Hydrothermal−Electrochemical Synthesis of ZnO Nanorods

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• 作者：Seong Kyong Park ; Jae Hyoung Park ; Ki Young Ko ; Sungho Yoon ; Kyo Seon Chu ; Woong Kim ; Young Rag Do
• 刊名：Crystal Growth & Design
• 出版年：2009
• 出版时间：August 5, 2009
• 年：2009
• 卷：9
• 期：8
• 页码：3615-3620
• 全文大小：352K
• 年卷期：v.9,no.8(August 5, 2009)
• ISSN：1528-7505

文摘

Vertically aligned ZnO nanorods having high optical quality were prepared by a hydrothermal−electrochemical method. The nanorods were synthesized in a Zn(NO₃)₂ aqueous solution on Si substrates which were coated with a platinum conducting layer and a ZnO seed layer. They possessed a single-crystal wrtzite structure and grew along the c-axis, perpendicular to the substrates. The height and diameter of the ZnO nanorods were up to 4.3 μm and 90−150 nm, respectively. The morphological, structural, and photoluminescence properties of the ZnO nanorods were examined with respect to the growth temperature (120−180 °C) and the presence of NaOH additive. The nanorods synthesized at high temperature (180 °C) exhibited a strong UV emission and a weak defect-related visible emission leading to a UV−visible ratio of 230. This high optical quality was attributed to the increased growth rate of ZnO nanorods (4.3 μm/h) which was caused by the high growth temperature (180 °C). This was based on the fact that the ZnO phase is thermodynamically more favorable than the defect-related Zn(OH)₂ phase at higher temperature. Since the growth temperature was compatible with polymer materials, our synthetic method may provide a promising way for fabricating high performance optoelectronic devices on flexible polymer substrates.