室温下原位制备正六边形碘化铅纳米片

In-situ Preparation of Hexagonal Lead Iodide Nanoflakes at Room Temperature

摘要: 室温下，以铅片（Pb）和碘（I₂）为主要反应物，通过简单的浸泡方法原位合成了具有正六边形结构的碘化铅（PbI₂）纳米片.借用X-射线衍射仪（XRD）和扫描电子显微镜（SEM）对所得的样品进行了表征，并研究了实验条件对产物的影响.结果表明：反应时间、碘（I₂）的浓度、反应介质以及反应温度等条件对产物的形貌和尺寸有明显的影响.当I₂浓度为0.026 mol/L、反应时间为10 min、温度为25℃时，可以得到厚度约100 nm、宽度约2~3 μm的正六边形PbI₂纳米片.

Abstract: Lead iodide (PbI₂) nanoflakes with hexagonal structure were in-situ synthesized by taking advantage of a simple soak method with lead foil and elemental iodine as the main raw materials at room temperature. The synthesized samples were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the effects of reaction conditions on the products were studied at the same time. The results showed that the morphologies and dimensions of the as-prepared samples were obviously influenced by the reaction conditions including reaction time, iodine concentration, reaction medium and reaction temperature. The hexagonal PbI₂ nanoflakes with the thickness and size about 100 nm and 2~3 μm were obtained when the concentration of I₂ was 0.026 mol/L, the reaction time was 10 min and the reaction temperature was 25℃, respectively.