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Ag nanoparticles with diameter about 50 nm were synthesized in large scale via a modified method reported by Xia et al.1 2.5 g of PVP (Mw = 55000) was dissolved in 200 mL of ethylene glycol before 0.5 g of AgNO3 was added. After the three-neck flask was settled in an oil bath, the mixture was then heated to ~ 130 ¡ãC within 25 min under vigorous stirring and maintained at 130 ¡ãC for 1 h to obtain the Ag nanoparticles. The nanoparticles were isolated by precipitating the solution with acetone (800 mL), followed by centrifugation at 10000 rpm for 3 min, and re-dispersed in 4 mL of ethanol to obtain the 0.05 g (Ag nanoparticles)/mL solution.
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