De, Sucheta and De, Goutam (2008) In situ generation of Au nanoparticles in UV-curable refractive index controlled SiO(2)-TiO(2)-PEO hybrid films. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (28). pp. 10378-10384. ISSN 1932-7447

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UV-curable inorganic (SiO(2)-TiO(2))-organic (polyetheylene oxide [PEO]) hybrid films with high refractive index (RI) values were synthesized, and Au nanoparticles were generated in situ inside such hybrid films. The hybrid films and the corresponding Au-doped films were prepared from sols derived from a mixture of silicon, titanium, and organically modified silicon alkoxides and gold chloride following a sol-gel dip-coating method. An equivalent SiO(2)/TiO(2)/PEO/Au molar ratio (nominal) of 27.7:46.1:23.0:3.2 was maintained in the sol. UV treatments of the dried (90 degrees C) films with energies from 5.3 +/- 0.1 to 53.0 +/- 0.5 J cm(-2) resulted in densification with a gradual increase of the RI value up to 1.75. Drying and UV treatments of the corresponding HAuCl(4)-incorporated hybrid films induced generation of An nanoparticles and showed the characteristic Au-plasmon peak. A gradual red-shifting of the Au-plasmon band from 545 to 571 nm was observed with respect to the UV-treatment energies. This red-shifting is initially due to the increase of RI of the film, and in the later stages it is mainly due to the Au-plasmon coupling concurrently with the slight increase of RI values. Transmision electron microscopy of the UV-treated films showed the presence of densely populated Au nanoparticles of mainly 4-5 nm in size inside the hybrid SiO(2)-TiO(2)-PEO film matrix.

Item Type: Article
Subjects: Processing Science
Depositing User: Bula Ghosh
Date Deposited: 17 Jan 2012 10:23
Last Modified: 17 Jan 2012 10:23

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