Abstract
Amino-functionalized mesoporous silica thin films (MTFs) are produced using
surface active agent F127, and then gold nanoparticles are introduced into the pore
channels to prepare the Au/SiO2 nanocomposite. After assembling the gold, the
amino-functionalized MTF undergoes some shrinkage but remains a periodic structure
as demonstrated by X-ray diffraction (XRD) patterns. The nanocomposite shows an
acute characteristic diffraction peak assigned to (111) plane of the
face-centered-cubic structure of gold, indicating that gold nanoparticles
crystallize well and grow in a preferred orientation in the pore channels. The
surface plasma resonance (SPR) absorption peak near 570 nm undergoes a red-shift
accompanied by a strengthening of intensity when HAuCl4 is used to react with the
amino groups on the internal pore surfaces for 4, 6, and 8 h. The simulative results
are consistent with the experimental ones shows that the absorption property of the
Au/SiO2 nanocomposite is influenced by the dipping time, which affects the size and
volume fraction of embedded gold nanoparticles.
© 2011 Chinese Optics Letters
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