Synthesis and Characterization of PbSe Quantum Wires, Multipods, Quantum Rods, and Cubes

Abstract

Free-standing PbSe nanocrystals, including quantum wires, multipods, quantum rods, quantum dots, and cubes, were produced in a colloidal solution in the presence of alkyl-diamine solvent at 10−117 °C. The morphology of the nanocrystals was governed by a solvent coordinating molecular template mechanism, which was further adjusted by the temperature and duration of the reaction. Crystalline wires with diameters of approximately 20 nm and lengths of 1−5 μm were formed at the lowest temperatures, while quantum rods (with an aspect ratio of ∼5) and cubes (with 100−500 nm edge) were formed at elevated temperatures.

Morphological Transformations and Fusion of PbSe Nanocrystals Studied Using Atomistic Simulations

“…[6][7][8] Single, isolated PbSe NCs display peculiar electronic and optoelectronic properties such as strong quantum confinement, and multiexciton generation. 9 Assemblies made of PbSe nanocrystals feature in IR photon detectors [10][11][12] and in nanocrystal thin-film transistors.…”

“…13 Furthermore, PbSe nanocrystals show a remarkable propensity for crystal unification and have therefore been used as building units for the synthesis of larger nanostructures such as nanorods, nanorings, and nanostars. 3,6,14,15 The process of fusion of (initially) randomly oriented nanocrystals into larger single crystals is commonly referred to as "oriented attachment". 14,16,17 Recently, the mechanism of crystal fusion was observed in real time during in situ heating in a high-resolution transmission electron microscope (HRTEM).…”

Synthesis and Luminescence Properties of EuMoO4 Octahedron-Like Microcrystals

“…Fluorescence spectroscopy can provide valuable information about the intermolecular interactions of molecules in molecular crystals (Lifshitz, et al, 2003). The tetragonal phased EuMoO 4 has similar structure to that of other rare-earth doped molybdate ions with scheelite-type and is expected to be a promising phosphor candidate.…”

Recent Developments in the Synthesis of Metal-Tipped Semiconductor Nanorods

“…[13][14][15][16][17] These parameters play a decisive role in the overall morphology and size dispersity of the nanoparticles ultimately synthesized. To date, semiconductor nanoparticles of a wide variety of different shapes have been reported: rods, 18 tetrapods, 19 stars, 20 cubes, 21 and hyperbranched structures, 22,23 as illustrated in Fig. 1.…”