摘要： We report the melting behaviours of ZnO nanowire by heating ZnO-Al 2 O 3 core-shell heterostructures to form Al 2 O 3 nanotubes in an in situ ultrahigh vacuum transmission electron microscope (UHV-TEM). When the ZnO-Al 2 O 3 core-shell nanowire heterostructures were annealed at 600 °C under electron irradiation, the amorphous Al 2 O 3 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 2 O 3 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 Al 2 O 3 nanotubes, which may be applied in drug delivery, biochemistry and resistive switching random access memory (ReRAM). The transformation of ZnO-Al 2 O 3 core-shell nanowire heterostructures into single crystal Al 2 O 3 nanotubes under electron irradiation and annealing has been observed in situ using an UHV-TEM. 出版日期： 2012-07-12 識別號： ISSN: 2040-3364 識別號： EISSN: 2040-3372 識別號： DOI: 10.1039/c2nr30724c
