Sadovnikov Stanislav I, Gusev Aleksandr I
Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences Ekaterinburg 620990 Russia
RSC Adv. 2020 Nov 4;10(66):40171-40179. doi: 10.1039/d0ra07853k. eCollection 2020 Nov 2.
For the first time, colloidal solutions of silver sulfide are synthesized by chemical deposition from solutions of silver nitrate and sodium sulfide in heavy water DO. In the synthesis, sodium citrate was used as a stabilizer. The sizes of AgS quantum dots in colloidal solutions were estimated by dynamic light scattering and transmission electron microscopy. The size of silver sulfide quantum dots in colloidal solutions in heavy water that were prepared from reaction mixtures with different concentrations of reagents is from 3 to 19-20 nm. An increase in the concentration of silver nitrate and a decrease in the concentration of sodium citrate in the initial reaction mixtures lead to a small increase in the size of AgS quantum dots in the synthesized colloidal solutions. Colloidal silver sulfide solutions synthesized using DO heavy water retain the stability and constant size of the nanoparticles after storage for more than 100 days. The calculated exciton diameter for AgS is about 3 nm, and is consistent with experimental observations.
首次通过在重水DO中由硝酸银和硫化钠溶液进行化学沉积来合成硫化银胶体溶液。在合成过程中，使用柠檬酸钠作为稳定剂。通过动态光散射和透射电子显微镜估计胶体溶液中AgS量子点的尺寸。由具有不同试剂浓度的反应混合物制备的重水中胶体溶液中硫化银量子点的尺寸为3至19 - 20纳米。初始反应混合物中硝酸银浓度的增加和柠檬酸钠浓度的降低导致合成胶体溶液中AgS量子点的尺寸略有增加。使用DO重水合成的胶体硫化银溶液在储存100多天后保持纳米颗粒的稳定性和恒定尺寸。计算得出的AgS激子直径约为3纳米，与实验观察结果一致。
