State Key Laboratory of Crystal Materials, Shandong University, No. 27 Shanda South Road, Jinan, 250100, P. R. China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Chemistry. 2021 May 12;27(27):7549-7560. doi: 10.1002/chem.202005422. Epub 2021 Apr 14.
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 NRs) are used as SERS substrates, they can achieve the ultralow limit of detection for crystal violet (10 M) with good reliability and reproducibility, and the rapid detection and identification of residual harmful substances.
在这项工作中，我们通过在十六烷基三甲基溴化铵（CTAB）模板、种子生长法中引入庚醇分子作为二级模板剂，成功地展示了高产率合成宽度从 6.5nm 到 175nm 的高质量金纳米棒（Au NRs）。结果表明，适量浓度的庚醇分子不仅改变了 CTAB 在水中的胶束化行为，而且有助于银离子提高外加 Au-NP 种子的对称破缺效率，同时提高了金前体的利用率。此外，通过使用其他具有适当长烷基链的脂肪醇成功合成 Au NRs，进一步证明了本策略用于合成具有灵活可控尺寸的 Au NRs 的通用性和多功能性。此外，当用作 SERS 基底的垂直排列 Au NRs 阵列（AVA-Au NRs）具有较大宽度时，它们可以实现结晶紫（10^-10 M）的超低检测限，具有良好的可靠性和重现性，并且可以快速检测和识别残留有害物质。
