Porphyrin controlled anisotropic and dendritic growth of thalium chloride crystals

Valentinas Snitka 1Ingrida Bruzaite 2Gediminas Seniunas 1Vida Mizariene 1

1. Kaunas University of Technology, Research Center for Microsystems and Nanotechnology (RCMN KTU), Studentu 65 - 203, Kaunas 3031, Lithuania
2. Kaunas University of Technology, Deparment of Inorganic Chemistry, Radvilenu 19, Kaunas LT-50254, Lithuania

Abstract

Fabrication of nano- to microscopic-scale inorganic materials with special size and morphology are of great interest for materials chemistry due to their importance in basic scientific research and potential technological applications. In the past few decades, there has been an increasing number of reports on the synthesis of inorganic crystals, such as rods, wires, plates, tubules,dendrites.Of these shapes, hierarchical dendrites have attracted much attention stimulated by the practical importance related to some fractal growth phenomena. Studies on the shape control of inorganic crystals will to some extent give insights into the crystallization behavior in a nano- or micro-sized scale owing to the traditional lack of understanding of the growth history and shape evolution process. In this work, the morphology of TlCl crystals grown at the liquid-liquid interface between TlSO4 ant HCl solutions was investigated in the presence of various porphyrin molecules. The addition of TPPS porphyrin molecules changed the morphology from spherical to single-crystalline wires with a width of 100-2000 nm. The addition of TPPyP changed morphology of TlCl crystals into branching dendrites. The presence of different porphyrins molecules in the crystallization medium significantly influenced the morphology of the crystals. Crystals of TlCl with elongated rod-type or branching superstructures were nucleated with high aspect ratios depending on porphyrin type was used. The composition ant microstructure of dendrites was investigated by X-ray technique, SEM and AFM. The wires were produced by elongation and stacking of planar TlCl crystals exhibiting {100} faces. The anisotropic growth behavior causing the wire formation is tentatively ascribed to stepwise capping of the specific surfaces of TlCl crystals by porphyrin molecules.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Valentinas Snitka
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-13 21:44
Revised:   2009-06-07 00:44