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Panel (a): chemical structure of GO flakes; Panel (b): schematic image of the GO flakes deposited on the Si membrane and the embedded Wheatstone bridge; Panel (c): piezoresistive Wheatstone-bridge circuit; Panel (d): response curve to humidity of the 65 nm thick GO layer deposited on the Si microbridge (black curve) and of the bare Si microbridge (red curve) (adapted from [76], Copyright 2012, with permission from Elsevier, Amsterdam, The Netherlands).
