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Wetting behavior of EGaIn liquid metal on CuNPs/PMMA substrate with spray times of (a) 120 s and (b) 30 s. (c,d) Schematic illustrating the incomplete imbibition-induced wetting of liquid metal on CuNP/PMMA substrates formed at low spray time: (c) CuNPs are immobilized on the substrate, but the coverage is insufficient, preventing the imbibition of EGaIn. (d) CuNPs are not immobilized on the PMMA substrate, resulting in the detachment of the CuNPs.
