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Metastable Hexagonal In 2 O 3 Nanofibers Templated from InOOH Nanofibers under Ambient Pressure
Author(s) -
Yu D.,
Yu S.H.,
Zhang S.,
Zuo J.,
Wang D.,
Qian Y.T.
Publication year - 2003
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200304303
Subject(s) - nanofiber , materials science , metastability , nanocrystal , annealing (glass) , chemical engineering , solvent , absorption (acoustics) , nanotechnology , hexagonal phase , ambient pressure , hexagonal crystal system , crystallography , composite material , organic chemistry , chemistry , engineering , physics , thermodynamics
Single‐crystal, metastable, hexagonal In 2 O 3 (H‐In 2 O 3 ) nanofibers with an average diameter of 80 nm and length of up to several micrometers were synthesized on a large scale, for the first time under ambient pressure, by annealing InOOH nanofibers at 490 °C. The InOOH nanofibers were prepared by a controlled hydrolysis solvothermal reaction, using InCl 3 ·4H 2 O as the starting material and ether as the solvent, in the temperature range of 190–240 °C. The solvent has significant effects on the formation of the metastable phase and the morphology of the In 2 O 3 nanocrystals during the synthesis of the precursor InOOH. Room‐temperature optical absorption spectra of the hexagonal In 2 O 3 nanofibers showed strong absorption peak located at 325 nm (3.83 eV) with a slight blue‐shift compared with that of bulk In 2 O 3 (3.75 eV). The H‐In 2 O 3 nanofibers photoluminesce at room temperature with emission peaks at 378 nm, 398 nm, and 420 nm. The successful production of metastable hexagonal In 2 O 3 nanofibers in large scale under mild conditions could be of interest both for applications and fundamental studies.