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Al 2 O 3 hollow nanospheres prepared by fluidized bed chemical vapor deposition and further heat treatment
Author(s) -
Zhao Jian,
Liu Malin,
Chang Jiaxing,
Shao Youlin,
Liu Bing,
Liu Rongzheng
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16659
Subject(s) - materials science , chemical vapor deposition , fourier transform infrared spectroscopy , amorphous solid , microstructure , transmission electron microscopy , chemical engineering , pyrolysis , fluidized bed , thermogravimetric analysis , deposition (geology) , nanotechnology , analytical chemistry (journal) , composite material , chemistry , organic chemistry , paleontology , sediment , engineering , biology
Hollow‐structured Al 2 O 3 nanospheres were prepared by chemical vapor deposition (CVD) and further heat‐treatment process. For the CVD process, a unique cooling gas loop was designed in the precursor delivery system and amorphous Al 2 O 3 nanospheres with incomplete pyrolysis intermediated products were obtained in a vertical fluidized bed at 500℃. The microstructure of the nanospheres tended to hollow after subsequent heat treatment at 1300℃ in air. It was found that the obtained Al 2 O 3 hollow nanospheres showed a size of 100‐450 nm in diameter and 20‐80 nm in shell thickness. Transmission electron microscopy (TEM) and X‐ray diffraction (XRD) analysis confirmed that the Al 2 O 3 hollow nanospheres were α‐Al 2 O 3 . The possible formation mechanism was proposed based on the results of the thermal gravimetric (TG) measurement connected with a Fourier transform infrared spectrometry (FTIR). The novel method to prepare Al 2 O 3 hollow nanospheres can inspire ideas for the design and synthesis of other hollow‐structured nanospheres.