Nanomechanical IR spectroscopy for fast analysis of liquid-dispersed engineered nanomaterials

Alina Joukainen Andersen, Shoko Yamada, Pramod Kumar Ek, Thomas Lars Andresen, Anja Boisen, Silvan Schmid

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Abstract

The proliferated use of engineered nanomaterials (ENMs), e.g. in nanomedicine, calls for novel techniques allowing for fast and sensitive analysis of minute samples. Here we present nanomechanical IR spectroscopy (NAM-IR) for chemical analysis of picograms of ENMs. ENMs are nebulized directly from dispersion and efficiently collected on nanomechanical string resonators through a non-diffusion limited sampling method. Even very small amounts of sample can convert absorbed IR light into a measurable frequency detuning of the string through photothermal heating. An IR absorption spectrum is thus readily obtained by recording this detuning of the resonator over a range of IR wavelengths. Results recorded using NAM-IR agree well with corresponding results obtained through ATR-FTIR, and remarkably, measurement including sample preparation takes only a few minutes, compared to ∼2 days sample preparation for ATR-FTIR. Resonator dimensions play an important role in NAM-IR, a relationship which will be elaborated here.
Original languageEnglish
JournalSensors and Actuators B: Chemical
Volume233
Pages (from-to)667-673
Number of pages7
ISSN0925-4005
DOIs
Publication statusPublished - 2016

Keywords

  • IR spectroscopy
  • Nanomechanics
  • Chemical analysis
  • Nanomaterials

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