Fig. 5From: Large-Area, Highly Sensitive SERS Substrates with Silver Nanowire Thin Films Coated by Microliter-Scale Solution ProcessRaman spectral images of a–d cross-AgNW films on the Au surface with different surface concentrations of AgNWs and e–h drop-casted AgNW films on the Au surface with corresponding surface concentrations. Surface concentration of AgNWs on Au substrate: a, e 4.7 μg/cm2, b, f 5.9 μg/cm2, c, g 8.3 μg/cm2, and d, h 10.6 μg/cm2 Back to article page