Direct observation of melting behaviors at the nanoscale under electron beam and heat to form hollow nanostructures

Chun Wei Huang, Cheng Lun Hsin, Chun Wen Wang, Fu Hsuan Chu, Chen Yen Kao, Jui Yuan Chen, Yu Ting Huang, Kuo Chang Lu, Wen Wei Wu, Lih Juann Chen

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We report the melting behaviours of ZnO nanowire by heating ZnO-Al 2O3 core-shell heterostructures to form Al 2O3 nanotubes in an in situ ultrahigh vacuum transmission electron microscope (UHV-TEM). When the ZnO-Al2O3 core-shell nanowire heterostructures were annealed at 600°C under electron irradiation, the amorphous Al2O3 shell became single crystalline and then the ZnO core melted. The average vanishing rate of the ZnO core was measured to be 4.2 nm s-1. The thickness of the Al 2O3 nanotubes can be precisely controlled by the deposition process. Additionally, the inner geometry of nanotubes can be defined by the initial ZnO core. The result shows a promising method to obtain the biocompatible Al2O3 nanotubes, which may be applied in drug delivery, biochemistry and resistive switching random access memory (ReRAM).

Original languageEnglish
Pages (from-to)4702-4706
Number of pages5
JournalNanoscale
Volume4
Issue number15
DOIs
Publication statusPublished - 2012 Aug 7

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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