The effect of cooling rate during hydrothermal synthesis of ZnO nanorods
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- 作者：Raluca Savu ; Rodrigo Parra ; Ednan Joanni ; Boš ; tjan Janč ; ar ; Sayonara A. Eliziá ; rio ; Rorivaldo de Camargo ; Paulo R. Bueno ; José ; A. Varela ; Elson Longo ; Maria A. Zaghete
- 关键词：A1. Crystal morphology ; A2. Growth from solutions ; B1. Nanomaterials ; B2. Semiconducting II– ; VI materials
- 刊名：Journal of Crystal Growth
- 出版年：2009
- 出版时间：1 August 2009
- 年：2009
- 卷：311
- 期：16
- 页码：4102-4108
- 全文大小：563 K
文摘
The hydrothermal method was employed in order to obtain zinc oxide nanorods directly on Si/SiO2/Ti/Zn substrates forming brush-like layers. In the final stages of synthesis, the reaction vessel was naturally cooled or submitted to a quenching process. X-ray diffraction results showed that all the nanostructures grew [0 0 0 1] oriented perpendicular to the substrate. The influence of the cooling process over the morphology and dimensions of the nanorods was studied by scanning electron microscopy. High-resolution transmission electron microscopy images of the quenched samples showed that the zinc oxide (ZnO) crystal surfaces exhibit a thin-layered coating surrounding the crystal with a high degree of defects, as confirmed by Raman spectroscopy results. Photodetectors made from these samples exhibited enhanced UV photoresponses when compared to the ones based on naturally cooled nanorods.