Article

Formation of PbSe Nanocrystals: A Growth toward Nanocubes

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, United States
The Journal of Physical Chemistry B (Impact Factor: 3.38). 11/2005; 109(41):19219-22. DOI: 10.1021/jp052573+
Source: PubMed

ABSTRACT In this paper we report an electron microscopic observation of crystal shape development when PbSe nanocrystals were synthesized using a dynamic injection technique at different temperatures in the presence of oleic acid. A two-step evolution mechanism was proposed, indicating that the shape evolution of PbSe nanocrystals is dependent on the growth time, whereas the crystalline size can be tuned by varying the growth temperature under the studied conditions. It also implies that a higher growth rate in the 111 direction compared to that in the 100 direction results in the formation of nanocubes.

1 Follower
 · 
125 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The detailed optical properties of lead selenide (PbSe) quantum rods biosynthesized in marine Aspergillus terreus were apprehended theoretically using ab initio calculations based on the experimental absorption spectrum. These studies indicate that the absorption coefficient of the biosynthesized PbSe quantum rods increases linearly with incident photon energies. The variation of other optical constants like extinction coefficient, refractive index and reflectance was comparable to that of the chemically synthesized counterparts. Further, the high dielectric constant and remarkable fluorescence of the biogenic PbSe quantum rods pronounce their application in opto-electronic devices in the Near Infra-Red and Ultraviolet spectral regime. The biosynthesized PbSe quantum rods were also found to possess appreciable anti-bacterial activity against various gram positive and gram negative bacterial species thus enhancing the relevance of the same for practical utility. Based on these results it can be concluded that biogenic PbSe quantum rods can be envisaged as potential candidates for bio-imaging, bio-sensing and other photo-voltaic applications.
    Journal of Saudi Chemical Society 11/2014; DOI:10.1016/j.jscs.2014.10.008 · 1.29 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Bismuth ferrite BiFeO3 (BFO) powders with various morphologies were successfully prepared via a sol–gel–hydrothermal synthesis process. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. Microspheres and microcubes were obtained as Bi–Fe–glycerol sol was used as precursor, and submicrometer-sized particles could be prepared by using Bi–Fe–glycerol gel. Possible formation mechanism of BFO microcrystals was proposed in this work. Moreover, the results of UV–vis diffuse reflectance spectroscopy reveal that BFO powders can be used as an effective photocatalyst under visible light in addition to its ferroelectric and magnetic applications.
    Journal of Materials Science Materials in Electronics 12/2012; 23(12). DOI:10.1007/s10854-012-0816-4 · 1.97 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this work, Pb(II)N,N-bis(salicylidene)-ethylenediamine; [Pb(salen)]; was applied as lead precursor to synthesis PbSe nanostructures. Besides [Pb(salen)], SeCl4 and reducing agents like N2H4·H2O have been employed for the production of PbSe nanostructures via a solvothermal route at 180 °C for 3 h in propylene glycol. The effect of preparation factors such as temperature, reaction time, and surfactant on the morphology of PbSe nanostructures was investigated. The experimental results indicated that PbSe synthesized at 150 and 210 °C was composed of agglomerated particles. On the other hand, the use of KBH4 as reducing agent led to produce PbSe with higher particle size and agglomeration. The as-prepared PbSe nanostructures were characterized by XRD, SEM, TEM, EDS, and FT-IR.
    Journal of Cluster Science 09/2013; DOI:10.1007/s10876-013-0564-5 · 1.36 Impact Factor

Preview

Download
1 Download
Available from