Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
J Am Chem Soc. 2010 Mar 24;132(11):3909-13. doi: 10.1021/ja9105682.
Monodisperse, high-quality, single-crystal PbSe nanorods were synthesized in a catalyst-free, one-pot reaction using a new phosphine selenide precursor. PbSe nanorods were assembled to provide liquid-crystalline alignment or vertical alignment under controlled evaporation conditions. The growth of nanorods was monitored by TEM and absorption spectroscopy, indicating that oriented attachment could be involved to provide anisotropic PbSe nanostructures. In-plane XRD showed an enhanced (200) peak for PbSe nanorods, indicating the preferred alignment of nanorods on the substrates and their growth along the <100> direction. Absorption and emission spectra, along with lifetime measurements, show the differences between nanoscale PbSe spheres and rods.
在无催化剂、一锅反应的条件下，使用一种新型的膦硒化物前体制备出单分散、高质量的单晶 PbSe 纳米棒。通过控制蒸发条件，将 PbSe 纳米棒组装起来，提供液晶排列或垂直排列。通过 TEM 和吸收光谱监测纳米棒的生长，表明可能涉及取向附生，以提供各向异性的 PbSe 纳米结构。面内 XRD 显示出 PbSe 纳米棒的（200）峰增强，表明纳米棒在衬底上的优先排列以及它们沿 <100>方向的生长。吸收和发射光谱以及寿命测量显示了纳米级 PbSe 球体和棒之间的差异。
