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Images showing the contact angles of inks and for comparison, water. Images showing contact angles for (a) water, (b) AuNP ink + 0.5 g PVP and (c) AuNP ink, after drop casting onto printed carbon substrates. The images show contact angles of (a) 135°, (b) 42°, and (c) 6°, respectively, showing improved wetting by the AuNP ink.
