嵌段聚合物模板合成ZnS纳米粒子及其表征

Synthesis and Characterization of ZnS Nanoparticles Templated by Block Copolymer

以嵌段聚合物羟基化SBS(SBS-OH)为模板,乙酸锌和硫化钠为前驱物,制备了ZnS纳米粒子。采用紫外-可见吸收光谱(UV-Vis)、荧光光谱(PL)、广角X射线衍射(WAXD)及透射电子显微镜(TEM)对ZnS纳米粒子进行了表征。结果表明,SBS-OH可以在ZnS纳米粒子的生长过程中,起到较好的模板作用,随SBS-OH及前驱物浓度增加,UV-Vis光谱的吸收强度及PL光谱的发光强度均有不同程度的提高。WAXD给出小尺寸ZnS纳米粒子的衍射图像。TEM结果表明5 nm左右的单个ZnS纳米粒子可以通过SBS-OH在四氢呋喃-甲醇-水中的自组装过程,形成40 nm左右的复合结构聚集体。

ZnS nanoparticles were synthesized by using poly（styrene-b-butadiene-b-styrene）（SBS-OH） as template and zinc acetate,sodium sulfide as precursors.The obtained ZnS nanoparticles were characterized by UV-Vis absorption spectroscopy,photoluminescence spectroscopy（PL）,electron transmission microscopy（TEM） and wide angle X-ray diffraction（WAXD） measurements.The results show that SBS-OH can act as an good template for the formation of ZnS nanoparticles.The strengths of UV-Vis absorption and PL spectra increase as the concentrations of precursor and SBS-OH increase.WAXD pattern showed a typical pattern for smaller sized ZnS nanocrystals.TEM result shows that about 5 nm single ZnS nanoparticles can form 40 nm nanocomposites through self-assembly of SBS-OH in tetrahydrofuran-methanol-water.