Jump to main content
Jump to site search

Issue 20, 2019
Previous Article Next Article

TiO2 mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

Author affiliations

Abstract

In this paper, a systematic study regarding the effect of the mesoporous structure over Au nanoparticles (NPs) growth inside and through the pores of mesoporous TiO2 thin films (MTTFs) is presented, and the effect of such characteristics over the composites’ sensing capabilities is evaluated. Highly stable MTTFs with different pore diameters (range: 4–8 nm) and pore arrangements (body- and face-centered cubic) were synthesized and characterized. Au NPs were grown inside the pores, and it was demonstrated—through a careful physicochemical characterization—that the amount of incorporated Au and NP size depends on the pore array; being higher for bigger pore diameters and face-centered cubic structures. The same structure allows the growth of more and longer tips over Au NPs deposited at the thin film–substrate interface. Finally, to confirm the effect of the structural characteristics of the composites over their possible applications, the materials were tested as surface-enhanced Raman scattering (SERS)-based substrates. The composites with a higher amount of Au and more ramified NPs were the ones that presented better sensitivity in the detection of a probe molecule (4-nitrothiophenol). Overall, this work demonstrates that the pore size and ordering in MTTFs determine the materials’ accessibility and connectivity, and therefore, have a clear impact on their potential applications.

Graphical abstract: TiO2 mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

Back to tab navigation

Supplementary files

Article information


Submitted
04 Apr 2019
Accepted
25 Apr 2019
First published
25 Apr 2019

Phys. Chem. Chem. Phys., 2019,21, 10347-10356
Article type
Paper

TiO2 mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

P. Y. Steinberg, M. M. Zalduendo, G. Giménez, G. J. A. A. Soler-Illia and P. C. Angelomé, Phys. Chem. Chem. Phys., 2019, 21, 10347
DOI: 10.1039/C9CP01896D

Social activity

Search articles by author

Spotlight

Advertisements