*2.1. Materials*

Silver nitrate (99.9%), R6G (C28 H31 N2O3Cl, 99%) and thiram (C6H12 N2S2, 99.9%) were purchased from Sigma-Aldrich (Darmstdt, Garmany), Ammonia (25% *w*/*w* aqueous solution) and D-glucose were supplied by Beijing Chemical Works (Beijing, China), and SYLGARD 184 Silicone Elastomer Base and SYLGARD 184 Silicone Elastomer Curing Agent were purchased from Dow Corning Corporation (Midland, MI, USA). All the reagents used in this work were of analytical grade. Deionized water (Milli-Q purification system, Millipore Co., Bedford, MA, USA) was used for all experiments.
