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

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

来源：Nanoscale, 2012, 4(15): 4702-4706.

DOI：10.1039/c2nr30724c

We report the melting behaviours of ZnO nanowire by heating ZnO-Al2O3 core-shell heterostructures to form Al2O3 nanotubes in an in situ ultrahigh vacuum transmission electron microscope (UHV-TEM). When the ZnO-Al2O3 core-shell nanowire heterostructures were annealed at 600 degrees 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 Al2O3 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).

• 出版日期2012
• 单位清华大学