Preparation of zinc-silver nanoparticles (Xerogel).
Solution 1: A 71mg/ml Zn solution, zinc nitrate six hydrate (Zn(NO3)6. H2O (Merck / pure chemical industries, 99.0%), was dissolved in ethanol (C2H5OH, BDH, 99%,) as solvent. A 5ml Ethylene glycol (C2H6O2, BDH, 99.0 %), were added in order to ensure the complete dissolution, and then solution is stirred vigorously for 1 h at 120 °C. Solution 2: a 21mg/ml Ag+ solution was prepared by dissolving silver nitrate (AgNO3), from BDH, 99.0 %) in distilled water (DW) and adding 5ml ethylene glycol. The solution was stirred vigorously for 1 h at 60ºC to obtain a transparent solution. Then solution 1 was added to solution 2, stirred for 1 hour at room temperature, then serve for further analysis.

Preparation of Ag nano particles by NaBH4

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Sodium borohydride (NaBH4, 0.028gm) was dissolved in 10 ml ice-cold DW, and then polyvinyl pyrrolidone (PVP, 0.4 gm) was added as capping agent. Silver nitrate (AgNO3, 0.0214 gm) was dissolved in 10 ml ice-cold DW. Both solutions were mixed and putted on magnetic stirrer at 50-60°C and1500 rpm, for 1 h., then serve for further analysis 15, 16.

Preparation of Ag nanoparticles by glucose

Silver nano particles are synthesized by using glucose as oxidizing and stabilizing agent. The glucose oxidized into gluconic acid in the existence of silver nitrate, and the resultant gluconic acid will caps the silver nanoparticles. The ratio of AgNO3: glucose was 1:0.5, 15, 17.

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