Table 1: The comparison of two substrates (microporous membrane and glass) for Raman signal at 1165 cm−1.

Time (day)Microporous membraneGlass

157695760
252875211
350514664
449454558
544394027
641083982
738053343
836092484
931201280
102800 523
112510<500
122325<500
132008<500
141385<500
15 920<500

Microporous membrane is the porous substrate coated with Ag nanoparticles.
Glass is the glass substrate coated with Ag nanoparticles.