TiO2 sol-gel thin films containing Au and Pt nanoparticles with controlled morphology: optical study and gas sensing properties

Enrico Della Gaspera; Dario Buso; Michael L. Post; Alessandro Martucci

doi:10.1117/12.854544

13 May 2010 TiO₂ sol-gel thin films containing Au and Pt nanoparticles with controlled morphology: optical study and gas sensing properties

Enrico Della Gaspera, Dario Buso, Michael L. Post, Alessandro Martucci

Author Affiliations +

Proceedings Volume 7726, Optical Sensing and Detection; 77260I (2010) https://doi.org/10.1117/12.854544
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Au and Pt nanoparticles are prepared with colloidal techniques in order to achieve high morphological quality, capped with a polymer and then embedded inside a TiO₂ sol-gel matrix, resulting in a homogeneous dispersion of both metal colloids, confirmed by TEM analyses. Refractive index values measured with ellipsometry increase with the annealing temperature, with quite a linear trend, and at the same time the Au surface plasmon resonance peak undergoes a red shift: the refractive index evaluated from the Au plasmon band is slightly lower than the measured value, indicating that the refractive index just around metal particles is different from the average of the matrix, likely because of the polymeric capping agent. Optical gas sensing tests towards CO and H₂ are presented as one of the possible applications of these nanocomposites.

Citation Download Citation

Enrico Della Gaspera, Dario Buso, Michael L. Post, and Alessandro Martucci "TiO₂ sol-gel thin films containing Au and Pt nanoparticles with controlled morphology: optical study and gas sensing properties", Proc. SPIE 7726, Optical Sensing and Detection, 77260I (13 May 2010); https://doi.org/10.1117/12.854544

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