Catalytic Growth of Doped ZnO/GeO2 Core−Shell Nanorods

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• 作者：Xinhua Zhang ; Yiqing Chen ; Chong Jia ; Yong Su ; Qiang Li ; Lizhu liu ; Taibo Gou ; Meiqin Wei
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 6, 2009
• 年：2009
• 卷：113
• 期：31
• 页码：13689-13693
• 全文大小：363K
• 年卷期：v.113,no.31(August 6, 2009)
• ISSN：1932-7455

文摘

Bulk-quantity of doped ZnO/GeO₂ core−shell nanostructures have been successfully synthesized by one-step thermal evaporation of a mixed powder of ZnO, In₂O₃, and GeO₂. The results show that the doped ZnO/GeO₂ core−shell nanostructures have a rod-like single-crystalline In-doped ZnO (IZO) core and an amorphous GeO₂ shell. The doped ZnO/GeO₂ core−shell rods can be assembled into the bird’s nest construction by self-assembly. Detailed analyses indicate that the IZO core grows along the <011> direction through a vapor−liquid−solid mechanism, where the In−Ge alloy is used as catalyst for the IZO core under the protection of GeO₂. The photoluminescence spectrum of the sample is composed of two bands, including a weak violet peak centered at 405 nm (3.06 eV) and a strong green emission centered at 510 nm (2.43 eV), which can be attributed to the Ge−O vacancies and the singly ionized oxygen vacancies.