticles consisting primarily of individual conjugated polymer molecules. Features of the method are the facile preparation, purity, unique optical properties, and small size (approximately 5-10 nm) of the resulting nanoparticles. The results of TEM, scanning force microscopy, and near-field scanning optical microscopy of particles cast from the suspension indicate that the particles are single conjugated polymer molecules. The NSOM results yield estimates of the optical cross-sections of individual conjugated polymer molecules. The UV-vis absorption spectra of the nanoparticle suspensions indicate a reduction in conjugation length attributed to deformations of the polymer backbone. Fluorescence spectra of the aqueous nanoparticle suspensions indicate interactions between segments of the polymer chain and intramolecular energy transfer.
我们已经开发出一种简单的方法来制备稳定的、由主要为单个共轭聚合物分子组成的疏水性荧光π共轭聚合物纳米颗粒的水性悬浮液。该方法的特点是制备简便、纯度高、具有独特的光学性质以及所得纳米颗粒尺寸小（约5 - 10纳米）。从悬浮液中浇铸出的颗粒的透射电子显微镜（TEM）、扫描力显微镜和近场扫描光学显微镜结果表明，这些颗粒是单个共轭聚合物分子。近场扫描光学显微镜（NSOM）结果给出了单个共轭聚合物分子的光学截面估计值。纳米颗粒悬浮液的紫外 - 可见吸收光谱表明，由于聚合物主链的变形，共轭长度有所减小。水性纳米颗粒悬浮液的荧光光谱表明聚合物链段之间存在相互作用以及分子内能量转移。
