Citation: Hongpeng He, Mengmeng Zhang, Mengjiao Hao, Wei Du, Haibing Xia. Synthesis of Different Aspect-Ratios of Fixed Width Gold Nanorods[J]. Acta Physico-Chimica Sinica, ;2024, 40(5): 230404. doi: 10.3866/PKU.WHXB202304043 shu

Synthesis of Different Aspect-Ratios of Fixed Width Gold Nanorods

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

Corresponding author: Wei Du, duwei@ytu.edu.cn Haibing Xia, hbxia@sdu.edu.cn
Received Date: 24 April 2023
Revised Date: 17 May 2023
Accepted Date: 18 May 2023
Available Online: 29 May 2023
Fund Project: the National Natural Science Foundation of China 22072076the National Natural Science Foundation of China 21773142the Taishan Scholarship in Shandong Province tstp20221106

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 FW^6.5-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.
- Gold nanorods,
- Lauryl alcohol,
- Fixed width,
- Symmetry-breaking efficiency,
- Effective particle number
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