Dispersibility, Stabilization, and Chemical Stability of Ultrathin Tellurium Nanowires in Acetone: Morphology Change, Crystallization, and Transformation into TeO 2 in Different Solvents
Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.Langmuir (Impact Factor: 4.46). 04/2007; 23(6):3409-17. DOI: 10.1021/la063272+
The dispersibility and stabilization of freshly synthesized ultrathin tellurium nanowires with diameters of 4-9 nm using poly(vinyl pyrrolidone) (PVP) as a capping agent can be well controlled through an easy acetone-addition process. Ultrathin Te nanowires synthesized by a hydrothermal method using PVP as a capping agent will aggregate in a water/acetone system, and their aggregation state strongly relies on the volume of water and acetone in this mixed solution. This phenomenon is due to the different solubility of PVP in water and acetone, which has significant influence on the dispersibility and stabilization of the nanowires. The results also demonstrate that the freshly prepared Te nanowires are not stable after being stored for a prolonged time in contact with air, ethanol, and water. Ultrathin Te nanowires can be oxidized easily with various final morphologies, which are core-shell structures in contact with air, amorphous nanoparticles and nanoplatelets in ethanol, and large square flakes in water. The entire conversion process from crystalline Te nanowires to amorphous TeO2 nanoparticles or single-crystal paratellurite (TeO2) at room temperature was carefully studied, implying that tellurium nanowires synthesized by other chemical methods and other nanomaterials after synthesis could also not be stable, and their storage methods require special attention.
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ABSTRACT: Single-crystalline trigonal tellurium (t-Te) nanotubes with sloping cross-section and hexagonal cross-section can be selectively synthesized on a large scale by a simple solvothermal reduction route, using tellurium dioxide (TeO 2) as tellurium source and ethylene glycol (EG) as both a reducing agent and a solvent in the presence of cetyltrimethyl ammonium bromide (CTAB) and cellulose acetate (CA), respectively. The individual Te nanotubes with cylindrical morphology and open ends have outer diameters of 100–500 nm, wall thicknesses of 50–100 nm, and lengths of 150–200 µm. Both kinds of Te nanotubes grow along the  direction and have excellent crystallinity. The optical properties and the stability in ethanol of the t-Te nanotubes with sloping cross section have been investigated.Crystal Growth & Design 05/2008; 8(6). DOI:10.1021/cg701125k · 4.89 Impact Factor
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ABSTRACT: The current report describes the systematic synthesis of single-crystalline alkaline-earth-metal tungstate AWO4 (A = Ca, Sr, Ba) nanorods as well as a series of their crystalline solid−solution analogues Sr1-xCaxWO4 and Ba1-xSrxWO4 (0 < x < 1) with controllable chemical composition and morphology using a modified template-directed methodology under ambient room-temperature conditions. Extensive characterization of the resulting nanorods has been performed using diffraction, X-ray photoelectron spectroscopy, electron microscopy, and optical spectroscopy. The composition-modulated luminescence properties of these alkaline-earth-metal tungstate solid−solution nanorods provide for a fundamental understanding of the intrinsic optical and optoelectronic properties of these systems, suggesting, therefore, the possibility of their rational incorporation into functional nanoscale devices.Chemistry of Materials 08/2008; 20(17). DOI:10.1021/cm800011j · 8.35 Impact Factor
Chapter: Inorganic Nanobelt MaterialsEncyclopedia of Inorganic Chemistry, 03/2009; , ISBN: 9780470862100
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