Size- and Shape-Controlled Synthesis of CdTe and PbTe Nanocrystals Using Tellurium Dioxide as the Tellurium Precursor

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• 作者：Huaibin Shen ; Hongzhe Wang ; Xia Chen ; Jin Zhong Niu ; Weiwei Xu ; Xiao Min Li ; Xin-Dong Jiang ; Zuliang Du ; Lin Song Li
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：August 24, 2010
• 年：2010
• 卷：22
• 期：16
• 页码：4756-4761
• 全文大小：885K
• 年卷期：v.22,no.16(August 24, 2010)
• ISSN：1520-5002

文摘

We have developed a new method for the synthesis of CdTe and PbTe nanocrystals by using TeO₂ with trioctylphosphine oxide as Te precursor. Using this method, uniform-sized CdTe nanocrystals are successfully synthesized without the use of any air-sensitive alkylphosphine. The monodispersity, size, and shape of as-synthesized CdTe nanocrystals are well-controlled using “green” chemicals at elevated temperatures; the photoluminescence emission of CdTe nanocrystals covers a wide range from 510 to 750 nm. Oleic acid has been chosen as the only ligand to achieve controllable synthesis of CdTe nanocrystals with not only different sizes covering from green to red emissions but also different crystal structures (wurtzite and zinc blende) and shapes (including spherical, tetrapod, dendrimer, and flower) by simply adjusting the injection and/or growth temperatures. PbTe nanocrystals with spherical and cubic shapes have also been synthesized successfully with this new tellurium precursor and they can easily self-assemble into two-dimensional ordered structures. Special attention has also been paid to the studies of the new molecular mechanisms involved in the formation of metal telluride nanocrystals.