Synthesis of Optically Active ZnS鈥揅arbon Nanotube Nanocomposites in Supercritical Carbon Dioxide via a Single Source Diethyldithiocarbamate Precursor

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• 作者：Michael J. Casciato ; Galit Levitin ; Dennis W. Hess ; Martha A. Grover
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：51
• 期：36
• 页码：11710-11716
• 全文大小：345K
• 年卷期：v.51,no.36(September 12, 2012)
• ISSN：1520-5045

文摘

Zinc sulfide nanoparticles (ZnS NPs) have been deposited on carbon nanotubes (CNTs) from a single source precursor, zinc(II) bis(diethyldithiocarbamate), using a one-step batch supercritical carbon dioxide (sc-CO₂) process. By eliminating the need for an additional sulfur source while simultaneously employing CO₂ as the solvent, this method replaces environmentally unfriendly chemicals commonly used in ZnS鈥揅NT nanocomposite synthesis such as ethylene glycol, thiourea, and hydrogen sulfide. ZnS NP morphology displayed large clusters (209 卤 24 nm) that were comprised of smaller particles (16.9 卤 1.9 nm). Photoluminescence spectroscopy demonstrated broad band fluorescence of the ZnS鈥揅NT nanocomposite at 440 nm (2.82 eV) and fluorescence of a Mn doped ZnS鈥揅NT nanocomposite at 445 nm (2.79 eV) and 602 nm (2.07 eV), also in agreement with previous studies. The ZnS鈥揅NT nanocomposite was compared to ZnS NPs synthesized in the absence of a substrate; results indicated that the ZnS鈥揅NT nanocomposite was formed by a heterogeneous reaction mechanism in the sc-CO₂ system.