Figure 3.

Photos of silver nanoparticle film. Prepared with different concentrations of silver nanoparticle solution: (a) 1 mM, (b) 10 mM, (c) 50 mM, and (d) 0.1 M.

Zhou et al. Nanoscale Research Letters 2014 9:87   doi:10.1186/1556-276X-9-87
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