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songjuan322

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     ×î½üÔںϳɽðÄÉÃ×°ô£¬µ«ÊÇ×öÁ˺ܶà´ÎÊÔÑ飬µÃµ½µÄ½ðÄÉÃ×°ô¶¼ÊÇ×ÏÉ«»òÕ߯«À¶É«µÄ£¬ÎüÊÕ²¨³¤ÔÚ600-700 nm´¦£¬NaBH4 ºÍ¿¹»µÑªËá¶¼ÊÇÐÂÅäÖõÄÈÜÒº
²Î¿¼ÎÄÏס°Improved Size-Tunable Synthesis of Monodisperse Gold Nanorods through the Use of Aromatic Additives¡± Christopher B. Murray*
Synthesis of Gold NRs.
The seed solution for gold NRs was prepared as reported previously. A 5 mL amount of 0.5 mM HAuCl4 was mixed with 5 mL of 0.2 M CTAB solution. A 0.6 mL portion of fresh 0.01 M NaBH4 was diluted to 1 mL with water and was then injected into the Au(III)CTAB solution under vigorous stirring (1200 rpm). The solution color changed from yellow to brownish-yellow, and the stirring was stopped after 2 min. The seed solution was aged at room temperature for
30 min before use. £¨Õⲿ»¹Ô­¼ÁÊÇ¿ìËÙ¼ÓÈëµÄ£¬´óÁ¦ÔÈËÙ½Á°è£¬ÖÖ×ÓÒºÊDzèÉ«µÄ£©

To prepare the growth solution,
9.0 g of CTAB together with defined amounts of additives (Table S1)£¨ÕâÀïÎÒÓõÄÊÇ1.1g 5-äåË®ÑîËᣩ were dissolved in 250 mL of warm water (50£­70 ¶È, depending on the additive) in a 500 mL Erlenmeyer flask. The solution was allowed to cool to 30 C, when a 4 mM AgNO3 solution, as detailed in Table S1£¨12 mL£©, was added. The mixture was kept undisturbed at 30 C for15 min, after which 250 mL of 1 mM HAuCl4 solution and, if necessary, a small amount of HCl (37 wt % in water, 12.1 M) was added. (ÕⲿûÓмӣ¬ÒòΪ¸ù¾ÝÎÄÏ×ÖÐËù˵£¬ÎÒÐèÒªµÄ¿ÅÁ£Ð¡ÓÚ850nm,²»ÐèÒª¼Ó)¡£ After 15 min of slow stirring (400 rpm), 0.064 M ascorbic acid (Table S1) £¨2 mL£©was added, and the solution was vigorously stirred for 30 s until it became colorless. The growth solution had a CTAB concentration of about 0.05 M and was used right after preparation. Finally, 0.8 mL of seed solution was injected into the growth solution. The resultant mixture was stirred for 30 s and left undisturbed at 30 C for 12 h for NR growth. The reaction products were isolated by centrifugation at 8500 rpm for 25 min followed by removal of the supernatant. The precipitates were redispersed in 10 mL of water.

²»ÖªµÀÄÄÀï³öÁËÎÊÌ⣬ÎÒÏëºÏ³ÉµÄÊÇ800nm×óÓҵģ¬
¶à´ÎÖØ¸´ÊÔÑé¾ùÊÇÕâ¸ö½á¹û£¬ºóÃæµ÷´óÏõËáÒøµÄŨ¶È£¬ºÏ³É³öÀ´µÄ»¹ÊÇ×ÏÉ«µÄ£¬²»ÖªµÀÄÄÀï³öÁËÎÊÌâ¡£

ÁíÍâÎÒ°´ÕÕ El-Sayed* ¡°Preparation and Growth Mechanism of Gold Nanorods (NRs) Using Seed-Mediated Growth Method¡±Öеķ½·¨ºÏ³É£¬
¡°Growth of NRs with Plasmon Bands Less Than 850 nm.
CTAB (5 mL, 0.20 M) was added to (0.050, 0.10, 0.15, 0.20, 0.25 mL) (¸ù¾ÝÎÒµÄÁ£¾¶ÒªÇó£¬ÕâÀïÑ¡ÔñµÄÊÇ0.2.ml) of 0.0040 M AgNO3 solution at 25 ¡ãC. To this solution, 5.0 mL of 0.0010 M HAuCl4 was added, and after gentle mixing of the solution 70 ¦ÌL of 0.0788 M ascorbic acid was added. Ascorbic acid as a mild reducing agent changes the growth solution from dark yellow to colorless. It is worth noting that the five growth solutions above are identical except for their silver ion content. The final step was the addition of 12 ¦ÌL of the seed solution to the growth solution at 27-30 ¡ãC. The color of the solution gradually changed within 10-20 min. For longer NRs, the color change takes place more slowly. The temperature of the growth medium was kept constant at 27-30 ¡ãC in all the experiments. This pathway produces pure NR solutions with aspect ratios up to 4.7.¡±
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