Synthesis of stable sol of ZnS nanoparticles by heating the mixture of ZnS precipitate and ethylene glycol
Synthesis of stable sol of ZnS nanoparticles by heating the mixture of ZnS precipitate and ethylene glycol
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DOI：
10.1016/j.colsurfa.2010.03.014
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
N. Uekawa;T. Matsumoto;T. Kojima;F. Shiba;K. Kakegawa
中科院分区：
文献类型：
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作者：
N. Uekawa;T. Matsumoto;T. Kojima;F. Shiba;K. Kakegawa
在328 K下加热24 h，形成了ZnS纳米粒子均匀分散的稳定溶胶。根据所得溶胶中ZnS颗粒的TEM图像，平均粒径为3.8nm。通过测量混合溶液的紫外-可见吸收光谱随加热时间的增加而变化来检查形成过程。当加热温度为408 K时，随着加热时间的增加，观察到由于ZnS向更长波长的带隙跃迁而导致的吸收边的移动。这种吸收边的移动表明在加热过程中溶胶中发生了生长过程。另一方面，溶胶中Zn 2+离子浓度的定性分析表明存在ZnS纳米颗粒的溶解过程。因此，ZnS沉淀物与乙二醇混合溶液中的溶解-沉淀过程对形成均匀溶胶起着重要作用。
Heating the mixture of ZnS precipitate and ethylene glycol at 328K for 24h formed a stable sol with homogeneous dispersion of ZnS nanoparticles. According to TEM image of the ZnS particles in the obtained sol, the average particle size was 3.8nm. The formation process was examined by measuring the change in the UV–vis absorption spectra of the mixed solution with increases in the heating time. When the heating temperature was 408K, the shift in the absorption edge due to the band gap transition of ZnS to a longer wavelength was observed with increases in the heating time. This shift of absorption edge indicated that the growth process occurred in the sol during the heating process. On the other hand, the qualitative analysis of the concentration of Zn2+ions in the sol showed the presence of the dissolving process of the ZnS nanoparticles. Therefore, the dissolution–precipitation process in the mixed solution of the ZnS precipitate and ethylene glycol played an important role in the formation of the homogeneous sol.