TY - JOUR
T1 - Nanomechanical IR spectroscopy for fast analysis of liquid-dispersed engineered nanomaterials
AU - Andersen, Alina Joukainen
AU - Yamada, Shoko
AU - Ek, Pramod Kumar
AU - Andresen, Thomas Lars
AU - Boisen, Anja
AU - Schmid, Silvan
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - IR spectroscopy
KW - Nanomechanics
KW - Chemical analysis
KW - Nanomaterials
U2 - 10.1016/j.snb.2016.04.002
DO - 10.1016/j.snb.2016.04.002
M3 - Journal article
SN - 0925-4005
VL - 233
SP - 667
EP - 673
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -