Synthesis of Uniform Gold Nanorods with Large Width to Realize Ultralow SERS Detection,Chemistry - A European Journal

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Synthesis of Uniform Gold Nanorods with Large Width to Realize Ultralow SERS Detection
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2021-03-26 , DOI: 10.1002/chem.202005422
Hongpeng He ₁ , Chenshuo Wu ₂ , Cuixia Bi ₂ , Yahui Song ₃ , Dayang Wang ₄ , Haibing Xia ₅

Affiliation

In this work, we successfully demonstrate high‐yield synthesis of high‐quality gold nanorods (Au NRs) with width ranging from 6.5 nm to 175 nm by introducing heptanol molecules as secondary templating agents during cetyltrimethylammonium bromide‐templated, seeded growth method. The results show that an appropriate concentration of heptanol molecules not only alter the micellization behavior of CTAB in water, but also help silver ions impact the symmetry‐breaking efficiency of additional Au−NP seeds in addition to enhancing the utilization of gold precursors. Moreover, the generality and versatility of the present strategy for synthesis of Au NRs with flexible controlled dimensions are further demonstrated by successful synthesis of Au NRs with the assistance of other fatty alcohols with properly long alkyl chains. Furthermore, when arrays of vertically aligned Au NRs with large width (AVA−Au_120×90 NRs) are used as SERS substrates, they can achieve the ultralow limit of detection for crystal violet (10⁻¹⁶ M) with good reliability and reproducibility, and the rapid detection and identification of residual harmful substances.

中文翻译：

大宽度均匀金纳米棒的合成以实现超低SERS检测

在这项工作中，我们成功地证明了高纯度合成的金纳米棒（Au NR）的宽度，该金纳米棒的宽度为6.5 nm至175 nm，方法是在十六烷基三甲基溴化铵为模板的种子生长方法中引入庚醇分子作为辅助模板剂。结果表明，适当浓度的庚醇分子不仅可以改变水中CTAB的胶束行为，而且还可以帮助银离子影响其他Au-NP种子的对称破坏效率，同时还可以提高金前体的利用率。此外，通过在具有适当长的烷基链的其他脂肪醇的帮助下成功合成Au NR，进一步证明了本发明的具有灵活受控尺寸的Au NR的合成策略的通用性和多功能性。此外，_120×90 NRs）用作SERS底物，它们可以实现对结晶紫（10 ^-16 M）的超低检测限，具有良好的可靠性和可重复性，并且可以快速检测和识别残留的有害物质。

更新日期：2021-05-12

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