Formation of α-Fe2O3 Nanoflakes by Heating Fe in Air |
| Journal |
Solid State Phenomena (Volumes 121 - 123) |
| Volume |
Nanoscience and Technology |
| Edited by |
Chunli BAI, Sishen XIE, Xing ZHU |
| Pages |
45-48 |
| DOI |
10.4028/www.scientific.net/SSP.121-123.45 |
| Online since |
March, 2007 |
| Authors |
T. Yu,
C.H. Sow,
X.J. Xu,
Y.W. Zhu,
Chwee Teck Lim,
J.T.L. Thong
|
| Keywords |
Hematite, Hot-Plate, Nanoflakes |
| Abstract |
Flake-shaped hematite (α-Fe2O3) nanostructure has been successfully fabricated by using a
hot-plate to directly heat Fe foil or Fe-coated substrates in air at 300oC. After heating, the surface of
the samples was found to be populated with α-Fe2O3 nanoflakes. Such growth of α-Fe2O3 nanoflakes
was very substrate-friendly. They can be formed on blank Si wafer, patterened Si, AFM tips, silica
sphere, quartz, glass slide, Al foil and electrochemically etched W tip. The formation process and the
final products were investigated by glancing angle x-ray diffraction (GAXRD), micro-Raman,
scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results
indicate the final products are single crystalline α-Fe2O3 nanoflakes vertically standing on the Fe3O4
film that acts as the precursor for growth of α-Fe2O3. The α-Fe2O3 nanoflakes formed by this method
show very sharp tip with the tip radii as small as several nanometers and large surface to volume ratio.
Such nanoflakes may be potentially useful as novel candidates for future electron field emission and
gas senor devices. Furthermore, it is believed that this simple and substrates-friendly method is useful
in extending the applications of α-Fe2O3 nanostructures. |
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