Preparation of Cadmium Sulfide Ultrafine Particles Surface-Modified with Thiols in Reverse Micellar Systems and Redispersion in Non-Micellar Solvents
Preparation of Cadmium Sulfide Ultrafine Particles Surface-Modified with Thiols in Reverse Micellar Systems and Redispersion in Non-Micellar Solvents
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反胶束体系硫醇表面改性硫化镉超细颗粒的制备及其在非胶束溶剂中的再分散
DOI：
10.1252/jcej.30.86
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发表时间：
1997
影响因子：
0.8
通讯作者：
I. Komasawa
中科院分区：
文献类型：
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作者：
S. Shiojiri;T. Hirai;I. Komasawa
研究了反胶束体系中原位制备的CdS超微粒子的硫醇表面改性及其在非胶束溶剂中的再分散。当[S2- ]/[Cd 2+ ]比为0.4 <0.9时，由于苯硫酚分子与吸附在CdS颗粒表面的过量Cd 2+离子结合，CdS超微粒子在吡啶中具有良好的再分散性。颗粒再分散比R定义为再分散在非胶束介质中的超细颗粒的吸光度与相同量的原始反胶束溶液中的颗粒的吸光度之比。随着CdS形成后的时间，直到加入苯硫酚的胶束溶液的增加，再分散率到吡啶或CH 2 Cl 2降低。在反胶束溶液中形成的CdS颗粒在570 nm处的发射，在加入苯硫酚之前，这已归因于表面的CdS的硫空位，也迅速下降后，颗粒形成。这一观察结果表明，CdS的表面硫空位发挥了重要的作用，在表面改性的硫醇。在CdS超微粒子的再分散过程中，加入的苯硫酚分子被认为具有两种作用：使反胶束失稳和与由于失稳而从胶束中脱出的粒子表面结合。同时具有配体部分和疏水基团的溶剂分子有利于再分散被苯硫酚覆盖的颗粒。
Surface modification with thiols and redispersion into non-micellar solvents of CdS ultrafine particles prepared in situ in reverse micellar systems have been investigated. An excellent redispersion in pyridine is observed when the CdS ultrafine particles are prepared with 0.4<[S 2- ]/[Cd 2+ ]<0.9 owing to the binding of the added thiophenol molecules to the excess Cd 2+ ions adsorbed to the surface of the CdS particles. The particle redispersion ratio, R, is defined as the ratio of absorbance of ultrafine particles redispersed in non-micellar media to that of particles in the same amount of the original reverse micellar solution. As the time after CdS formation until the addition of thiophenol to the micellar solution increases, the redispersion ratio into either pyridine or CH 2 Cl 2 decreases. The emission at 570 nm of the formed CdS particles in reverse micellar solutions before adding thiophenol, which has been attributed to surface sulfur vacancies of CdS, also decreases rapidly after the particle formation. This observation suggests that the surface sulfur vacancies of CdS play an important role in the surface modification by thiols. In the redispersion process of CdS ultrafine particles, the added thiophenol molecules are considered to have two functions: destabilizing the reverse micelles and binding to the surface of the particles ejected from the micelles owing to destabilization. Solvent molecules with both ligand parts and hydrophobic groups are favorable for redispersing the particles covered with thiophenol.
Tsukasa Torimoto：“4-羟基苯硫酚修饰的 Pbs 微晶的表面结构及其对光致电荷转移的影响。”
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