Synthesis, Optical Spectroscopy and Ultrafast Electron Dynamics of PbS Nanoparticles with Different Surface Capping
Synthesis, Optical Spectroscopy and Ultrafast Electron Dynamics of PbS Nanoparticles with Different Surface Capping
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DOI：
10.1021/jp000639p
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发表时间：
2000-11
影响因子：
3.3
通讯作者：
A. Patel;Fanxin Wu;J. Zhang;C. L. Torres-Martínez;R. Mehra;A. Y. Yang;S. Risbud
中科院分区：
文献类型：
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作者：
A. Patel;Fanxin Wu;J. Zhang;C. L. Torres-Martínez;R. Mehra;A. Y. Yang;S. Risbud
硫化铅，PbS，纳米粒子已经使用许多表面封端剂合成，包括聚（乙烯醇）（PVA），聚（乙烯基吡咯烷酮）PVP，明胶，DNA，聚苯乙烯（PS），和聚（甲基丙烯酸甲酯）（PMMA）。电子吸收光谱和颗粒形状已被发现取决于所使用的封端分子。观察到在580 nm处的激子功能与PVA和DNA的盖帽，而没有观察到这样的激子功能的PVP，PS或PMMA。明胶的激子特征较弱。通过封端剂的控制，颗粒形状从立方体、针状到球形变化。对于DNA覆盖的PbS纳米晶体，HRTEM证明存在直径为3 - 8 nm的椭圆形晶体。PbS-DNA纳米晶体的粉末X射线衍射显示PbS在2.97、3.43和2.10 A处的特征峰。XRD表明纳米颗粒的尺寸为约4 nm。利用该方法测定了PbS纳米粒子的光生电子动力学。
Lead sulfide, PbS, nanoparticles have been synthesized using a number of surface capping agents including poly(vinyl-alcohol) (PVA), poly(vinyl-pyrrolidone) PVP, gelatin, DNA, polystyrene (PS), and poly(methyl-methacrylate) (PMMA). The electronic absorption spectra and particle shapes have been found to depend on the capping molecules used. An excitonic feature at 580 nm was observed for capping with PVA and DNA, while no such excitonic feature was observed for PVP, PS or PMMA. A weak excitonic feature was observed for gelatin. The particle shape varied from cubic, needle to spherical as controlled by the capping agents. For the DNA-capped PbS nanocrystals, HRTEM demonstrated the presence of oval crystals with a diameter of 3−8 nm. Powder X-ray diffraction of the PbS-DNA nanocrystals showed the characteristic peaks for PbS at 2.97, 3.43, and 2.10 A. The XRD suggested the size of the nanoparticles to be approximately 4 nm. The dynamics of photoinduced electrons in PbS nanoparticles have been determined usi...