Bi／聚苯乙烯壳-核结构纳米复合物的制备及光学性质研究

Synthesis and optical properties of Bi shell/sulfonate-polystyrene core nanocomposites with hollow structure

利用磺化处理后的聚苯乙烯空心球（S-SPS）作硬模板，采用简单的还原方法，大量制备了具有核,壳结构的Bi／S．SPS纳米复合物。产物采用XRD，SEM，TEM，HRTEM和荧光发射谱（PL）等进行了系统的表征．其中核为空心的有机物S-PS球，壳为无机Bi层，包覆在S-Ps表面上的Bi层厚度为50nm左右,纳米复合物的荧光发射谱相对于聚苯乙烯原料而言，具有明显增强且红移的紫外发射。结果表明半导体Bi粉体在有机物表面的包覆，可以明显增强有机物的荧光发射效率，提出了此核-壳纳米复合物的生长机理。

Bi shell/sulfonate-polystyrene core composite nanospheres with hollow structure have been synthesized by a simple approach using hollow sulfonate polystyrene nanospheres （S-PS） as hard templates. The product has been characterized by XRD, SEM, TEM, HRTEM, FT-IR, UV-Visible and photoluminescence （PL） spectra. The results show that the Bi powders with a thickness of about 120 nm are coated on the surface of S-PS spheres to form hollow Bi shell/S-PS core nanospheres. The PL spectrum of the nanocomposites shows an enhanced and blue-shifted UV emission compared with the bare S-PS. The formation mechanism of such a nanostructure is also discussed.