Premium
Textured Tubular Nanoparticle Structures: Precursor‐Templated Synthesis of GaN Sub‐micrometer Sized Tubes
Author(s) -
Ding S.,
Lu P.,
Zheng J.G.,
Yang X. F.,
Zhao F. L.,
Chen J.,
Wu H.,
Wu M. M.
Publication year - 2007
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.200700289
Subject(s) - materials science , transmission electron microscopy , nanoparticle , photoluminescence , scanning electron microscope , chemical engineering , micrometer , thermal decomposition , nanocrystal , calcination , tube furnace , gallium , nanotechnology , raman spectroscopy , diffraction , nanostructure , composite material , optoelectronics , catalysis , optics , metallurgy , biochemistry , chemistry , physics , organic chemistry , engineering
Porous and sub‐micrometer tubes made of textured GaN nanoparticles have been synthesized by an in situ chemical reaction and characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and photoluminescence (PL) and Raman spectroscopies. The in situ reaction involves thermal decomposition and nitridation of 1D gallium oxyhydroxide (GaOOH) at temperatures in the range of 700–900 °C. The 1D shape of the precursor GaOOH is maintained in the resultant GaN tubes. The GaN nanocrystals (estimated to be about 15 nm in size) are found to be highly oriented with respect to each other in the tube structure, with the [110] GaN direction parallel to the tube axis. The growth mechanism of the tube structure has also been studied. β‐Ga 2 O 3 is found to be an intermediate phase between the starting GaOOH precursor and the final GaN product. The growth mechanism involves decomposition of GaOOH, which produces β‐Ga 2 O 3 tubes with hollow interiors, and nitridation of β‐Ga 2 O 3 , which leads to growth of textured GaN nanocrystals. Based on the growth mechanism, tubular structures with either quasi‐circular or rectangular cross section are selectively synthesized by controlling the heating rate and calcination temperature. This in situ chemical reaction method provides a new route for synthesizing 1D hollow nanostructures.