Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Plasmonics & Nanooptics IV: Materials Science and Chemistry Applications (joint session O/CPP)

O 56.10: Vortrag

Mittwoch, 3. April 2019, 17:15–17:30, H8

Optical Nanoplasmonic CO2 Detection in the Visible by Polyethylenimine — •Pohl Tobias, Sterl Florian, Strohfeldt Nikolai, and Giessen Harald — 4th Physics Institute and Research Center SCOPE, University of Stuttgart, 70569 Stuttgart, Germany

In industrial production and other technologically relevant processes CO2 is a common byproduct that must be monitored to keep up a high efficiency. Most of the currently available CO2 detection systems use an electrical readout. This poses in environments with explosive or flammable gases a major risk of spark ignition. The available optical solutions, which circumvent this risk altogether, rely on the characteristic infrared absorption of CO2. While being very specific this method requires a large sensing volume. In our contribution, we introduce a cheap and compact nano-optical gas detection scheme for CO2 based on a plasmonic perfect absorber structure combined with the polymer polyethylenimine. The polymer acts as the gas sensitive part as it changes its refractive index by absorbing CO2, which is then translated by the absorber to a resonance shift. By tracking the plasmon resonance we studied the time, concentration, and temperature dependence, as well as possibilities to enhance the response and aging effects. Furthermore we will show that this sensing scheme also works with a much simpler setup consisting only of a LED, a photodiode, and appropriate electronics.