Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Template-Induced Growth of Sputter-Deposited Gold Nanoparticles on Ordered Porous TiO2 Thin Films for Surface-Enhanced Raman Scattering Sensors

Dec 9, 2022, 2:00 PM
3h
Marriott

Marriott

Board: P-056
Poster Material Science Poster Session

Speaker

Suzhe Liang (Technische Universität München)

Description

Ordered porous gold/titanium dioxide (Au/TiO2) hybrid nanostructured films are specifically interesting in large-scale applications using localized surface plasmon resonances (LSPRs) and surface-enhanced Raman scattering (SERS). In this work, we investigate the optical response of sputter-deposited Au/TiO2 nanohybrid thin films with a focus on the plasmonic response and application as molecular sensors. To elucidate the origin of this behavior, we apply in situ grazing-incidence small-angle X-ray scattering (GISAXS) to investigate the growth kinetics of Au on a TiO2 template during sputter deposition. Based on time-resolved GISAXS, the growth characteristics of sputter-deposited Au on TiO2 template with a final effective Au layer thickness around the percolation threshold are described with the well-known four-stage model of nucleation and cluster formation, diffusion-mediated growth, adsorption-mediated growth and grain growth. The Raman intensity of deposited molecules, probed with rhodamine 6G (R6G), depends on the deposited gold thickness. It shows its maximum at the effective Au thickness (δAu) of 3.4 nm. The maximum in SERS intensity is corroborated by the existence and optimal size of hot spots in the narrow space occurring between the sputter-deposited Au clusters, when staying below the percolation threshold.

Primary author

Suzhe Liang (Technische Universität München)

Co-authors

Mr Tianfu Guan (Technische Universität München) Shanshan Yin (Technische Universität München, Physik-Department, LS Funktionelle Materialien, James-Franck-Straße 1, 85748 Garching, Germany) Ms Eva Krois (Technische Universität München) Wei Chen (Shenzhen Technology University (STU)) Christopher Everettt Jonas Drewes (CAU) Dr Thomas Strunskus (CAU) Marc Gensch Mr Jan Rubeck (DESY) Prof. Christoph Haisch (Technische Universität München) Matthias Schwartzkopf (Deutsches Elektronen Synchrotron (DESY), Notkestr. 85 , 22607 Hamburg, Germany) Franz Faupel (CAU) Stephan V. Roth (Deutsches Elektronen Synchrotron (DESY), Notkestr. 85 , 22607 Hamburg, Germany; KTH, Department of Fibre and Polymer Technology, Teknikringen 56-58 , 10044 Stockholm, Sweden) Prof. Ya-jun Cheng (Chinese Academy of Sciences) Peter Müller-Buschbaum (Technische Universität München, Physik-Department, LS Funktionelle Materialien, James-Franck-Straße 1, 85748 Garching, Germany; MLZ, Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany)

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