物理化学学报 >> 2024, Vol. 40 >> Issue (5): 2304043.doi: 10.3866/PKU.WHXB202304043

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不同长径比的具有固定宽度金纳米棒的合成

贺鸿鹏1, 张萌萌1, 郝梦娇1, 杜伟2,*(), 夏海兵1,*()   

  1. 1 山东大学晶体材料国家重点实验室, 济南 250100
    2 烟台大学环境与材料工程学院, 山东 烟台 264005
  • 收稿日期:2023-04-24 修回日期:2023-05-17 录用日期:2023-05-18 发布日期:2023-05-29
  • 通讯作者: Email: hbxia@sdu.edu.cn; Tel.: +86-15106996156 (夏海兵)duwei@ytu.edu.cn (杜伟)
  • 基金资助:
    国家自然科学基金(22072076); 国家自然科学基金(21773142); 山东省泰山学者(tstp20221106); 山东大学基础研究基金资助项目

Synthesis of Different Aspect-Ratios of Fixed Width Gold Nanorods

Hongpeng He1, Mengmeng Zhang1, Mengjiao Hao1, Wei Du2,*(), Haibing Xia1,*()   

  1. 1 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
    2 School of Environment and Material Engineering, Yantai University, Yantai 264005, Shandong Province, China
  • Received:2023-04-24 Revised:2023-05-17 Accepted:2023-05-18 Published:2023-05-29
  • Contact: Email: hbxia@sdu.edu.cn; Tel.: +86-15106996156 (Haibing Xia)duwei@ytu.edu.cn (Wei Du)
  • Supported by:
    the National Natural Science Foundation of China(22072076); the National Natural Science Foundation of China(21773142); the Taishan Scholarship in Shandong Province(tstp20221106); the Fundamental Research Fund of Shandong University

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摘要：

金纳米棒在光学、电学、信息学和生物医学等领域具有广泛的应用。然而，一些具有特殊要求的金纳米棒还不能通过常规的方法制备。在本研究中，我们创新地将十二醇(LA)分子引入到传统种子生长方法中，成功实现了具有固定宽度的不同长径比(AR)金纳米棒(FW-Au NR)的按需制备。此外，通过合理地选择相应的反应条件(如氯金酸和硝酸银的浓度)，可以在130–38.4，109–26.4和16–46 nm范围之间分别调节FW23-Au NRs，FW14-Au NRs和FW6.5-Au NRs (右上角的标注数字表示金纳米棒的宽度)的长度。即，可在一个较大的长度范围内调节具有固定宽度的金纳米棒的长径比。并且，在合适浓度的十二醇，0.24–0.30 mmol∙L−1范围内调节硝酸银浓度，可以使这些金纳米棒的宽度固定在6.5–23 nm之间。另外，实现FW-Au NRs制备的关键是银离子和十二醇分子对分布在金种子晶面上的CTA-Br-Ag+化合物的密度的协同影响。

关键词: 金纳米棒, 十二醇, 固定的宽度, 对称性打破效率, 有效颗粒数

Abstract:

Gold nanorods (Au NRs) have been widely used in the optics, electricity, informatics, and biomedical fields in recent years. However, Au NRs with specialized requirements cannot be prepared by conventional methods. For instance, in photothermal therapy, Au NRs with high aspect ratios (ARs) are desirable for increasing tissue penetration and reducing the burning of human skin during treatment. However, when their ARs were adjusted to match the laser used in second near-infrared windows (NIR-II), the length and width of the Au NRs simultaneously increased. This increase in width reduces its photothermal conversion efficiency. Unfortunately, tuning the ARs of Au NRs at a fixed width requires complex procedures. In this study, we developed a new seeded-growth method to synthesize different ARs of fixed width Au NRs (FW-Au NRs). To the best of our knowledge, this is the first study to adjust the length of FW-Au NRs by introducing lauryl alcohol (LA) molecules into the traditional seeded growth method. Moreover, the length span of FW23-Au, FW14-Au, and FW6.5-Au NRs (the superscript numbers denote the width of Au NRs in nm) was adjusted between 130 and 38.4 nm, 109 and 26.4 nm, and 16 and 46 nm, respectively, by judiciously selecting the corresponding reaction conditions. Notably, the lengths of the Au NRs can be readily achieved at a fixed width over a wide range. In addition, their ARs were tuned at a fixed width by adjusting only their length, instead of simultaneously varying their length and width. In addition, their widths were maintained between 6.5 and 23 nm by adjusting [AgNO3] between 0.24 and 0.30 mmol∙L−1 in the presence of LA. Furthermore, the synergetic effect of Ag+ and LA on the density of the cetyltrimethylammonium (CTA)-Br-Ag+ complexes distributed on the facets of added Au-NP seeds, which can impact their symmetry-breaking efficiency (SBE) and the particle number of Au-NP seeds that grow into final Au NRs, is key to the synthesis of FW-Au NRs. The results of this study offer a flexible and reliable method to tune the length of Au NRs with a fixed width and pave the way for achieving an on-demand synthesis of Au NRs, especially for cancer photothermal therapy.

Key words: Gold nanorods, Lauryl alcohol, Fixed width, Symmetry-breaking efficiency, Effective particle number