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AFM topography AFM-IR absorption

Polyvinyl Acetate ( PVAc )

C-O-C 1236 cm -1 H

CH 2 C O n

O C

CH 3

Nanoscale mapping with chemical sensitivity

Tapping AFM-IR imaging enables mapping of chemical components by tuning a mid-IR laser to material-specific vibrational resonances .

AFM phase AFM-IR absorption

Polystyrol ( PS )

-CH 2

2925cm -1

C H

H C H n

Chemical ID at the Nanoscale

Tapping AFM-IR spectroscopy provides nanoscale chemical identification by sweeping a tunable IR laser and comparing resulting photothermal absorption spectra with conventional IR references .

AFM-IR absorption

ATR - FTIR ATR - FTIR tapping AFM-IR + tapping AFM-IR +

PVAc

PS

750 1000 1250 1500 1750 2000 2250 750 1000 1250 1500 1750 2000 2250 absorption500 absorption500

AFM-IR