Synthesis and physical characteristics of AlOx-coated ZnO nanorod arrays grown in aqueous solution at low temperatures

Chi Sheng Hsiao, San-Yuan Chen*, Syh Yuh Cheng

*Corresponding author for this work

Research output: Contribution to journalArticle


AlOx-ZnO core-shell nanorods arrays have been successfully synthesized by soaking the ZnO nanorods in the sol-gel solution of Al(NO3)3 and NH4OH at room temperature. It was found that both crystal growth and morphology of the AlOx-ZnO core-shell nanorods are strongly influenced by the solution pH value. SEM image shows that the AlOx-ZnO core-shell nanorods can be perpendicularly grown on the ZnOf/Si substrate under the solution only with a pH value of 6-7. High-resolution TEM observation demonstrates that the structure of the AlOx layer is amorphous and the ZnO nanorod core remains single crystal. After annealed at 400 °C in N2 atmosphere, a strong photoluminescence peak corresponding to blue emission (∼450 nm) was detected from the AlOx-ZnO core-shell nanorods that may result from the induced defects due to interaction between AlOx shell and ZnO nanorods.

Original languageEnglish
Pages (from-to)625-628
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number2-3
StatePublished - 1 Feb 2008


  • D. Blue luminescence

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