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Preparation by Hydrothermal Techniques in a Tungstosilicate Acid Solution System and Optical Properties of Tellurium Nanotubes
Author(s) -
Zhang Li,
Wang Cong,
Wen Deyun
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900143
Subject(s) - tellurate , tellurium , chemistry , crystallinity , hydrothermal synthesis , hydrothermal circulation , scanning electron microscope , chalcogen , chemical engineering , nanotechnology , inorganic chemistry , organic chemistry , crystallography , materials science , composite material , ion , engineering
Single‐crystalline tellurium nanotubes can be easily synthesised by a simple hydrothermal, economical and green chemical route. The tungstosilicate acid (TSA) serves as not only an effective reducing agent but also a new morphology‐directing agent for tellurium nanotubes from sodium tellurate (Na 2 TeO 3 ) precursor powders. Scanning electron microscopy images show that most of the tellurium nanotubes have sloping cross‐sections and open ends with outer diameters of 100–500 nm, wall thicknesses of 30–100 nm and lengths of 30–50 μm. A few Te nanotubes have hexagonal cross‐sections. Te nanotubes grow along the [001] direction and have excellent crystallinity. The synthetic conditions also investigated for the tellurium nanotubes were molar ratio of sodium tellurate to TSA, pH of reaction solution and reaction temperature. The optical properties of the t ‐Te nanotubes have been investigated. A possible mechanism for the growth of tellurium nanotubes has been discussed.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)