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(a) Optical images of the surface of the CuNPs/PMMA substrates with different spray times. (b) Surface coverage of the CuNPs/PMMA depending on the spray time. (c) Cross-sectional SEM image of the CuNPs/PMMA with the spray times of 10 s. The spray distance was fixed at 10 cm, and DCM was used as the solvent of the CuNP dispersion. (d) A schematic diagram of the states of the CuNP film as a function of the two spray parameters of time and distance.
