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Direct thermal oxidization evaporation growth, structure, and optical properties of single-crystalline nanobelts of molybdenum trioxide

Published online by Cambridge University Press:  31 January 2011

W.G. Chu ,
L.N. Zhang ,
H.F. Wang ,
Z.H. Han ,
D. Han ,
Q.Q. Li  and
S.S. Fan
W.G. Chu*
Affiliation:
National Center for Nanoscience and Technology of China, Beijing 100084, People’s Republic of China; and Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084, People’s Republic of China
L.N. Zhang
Affiliation:
Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China; and Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084, People’s Republic of China
H.F. Wang
Affiliation:
National Center for Nanoscience and Technology of China, Beijing 100084, People’s Republic of China
Z.H. Han
Affiliation:
Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084, People’s Republic of China
D. Han
Affiliation:
National Center for Nanoscience and Technology of China, Beijing 100084, People’s Republic of China
Q.Q. Li
Affiliation:
Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084, People’s Republic of China; and Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China
S.S. Fan
Affiliation:
Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China; and Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Single-crystalline nanobelts of molybdenum trioxides were grown by direct thermal oxidization evaporation of metal molybdenum foils. Their structures, defects, and optical properties were investigated via x-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), atomic force microscopy, micro-Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible spectroscopy (UV-VIS). Single-crystalline nanobelts were identified as an orthorhombic structure with an average stoichiometry of MoO3.02analyzed by energy dispersive spectroscopy of x-rays. The length, width, and thickness of a nanobelt were determined to be parallel to the b, c, and aaxis of the MoO3unit cell, respectively. The thickness of the nanobelt increased by integer multiples of 0.5ain a layer-by-layer fashion during growth. A density of dislocations as high as about 1.2 × 1013cm−2was formed, which may be attributed to relaxation of large strains during cooling. A special dislocation configuration was observed by HRTEM, which was well reproduced by image simulations based on the proposed model. The resulting morphology of nanobelts was proposed to be governed by growth kinetics. Micro-Raman and FTIR spectra were successfully analyzed on the basis of vibration of MoO6octahedra. It was found that micro-Raman spectra were quite dependent on the size of the nanobelts. A band gap energy of 3.04 eV derived from UV-VIS measurements was observed to be red shifted relative to the previously reported experimental values, which may be due to the presence of a high density of defects.

Keywords

DefectsNanostructureOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1609 - 1617
Copyright
Copyright © Materials Research Society2007

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