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´òËãºÏ³É³¤¾¶±È3.5£¬³¤ 54.0 ¡À 2.1 nm ¿í 15.9 ¡À 1nmµÄ½ð°ô£¬²Î¿¼µÄÊÇCatherine J. MurphyÖ®ºóÔÙ13ÄêµÄһƪÎÄÏ×£¬¾ßÌåÈçÏ£ºA solution of 2.5 ¡Á 10−4 M HAuCl4 was prepared in 0.1 M aqueous CTAB in a 50 mL centrifuge tube. NaBH4 (600 ¦ÌL, of a 10 mM stock solution) was added to the gold/CTAB solution (10 mL) with vigorous stirring for 10 min with the help of a stir bar. The resulting seed particles (¡«3 nm diameter) were used for the synthesis of both short and long gold nanorods. For the short gold nanorods (aspect ratio 3.5), the following were added, in order, to a conical flask: CTAB solution (95 mL of a 0.1 M stock solution), silver nitrate solution (1 mL of a 10 mM stock solution), and HAuCl4 (5 mL of a 10 mM stock solution). An aqueous solution of ascorbic acid (0.55 mL of a 0.1 M stock solution) was then added with gentle mixing. Finally, the gold seed solution (0.12 mL) was added and mixed. The solution was left undisturbed overnight. The colored gold nanorod solution was purified by centrifugation (2¡Á) to remove excess CTAB. The method yielded gold nanorods of length 54.0 ¡À 2.1 nm and width 15.9 ¡À 1.1 nm¡£
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