Zein powder (CAS: 9010-66-6), absolute ethanol, and acetic acid were all purchased from Sigma-Aldrich® (Taufkirchen, Germany). AISI 316L stainless steel (addressed 316L SS in this article) foil of ~1 mm thickness was used to prepare substrates. The composition of 316L SS was Ni-14.15, Cr-17.75, Mo-2.72, Mn-1.87, Si-0.58, P-0.015, S-0.008, C-0.025, Fe-balance (wt.%). Ag-Sr doped MBGNs were synthesized via a modified Stöber process; the details are given in our previous work [23 (link)].
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