...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Critical concentrations and role of ascorbic acid (vitamin C) in the crystallization of gold nanorods within hexadecyltrimethyl ammonium bromide (CTAB)/tetraoctyl ammonium bromide (TOAB) micelles
【24h】

Critical concentrations and role of ascorbic acid (vitamin C) in the crystallization of gold nanorods within hexadecyltrimethyl ammonium bromide (CTAB)/tetraoctyl ammonium bromide (TOAB) micelles

机译：十六烷基三甲基溴化铵（CTAB）/四辛基溴化铵（TOAB）胶束中金纳米棒中抗坏血酸（维生素C）的临界浓度和作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Growth of gold nanorods is investigated in the presence of ascorbic acid in an aqueous mixed micelle solution of hexadecyltrimethyl ammonium bromide (CTAB) and tetraoctyl ammonium bromide (TOAB) through photochemical reduction of HAuCl4 center dot 3H(2)O using 300 nm Hg lamps. The role of the ascorbic acid concentration, [H(2)A], in the formation of gold nanorods was studied using UV-vis absorption and transmission electron microscopy. Gold nanorods were produced only if [H(2)A]/[Au3+] >= 0.75 in the reaction cell. For 0.75 < [H(2)A]/[Au3+] < 6.2, the aspect ratio of nanorods increased as [H(2)A] increased. For [H(2)A]/[Au3+] > 6.2, the aspect ratio decreased, and shorter nanorods formed as [H(2)A] increased. These results are indicative of a lower and upper limit in the concentrations of ascorbic acid and its conjugate base ( ascorbate anion) for the formation of gold nanorods. The roles of ascorbic acid and ascorbate ions are discussed, and these observations support the existence of soft templates formed by CTAB/ TOAB micelles where Au nanorods grow. Evidence for parallel nucleation and growth processes is also presented.
机译：通过使用300 nm汞灯对HAuCl4中心点3H（2）O进行光化学还原，在抗坏血酸存在下的十六烷基三甲基溴化铵（CTAB）和四辛基溴化铵（TOAB）混合胶束水溶液中研究了金纳米棒的生长。使用紫外可见吸收和透射电子显微镜研究了抗坏血酸浓度[H（2）A]在金纳米棒形成中的作用。仅当[H（2）A] / [Au3 +]> = 0.75时才生成金纳米棒。对于0.75 <[H（2）A] / [Au3 +] <6.2，纳米棒的纵横比随[H（2）A]的增加而增加。当[H（2）A] / [Au3 +]> 6.2时，长径比降低，并且随着[H（2）A]的增加而形成的纳米棒越短。这些结果表明用于形成金纳米棒的抗坏血酸及其共轭碱（抗坏血酸阴离子）的浓度的上限和下限。讨论了抗坏血酸和抗坏血酸离子的作用，这些观察结果支持由CTAB / TOAB胶束在金纳米棒生长的地方形成的软模板的存在。还提供了平行成核和生长过程的证据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号