Theoretical investigation on near-infrared and visible absorption spectra of nanometallic aluminium
with oxide coating in nanoenergetic materials: size and shape effects |
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Authors: | Peng Ya-Jing Zhang Shu-Ping Wang Ying-Hui and Yang Yan-Qiang |
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Institution: | Center for Condensed Matter Science and Technology,
Department of Physics,
Harbin Institute of Technology, Harbin
150001,
China |
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Abstract: | The effects of metal core dimension, oxide shell thickness and
ellipsoid aspect ratio of Al--Alcore-shell nanoparticle, optical
absorption, interband transition, nanoenergetic materialProject supported by
the National Natural Science Foundation of
China (Grant No 20573028).7865, 7830E, 7820DThe effects of metal core dimension, oxide shell thickness and
ellipsoid aspect ratio of Al--Alcore-shell nanoparticle, optical
absorption, interband transition, nanoenergetic materialProject supported by
the National Natural Science Foundation of
China (Grant No 20573028).7865, 7830E, 7820DThe effects of metal core dimension, oxide shell thickness and
ellipsoid aspect ratio of Al--Alcore-shell nanoparticle, optical
absorption, interband transition, nanoenergetic materialProject supported by
the National Natural Science Foundation of
China (Grant No 20573028).7865, 7830E, 7820DThe effects of metal core dimension, oxide shell thickness and
ellipsoid aspect ratio of Al--Al$_{2}$O$_{3}$ core-shell
nanoparticles on the near-infrared and visible absorption spectra of
nanocomposite Al--Al$_{2}$O$_{3}$/nitrocellulose(NC) film are
investigated by numerical calculations. Both the size-dependent
interband transitions and frequency-dependent free electron damping
of the nanometallic aluminium are taken into account in the
calculations. Oxidation effect of nanoaluminium is also analysed. It
is shown that oxidation may enhance but may also reduce the optical
absorption, depending on the excited light energy and initial
dimension of nanoparticle. Metal core size and excited light energy
dominate the absorption characteristic. The absorption ability of
ellipsoidal nanoparticles is larger than that of spheroidal
nanoparticles and increases by the square index as the aspect ratio
increases. These calculations will provide some significant
theoretical guidance for the preparation and laser ignition of
nanoenergetic materials. |
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Keywords: | core-shell nanoparticle optical
absorption interband transition nanoenergetic material |
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