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Published on: September 27, 2011
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Surface-Enhanced Infrared Absorption on Arranged Pt Nanoantennas
Shunsuke Tanaka1,2, Kota Maeki1, Jun Yoshinobu1
1The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
Summary
Platinum nanoantennas exhibit surface plasmon responses, enabling enhanced infrared absorption for chemical reactions. This research advances catalytic technologies by using plasmonics to selectively excite molecular vibrations.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Surface plasmon-driven reactions offer potential for targeted chemical processes.
- Integrating plasmonics with heterogeneous catalysis requires chemically active metals like platinum (Pt).
Purpose of the Study:
- To fabricate and characterize Pt nanoantennas for surface plasmon resonance (SPR) studies.
- To investigate the potential of Pt nanoantennas for surface-enhanced infrared absorption (SEIRA) spectroscopy.
Main Methods:
- Fabrication of Pt nanoantennas on a silicon substrate.
- Infrared transmission absorption measurements to analyze SPR.
- Adsorption of benzene molecules to measure SEIRA spectra.
Main Results:
- Observed transmission absorption bands attributed to SPR in Pt nanoantennas.
- Resonance energy decreased and linewidth narrowed with increasing nanoantenna length, similar to gold (Au) nanoantennas.
- Achieved a surface-enhancement factor of approximately 900 for the C-C stretching mode of benzene.
Conclusions:
- Pt nanoantennas exhibit SPR and electric field enhancement in the infrared region.
- Demonstrated the potential of Pt nanoantennas for SEIRA spectroscopy.
- This work is a significant step towards catalytic applications utilizing infrared surface plasmons for selective vibrational mode excitation.
