A simple route for making surfactant free lead sulfide (PbS) quantum dots
A simple route for making surfactant free lead sulfide (PbS) quantum dots
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DOI：
10.1016/j.materresbull.2015.01.045
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发表时间：
2015-05
影响因子：
5.4
通讯作者：
F. Alam;Neetesh Kumar;V. Dutta
中科院分区：
文献类型：
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作者：
F. Alam;Neetesh Kumar;V. Dutta
报道了一种高效、经济、省时、适合于大规模制备不含表面活性剂的硫化铅量子点的方法。PbS纳米晶体（NC）首先通过连续喷雾热解（CoSP）技术合成，并且通过使用研钵和研杵的剧烈机械研磨实现解聚成PbS量子点（QD）。以醋酸铅和硫脲为前驱体制备了无表面活性剂的PbS纳米粒子。与合成的PbS NC相比，研磨的NC的XRD峰的加宽清楚地表明PbS的QD的粒度减小。TEM图像还显示研磨的PbS NC在形状上接近球形，具有在4-6 nm范围内的平均直径。光学带隙从0.41 eV到1.47 eV的偏移支持了QD的形成。
An efficient, cost effective and less time consuming method suitable for mass production of surfactant free quantum dots (QDs) of lead sulfide (PbS) is reported. PbS nanocrystals (NCs) are first synthesised by continuous spray pyrolysis (CoSP) technique and de-agglomeration into PbS quantum dots (QDs) is achieved by vigorous mechanical grinding using mortar and pestle. Lead acetate and thiourea were used as the precursor materials for preparation of surfactant free PbS NCs. The broadening in XRD peaks of ground NCs as compared to as synthesized PbS NCs clearly indicated the reduction in particle size to be QDs of PbS. The TEM images also showed that ground PbS NCs were nearly spherical in shape having an average diameter in the range of 4–6 nm. The shift in optical gap from 0.41 eV to 1.47 eV supported the QD formation.