基于大分子配体修饰的Cd^(2+)、Mn^(2+)掺杂功能化ZnS纳米晶的制备与表征

Synthesis and characterization of ZnS nanocrystals doped with Cd^(2+) and Mn^(2+) based on the macromonomer ligands

以醋酸锌、氯化镉、醋酸锰和硫化钠为原料,采用末端带双键的聚甲基丙烯酸(PMAA)大分子单体为配体,在水溶液中成功制备出分散均匀并具有良好荧光性的Cd2+和Mn2+掺杂复合的ZnS纳米晶。利用电导率分析、TGA、UV-vis、荧光光谱(PL)等表征手段考察了复合纳米晶结构和光学性能的关系。结果表明,PMAA中的大量羧基是以配位键的形式和纳米晶表面金属原子相结合。通过改变掺入的Cd2+的含量,能够获得从紫外光到可见光范围的ZnS∶Cd2+复合纳米晶材料。

In this paper, we reported the successful synthesis of Cd2＋ or Mn2＋ doped ZnS composite nanocrystals, which employed zinc acetate, cadmium chloride, manganese acetate and sodium sulfide as raw materials, along with poly（methacrylic acid） （PMAA） macromonomer containing unsaturated vinyl end groups as the stabilizing agent. The as-prepared composite nanocrystals with good fluorescent properties were well dispersed in aqueous solutions without any aggregation. The detailed structure and optical properties of these nanocrystals were in- vestigated by conductivity analysis, TGA,UV-Vis and photoluminescenee spectra （PL） measurements. The ex- perimental observations suggest that the formation of coordination bond between nanocrystals and the carboxyl groups of PMAA maeromonomer occurs in this case. It is also noted that we could fabricate a series of optical ZnS ： Cd2＋ composite nanocrystals ranged from ultraviolet region to visible light region by varying the amount of doped Cd2＋ in these composite nanocrystals.