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Microfluidic surface-enhanced infrared spectroscopy with semiconductor plasmonics for the fingerprint region

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Abstract

The combination of semiconductor plasmonics with microfluidics allows surface-enhanced infrared spectroscopy of molecules in the flow regime. Exploiting semiconductor plasmonics enables surface-enhanced mid-IR spectroscopy from 4 μm to 20 μm and accesses the so-called molecular fingerprint region from 6.7 μm to 20 μm (1500–500 cm−1). Besides addressing the whole fingerprint region and allowing the identification of molecules by database comparison, the III–V semiconductor material class allows potentially an integration of semiconductor-based IR-sources, IR-detectors and IR-resonators on-chip. Miniaturized plasmonic enhanced microfluidic mid-IR spectrometry has great potential to analyse and identify minute amounts of molecules in the flow regime. This work describes technological processing to combine semiconductor plasmonics and microfluidics. Two proof-of-concept prototypes were experimentally realized and subsequently tested. Measured mid-IR spectra allow to clearly distinguish ethanol and water by their respective IR-absorption characteristics when inserted into the microfluidic flow chamber. Additionally, a semiconductor surface plasmon resonance shift can be observed according to the inserted solvent. Finally, the formation of a self-assembled monolayer under flow conditions is demonstrated by an observable mid-IR surface plasmon resonance shift of 6 ± 1 cm−1 (140 ± 23 nm).

Graphical abstract: Microfluidic surface-enhanced infrared spectroscopy with semiconductor plasmonics for the fingerprint region

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Publication details

The article was received on 27 Aug 2019, accepted on 13 Nov 2019 and first published on 15 Nov 2019


Article type: Paper
DOI: 10.1039/C9RE00350A
React. Chem. Eng., 2020, Advance Article

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    Microfluidic surface-enhanced infrared spectroscopy with semiconductor plasmonics for the fingerprint region

    M. Bomers, B. Charlot, F. Barho, A. Chanuel, A. Mezy, L. Cerutti, F. Gonzalez-Posada and T. Taliercio, React. Chem. Eng., 2020, Advance Article , DOI: 10.1039/C9RE00350A

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