水溶液中Mn^(2+)对硫化锌纳米粒子形貌的调控作用

Influence of Mn^(2+) on the Morphological Control of ZnS Nanoparticles

利用硫代乙酰胺在水溶液中缓慢释放的S2-与Zn2+反应制备了ZnS纳米颗粒,ZnS纳米颗粒沉积吸附在3-磺酸基丙基三甲氧基硅烷自组装单层膜上。实验发现,溶液中添加少量Mn2+,可以显著影响ZnS纳米颗粒的形貌,对ZnS纳米晶的生长方向也有重要影响。EDS和XRD谱证实Mn2+并没有掺杂到纳米颗粒中去。这为纳米粒子形貌的调控提供了新途径。并对ZnS的形成过程进行了探讨,并提出了可能的影响纳米材料形貌的机制。

ZnS nanoparticles on the self-assembled monolayer of 3-sulfopropyhrimethoxylsilane were fabricated by the reaction between ZnSO4 and thioacetamide in aqueous solution. It was found that a compact ZnS nanoparticle film with string-like particles was obtained when the aqueous solution contained only Zn^2＋. Interestingly, the morphology of ZnS nanoparticles changed from the compact film to hemispheres with herringbone-like structure when Mn^2＋ was added into the aqueous solution. XRD and EDS results indicated that the manganese ions were not doped into the ZnS nanopartieles. These experimental results showed that Mn^2＋ played a key role in the morphological control of the ZnS nanopartieles, even though Mn^2＋ ions were absent in the final as-prepared products. The mechanism of the formation of ZnS with Mn^2 ＋ presence was discussed.