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Citrate-Stabilized 2.6 nm-diameter gold nanoparticles were prepared by sodium citrate reduction of HAuCl4 according to the literature. Briefly, HAuCl4 aqueous solution (1.0 mL, 1% w/v) added into deionized water (100 mL) was remained heating reflux with vigorous stirring. After 10 min later, sodium citrate solution (1.0 mL, 1% w/v) was quickly added under refluxing for one minute, followed by the addition of an ice cold solution of NaBH4 (1.0 mL, 0.075% w/v) in sodium citrate (1% w/v). After an additional 5-30 minutes, the obtained solution was filtered by 0.45¦Ìm membrane filter and used as seeds within 2- 5 h.
Seed-mediated growth
Au seeds aqueous solution (2 mL) mixed with sodium citrate solution (1 mL, 1%) was quickly added to a refluxing solution of HAuCl4 (100mL, 0.01% w/v) under vigorous stirring for 15min. Then, NH2OH•HCl solution (100¦ÌL, 2.78% w/v) was added dropwise and stirred for at least 30 min.
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