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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synthesis of Au Nanorods through Prereduction with Curcumin: Preferential Enhancement of Au Nanorod Formation Prepared from CTAB-Capped over Citrate-Capped Au Seeds
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Synthesis of Au Nanorods through Prereduction with Curcumin: Preferential Enhancement of Au Nanorod Formation Prepared from CTAB-Capped over Citrate-Capped Au Seeds

机译：通过姜黄素的预还原合成金纳米棒：由柠檬酸盐覆盖的金种子上CTAB覆盖的金纳米棒形成的优先增强

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摘要

Despite seed-mediated growth approach being the state of art method for synthesis of gold nanorods, the mechanism of gold nanorod formation to control final aspect ratio of the nanorods is not yet well understood. In this work, formation of Au nanorods has been investigated using curcumin, a hydrophobic molecule, as secondary reducing agent, instead of popularly used hydrophilic ascorbic acid. It is found that the nature of the secondary reducing agent plays a crucial role in preferential enhancement of Au nanorod formation. Although in the seed-mediated growth approach the concentration of curcumin has similar effect on Au nanorod formation as observed for ascorbic acid earlier, the combination of the nature of the capping agent of seed particles as well as that of the secondary reducing agent determines the final aspect ratio of the nanorods. Hydrophobic (secondary) reducing agent, curcumin, prefers CTAB capped seed solution compared with citrate capped seed solution. The mechanism of nanorod formation has been explored. AgNO3 is known to enhance the aspect ratio of the nanorod formation when the ascorbic acid and citrate capped seed method is used; however, in contrast when curcumin is used, AgNO3 encourages nanorod formation for only CTAB capped seed solution but discourages nanorod formation for citrate capped seed solution. A mechanism has been suggested for this discrepancy. Present results help to gain more understanding of the formation process by bringing new insight in the mechanism of Au nanorod formation through seed-mediated growth approach, which may trigger better design of nanomaterials.
机译：尽管种子介导的生长方法是合成金纳米棒的最先进的方法，但对于控制纳米棒的最终长径比的金纳米棒形成的机理尚未充分了解。在这项工作中，已经使用疏水性分子姜黄素作为第二还原剂，而不是普遍使用的亲水性抗坏血酸，研究了金纳米棒的形成。发现第二还原剂的性质在优先增强Au纳米棒形成中起关键作用。尽管在种子介导的生长方法中，姜黄素的浓度对金纳米棒的形成具有与早期抗坏血酸相似的作用，但种子颗粒的封端剂和辅助还原剂的性质共同决定了最终纳米棒的长宽比。疏水（次要）还原剂姜黄素比柠檬酸盐加帽的种子溶液更喜欢CTAB加帽的种子溶液。已经探索了纳米棒形成的机理。当使用抗坏血酸和柠檬酸盐加帽的种子法时，AgNO3可以提高纳米棒形成的长径比。但是，相比之下，当使用姜黄素时，AgNO3仅对加有CTAB的种子溶液促进纳米棒形成，而对柠檬酸盐加有种子的溶液则不利于纳米棒形成。已经提出了一种针对这种差异的机制。目前的结果有助于通过种子介导的生长方法对金纳米棒的形成机理提供新见解，从而有助于更好地理解形成过程，这可能会触发纳米材料的更好设计。

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