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Photothermal induced resonance (PTIR) spectra identify contaminants in van der Waals heterostructures (vdWHs) prepared using ‘dry’ transfer methods. Topography (left) and PTIR spectra (right) obtained at the marked locations on vdWHs assembled by overlapping flakes of hexagonal boron nitride (hBN/hBN) using the (a) PDMS all-dry transfer method and (b) polymer-assisted dry pick-up and transfer method, which employs stamps coated in polycarbonate (PC). Scale bars represent 5 μm.
