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US 10,520,426 B2Granted
Peakforce photothermal-based detection of IR nanoabsorption
AssigneeBruker Nano, Inc.
InventorsGregory O. Andreev, Chanmin Su
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Abstract
An apparatus and method of performing photothermal chemical nanoidentification of a sample includes positioning a tip of a probe at a region of interest of the sample, with the tip-sample separation being less than about 10 nm. Then, IR electromagnetic energy having a selected frequency, ω, is directed towards the tip. Using PFT mode AFM operation, absorption of the energy at the region of interest is identified. Calorimetry may also be performed with the photothermal PFT system.
Claims12
A method of photo thermal nanocalorimetry on a sample using an AFM operating in Peak Force Tapping mode, the method including:
- positioning a tip at a region of interest of the sample;
- directing IR electromagnetic energy having a selected frequency, ω, towards the tip;
- determining a mass of the region by obtaining 3D topography data corresponding to the region in response to the directing step;
- and
- determining a ΔT in response to the directing step.
2 more elements
Dependencies are inferred from the claim text.