| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7144011 | Sensors and Actuators B: Chemical | 2016 | 7 Pages |
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 â¼2 days sample preparation for ATR-FTIR. Resonator dimensions play an important role in NAM-IR, a relationship which will be elaborated here.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Alina J. Andersen, Shoko Yamada, E.K. Pramodkumar, Thomas L. Andresen, Anja Boisen, Silvan Schmid,